X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fsimplify-rtx.c;h=b38ab2e59912dce35e7d45e2f9754c8607ac34ab;hb=40e175e78b8bfcaf6afa0f75e705d62f752cc3e9;hp=657b2b59c23f7df0c842c23d1d308b583ba030f9;hpb=f2e0dda3066e3d34f0c5424885bf4b1e5591fd81;p=pf3gnuchains%2Fgcc-fork.git
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index 657b2b59c23..b38ab2e5991 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -1,12 +1,13 @@
/* RTL simplification functions for GNU compiler.
Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+ Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
@@ -15,9 +16,8 @@ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+. */
#include "config.h"
@@ -30,7 +30,6 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
#include "regs.h"
#include "hard-reg-set.h"
#include "flags.h"
-#include "real.h"
#include "insn-config.h"
#include "recog.h"
#include "function.h"
@@ -49,11 +48,10 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
#define HWI_SIGN_EXTEND(low) \
((((HOST_WIDE_INT) low) < 0) ? ((HOST_WIDE_INT) -1) : ((HOST_WIDE_INT) 0))
-static rtx neg_const_int (enum machine_mode, rtx);
-static bool plus_minus_operand_p (rtx);
-static int simplify_plus_minus_op_data_cmp (const void *, const void *);
-static rtx simplify_plus_minus (enum rtx_code, enum machine_mode, rtx,
- rtx, int);
+static rtx neg_const_int (enum machine_mode, const_rtx);
+static bool plus_minus_operand_p (const_rtx);
+static bool simplify_plus_minus_op_data_cmp (rtx, rtx);
+static rtx simplify_plus_minus (enum rtx_code, enum machine_mode, rtx, rtx);
static rtx simplify_immed_subreg (enum machine_mode, rtx, enum machine_mode,
unsigned int);
static rtx simplify_associative_operation (enum rtx_code, enum machine_mode,
@@ -67,7 +65,7 @@ static rtx simplify_binary_operation_1 (enum rtx_code, enum machine_mode,
/* Negate a CONST_INT rtx, truncating (because a conversion from a
maximally negative number can overflow). */
static rtx
-neg_const_int (enum machine_mode mode, rtx i)
+neg_const_int (enum machine_mode mode, const_rtx i)
{
return gen_int_mode (- INTVAL (i), mode);
}
@@ -76,7 +74,7 @@ neg_const_int (enum machine_mode mode, rtx i)
the most significant bit of machine mode MODE. */
bool
-mode_signbit_p (enum machine_mode mode, rtx x)
+mode_signbit_p (enum machine_mode mode, const_rtx x)
{
unsigned HOST_WIDE_INT val;
unsigned int width;
@@ -87,9 +85,9 @@ mode_signbit_p (enum machine_mode mode, rtx x)
width = GET_MODE_BITSIZE (mode);
if (width == 0)
return false;
-
+
if (width <= HOST_BITS_PER_WIDE_INT
- && GET_CODE (x) == CONST_INT)
+ && CONST_INT_P (x))
val = INTVAL (x);
else if (width <= 2 * HOST_BITS_PER_WIDE_INT
&& GET_CODE (x) == CONST_DOUBLE
@@ -115,25 +113,15 @@ simplify_gen_binary (enum rtx_code code, enum machine_mode mode, rtx op0,
{
rtx tem;
- /* Put complex operands first and constants second if commutative. */
- if (GET_RTX_CLASS (code) == RTX_COMM_ARITH
- && swap_commutative_operands_p (op0, op1))
- tem = op0, op0 = op1, op1 = tem;
-
/* If this simplifies, do it. */
tem = simplify_binary_operation (code, mode, op0, op1);
if (tem)
return tem;
- /* Handle addition and subtraction specially. Otherwise, just form
- the operation. */
-
- if (code == PLUS || code == MINUS)
- {
- tem = simplify_plus_minus (code, mode, op0, op1, 1);
- if (tem)
- return tem;
- }
+ /* Put complex operands first and constants second if commutative. */
+ if (GET_RTX_CLASS (code) == RTX_COMM_ARITH
+ && swap_commutative_operands_p (op0, op1))
+ tem = op0, op0 = op1, op1 = tem;
return gen_rtx_fmt_ee (code, mode, op0, op1);
}
@@ -169,6 +157,9 @@ avoid_constant_pool_reference (rtx x)
return x;
}
+ if (GET_MODE (x) == BLKmode)
+ return x;
+
addr = XEXP (x, 0);
/* Call target hook to avoid the effects of -fpic etc.... */
@@ -177,7 +168,7 @@ avoid_constant_pool_reference (rtx x)
/* Split the address into a base and integer offset. */
if (GET_CODE (addr) == CONST
&& GET_CODE (XEXP (addr, 0)) == PLUS
- && GET_CODE (XEXP (XEXP (addr, 0), 1)) == CONST_INT)
+ && CONST_INT_P (XEXP (XEXP (addr, 0), 1)))
{
offset = INTVAL (XEXP (XEXP (addr, 0), 1));
addr = XEXP (XEXP (addr, 0), 0);
@@ -209,13 +200,105 @@ avoid_constant_pool_reference (rtx x)
return x;
}
+
+/* Simplify a MEM based on its attributes. This is the default
+ delegitimize_address target hook, and it's recommended that every
+ overrider call it. */
-/* Return true if X is a MEM referencing the constant pool. */
-
-bool
-constant_pool_reference_p (rtx x)
+rtx
+delegitimize_mem_from_attrs (rtx x)
{
- return avoid_constant_pool_reference (x) != x;
+ if (MEM_P (x)
+ && MEM_EXPR (x)
+ && (!MEM_OFFSET (x)
+ || GET_CODE (MEM_OFFSET (x)) == CONST_INT))
+ {
+ tree decl = MEM_EXPR (x);
+ enum machine_mode mode = GET_MODE (x);
+ HOST_WIDE_INT offset = 0;
+
+ switch (TREE_CODE (decl))
+ {
+ default:
+ decl = NULL;
+ break;
+
+ case VAR_DECL:
+ break;
+
+ case ARRAY_REF:
+ case ARRAY_RANGE_REF:
+ case COMPONENT_REF:
+ case BIT_FIELD_REF:
+ case REALPART_EXPR:
+ case IMAGPART_EXPR:
+ case VIEW_CONVERT_EXPR:
+ {
+ HOST_WIDE_INT bitsize, bitpos;
+ tree toffset;
+ int unsignedp = 0, volatilep = 0;
+
+ decl = get_inner_reference (decl, &bitsize, &bitpos, &toffset,
+ &mode, &unsignedp, &volatilep, false);
+ if (bitsize != GET_MODE_BITSIZE (mode)
+ || (bitpos % BITS_PER_UNIT)
+ || (toffset && !host_integerp (toffset, 0)))
+ decl = NULL;
+ else
+ {
+ offset += bitpos / BITS_PER_UNIT;
+ if (toffset)
+ offset += TREE_INT_CST_LOW (toffset);
+ }
+ break;
+ }
+ }
+
+ if (decl
+ && mode == GET_MODE (x)
+ && TREE_CODE (decl) == VAR_DECL
+ && (TREE_STATIC (decl)
+ || DECL_THREAD_LOCAL_P (decl))
+ && DECL_RTL_SET_P (decl)
+ && MEM_P (DECL_RTL (decl)))
+ {
+ rtx newx;
+
+ if (MEM_OFFSET (x))
+ offset += INTVAL (MEM_OFFSET (x));
+
+ newx = DECL_RTL (decl);
+
+ if (MEM_P (newx))
+ {
+ rtx n = XEXP (newx, 0), o = XEXP (x, 0);
+
+ /* Avoid creating a new MEM needlessly if we already had
+ the same address. We do if there's no OFFSET and the
+ old address X is identical to NEWX, or if X is of the
+ form (plus NEWX OFFSET), or the NEWX is of the form
+ (plus Y (const_int Z)) and X is that with the offset
+ added: (plus Y (const_int Z+OFFSET)). */
+ if (!((offset == 0
+ || (GET_CODE (o) == PLUS
+ && GET_CODE (XEXP (o, 1)) == CONST_INT
+ && (offset == INTVAL (XEXP (o, 1))
+ || (GET_CODE (n) == PLUS
+ && GET_CODE (XEXP (n, 1)) == CONST_INT
+ && (INTVAL (XEXP (n, 1)) + offset
+ == INTVAL (XEXP (o, 1)))
+ && (n = XEXP (n, 0))))
+ && (o = XEXP (o, 0))))
+ && rtx_equal_p (o, n)))
+ x = adjust_address_nv (newx, mode, offset);
+ }
+ else if (GET_MODE (x) == GET_MODE (newx)
+ && offset == 0)
+ x = newx;
+ }
+ }
+
+ return x;
}
/* Make a unary operation by first seeing if it folds and otherwise making
@@ -266,38 +349,46 @@ simplify_gen_relational (enum rtx_code code, enum machine_mode mode,
return gen_rtx_fmt_ee (code, mode, op0, op1);
}
-/* Replace all occurrences of OLD_RTX in X with NEW_RTX and try to simplify the
- resulting RTX. Return a new RTX which is as simplified as possible. */
+/* If FN is NULL, replace all occurrences of OLD_RTX in X with copy_rtx (DATA)
+ and simplify the result. If FN is non-NULL, call this callback on each
+ X, if it returns non-NULL, replace X with its return value and simplify the
+ result. */
rtx
-simplify_replace_rtx (rtx x, rtx old_rtx, rtx new_rtx)
+simplify_replace_fn_rtx (rtx x, const_rtx old_rtx,
+ rtx (*fn) (rtx, const_rtx, void *), void *data)
{
enum rtx_code code = GET_CODE (x);
enum machine_mode mode = GET_MODE (x);
enum machine_mode op_mode;
- rtx op0, op1, op2;
-
- /* If X is OLD_RTX, return NEW_RTX. Otherwise, if this is an expression, try
- to build a new expression substituting recursively. If we can't do
- anything, return our input. */
+ const char *fmt;
+ rtx op0, op1, op2, newx, op;
+ rtvec vec, newvec;
+ int i, j;
- if (x == old_rtx)
- return new_rtx;
+ if (__builtin_expect (fn != NULL, 0))
+ {
+ newx = fn (x, old_rtx, data);
+ if (newx)
+ return newx;
+ }
+ else if (rtx_equal_p (x, old_rtx))
+ return copy_rtx ((rtx) data);
switch (GET_RTX_CLASS (code))
{
case RTX_UNARY:
op0 = XEXP (x, 0);
op_mode = GET_MODE (op0);
- op0 = simplify_replace_rtx (op0, old_rtx, new_rtx);
+ op0 = simplify_replace_fn_rtx (op0, old_rtx, fn, data);
if (op0 == XEXP (x, 0))
return x;
return simplify_gen_unary (code, mode, op0, op_mode);
case RTX_BIN_ARITH:
case RTX_COMM_ARITH:
- op0 = simplify_replace_rtx (XEXP (x, 0), old_rtx, new_rtx);
- op1 = simplify_replace_rtx (XEXP (x, 1), old_rtx, new_rtx);
+ op0 = simplify_replace_fn_rtx (XEXP (x, 0), old_rtx, fn, data);
+ op1 = simplify_replace_fn_rtx (XEXP (x, 1), old_rtx, fn, data);
if (op0 == XEXP (x, 0) && op1 == XEXP (x, 1))
return x;
return simplify_gen_binary (code, mode, op0, op1);
@@ -307,8 +398,8 @@ simplify_replace_rtx (rtx x, rtx old_rtx, rtx new_rtx)
op0 = XEXP (x, 0);
op1 = XEXP (x, 1);
op_mode = GET_MODE (op0) != VOIDmode ? GET_MODE (op0) : GET_MODE (op1);
- op0 = simplify_replace_rtx (op0, old_rtx, new_rtx);
- op1 = simplify_replace_rtx (op1, old_rtx, new_rtx);
+ op0 = simplify_replace_fn_rtx (op0, old_rtx, fn, data);
+ op1 = simplify_replace_fn_rtx (op1, old_rtx, fn, data);
if (op0 == XEXP (x, 0) && op1 == XEXP (x, 1))
return x;
return simplify_gen_relational (code, mode, op_mode, op0, op1);
@@ -317,9 +408,9 @@ simplify_replace_rtx (rtx x, rtx old_rtx, rtx new_rtx)
case RTX_BITFIELD_OPS:
op0 = XEXP (x, 0);
op_mode = GET_MODE (op0);
- op0 = simplify_replace_rtx (op0, old_rtx, new_rtx);
- op1 = simplify_replace_rtx (XEXP (x, 1), old_rtx, new_rtx);
- op2 = simplify_replace_rtx (XEXP (x, 2), old_rtx, new_rtx);
+ op0 = simplify_replace_fn_rtx (op0, old_rtx, fn, data);
+ op1 = simplify_replace_fn_rtx (XEXP (x, 1), old_rtx, fn, data);
+ op2 = simplify_replace_fn_rtx (XEXP (x, 2), old_rtx, fn, data);
if (op0 == XEXP (x, 0) && op1 == XEXP (x, 1) && op2 == XEXP (x, 2))
return x;
if (op_mode == VOIDmode)
@@ -327,10 +418,9 @@ simplify_replace_rtx (rtx x, rtx old_rtx, rtx new_rtx)
return simplify_gen_ternary (code, mode, op_mode, op0, op1, op2);
case RTX_EXTRA:
- /* The only case we try to handle is a SUBREG. */
if (code == SUBREG)
{
- op0 = simplify_replace_rtx (SUBREG_REG (x), old_rtx, new_rtx);
+ op0 = simplify_replace_fn_rtx (SUBREG_REG (x), old_rtx, fn, data);
if (op0 == SUBREG_REG (x))
return x;
op0 = simplify_gen_subreg (GET_MODE (x), op0,
@@ -343,15 +433,15 @@ simplify_replace_rtx (rtx x, rtx old_rtx, rtx new_rtx)
case RTX_OBJ:
if (code == MEM)
{
- op0 = simplify_replace_rtx (XEXP (x, 0), old_rtx, new_rtx);
+ op0 = simplify_replace_fn_rtx (XEXP (x, 0), old_rtx, fn, data);
if (op0 == XEXP (x, 0))
return x;
return replace_equiv_address_nv (x, op0);
}
else if (code == LO_SUM)
{
- op0 = simplify_replace_rtx (XEXP (x, 0), old_rtx, new_rtx);
- op1 = simplify_replace_rtx (XEXP (x, 1), old_rtx, new_rtx);
+ op0 = simplify_replace_fn_rtx (XEXP (x, 0), old_rtx, fn, data);
+ op1 = simplify_replace_fn_rtx (XEXP (x, 1), old_rtx, fn, data);
/* (lo_sum (high x) x) -> x */
if (GET_CODE (op0) == HIGH && rtx_equal_p (XEXP (op0, 0), op1))
@@ -361,17 +451,61 @@ simplify_replace_rtx (rtx x, rtx old_rtx, rtx new_rtx)
return x;
return gen_rtx_LO_SUM (mode, op0, op1);
}
- else if (code == REG)
- {
- if (rtx_equal_p (x, old_rtx))
- return new_rtx;
- }
break;
default:
break;
}
- return x;
+
+ newx = x;
+ fmt = GET_RTX_FORMAT (code);
+ for (i = 0; fmt[i]; i++)
+ switch (fmt[i])
+ {
+ case 'E':
+ vec = XVEC (x, i);
+ newvec = XVEC (newx, i);
+ for (j = 0; j < GET_NUM_ELEM (vec); j++)
+ {
+ op = simplify_replace_fn_rtx (RTVEC_ELT (vec, j),
+ old_rtx, fn, data);
+ if (op != RTVEC_ELT (vec, j))
+ {
+ if (newvec == vec)
+ {
+ newvec = shallow_copy_rtvec (vec);
+ if (x == newx)
+ newx = shallow_copy_rtx (x);
+ XVEC (newx, i) = newvec;
+ }
+ RTVEC_ELT (newvec, j) = op;
+ }
+ }
+ break;
+
+ case 'e':
+ if (XEXP (x, i))
+ {
+ op = simplify_replace_fn_rtx (XEXP (x, i), old_rtx, fn, data);
+ if (op != XEXP (x, i))
+ {
+ if (x == newx)
+ newx = shallow_copy_rtx (x);
+ XEXP (newx, i) = op;
+ }
+ }
+ break;
+ }
+ return newx;
+}
+
+/* Replace all occurrences of OLD_RTX in X with NEW_RTX and try to simplify the
+ resulting RTX. Return a new RTX which is as simplified as possible. */
+
+rtx
+simplify_replace_rtx (rtx x, const_rtx old_rtx, rtx new_rtx)
+{
+ return simplify_replace_fn_rtx (x, old_rtx, 0, new_rtx);
}
/* Try to simplify a unary operation CODE whose output mode is to be
@@ -383,9 +517,6 @@ simplify_unary_operation (enum rtx_code code, enum machine_mode mode,
{
rtx trueop, tem;
- if (GET_CODE (op) == CONST)
- op = XEXP (op, 0);
-
trueop = avoid_constant_pool_reference (op);
tem = simplify_const_unary_operation (code, mode, trueop, op_mode);
@@ -410,7 +541,8 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
if (GET_CODE (op) == NOT)
return XEXP (op, 0);
- /* (not (eq X Y)) == (ne X Y), etc. */
+ /* (not (eq X Y)) == (ne X Y), etc. if BImode or the result of the
+ comparison is all ones. */
if (COMPARISON_P (op)
&& (mode == BImode || STORE_FLAG_VALUE == -1)
&& ((reversed = reversed_comparison_code (op, NULL_RTX)) != UNKNOWN))
@@ -428,14 +560,14 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
/* (not (xor X C)) for C constant is (xor X D) with D = ~C. */
if (GET_CODE (op) == XOR
- && GET_CODE (XEXP (op, 1)) == CONST_INT
+ && CONST_INT_P (XEXP (op, 1))
&& (temp = simplify_unary_operation (NOT, mode,
XEXP (op, 1), mode)) != 0)
return simplify_gen_binary (XOR, mode, XEXP (op, 0), temp);
/* (not (plus X C)) for signbit C is (xor X D) with D = ~C. */
if (GET_CODE (op) == PLUS
- && GET_CODE (XEXP (op, 1)) == CONST_INT
+ && CONST_INT_P (XEXP (op, 1))
&& mode_signbit_p (mode, XEXP (op, 1))
&& (temp = simplify_unary_operation (NOT, mode,
XEXP (op, 1), mode)) != 0)
@@ -454,25 +586,62 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
return simplify_gen_binary (ROTATE, mode, temp, XEXP (op, 1));
}
- /* If STORE_FLAG_VALUE is -1, (not (comparison X Y)) can be done
- by reversing the comparison code if valid. */
- if (STORE_FLAG_VALUE == -1
- && COMPARISON_P (op)
- && (reversed = reversed_comparison_code (op, NULL_RTX)) != UNKNOWN)
- return simplify_gen_relational (reversed, mode, VOIDmode,
- XEXP (op, 0), XEXP (op, 1));
-
/* (not (ashiftrt foo C)) where C is the number of bits in FOO
minus 1 is (ge foo (const_int 0)) if STORE_FLAG_VALUE is -1,
so we can perform the above simplification. */
-
+
if (STORE_FLAG_VALUE == -1
&& GET_CODE (op) == ASHIFTRT
- && GET_CODE (XEXP (op, 1)) == CONST_INT
+ && GET_CODE (XEXP (op, 1))
&& INTVAL (XEXP (op, 1)) == GET_MODE_BITSIZE (mode) - 1)
return simplify_gen_relational (GE, mode, VOIDmode,
XEXP (op, 0), const0_rtx);
+
+ if (GET_CODE (op) == SUBREG
+ && subreg_lowpart_p (op)
+ && (GET_MODE_SIZE (GET_MODE (op))
+ < GET_MODE_SIZE (GET_MODE (SUBREG_REG (op))))
+ && GET_CODE (SUBREG_REG (op)) == ASHIFT
+ && XEXP (SUBREG_REG (op), 0) == const1_rtx)
+ {
+ enum machine_mode inner_mode = GET_MODE (SUBREG_REG (op));
+ rtx x;
+
+ x = gen_rtx_ROTATE (inner_mode,
+ simplify_gen_unary (NOT, inner_mode, const1_rtx,
+ inner_mode),
+ XEXP (SUBREG_REG (op), 1));
+ return rtl_hooks.gen_lowpart_no_emit (mode, x);
+ }
+
+ /* Apply De Morgan's laws to reduce number of patterns for machines
+ with negating logical insns (and-not, nand, etc.). If result has
+ only one NOT, put it first, since that is how the patterns are
+ coded. */
+
+ if (GET_CODE (op) == IOR || GET_CODE (op) == AND)
+ {
+ rtx in1 = XEXP (op, 0), in2 = XEXP (op, 1);
+ enum machine_mode op_mode;
+
+ op_mode = GET_MODE (in1);
+ in1 = simplify_gen_unary (NOT, op_mode, in1, op_mode);
+
+ op_mode = GET_MODE (in2);
+ if (op_mode == VOIDmode)
+ op_mode = mode;
+ in2 = simplify_gen_unary (NOT, op_mode, in2, op_mode);
+
+ if (GET_CODE (in2) == NOT && GET_CODE (in1) != NOT)
+ {
+ rtx tem = in2;
+ in2 = in1; in1 = tem;
+ }
+
+ return gen_rtx_fmt_ee (GET_CODE (op) == IOR ? AND : IOR,
+ mode, in1, in2);
+ }
break;
case NEG:
@@ -484,11 +653,11 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
if (GET_CODE (op) == PLUS
&& XEXP (op, 1) == const1_rtx)
return simplify_gen_unary (NOT, mode, XEXP (op, 0), mode);
-
+
/* Similarly, (neg (not X)) is (plus X 1). */
if (GET_CODE (op) == NOT)
return plus_constant (XEXP (op, 0), 1);
-
+
/* (neg (minus X Y)) can become (minus Y X). This transformation
isn't safe for modes with signed zeros, since if X and Y are
both +0, (minus Y X) is the same as (minus X Y). If the
@@ -498,13 +667,13 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
&& !HONOR_SIGNED_ZEROS (mode)
&& !HONOR_SIGN_DEPENDENT_ROUNDING (mode))
return simplify_gen_binary (MINUS, mode, XEXP (op, 1), XEXP (op, 0));
-
+
if (GET_CODE (op) == PLUS
&& !HONOR_SIGNED_ZEROS (mode)
&& !HONOR_SIGN_DEPENDENT_ROUNDING (mode))
{
/* (neg (plus A C)) is simplified to (minus -C A). */
- if (GET_CODE (XEXP (op, 1)) == CONST_INT
+ if (CONST_INT_P (XEXP (op, 1))
|| GET_CODE (XEXP (op, 1)) == CONST_DOUBLE)
{
temp = simplify_unary_operation (NEG, mode, XEXP (op, 1), mode);
@@ -539,7 +708,7 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
/* (neg (ashiftrt X C)) can be replaced by (lshiftrt X C) when
C is equal to the width of MODE minus 1. */
if (GET_CODE (op) == ASHIFTRT
- && GET_CODE (XEXP (op, 1)) == CONST_INT
+ && CONST_INT_P (XEXP (op, 1))
&& INTVAL (XEXP (op, 1)) == GET_MODE_BITSIZE (mode) - 1)
return simplify_gen_binary (LSHIFTRT, mode,
XEXP (op, 0), XEXP (op, 1));
@@ -547,11 +716,276 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
/* (neg (lshiftrt X C)) can be replaced by (ashiftrt X C) when
C is equal to the width of MODE minus 1. */
if (GET_CODE (op) == LSHIFTRT
- && GET_CODE (XEXP (op, 1)) == CONST_INT
+ && CONST_INT_P (XEXP (op, 1))
&& INTVAL (XEXP (op, 1)) == GET_MODE_BITSIZE (mode) - 1)
return simplify_gen_binary (ASHIFTRT, mode,
XEXP (op, 0), XEXP (op, 1));
-
+
+ /* (neg (xor A 1)) is (plus A -1) if A is known to be either 0 or 1. */
+ if (GET_CODE (op) == XOR
+ && XEXP (op, 1) == const1_rtx
+ && nonzero_bits (XEXP (op, 0), mode) == 1)
+ return plus_constant (XEXP (op, 0), -1);
+
+ /* (neg (lt x 0)) is (ashiftrt X C) if STORE_FLAG_VALUE is 1. */
+ /* (neg (lt x 0)) is (lshiftrt X C) if STORE_FLAG_VALUE is -1. */
+ if (GET_CODE (op) == LT
+ && XEXP (op, 1) == const0_rtx
+ && SCALAR_INT_MODE_P (GET_MODE (XEXP (op, 0))))
+ {
+ enum machine_mode inner = GET_MODE (XEXP (op, 0));
+ int isize = GET_MODE_BITSIZE (inner);
+ if (STORE_FLAG_VALUE == 1)
+ {
+ temp = simplify_gen_binary (ASHIFTRT, inner, XEXP (op, 0),
+ GEN_INT (isize - 1));
+ if (mode == inner)
+ return temp;
+ if (GET_MODE_BITSIZE (mode) > isize)
+ return simplify_gen_unary (SIGN_EXTEND, mode, temp, inner);
+ return simplify_gen_unary (TRUNCATE, mode, temp, inner);
+ }
+ else if (STORE_FLAG_VALUE == -1)
+ {
+ temp = simplify_gen_binary (LSHIFTRT, inner, XEXP (op, 0),
+ GEN_INT (isize - 1));
+ if (mode == inner)
+ return temp;
+ if (GET_MODE_BITSIZE (mode) > isize)
+ return simplify_gen_unary (ZERO_EXTEND, mode, temp, inner);
+ return simplify_gen_unary (TRUNCATE, mode, temp, inner);
+ }
+ }
+ break;
+
+ case TRUNCATE:
+ /* We can't handle truncation to a partial integer mode here
+ because we don't know the real bitsize of the partial
+ integer mode. */
+ if (GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
+ break;
+
+ /* (truncate:SI ({sign,zero}_extend:DI foo:SI)) == foo:SI. */
+ if ((GET_CODE (op) == SIGN_EXTEND
+ || GET_CODE (op) == ZERO_EXTEND)
+ && GET_MODE (XEXP (op, 0)) == mode)
+ return XEXP (op, 0);
+
+ /* (truncate:SI (OP:DI ({sign,zero}_extend:DI foo:SI))) is
+ (OP:SI foo:SI) if OP is NEG or ABS. */
+ if ((GET_CODE (op) == ABS
+ || GET_CODE (op) == NEG)
+ && (GET_CODE (XEXP (op, 0)) == SIGN_EXTEND
+ || GET_CODE (XEXP (op, 0)) == ZERO_EXTEND)
+ && GET_MODE (XEXP (XEXP (op, 0), 0)) == mode)
+ return simplify_gen_unary (GET_CODE (op), mode,
+ XEXP (XEXP (op, 0), 0), mode);
+
+ /* (truncate:A (subreg:B (truncate:C X) 0)) is
+ (truncate:A X). */
+ if (GET_CODE (op) == SUBREG
+ && GET_CODE (SUBREG_REG (op)) == TRUNCATE
+ && subreg_lowpart_p (op))
+ return simplify_gen_unary (TRUNCATE, mode, XEXP (SUBREG_REG (op), 0),
+ GET_MODE (XEXP (SUBREG_REG (op), 0)));
+
+ /* If we know that the value is already truncated, we can
+ replace the TRUNCATE with a SUBREG. Note that this is also
+ valid if TRULY_NOOP_TRUNCATION is false for the corresponding
+ modes we just have to apply a different definition for
+ truncation. But don't do this for an (LSHIFTRT (MULT ...))
+ since this will cause problems with the umulXi3_highpart
+ patterns. */
+ if ((TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
+ GET_MODE_BITSIZE (GET_MODE (op)))
+ ? (num_sign_bit_copies (op, GET_MODE (op))
+ > (unsigned int) (GET_MODE_BITSIZE (GET_MODE (op))
+ - GET_MODE_BITSIZE (mode)))
+ : truncated_to_mode (mode, op))
+ && ! (GET_CODE (op) == LSHIFTRT
+ && GET_CODE (XEXP (op, 0)) == MULT))
+ return rtl_hooks.gen_lowpart_no_emit (mode, op);
+
+ /* A truncate of a comparison can be replaced with a subreg if
+ STORE_FLAG_VALUE permits. This is like the previous test,
+ but it works even if the comparison is done in a mode larger
+ than HOST_BITS_PER_WIDE_INT. */
+ if (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
+ && COMPARISON_P (op)
+ && ((HOST_WIDE_INT) STORE_FLAG_VALUE & ~GET_MODE_MASK (mode)) == 0)
+ return rtl_hooks.gen_lowpart_no_emit (mode, op);
+ break;
+
+ case FLOAT_TRUNCATE:
+ if (DECIMAL_FLOAT_MODE_P (mode))
+ break;
+
+ /* (float_truncate:SF (float_extend:DF foo:SF)) = foo:SF. */
+ if (GET_CODE (op) == FLOAT_EXTEND
+ && GET_MODE (XEXP (op, 0)) == mode)
+ return XEXP (op, 0);
+
+ /* (float_truncate:SF (float_truncate:DF foo:XF))
+ = (float_truncate:SF foo:XF).
+ This may eliminate double rounding, so it is unsafe.
+
+ (float_truncate:SF (float_extend:XF foo:DF))
+ = (float_truncate:SF foo:DF).
+
+ (float_truncate:DF (float_extend:XF foo:SF))
+ = (float_extend:SF foo:DF). */
+ if ((GET_CODE (op) == FLOAT_TRUNCATE
+ && flag_unsafe_math_optimizations)
+ || GET_CODE (op) == FLOAT_EXTEND)
+ return simplify_gen_unary (GET_MODE_SIZE (GET_MODE (XEXP (op,
+ 0)))
+ > GET_MODE_SIZE (mode)
+ ? FLOAT_TRUNCATE : FLOAT_EXTEND,
+ mode,
+ XEXP (op, 0), mode);
+
+ /* (float_truncate (float x)) is (float x) */
+ if (GET_CODE (op) == FLOAT
+ && (flag_unsafe_math_optimizations
+ || (SCALAR_FLOAT_MODE_P (GET_MODE (op))
+ && ((unsigned)significand_size (GET_MODE (op))
+ >= (GET_MODE_BITSIZE (GET_MODE (XEXP (op, 0)))
+ - num_sign_bit_copies (XEXP (op, 0),
+ GET_MODE (XEXP (op, 0))))))))
+ return simplify_gen_unary (FLOAT, mode,
+ XEXP (op, 0),
+ GET_MODE (XEXP (op, 0)));
+
+ /* (float_truncate:SF (OP:DF (float_extend:DF foo:sf))) is
+ (OP:SF foo:SF) if OP is NEG or ABS. */
+ if ((GET_CODE (op) == ABS
+ || GET_CODE (op) == NEG)
+ && GET_CODE (XEXP (op, 0)) == FLOAT_EXTEND
+ && GET_MODE (XEXP (XEXP (op, 0), 0)) == mode)
+ return simplify_gen_unary (GET_CODE (op), mode,
+ XEXP (XEXP (op, 0), 0), mode);
+
+ /* (float_truncate:SF (subreg:DF (float_truncate:SF X) 0))
+ is (float_truncate:SF x). */
+ if (GET_CODE (op) == SUBREG
+ && subreg_lowpart_p (op)
+ && GET_CODE (SUBREG_REG (op)) == FLOAT_TRUNCATE)
+ return SUBREG_REG (op);
+ break;
+
+ case FLOAT_EXTEND:
+ if (DECIMAL_FLOAT_MODE_P (mode))
+ break;
+
+ /* (float_extend (float_extend x)) is (float_extend x)
+
+ (float_extend (float x)) is (float x) assuming that double
+ rounding can't happen.
+ */
+ if (GET_CODE (op) == FLOAT_EXTEND
+ || (GET_CODE (op) == FLOAT
+ && SCALAR_FLOAT_MODE_P (GET_MODE (op))
+ && ((unsigned)significand_size (GET_MODE (op))
+ >= (GET_MODE_BITSIZE (GET_MODE (XEXP (op, 0)))
+ - num_sign_bit_copies (XEXP (op, 0),
+ GET_MODE (XEXP (op, 0)))))))
+ return simplify_gen_unary (GET_CODE (op), mode,
+ XEXP (op, 0),
+ GET_MODE (XEXP (op, 0)));
+
+ break;
+
+ case ABS:
+ /* (abs (neg )) -> (abs ) */
+ if (GET_CODE (op) == NEG)
+ return simplify_gen_unary (ABS, mode, XEXP (op, 0),
+ GET_MODE (XEXP (op, 0)));
+
+ /* If the mode of the operand is VOIDmode (i.e. if it is ASM_OPERANDS),
+ do nothing. */
+ if (GET_MODE (op) == VOIDmode)
+ break;
+
+ /* If operand is something known to be positive, ignore the ABS. */
+ if (GET_CODE (op) == FFS || GET_CODE (op) == ABS
+ || ((GET_MODE_BITSIZE (GET_MODE (op))
+ <= HOST_BITS_PER_WIDE_INT)
+ && ((nonzero_bits (op, GET_MODE (op))
+ & ((HOST_WIDE_INT) 1
+ << (GET_MODE_BITSIZE (GET_MODE (op)) - 1)))
+ == 0)))
+ return op;
+
+ /* If operand is known to be only -1 or 0, convert ABS to NEG. */
+ if (num_sign_bit_copies (op, mode) == GET_MODE_BITSIZE (mode))
+ return gen_rtx_NEG (mode, op);
+
+ break;
+
+ case FFS:
+ /* (ffs (*_extend )) = (ffs ) */
+ if (GET_CODE (op) == SIGN_EXTEND
+ || GET_CODE (op) == ZERO_EXTEND)
+ return simplify_gen_unary (FFS, mode, XEXP (op, 0),
+ GET_MODE (XEXP (op, 0)));
+ break;
+
+ case POPCOUNT:
+ switch (GET_CODE (op))
+ {
+ case BSWAP:
+ case ZERO_EXTEND:
+ /* (popcount (zero_extend )) = (popcount ) */
+ return simplify_gen_unary (POPCOUNT, mode, XEXP (op, 0),
+ GET_MODE (XEXP (op, 0)));
+
+ case ROTATE:
+ case ROTATERT:
+ /* Rotations don't affect popcount. */
+ if (!side_effects_p (XEXP (op, 1)))
+ return simplify_gen_unary (POPCOUNT, mode, XEXP (op, 0),
+ GET_MODE (XEXP (op, 0)));
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ case PARITY:
+ switch (GET_CODE (op))
+ {
+ case NOT:
+ case BSWAP:
+ case ZERO_EXTEND:
+ case SIGN_EXTEND:
+ return simplify_gen_unary (PARITY, mode, XEXP (op, 0),
+ GET_MODE (XEXP (op, 0)));
+
+ case ROTATE:
+ case ROTATERT:
+ /* Rotations don't affect parity. */
+ if (!side_effects_p (XEXP (op, 1)))
+ return simplify_gen_unary (PARITY, mode, XEXP (op, 0),
+ GET_MODE (XEXP (op, 0)));
+ break;
+
+ default:
+ break;
+ }
+ break;
+
+ case BSWAP:
+ /* (bswap (bswap x)) -> x. */
+ if (GET_CODE (op) == BSWAP)
+ return XEXP (op, 0);
+ break;
+
+ case FLOAT:
+ /* (float (sign_extend )) = (float ). */
+ if (GET_CODE (op) == SIGN_EXTEND)
+ return simplify_gen_unary (FLOAT, mode, XEXP (op, 0),
+ GET_MODE (XEXP (op, 0)));
break;
case SIGN_EXTEND:
@@ -572,11 +1006,15 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
if (GET_CODE (op) == SUBREG
&& SUBREG_PROMOTED_VAR_P (op)
&& ! SUBREG_PROMOTED_UNSIGNED_P (op)
- && GET_MODE (XEXP (op, 0)) == mode)
- return XEXP (op, 0);
+ && GET_MODE_SIZE (mode) <= GET_MODE_SIZE (GET_MODE (XEXP (op, 0))))
+ return rtl_hooks.gen_lowpart_no_emit (mode, op);
#if defined(POINTERS_EXTEND_UNSIGNED) && !defined(HAVE_ptr_extend)
- if (! POINTERS_EXTEND_UNSIGNED
+ /* As we do not know which address space the pointer is refering to,
+ we can do this only if the target does not support different pointer
+ or address modes depending on the address space. */
+ if (target_default_pointer_address_modes_p ()
+ && ! POINTERS_EXTEND_UNSIGNED
&& mode == Pmode && GET_MODE (op) == ptr_mode
&& (CONSTANT_P (op)
|| (GET_CODE (op) == SUBREG
@@ -594,11 +1032,15 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
if (GET_CODE (op) == SUBREG
&& SUBREG_PROMOTED_VAR_P (op)
&& SUBREG_PROMOTED_UNSIGNED_P (op) > 0
- && GET_MODE (XEXP (op, 0)) == mode)
- return XEXP (op, 0);
+ && GET_MODE_SIZE (mode) <= GET_MODE_SIZE (GET_MODE (XEXP (op, 0))))
+ return rtl_hooks.gen_lowpart_no_emit (mode, op);
#if defined(POINTERS_EXTEND_UNSIGNED) && !defined(HAVE_ptr_extend)
- if (POINTERS_EXTEND_UNSIGNED > 0
+ /* As we do not know which address space the pointer is refering to,
+ we can do this only if the target does not support different pointer
+ or address modes depending on the address space. */
+ if (target_default_pointer_address_modes_p ()
+ && POINTERS_EXTEND_UNSIGNED > 0
&& mode == Pmode && GET_MODE (op) == ptr_mode
&& (CONSTANT_P (op)
|| (GET_CODE (op) == SUBREG
@@ -612,7 +1054,7 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
default:
break;
}
-
+
return 0;
}
@@ -636,7 +1078,7 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode,
gcc_assert (GET_MODE_INNER (mode) == GET_MODE_INNER
(GET_MODE (op)));
}
- if (GET_CODE (op) == CONST_INT || GET_CODE (op) == CONST_DOUBLE
+ if (CONST_INT_P (op) || GET_CODE (op) == CONST_DOUBLE
|| GET_CODE (op) == CONST_VECTOR)
{
int elt_size = GET_MODE_SIZE (GET_MODE_INNER (mode));
@@ -690,12 +1132,12 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode,
such as FIX. At some point, this should be simplified. */
if (code == FLOAT && GET_MODE (op) == VOIDmode
- && (GET_CODE (op) == CONST_DOUBLE || GET_CODE (op) == CONST_INT))
+ && (GET_CODE (op) == CONST_DOUBLE || CONST_INT_P (op)))
{
HOST_WIDE_INT hv, lv;
REAL_VALUE_TYPE d;
- if (GET_CODE (op) == CONST_INT)
+ if (CONST_INT_P (op))
lv = INTVAL (op), hv = HWI_SIGN_EXTEND (lv);
else
lv = CONST_DOUBLE_LOW (op), hv = CONST_DOUBLE_HIGH (op);
@@ -706,12 +1148,12 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode,
}
else if (code == UNSIGNED_FLOAT && GET_MODE (op) == VOIDmode
&& (GET_CODE (op) == CONST_DOUBLE
- || GET_CODE (op) == CONST_INT))
+ || CONST_INT_P (op)))
{
HOST_WIDE_INT hv, lv;
REAL_VALUE_TYPE d;
- if (GET_CODE (op) == CONST_INT)
+ if (CONST_INT_P (op))
lv = INTVAL (op), hv = HWI_SIGN_EXTEND (lv);
else
lv = CONST_DOUBLE_LOW (op), hv = CONST_DOUBLE_HIGH (op);
@@ -733,7 +1175,7 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode,
return CONST_DOUBLE_FROM_REAL_VALUE (d, mode);
}
- if (GET_CODE (op) == CONST_INT
+ if (CONST_INT_P (op)
&& width <= HOST_BITS_PER_WIDE_INT && width > 0)
{
HOST_WIDE_INT arg0 = INTVAL (op);
@@ -796,6 +1238,21 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode,
val &= 1;
break;
+ case BSWAP:
+ {
+ unsigned int s;
+
+ val = 0;
+ for (s = 0; s < width; s += 8)
+ {
+ unsigned int d = width - s - 8;
+ unsigned HOST_WIDE_INT byte;
+ byte = (arg0 >> s) & 0xff;
+ val |= byte << d;
+ }
+ }
+ break;
+
case TRUNCATE:
val = arg0;
break;
@@ -846,6 +1303,9 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode,
case FLOAT_TRUNCATE:
case SS_TRUNCATE:
case US_TRUNCATE:
+ case SS_NEG:
+ case US_NEG:
+ case SS_ABS:
return 0;
default:
@@ -860,7 +1320,7 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode,
else if (GET_MODE (op) == VOIDmode
&& width <= HOST_BITS_PER_WIDE_INT * 2
&& (GET_CODE (op) == CONST_DOUBLE
- || GET_CODE (op) == CONST_INT))
+ || CONST_INT_P (op)))
{
unsigned HOST_WIDE_INT l1, lv;
HOST_WIDE_INT h1, hv;
@@ -941,6 +1401,30 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode,
lv &= 1;
break;
+ case BSWAP:
+ {
+ unsigned int s;
+
+ hv = 0;
+ lv = 0;
+ for (s = 0; s < width; s += 8)
+ {
+ unsigned int d = width - s - 8;
+ unsigned HOST_WIDE_INT byte;
+
+ if (s < HOST_BITS_PER_WIDE_INT)
+ byte = (l1 >> s) & 0xff;
+ else
+ byte = (h1 >> (s - HOST_BITS_PER_WIDE_INT)) & 0xff;
+
+ if (d < HOST_BITS_PER_WIDE_INT)
+ lv |= byte << d;
+ else
+ hv |= byte << (d - HOST_BITS_PER_WIDE_INT);
+ }
+ }
+ break;
+
case TRUNCATE:
/* This is just a change-of-mode, so do nothing. */
lv = l1, hv = h1;
@@ -983,7 +1467,7 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode,
}
else if (GET_CODE (op) == CONST_DOUBLE
- && GET_MODE_CLASS (mode) == MODE_FLOAT)
+ && SCALAR_FLOAT_MODE_P (mode))
{
REAL_VALUE_TYPE d, t;
REAL_VALUE_FROM_CONST_DOUBLE (d, op);
@@ -997,10 +1481,10 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode,
d = t;
break;
case ABS:
- d = REAL_VALUE_ABS (d);
+ d = real_value_abs (&d);
break;
case NEG:
- d = REAL_VALUE_NEGATE (d);
+ d = real_value_negate (&d);
break;
case FLOAT_TRUNCATE:
d = real_value_truncate (mode, d);
@@ -1029,7 +1513,7 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode,
}
else if (GET_CODE (op) == CONST_DOUBLE
- && GET_MODE_CLASS (GET_MODE (op)) == MODE_FLOAT
+ && SCALAR_FLOAT_MODE_P (GET_MODE (op))
&& GET_MODE_CLASS (mode) == MODE_INT
&& width <= 2*HOST_BITS_PER_WIDE_INT && width > 0)
{
@@ -1172,16 +1656,12 @@ simplify_associative_operation (enum rtx_code code, enum machine_mode mode,
}
/* Attempt to simplify "(a op b) op c" as "a op (b op c)". */
- tem = swap_commutative_operands_p (XEXP (op0, 1), op1)
- ? simplify_binary_operation (code, mode, op1, XEXP (op0, 1))
- : simplify_binary_operation (code, mode, XEXP (op0, 1), op1);
+ tem = simplify_binary_operation (code, mode, XEXP (op0, 1), op1);
if (tem != 0)
return simplify_gen_binary (code, mode, XEXP (op0, 0), tem);
/* Attempt to simplify "(a op b) op c" as "(a op c) op b". */
- tem = swap_commutative_operands_p (XEXP (op0, 0), op1)
- ? simplify_binary_operation (code, mode, op1, XEXP (op0, 0))
- : simplify_binary_operation (code, mode, XEXP (op0, 0), op1);
+ tem = simplify_binary_operation (code, mode, XEXP (op0, 0), op1);
if (tem != 0)
return simplify_gen_binary (code, mode, tem, XEXP (op0, 1));
}
@@ -1225,11 +1705,16 @@ simplify_binary_operation (enum rtx_code code, enum machine_mode mode,
return simplify_binary_operation_1 (code, mode, op0, op1, trueop0, trueop1);
}
+/* Subroutine of simplify_binary_operation. Simplify a binary operation
+ CODE with result mode MODE, operating on OP0 and OP1. If OP0 and/or
+ OP1 are constant pool references, TRUEOP0 and TRUEOP1 represent the
+ actual constants. */
+
static rtx
simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
rtx op0, rtx op1, rtx trueop0, rtx trueop1)
{
- rtx tem;
+ rtx tem, reversed, opleft, opright;
HOST_WIDE_INT val;
unsigned int width = GET_MODE_BITSIZE (mode);
@@ -1265,11 +1750,15 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
to CONST_INT since overflow won't be computed properly if wider
than HOST_BITS_PER_WIDE_INT. */
- if (CONSTANT_P (op0) && GET_MODE (op0) != VOIDmode
- && GET_CODE (op1) == CONST_INT)
+ if ((GET_CODE (op0) == CONST
+ || GET_CODE (op0) == SYMBOL_REF
+ || GET_CODE (op0) == LABEL_REF)
+ && CONST_INT_P (op1))
return plus_constant (op0, INTVAL (op1));
- else if (CONSTANT_P (op1) && GET_MODE (op1) != VOIDmode
- && GET_CODE (op0) == CONST_INT)
+ else if ((GET_CODE (op1) == CONST
+ || GET_CODE (op1) == SYMBOL_REF
+ || GET_CODE (op1) == LABEL_REF)
+ && CONST_INT_P (op0))
return plus_constant (op1, INTVAL (op0));
/* See if this is something like X * C - X or vice versa or
@@ -1280,53 +1769,51 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
if (SCALAR_INT_MODE_P (mode))
{
- HOST_WIDE_INT coeff0h = 0, coeff1h = 0;
- unsigned HOST_WIDE_INT coeff0l = 1, coeff1l = 1;
+ double_int coeff0, coeff1;
rtx lhs = op0, rhs = op1;
+ coeff0 = double_int_one;
+ coeff1 = double_int_one;
+
if (GET_CODE (lhs) == NEG)
{
- coeff0l = -1;
- coeff0h = -1;
+ coeff0 = double_int_minus_one;
lhs = XEXP (lhs, 0);
}
else if (GET_CODE (lhs) == MULT
- && GET_CODE (XEXP (lhs, 1)) == CONST_INT)
+ && CONST_INT_P (XEXP (lhs, 1)))
{
- coeff0l = INTVAL (XEXP (lhs, 1));
- coeff0h = INTVAL (XEXP (lhs, 1)) < 0 ? -1 : 0;
+ coeff0 = shwi_to_double_int (INTVAL (XEXP (lhs, 1)));
lhs = XEXP (lhs, 0);
}
else if (GET_CODE (lhs) == ASHIFT
- && GET_CODE (XEXP (lhs, 1)) == CONST_INT
- && INTVAL (XEXP (lhs, 1)) >= 0
+ && CONST_INT_P (XEXP (lhs, 1))
+ && INTVAL (XEXP (lhs, 1)) >= 0
&& INTVAL (XEXP (lhs, 1)) < HOST_BITS_PER_WIDE_INT)
{
- coeff0l = ((HOST_WIDE_INT) 1) << INTVAL (XEXP (lhs, 1));
- coeff0h = 0;
+ coeff0 = double_int_setbit (double_int_zero,
+ INTVAL (XEXP (lhs, 1)));
lhs = XEXP (lhs, 0);
}
if (GET_CODE (rhs) == NEG)
{
- coeff1l = -1;
- coeff1h = -1;
+ coeff1 = double_int_minus_one;
rhs = XEXP (rhs, 0);
}
else if (GET_CODE (rhs) == MULT
- && GET_CODE (XEXP (rhs, 1)) == CONST_INT)
+ && CONST_INT_P (XEXP (rhs, 1)))
{
- coeff1l = INTVAL (XEXP (rhs, 1));
- coeff1h = INTVAL (XEXP (rhs, 1)) < 0 ? -1 : 0;
+ coeff1 = shwi_to_double_int (INTVAL (XEXP (rhs, 1)));
rhs = XEXP (rhs, 0);
}
else if (GET_CODE (rhs) == ASHIFT
- && GET_CODE (XEXP (rhs, 1)) == CONST_INT
+ && CONST_INT_P (XEXP (rhs, 1))
&& INTVAL (XEXP (rhs, 1)) >= 0
&& INTVAL (XEXP (rhs, 1)) < HOST_BITS_PER_WIDE_INT)
{
- coeff1l = ((HOST_WIDE_INT) 1) << INTVAL (XEXP (rhs, 1));
- coeff1h = 0;
+ coeff1 = double_int_setbit (double_int_zero,
+ INTVAL (XEXP (rhs, 1)));
rhs = XEXP (rhs, 0);
}
@@ -1334,29 +1821,53 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
{
rtx orig = gen_rtx_PLUS (mode, op0, op1);
rtx coeff;
- unsigned HOST_WIDE_INT l;
- HOST_WIDE_INT h;
+ double_int val;
+ bool speed = optimize_function_for_speed_p (cfun);
- add_double (coeff0l, coeff0h, coeff1l, coeff1h, &l, &h);
- coeff = immed_double_const (l, h, mode);
+ val = double_int_add (coeff0, coeff1);
+ coeff = immed_double_int_const (val, mode);
tem = simplify_gen_binary (MULT, mode, lhs, coeff);
- return rtx_cost (tem, SET) <= rtx_cost (orig, SET)
+ return rtx_cost (tem, SET, speed) <= rtx_cost (orig, SET, speed)
? tem : 0;
}
}
/* (plus (xor X C1) C2) is (xor X (C1^C2)) if C2 is signbit. */
- if ((GET_CODE (op1) == CONST_INT
+ if ((CONST_INT_P (op1)
|| GET_CODE (op1) == CONST_DOUBLE)
&& GET_CODE (op0) == XOR
- && (GET_CODE (XEXP (op0, 1)) == CONST_INT
+ && (CONST_INT_P (XEXP (op0, 1))
|| GET_CODE (XEXP (op0, 1)) == CONST_DOUBLE)
&& mode_signbit_p (mode, op1))
return simplify_gen_binary (XOR, mode, XEXP (op0, 0),
simplify_gen_binary (XOR, mode, op1,
XEXP (op0, 1)));
+ /* Canonicalize (plus (mult (neg B) C) A) to (minus A (mult B C)). */
+ if (!HONOR_SIGN_DEPENDENT_ROUNDING (mode)
+ && GET_CODE (op0) == MULT
+ && GET_CODE (XEXP (op0, 0)) == NEG)
+ {
+ rtx in1, in2;
+
+ in1 = XEXP (XEXP (op0, 0), 0);
+ in2 = XEXP (op0, 1);
+ return simplify_gen_binary (MINUS, mode, op1,
+ simplify_gen_binary (MULT, mode,
+ in1, in2));
+ }
+
+ /* (plus (comparison A B) C) can become (neg (rev-comp A B)) if
+ C is 1 and STORE_FLAG_VALUE is -1 or if C is -1 and STORE_FLAG_VALUE
+ is 1. */
+ if (COMPARISON_P (op0)
+ && ((STORE_FLAG_VALUE == -1 && trueop1 == const1_rtx)
+ || (STORE_FLAG_VALUE == 1 && trueop1 == constm1_rtx))
+ && (reversed = reversed_comparison (op0, mode)))
+ return
+ simplify_gen_unary (NEG, mode, reversed, mode);
+
/* If one of the operands is a PLUS or a MINUS, see if we can
simplify this by the associative law.
Don't use the associative law for floating point.
@@ -1366,13 +1877,13 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
if (INTEGRAL_MODE_P (mode)
&& (plus_minus_operand_p (op0)
|| plus_minus_operand_p (op1))
- && (tem = simplify_plus_minus (code, mode, op0, op1, 0)) != 0)
+ && (tem = simplify_plus_minus (code, mode, op0, op1)) != 0)
return tem;
/* Reassociate floating point addition only when the user
- specifies unsafe math optimizations. */
+ specifies associative math operations. */
if (FLOAT_MODE_P (mode)
- && flag_unsafe_math_optimizations)
+ && flag_associative_math)
{
tem = simplify_associative_operation (code, mode, op0, op1);
if (tem)
@@ -1381,19 +1892,6 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
break;
case COMPARE:
-#ifdef HAVE_cc0
- /* Convert (compare FOO (const_int 0)) to FOO unless we aren't
- using cc0, in which case we want to leave it as a COMPARE
- so we can distinguish it from a register-register-copy.
-
- In IEEE floating point, x-0 is not the same as x. */
-
- if ((TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT
- || ! FLOAT_MODE_P (mode) || flag_unsafe_math_optimizations)
- && trueop1 == CONST0_RTX (mode))
- return op0;
-#endif
-
/* Convert (compare (gt (flags) 0) (lt (flags) 0)) to (flags). */
if (((GET_CODE (op0) == GT && GET_CODE (op1) == LT)
|| (GET_CODE (op0) == GTU && GET_CODE (op1) == LTU))
@@ -1418,10 +1916,10 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
case MINUS:
/* We can't assume x-x is 0 even with non-IEEE floating point,
but since it is zero except in very strange circumstances, we
- will treat it as zero with -funsafe-math-optimizations. */
+ will treat it as zero with -ffinite-math-only. */
if (rtx_equal_p (trueop0, trueop1)
&& ! side_effects_p (op0)
- && (! FLOAT_MODE_P (mode) || flag_unsafe_math_optimizations))
+ && (!FLOAT_MODE_P (mode) || !HONOR_NANS (mode)))
return CONST0_RTX (mode);
/* Change subtraction from zero into negation. (0 - x) is the
@@ -1451,53 +1949,52 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
if (SCALAR_INT_MODE_P (mode))
{
- HOST_WIDE_INT coeff0h = 0, negcoeff1h = -1;
- unsigned HOST_WIDE_INT coeff0l = 1, negcoeff1l = -1;
+ double_int coeff0, negcoeff1;
rtx lhs = op0, rhs = op1;
+ coeff0 = double_int_one;
+ negcoeff1 = double_int_minus_one;
+
if (GET_CODE (lhs) == NEG)
{
- coeff0l = -1;
- coeff0h = -1;
+ coeff0 = double_int_minus_one;
lhs = XEXP (lhs, 0);
}
else if (GET_CODE (lhs) == MULT
- && GET_CODE (XEXP (lhs, 1)) == CONST_INT)
+ && CONST_INT_P (XEXP (lhs, 1)))
{
- coeff0l = INTVAL (XEXP (lhs, 1));
- coeff0h = INTVAL (XEXP (lhs, 1)) < 0 ? -1 : 0;
+ coeff0 = shwi_to_double_int (INTVAL (XEXP (lhs, 1)));
lhs = XEXP (lhs, 0);
}
else if (GET_CODE (lhs) == ASHIFT
- && GET_CODE (XEXP (lhs, 1)) == CONST_INT
+ && CONST_INT_P (XEXP (lhs, 1))
&& INTVAL (XEXP (lhs, 1)) >= 0
&& INTVAL (XEXP (lhs, 1)) < HOST_BITS_PER_WIDE_INT)
{
- coeff0l = ((HOST_WIDE_INT) 1) << INTVAL (XEXP (lhs, 1));
- coeff0h = 0;
+ coeff0 = double_int_setbit (double_int_zero,
+ INTVAL (XEXP (lhs, 1)));
lhs = XEXP (lhs, 0);
}
if (GET_CODE (rhs) == NEG)
{
- negcoeff1l = 1;
- negcoeff1h = 0;
+ negcoeff1 = double_int_one;
rhs = XEXP (rhs, 0);
}
else if (GET_CODE (rhs) == MULT
- && GET_CODE (XEXP (rhs, 1)) == CONST_INT)
+ && CONST_INT_P (XEXP (rhs, 1)))
{
- negcoeff1l = -INTVAL (XEXP (rhs, 1));
- negcoeff1h = INTVAL (XEXP (rhs, 1)) <= 0 ? 0 : -1;
+ negcoeff1 = shwi_to_double_int (-INTVAL (XEXP (rhs, 1)));
rhs = XEXP (rhs, 0);
}
else if (GET_CODE (rhs) == ASHIFT
- && GET_CODE (XEXP (rhs, 1)) == CONST_INT
+ && CONST_INT_P (XEXP (rhs, 1))
&& INTVAL (XEXP (rhs, 1)) >= 0
&& INTVAL (XEXP (rhs, 1)) < HOST_BITS_PER_WIDE_INT)
{
- negcoeff1l = -(((HOST_WIDE_INT) 1) << INTVAL (XEXP (rhs, 1)));
- negcoeff1h = -1;
+ negcoeff1 = double_int_setbit (double_int_zero,
+ INTVAL (XEXP (rhs, 1)));
+ negcoeff1 = double_int_neg (negcoeff1);
rhs = XEXP (rhs, 0);
}
@@ -1505,14 +2002,14 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
{
rtx orig = gen_rtx_MINUS (mode, op0, op1);
rtx coeff;
- unsigned HOST_WIDE_INT l;
- HOST_WIDE_INT h;
+ double_int val;
+ bool speed = optimize_function_for_speed_p (cfun);
- add_double (coeff0l, coeff0h, negcoeff1l, negcoeff1h, &l, &h);
- coeff = immed_double_const (l, h, mode);
+ val = double_int_add (coeff0, negcoeff1);
+ coeff = immed_double_int_const (val, mode);
tem = simplify_gen_binary (MULT, mode, lhs, coeff);
- return rtx_cost (tem, SET) <= rtx_cost (orig, SET)
+ return rtx_cost (tem, SET, speed) <= rtx_cost (orig, SET, speed)
? tem : 0;
}
}
@@ -1523,7 +2020,7 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
/* (-x - c) may be simplified as (-c - x). */
if (GET_CODE (op0) == NEG
- && (GET_CODE (op1) == CONST_INT
+ && (CONST_INT_P (op1)
|| GET_CODE (op1) == CONST_DOUBLE))
{
tem = simplify_unary_operation (NEG, mode, op1, mode);
@@ -1531,20 +2028,8 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
return simplify_gen_binary (MINUS, mode, tem, XEXP (op0, 0));
}
- /* If one of the operands is a PLUS or a MINUS, see if we can
- simplify this by the associative law.
- Don't use the associative law for floating point.
- The inaccuracy makes it nonassociative,
- and subtle programs can break if operations are associated. */
-
- if (INTEGRAL_MODE_P (mode)
- && (plus_minus_operand_p (op0)
- || plus_minus_operand_p (op1))
- && (tem = simplify_plus_minus (code, mode, op0, op1, 0)) != 0)
- return tem;
-
/* Don't let a relocatable value get a negative coeff. */
- if (GET_CODE (op1) == CONST_INT && GET_MODE (op0) != VOIDmode)
+ if (CONST_INT_P (op1) && GET_MODE (op0) != VOIDmode)
return simplify_gen_binary (PLUS, mode,
op0,
neg_const_int (mode, op1));
@@ -1565,6 +2050,58 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
return simplify_gen_binary (AND, mode, op0, tem);
}
}
+
+ /* If STORE_FLAG_VALUE is 1, (minus 1 (comparison foo bar)) can be done
+ by reversing the comparison code if valid. */
+ if (STORE_FLAG_VALUE == 1
+ && trueop0 == const1_rtx
+ && COMPARISON_P (op1)
+ && (reversed = reversed_comparison (op1, mode)))
+ return reversed;
+
+ /* Canonicalize (minus A (mult (neg B) C)) to (plus (mult B C) A). */
+ if (!HONOR_SIGN_DEPENDENT_ROUNDING (mode)
+ && GET_CODE (op1) == MULT
+ && GET_CODE (XEXP (op1, 0)) == NEG)
+ {
+ rtx in1, in2;
+
+ in1 = XEXP (XEXP (op1, 0), 0);
+ in2 = XEXP (op1, 1);
+ return simplify_gen_binary (PLUS, mode,
+ simplify_gen_binary (MULT, mode,
+ in1, in2),
+ op0);
+ }
+
+ /* Canonicalize (minus (neg A) (mult B C)) to
+ (minus (mult (neg B) C) A). */
+ if (!HONOR_SIGN_DEPENDENT_ROUNDING (mode)
+ && GET_CODE (op1) == MULT
+ && GET_CODE (op0) == NEG)
+ {
+ rtx in1, in2;
+
+ in1 = simplify_gen_unary (NEG, mode, XEXP (op1, 0), mode);
+ in2 = XEXP (op1, 1);
+ return simplify_gen_binary (MINUS, mode,
+ simplify_gen_binary (MULT, mode,
+ in1, in2),
+ XEXP (op0, 0));
+ }
+
+ /* If one of the operands is a PLUS or a MINUS, see if we can
+ simplify this by the associative law. This will, for example,
+ canonicalize (minus A (plus B C)) to (minus (minus A B) C).
+ Don't use the associative law for floating point.
+ The inaccuracy makes it nonassociative,
+ and subtle programs can break if operations are associated. */
+
+ if (INTEGRAL_MODE_P (mode)
+ && (plus_minus_operand_p (op0)
+ || plus_minus_operand_p (op1))
+ && (tem = simplify_plus_minus (code, mode, op0, op1)) != 0)
+ return tem;
break;
case MULT:
@@ -1589,7 +2126,7 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
/* Convert multiply by constant power of two into shift unless
we are still generating RTL. This test is a kludge. */
- if (GET_CODE (trueop1) == CONST_INT
+ if (CONST_INT_P (trueop1)
&& (val = exact_log2 (INTVAL (trueop1))) >= 0
/* If the mode is larger than the host word size, and the
uppermost bit is set, then this isn't a power of two due
@@ -1599,18 +2136,19 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
return simplify_gen_binary (ASHIFT, mode, op0, GEN_INT (val));
/* Likewise for multipliers wider than a word. */
- else if (GET_CODE (trueop1) == CONST_DOUBLE
- && (GET_MODE (trueop1) == VOIDmode
- || GET_MODE_CLASS (GET_MODE (trueop1)) == MODE_INT)
- && GET_MODE (op0) == mode
- && CONST_DOUBLE_LOW (trueop1) == 0
- && (val = exact_log2 (CONST_DOUBLE_HIGH (trueop1))) >= 0)
+ if (GET_CODE (trueop1) == CONST_DOUBLE
+ && (GET_MODE (trueop1) == VOIDmode
+ || GET_MODE_CLASS (GET_MODE (trueop1)) == MODE_INT)
+ && GET_MODE (op0) == mode
+ && CONST_DOUBLE_LOW (trueop1) == 0
+ && (val = exact_log2 (CONST_DOUBLE_HIGH (trueop1))) >= 0)
return simplify_gen_binary (ASHIFT, mode, op0,
GEN_INT (val + HOST_BITS_PER_WIDE_INT));
/* x*2 is x+x and x*(-1) is -x */
if (GET_CODE (trueop1) == CONST_DOUBLE
- && GET_MODE_CLASS (GET_MODE (trueop1)) == MODE_FLOAT
+ && SCALAR_FLOAT_MODE_P (GET_MODE (trueop1))
+ && !DECIMAL_FLOAT_MODE_P (GET_MODE (trueop1))
&& GET_MODE (op0) == mode)
{
REAL_VALUE_TYPE d;
@@ -1619,10 +2157,27 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
if (REAL_VALUES_EQUAL (d, dconst2))
return simplify_gen_binary (PLUS, mode, op0, copy_rtx (op0));
- if (REAL_VALUES_EQUAL (d, dconstm1))
+ if (!HONOR_SNANS (mode)
+ && REAL_VALUES_EQUAL (d, dconstm1))
return simplify_gen_unary (NEG, mode, op0, mode);
}
+ /* Optimize -x * -x as x * x. */
+ if (FLOAT_MODE_P (mode)
+ && GET_CODE (op0) == NEG
+ && GET_CODE (op1) == NEG
+ && rtx_equal_p (XEXP (op0, 0), XEXP (op1, 0))
+ && !side_effects_p (XEXP (op0, 0)))
+ return simplify_gen_binary (MULT, mode, XEXP (op0, 0), XEXP (op1, 0));
+
+ /* Likewise, optimize abs(x) * abs(x) as x * x. */
+ if (SCALAR_FLOAT_MODE_P (mode)
+ && GET_CODE (op0) == ABS
+ && GET_CODE (op1) == ABS
+ && rtx_equal_p (XEXP (op0, 0), XEXP (op1, 0))
+ && !side_effects_p (XEXP (op0, 0)))
+ return simplify_gen_binary (MULT, mode, XEXP (op0, 0), XEXP (op1, 0));
+
/* Reassociate multiplication, but for floating point MULTs
only when the user specifies unsafe math optimizations. */
if (! FLOAT_MODE_P (mode)
@@ -1637,7 +2192,7 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
case IOR:
if (trueop1 == const0_rtx)
return op0;
- if (GET_CODE (trueop1) == CONST_INT
+ if (CONST_INT_P (trueop1)
&& ((INTVAL (trueop1) & GET_MODE_MASK (mode))
== GET_MODE_MASK (mode)))
return op1;
@@ -1649,39 +2204,238 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
&& ! side_effects_p (op0)
&& SCALAR_INT_MODE_P (mode))
return constm1_rtx;
- tem = simplify_associative_operation (code, mode, op0, op1);
- if (tem)
- return tem;
- break;
- case XOR:
- if (trueop1 == const0_rtx)
- return op0;
- if (GET_CODE (trueop1) == CONST_INT
- && ((INTVAL (trueop1) & GET_MODE_MASK (mode))
- == GET_MODE_MASK (mode)))
- return simplify_gen_unary (NOT, mode, op0, mode);
- if (rtx_equal_p (trueop0, trueop1)
- && ! side_effects_p (op0)
- && GET_MODE_CLASS (mode) != MODE_CC)
+ /* (ior A C) is C if all bits of A that might be nonzero are on in C. */
+ if (CONST_INT_P (op1)
+ && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
+ && (nonzero_bits (op0, mode) & ~INTVAL (op1)) == 0)
+ return op1;
+
+ /* Canonicalize (X & C1) | C2. */
+ if (GET_CODE (op0) == AND
+ && CONST_INT_P (trueop1)
+ && CONST_INT_P (XEXP (op0, 1)))
+ {
+ HOST_WIDE_INT mask = GET_MODE_MASK (mode);
+ HOST_WIDE_INT c1 = INTVAL (XEXP (op0, 1));
+ HOST_WIDE_INT c2 = INTVAL (trueop1);
+
+ /* If (C1&C2) == C1, then (X&C1)|C2 becomes X. */
+ if ((c1 & c2) == c1
+ && !side_effects_p (XEXP (op0, 0)))
+ return trueop1;
+
+ /* If (C1|C2) == ~0 then (X&C1)|C2 becomes X|C2. */
+ if (((c1|c2) & mask) == mask)
+ return simplify_gen_binary (IOR, mode, XEXP (op0, 0), op1);
+
+ /* Minimize the number of bits set in C1, i.e. C1 := C1 & ~C2. */
+ if (((c1 & ~c2) & mask) != (c1 & mask))
+ {
+ tem = simplify_gen_binary (AND, mode, XEXP (op0, 0),
+ gen_int_mode (c1 & ~c2, mode));
+ return simplify_gen_binary (IOR, mode, tem, op1);
+ }
+ }
+
+ /* Convert (A & B) | A to A. */
+ if (GET_CODE (op0) == AND
+ && (rtx_equal_p (XEXP (op0, 0), op1)
+ || rtx_equal_p (XEXP (op0, 1), op1))
+ && ! side_effects_p (XEXP (op0, 0))
+ && ! side_effects_p (XEXP (op0, 1)))
+ return op1;
+
+ /* Convert (ior (ashift A CX) (lshiftrt A CY)) where CX+CY equals the
+ mode size to (rotate A CX). */
+
+ if (GET_CODE (op1) == ASHIFT
+ || GET_CODE (op1) == SUBREG)
+ {
+ opleft = op1;
+ opright = op0;
+ }
+ else
+ {
+ opright = op1;
+ opleft = op0;
+ }
+
+ if (GET_CODE (opleft) == ASHIFT && GET_CODE (opright) == LSHIFTRT
+ && rtx_equal_p (XEXP (opleft, 0), XEXP (opright, 0))
+ && CONST_INT_P (XEXP (opleft, 1))
+ && CONST_INT_P (XEXP (opright, 1))
+ && (INTVAL (XEXP (opleft, 1)) + INTVAL (XEXP (opright, 1))
+ == GET_MODE_BITSIZE (mode)))
+ return gen_rtx_ROTATE (mode, XEXP (opright, 0), XEXP (opleft, 1));
+
+ /* Same, but for ashift that has been "simplified" to a wider mode
+ by simplify_shift_const. */
+
+ if (GET_CODE (opleft) == SUBREG
+ && GET_CODE (SUBREG_REG (opleft)) == ASHIFT
+ && GET_CODE (opright) == LSHIFTRT
+ && GET_CODE (XEXP (opright, 0)) == SUBREG
+ && GET_MODE (opleft) == GET_MODE (XEXP (opright, 0))
+ && SUBREG_BYTE (opleft) == SUBREG_BYTE (XEXP (opright, 0))
+ && (GET_MODE_SIZE (GET_MODE (opleft))
+ < GET_MODE_SIZE (GET_MODE (SUBREG_REG (opleft))))
+ && rtx_equal_p (XEXP (SUBREG_REG (opleft), 0),
+ SUBREG_REG (XEXP (opright, 0)))
+ && CONST_INT_P (XEXP (SUBREG_REG (opleft), 1))
+ && CONST_INT_P (XEXP (opright, 1))
+ && (INTVAL (XEXP (SUBREG_REG (opleft), 1)) + INTVAL (XEXP (opright, 1))
+ == GET_MODE_BITSIZE (mode)))
+ return gen_rtx_ROTATE (mode, XEXP (opright, 0),
+ XEXP (SUBREG_REG (opleft), 1));
+
+ /* If we have (ior (and (X C1) C2)), simplify this by making
+ C1 as small as possible if C1 actually changes. */
+ if (CONST_INT_P (op1)
+ && (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
+ || INTVAL (op1) > 0)
+ && GET_CODE (op0) == AND
+ && CONST_INT_P (XEXP (op0, 1))
+ && CONST_INT_P (op1)
+ && (INTVAL (XEXP (op0, 1)) & INTVAL (op1)) != 0)
+ return simplify_gen_binary (IOR, mode,
+ simplify_gen_binary
+ (AND, mode, XEXP (op0, 0),
+ GEN_INT (INTVAL (XEXP (op0, 1))
+ & ~INTVAL (op1))),
+ op1);
+
+ /* If OP0 is (ashiftrt (plus ...) C), it might actually be
+ a (sign_extend (plus ...)). Then check if OP1 is a CONST_INT and
+ the PLUS does not affect any of the bits in OP1: then we can do
+ the IOR as a PLUS and we can associate. This is valid if OP1
+ can be safely shifted left C bits. */
+ if (CONST_INT_P (trueop1) && GET_CODE (op0) == ASHIFTRT
+ && GET_CODE (XEXP (op0, 0)) == PLUS
+ && CONST_INT_P (XEXP (XEXP (op0, 0), 1))
+ && CONST_INT_P (XEXP (op0, 1))
+ && INTVAL (XEXP (op0, 1)) < HOST_BITS_PER_WIDE_INT)
+ {
+ int count = INTVAL (XEXP (op0, 1));
+ HOST_WIDE_INT mask = INTVAL (trueop1) << count;
+
+ if (mask >> count == INTVAL (trueop1)
+ && (mask & nonzero_bits (XEXP (op0, 0), mode)) == 0)
+ return simplify_gen_binary (ASHIFTRT, mode,
+ plus_constant (XEXP (op0, 0), mask),
+ XEXP (op0, 1));
+ }
+
+ tem = simplify_associative_operation (code, mode, op0, op1);
+ if (tem)
+ return tem;
+ break;
+
+ case XOR:
+ if (trueop1 == const0_rtx)
+ return op0;
+ if (CONST_INT_P (trueop1)
+ && ((INTVAL (trueop1) & GET_MODE_MASK (mode))
+ == GET_MODE_MASK (mode)))
+ return simplify_gen_unary (NOT, mode, op0, mode);
+ if (rtx_equal_p (trueop0, trueop1)
+ && ! side_effects_p (op0)
+ && GET_MODE_CLASS (mode) != MODE_CC)
return CONST0_RTX (mode);
/* Canonicalize XOR of the most significant bit to PLUS. */
- if ((GET_CODE (op1) == CONST_INT
+ if ((CONST_INT_P (op1)
|| GET_CODE (op1) == CONST_DOUBLE)
&& mode_signbit_p (mode, op1))
return simplify_gen_binary (PLUS, mode, op0, op1);
/* (xor (plus X C1) C2) is (xor X (C1^C2)) if C1 is signbit. */
- if ((GET_CODE (op1) == CONST_INT
+ if ((CONST_INT_P (op1)
|| GET_CODE (op1) == CONST_DOUBLE)
&& GET_CODE (op0) == PLUS
- && (GET_CODE (XEXP (op0, 1)) == CONST_INT
+ && (CONST_INT_P (XEXP (op0, 1))
|| GET_CODE (XEXP (op0, 1)) == CONST_DOUBLE)
&& mode_signbit_p (mode, XEXP (op0, 1)))
return simplify_gen_binary (XOR, mode, XEXP (op0, 0),
simplify_gen_binary (XOR, mode, op1,
XEXP (op0, 1)));
-
+
+ /* If we are XORing two things that have no bits in common,
+ convert them into an IOR. This helps to detect rotation encoded
+ using those methods and possibly other simplifications. */
+
+ if (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
+ && (nonzero_bits (op0, mode)
+ & nonzero_bits (op1, mode)) == 0)
+ return (simplify_gen_binary (IOR, mode, op0, op1));
+
+ /* Convert (XOR (NOT x) (NOT y)) to (XOR x y).
+ Also convert (XOR (NOT x) y) to (NOT (XOR x y)), similarly for
+ (NOT y). */
+ {
+ int num_negated = 0;
+
+ if (GET_CODE (op0) == NOT)
+ num_negated++, op0 = XEXP (op0, 0);
+ if (GET_CODE (op1) == NOT)
+ num_negated++, op1 = XEXP (op1, 0);
+
+ if (num_negated == 2)
+ return simplify_gen_binary (XOR, mode, op0, op1);
+ else if (num_negated == 1)
+ return simplify_gen_unary (NOT, mode,
+ simplify_gen_binary (XOR, mode, op0, op1),
+ mode);
+ }
+
+ /* Convert (xor (and A B) B) to (and (not A) B). The latter may
+ correspond to a machine insn or result in further simplifications
+ if B is a constant. */
+
+ if (GET_CODE (op0) == AND
+ && rtx_equal_p (XEXP (op0, 1), op1)
+ && ! side_effects_p (op1))
+ return simplify_gen_binary (AND, mode,
+ simplify_gen_unary (NOT, mode,
+ XEXP (op0, 0), mode),
+ op1);
+
+ else if (GET_CODE (op0) == AND
+ && rtx_equal_p (XEXP (op0, 0), op1)
+ && ! side_effects_p (op1))
+ return simplify_gen_binary (AND, mode,
+ simplify_gen_unary (NOT, mode,
+ XEXP (op0, 1), mode),
+ op1);
+
+ /* (xor (comparison foo bar) (const_int 1)) can become the reversed
+ comparison if STORE_FLAG_VALUE is 1. */
+ if (STORE_FLAG_VALUE == 1
+ && trueop1 == const1_rtx
+ && COMPARISON_P (op0)
+ && (reversed = reversed_comparison (op0, mode)))
+ return reversed;
+
+ /* (lshiftrt foo C) where C is the number of bits in FOO minus 1
+ is (lt foo (const_int 0)), so we can perform the above
+ simplification if STORE_FLAG_VALUE is 1. */
+
+ if (STORE_FLAG_VALUE == 1
+ && trueop1 == const1_rtx
+ && GET_CODE (op0) == LSHIFTRT
+ && CONST_INT_P (XEXP (op0, 1))
+ && INTVAL (XEXP (op0, 1)) == GET_MODE_BITSIZE (mode) - 1)
+ return gen_rtx_GE (mode, XEXP (op0, 0), const0_rtx);
+
+ /* (xor (comparison foo bar) (const_int sign-bit))
+ when STORE_FLAG_VALUE is the sign bit. */
+ if (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
+ && ((STORE_FLAG_VALUE & GET_MODE_MASK (mode))
+ == (unsigned HOST_WIDE_INT) 1 << (GET_MODE_BITSIZE (mode) - 1))
+ && trueop1 == const_true_rtx
+ && COMPARISON_P (op0)
+ && (reversed = reversed_comparison (op0, mode)))
+ return reversed;
+
tem = simplify_associative_operation (code, mode, op0, op1);
if (tem)
return tem;
@@ -1690,12 +2444,24 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
case AND:
if (trueop1 == CONST0_RTX (mode) && ! side_effects_p (op0))
return trueop1;
- /* If we are turning off bits already known off in OP0, we need
- not do an AND. */
- if (GET_CODE (trueop1) == CONST_INT
- && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
- && (nonzero_bits (trueop0, mode) & ~INTVAL (trueop1)) == 0)
- return op0;
+ if (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
+ {
+ HOST_WIDE_INT nzop0 = nonzero_bits (trueop0, mode);
+ HOST_WIDE_INT nzop1;
+ if (CONST_INT_P (trueop1))
+ {
+ HOST_WIDE_INT val1 = INTVAL (trueop1);
+ /* If we are turning off bits already known off in OP0, we need
+ not do an AND. */
+ if ((nzop0 & ~val1) == 0)
+ return op0;
+ }
+ nzop1 = nonzero_bits (trueop1, mode);
+ /* If we are clearing all the nonzero bits, the result is zero. */
+ if ((nzop1 & nzop0) == 0
+ && !side_effects_p (op0) && !side_effects_p (op1))
+ return CONST0_RTX (mode);
+ }
if (rtx_equal_p (trueop0, trueop1) && ! side_effects_p (op0)
&& GET_MODE_CLASS (mode) != MODE_CC)
return op0;
@@ -1710,7 +2476,7 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
there are no nonzero bits of C outside of X's mode. */
if ((GET_CODE (op0) == SIGN_EXTEND
|| GET_CODE (op0) == ZERO_EXTEND)
- && GET_CODE (trueop1) == CONST_INT
+ && CONST_INT_P (trueop1)
&& GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
&& (~GET_MODE_MASK (GET_MODE (XEXP (op0, 0)))
& INTVAL (trueop1)) == 0)
@@ -1722,12 +2488,77 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
return simplify_gen_unary (ZERO_EXTEND, mode, tem, imode);
}
+ /* Transform (and (truncate X) C) into (truncate (and X C)). This way
+ we might be able to further simplify the AND with X and potentially
+ remove the truncation altogether. */
+ if (GET_CODE (op0) == TRUNCATE && CONST_INT_P (trueop1))
+ {
+ rtx x = XEXP (op0, 0);
+ enum machine_mode xmode = GET_MODE (x);
+ tem = simplify_gen_binary (AND, xmode, x,
+ gen_int_mode (INTVAL (trueop1), xmode));
+ return simplify_gen_unary (TRUNCATE, mode, tem, xmode);
+ }
+
+ /* Canonicalize (A | C1) & C2 as (A & C2) | (C1 & C2). */
+ if (GET_CODE (op0) == IOR
+ && CONST_INT_P (trueop1)
+ && CONST_INT_P (XEXP (op0, 1)))
+ {
+ HOST_WIDE_INT tmp = INTVAL (trueop1) & INTVAL (XEXP (op0, 1));
+ return simplify_gen_binary (IOR, mode,
+ simplify_gen_binary (AND, mode,
+ XEXP (op0, 0), op1),
+ gen_int_mode (tmp, mode));
+ }
+
+ /* Convert (A ^ B) & A to A & (~B) since the latter is often a single
+ insn (and may simplify more). */
+ if (GET_CODE (op0) == XOR
+ && rtx_equal_p (XEXP (op0, 0), op1)
+ && ! side_effects_p (op1))
+ return simplify_gen_binary (AND, mode,
+ simplify_gen_unary (NOT, mode,
+ XEXP (op0, 1), mode),
+ op1);
+
+ if (GET_CODE (op0) == XOR
+ && rtx_equal_p (XEXP (op0, 1), op1)
+ && ! side_effects_p (op1))
+ return simplify_gen_binary (AND, mode,
+ simplify_gen_unary (NOT, mode,
+ XEXP (op0, 0), mode),
+ op1);
+
+ /* Similarly for (~(A ^ B)) & A. */
+ if (GET_CODE (op0) == NOT
+ && GET_CODE (XEXP (op0, 0)) == XOR
+ && rtx_equal_p (XEXP (XEXP (op0, 0), 0), op1)
+ && ! side_effects_p (op1))
+ return simplify_gen_binary (AND, mode, XEXP (XEXP (op0, 0), 1), op1);
+
+ if (GET_CODE (op0) == NOT
+ && GET_CODE (XEXP (op0, 0)) == XOR
+ && rtx_equal_p (XEXP (XEXP (op0, 0), 1), op1)
+ && ! side_effects_p (op1))
+ return simplify_gen_binary (AND, mode, XEXP (XEXP (op0, 0), 0), op1);
+
+ /* Convert (A | B) & A to A. */
+ if (GET_CODE (op0) == IOR
+ && (rtx_equal_p (XEXP (op0, 0), op1)
+ || rtx_equal_p (XEXP (op0, 1), op1))
+ && ! side_effects_p (XEXP (op0, 0))
+ && ! side_effects_p (XEXP (op0, 1)))
+ return op1;
+
/* For constants M and N, if M == (1LL << cst) - 1 && (N & M) == M,
((A & N) + B) & M -> (A + B) & M
Similarly if (N & M) == 0,
((A | N) + B) & M -> (A + B) & M
- and for - instead of + and/or ^ instead of |. */
- if (GET_CODE (trueop1) == CONST_INT
+ and for - instead of + and/or ^ instead of |.
+ Also, if (N & M) == 0, then
+ (A +- N) & M -> A & M. */
+ if (CONST_INT_P (trueop1)
&& GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
&& ~INTVAL (trueop1)
&& (INTVAL (trueop1) & (INTVAL (trueop1) + 1)) == 0
@@ -1739,20 +2570,24 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
pmop[0] = XEXP (op0, 0);
pmop[1] = XEXP (op0, 1);
+ if (CONST_INT_P (pmop[1])
+ && (INTVAL (pmop[1]) & INTVAL (trueop1)) == 0)
+ return simplify_gen_binary (AND, mode, pmop[0], op1);
+
for (which = 0; which < 2; which++)
{
tem = pmop[which];
switch (GET_CODE (tem))
{
case AND:
- if (GET_CODE (XEXP (tem, 1)) == CONST_INT
+ if (CONST_INT_P (XEXP (tem, 1))
&& (INTVAL (XEXP (tem, 1)) & INTVAL (trueop1))
== INTVAL (trueop1))
pmop[which] = XEXP (tem, 0);
break;
case IOR:
case XOR:
- if (GET_CODE (XEXP (tem, 1)) == CONST_INT
+ if (CONST_INT_P (XEXP (tem, 1))
&& (INTVAL (XEXP (tem, 1)) & INTVAL (trueop1)) == 0)
pmop[which] = XEXP (tem, 0);
break;
@@ -1768,6 +2603,19 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
return simplify_gen_binary (code, mode, tem, op1);
}
}
+
+ /* (and X (ior (not X) Y) -> (and X Y) */
+ if (GET_CODE (op1) == IOR
+ && GET_CODE (XEXP (op1, 0)) == NOT
+ && op0 == XEXP (XEXP (op1, 0), 0))
+ return simplify_gen_binary (AND, mode, op0, XEXP (op1, 1));
+
+ /* (and (ior (not X) Y) X) -> (and X Y) */
+ if (GET_CODE (op0) == IOR
+ && GET_CODE (XEXP (op0, 0)) == NOT
+ && op1 == XEXP (XEXP (op0, 0), 0))
+ return simplify_gen_binary (AND, mode, op1, XEXP (op0, 1));
+
tem = simplify_associative_operation (code, mode, op0, op1);
if (tem)
return tem;
@@ -1785,14 +2633,14 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
if (trueop1 == CONST1_RTX (mode))
return rtl_hooks.gen_lowpart_no_emit (mode, op0);
/* Convert divide by power of two into shift. */
- if (GET_CODE (trueop1) == CONST_INT
+ if (CONST_INT_P (trueop1)
&& (val = exact_log2 (INTVAL (trueop1))) > 0)
return simplify_gen_binary (LSHIFTRT, mode, op0, GEN_INT (val));
break;
case DIV:
/* Handle floating point and integers separately. */
- if (GET_MODE_CLASS (mode) == MODE_FLOAT)
+ if (SCALAR_FLOAT_MODE_P (mode))
{
/* Maybe change 0.0 / x to 0.0. This transformation isn't
safe for modes with NaNs, since 0.0 / 0.0 will then be
@@ -1820,8 +2668,8 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
return simplify_gen_unary (NEG, mode, op0, mode);
/* Change FP division by a constant into multiplication.
- Only do this with -funsafe-math-optimizations. */
- if (flag_unsafe_math_optimizations
+ Only do this with -freciprocal-math. */
+ if (flag_reciprocal_math
&& !REAL_VALUES_EQUAL (d, dconst0))
{
REAL_ARITHMETIC (d, RDIV_EXPR, dconst1, d);
@@ -1867,7 +2715,7 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
return CONST0_RTX (mode);
}
/* Implement modulus by power of two as AND. */
- if (GET_CODE (trueop1) == CONST_INT
+ if (CONST_INT_P (trueop1)
&& exact_log2 (INTVAL (trueop1)) > 0)
return simplify_gen_binary (AND, mode, op0,
GEN_INT (INTVAL (op1) - 1));
@@ -1893,25 +2741,58 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
case ROTATERT:
case ROTATE:
case ASHIFTRT:
+ if (trueop1 == CONST0_RTX (mode))
+ return op0;
+ if (trueop0 == CONST0_RTX (mode) && ! side_effects_p (op1))
+ return op0;
/* Rotating ~0 always results in ~0. */
- if (GET_CODE (trueop0) == CONST_INT && width <= HOST_BITS_PER_WIDE_INT
+ if (CONST_INT_P (trueop0) && width <= HOST_BITS_PER_WIDE_INT
&& (unsigned HOST_WIDE_INT) INTVAL (trueop0) == GET_MODE_MASK (mode)
&& ! side_effects_p (op1))
return op0;
-
- /* Fall through.... */
+ canonicalize_shift:
+ if (SHIFT_COUNT_TRUNCATED && CONST_INT_P (op1))
+ {
+ val = INTVAL (op1) & (GET_MODE_BITSIZE (mode) - 1);
+ if (val != INTVAL (op1))
+ return simplify_gen_binary (code, mode, op0, GEN_INT (val));
+ }
+ break;
case ASHIFT:
+ case SS_ASHIFT:
+ case US_ASHIFT:
+ if (trueop1 == CONST0_RTX (mode))
+ return op0;
+ if (trueop0 == CONST0_RTX (mode) && ! side_effects_p (op1))
+ return op0;
+ goto canonicalize_shift;
+
case LSHIFTRT:
if (trueop1 == CONST0_RTX (mode))
return op0;
if (trueop0 == CONST0_RTX (mode) && ! side_effects_p (op1))
return op0;
- break;
+ /* Optimize (lshiftrt (clz X) C) as (eq X 0). */
+ if (GET_CODE (op0) == CLZ
+ && CONST_INT_P (trueop1)
+ && STORE_FLAG_VALUE == 1
+ && INTVAL (trueop1) < (HOST_WIDE_INT)width)
+ {
+ enum machine_mode imode = GET_MODE (XEXP (op0, 0));
+ unsigned HOST_WIDE_INT zero_val = 0;
+
+ if (CLZ_DEFINED_VALUE_AT_ZERO (imode, zero_val)
+ && zero_val == GET_MODE_BITSIZE (imode)
+ && INTVAL (trueop1) == exact_log2 (zero_val))
+ return simplify_gen_relational (EQ, mode, imode,
+ XEXP (op0, 0), const0_rtx);
+ }
+ goto canonicalize_shift;
case SMIN:
if (width <= HOST_BITS_PER_WIDE_INT
- && GET_CODE (trueop1) == CONST_INT
+ && CONST_INT_P (trueop1)
&& INTVAL (trueop1) == (HOST_WIDE_INT) 1 << (width -1)
&& ! side_effects_p (op0))
return op1;
@@ -1924,7 +2805,7 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
case SMAX:
if (width <= HOST_BITS_PER_WIDE_INT
- && GET_CODE (trueop1) == CONST_INT
+ && CONST_INT_P (trueop1)
&& ((unsigned HOST_WIDE_INT) INTVAL (trueop1)
== (unsigned HOST_WIDE_INT) GET_MODE_MASK (mode) >> 1)
&& ! side_effects_p (op0))
@@ -1960,6 +2841,10 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
case US_PLUS:
case SS_MINUS:
case US_MINUS:
+ case SS_MULT:
+ case US_MULT:
+ case SS_DIV:
+ case US_DIV:
/* ??? There are simplifications that can be done. */
return 0;
@@ -1970,11 +2855,93 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
gcc_assert (mode == GET_MODE_INNER (GET_MODE (trueop0)));
gcc_assert (GET_CODE (trueop1) == PARALLEL);
gcc_assert (XVECLEN (trueop1, 0) == 1);
- gcc_assert (GET_CODE (XVECEXP (trueop1, 0, 0)) == CONST_INT);
+ gcc_assert (CONST_INT_P (XVECEXP (trueop1, 0, 0)));
if (GET_CODE (trueop0) == CONST_VECTOR)
return CONST_VECTOR_ELT (trueop0, INTVAL (XVECEXP
(trueop1, 0, 0)));
+
+ /* Extract a scalar element from a nested VEC_SELECT expression
+ (with optional nested VEC_CONCAT expression). Some targets
+ (i386) extract scalar element from a vector using chain of
+ nested VEC_SELECT expressions. When input operand is a memory
+ operand, this operation can be simplified to a simple scalar
+ load from an offseted memory address. */
+ if (GET_CODE (trueop0) == VEC_SELECT)
+ {
+ rtx op0 = XEXP (trueop0, 0);
+ rtx op1 = XEXP (trueop0, 1);
+
+ enum machine_mode opmode = GET_MODE (op0);
+ int elt_size = GET_MODE_SIZE (GET_MODE_INNER (opmode));
+ int n_elts = GET_MODE_SIZE (opmode) / elt_size;
+
+ int i = INTVAL (XVECEXP (trueop1, 0, 0));
+ int elem;
+
+ rtvec vec;
+ rtx tmp_op, tmp;
+
+ gcc_assert (GET_CODE (op1) == PARALLEL);
+ gcc_assert (i < n_elts);
+
+ /* Select element, pointed by nested selector. */
+ elem = INTVAL (XVECEXP (op1, 0, i));
+
+ /* Handle the case when nested VEC_SELECT wraps VEC_CONCAT. */
+ if (GET_CODE (op0) == VEC_CONCAT)
+ {
+ rtx op00 = XEXP (op0, 0);
+ rtx op01 = XEXP (op0, 1);
+
+ enum machine_mode mode00, mode01;
+ int n_elts00, n_elts01;
+
+ mode00 = GET_MODE (op00);
+ mode01 = GET_MODE (op01);
+
+ /* Find out number of elements of each operand. */
+ if (VECTOR_MODE_P (mode00))
+ {
+ elt_size = GET_MODE_SIZE (GET_MODE_INNER (mode00));
+ n_elts00 = GET_MODE_SIZE (mode00) / elt_size;
+ }
+ else
+ n_elts00 = 1;
+
+ if (VECTOR_MODE_P (mode01))
+ {
+ elt_size = GET_MODE_SIZE (GET_MODE_INNER (mode01));
+ n_elts01 = GET_MODE_SIZE (mode01) / elt_size;
+ }
+ else
+ n_elts01 = 1;
+
+ gcc_assert (n_elts == n_elts00 + n_elts01);
+
+ /* Select correct operand of VEC_CONCAT
+ and adjust selector. */
+ if (elem < n_elts01)
+ tmp_op = op00;
+ else
+ {
+ tmp_op = op01;
+ elem -= n_elts00;
+ }
+ }
+ else
+ tmp_op = op0;
+
+ vec = rtvec_alloc (1);
+ RTVEC_ELT (vec, 0) = GEN_INT (elem);
+
+ tmp = gen_rtx_fmt_ee (code, mode,
+ tmp_op, gen_rtx_PARALLEL (VOIDmode, vec));
+ return tmp;
+ }
+ if (GET_CODE (trueop0) == VEC_DUPLICATE
+ && GET_MODE (XEXP (trueop0, 0)) == mode)
+ return XEXP (trueop0, 0);
}
else
{
@@ -1995,7 +2962,7 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
{
rtx x = XVECEXP (trueop1, 0, i);
- gcc_assert (GET_CODE (x) == CONST_INT);
+ gcc_assert (CONST_INT_P (x));
RTVEC_ELT (v, i) = CONST_VECTOR_ELT (trueop0,
INTVAL (x));
}
@@ -2003,6 +2970,33 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
return gen_rtx_CONST_VECTOR (mode, v);
}
}
+
+ if (XVECLEN (trueop1, 0) == 1
+ && CONST_INT_P (XVECEXP (trueop1, 0, 0))
+ && GET_CODE (trueop0) == VEC_CONCAT)
+ {
+ rtx vec = trueop0;
+ int offset = INTVAL (XVECEXP (trueop1, 0, 0)) * GET_MODE_SIZE (mode);
+
+ /* Try to find the element in the VEC_CONCAT. */
+ while (GET_MODE (vec) != mode
+ && GET_CODE (vec) == VEC_CONCAT)
+ {
+ HOST_WIDE_INT vec_size = GET_MODE_SIZE (GET_MODE (XEXP (vec, 0)));
+ if (offset < vec_size)
+ vec = XEXP (vec, 0);
+ else
+ {
+ offset -= vec_size;
+ vec = XEXP (vec, 1);
+ }
+ vec = avoid_constant_pool_reference (vec);
+ }
+
+ if (GET_MODE (vec) == mode)
+ return vec;
+ }
+
return 0;
case VEC_CONCAT:
{
@@ -2030,10 +3024,10 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
gcc_assert (GET_MODE_INNER (mode) == op1_mode);
if ((GET_CODE (trueop0) == CONST_VECTOR
- || GET_CODE (trueop0) == CONST_INT
+ || CONST_INT_P (trueop0)
|| GET_CODE (trueop0) == CONST_DOUBLE)
&& (GET_CODE (trueop1) == CONST_VECTOR
- || GET_CODE (trueop1) == CONST_INT
+ || CONST_INT_P (trueop1)
|| GET_CODE (trueop1) == CONST_DOUBLE))
{
int elt_size = GET_MODE_SIZE (GET_MODE_INNER (mode));
@@ -2113,7 +3107,12 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
if (VECTOR_MODE_P (mode)
&& code == VEC_CONCAT
- && CONSTANT_P (op0) && CONSTANT_P (op1))
+ && (CONST_INT_P (op0)
+ || GET_CODE (op0) == CONST_DOUBLE
+ || GET_CODE (op0) == CONST_FIXED)
+ && (CONST_INT_P (op1)
+ || GET_CODE (op1) == CONST_DOUBLE
+ || GET_CODE (op1) == CONST_FIXED))
{
unsigned n_elts = GET_MODE_NUNITS (mode);
rtvec v = rtvec_alloc (n_elts);
@@ -2146,7 +3145,7 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
return gen_rtx_CONST_VECTOR (mode, v);
}
- if (GET_MODE_CLASS (mode) == MODE_FLOAT
+ if (SCALAR_FLOAT_MODE_P (mode)
&& GET_CODE (op0) == CONST_DOUBLE
&& GET_CODE (op1) == CONST_DOUBLE
&& mode == GET_MODE (op0) && mode == GET_MODE (op1))
@@ -2259,8 +3258,7 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
is unable to accurately represent the result. */
if ((flag_rounding_math
- || (REAL_MODE_FORMAT_COMPOSITE_P (mode)
- && !flag_unsafe_math_optimizations))
+ || (MODE_COMPOSITE_P (mode) && !flag_unsafe_math_optimizations))
&& (inexact || !real_identical (&result, &value)))
return NULL_RTX;
@@ -2271,8 +3269,8 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
/* We can fold some multi-word operations. */
if (GET_MODE_CLASS (mode) == MODE_INT
&& width == HOST_BITS_PER_WIDE_INT * 2
- && (GET_CODE (op0) == CONST_DOUBLE || GET_CODE (op0) == CONST_INT)
- && (GET_CODE (op1) == CONST_DOUBLE || GET_CODE (op1) == CONST_INT))
+ && (GET_CODE (op0) == CONST_DOUBLE || CONST_INT_P (op0))
+ && (GET_CODE (op1) == CONST_DOUBLE || CONST_INT_P (op1)))
{
unsigned HOST_WIDE_INT l1, l2, lv, lt;
HOST_WIDE_INT h1, h2, hv, ht;
@@ -2407,7 +3405,7 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
return immed_double_const (lv, hv, mode);
}
- if (GET_CODE (op0) == CONST_INT && GET_CODE (op1) == CONST_INT
+ if (CONST_INT_P (op0) && CONST_INT_P (op1)
&& width <= HOST_BITS_PER_WIDE_INT && width != 0)
{
/* Get the integer argument values in two forms:
@@ -2434,23 +3432,23 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
arg0s = arg0;
arg1s = arg1;
}
-
+
/* Compute the value of the arithmetic. */
-
+
switch (code)
{
case PLUS:
val = arg0s + arg1s;
break;
-
+
case MINUS:
val = arg0s - arg1s;
break;
-
+
case MULT:
val = arg0s * arg1s;
break;
-
+
case DIV:
if (arg1s == 0
|| (arg0s == (HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1)
@@ -2458,7 +3456,7 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
return 0;
val = arg0s / arg1s;
break;
-
+
case MOD:
if (arg1s == 0
|| (arg0s == (HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1)
@@ -2466,7 +3464,7 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
return 0;
val = arg0s % arg1s;
break;
-
+
case UDIV:
if (arg1 == 0
|| (arg0s == (HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1)
@@ -2474,7 +3472,7 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
return 0;
val = (unsigned HOST_WIDE_INT) arg0 / arg1;
break;
-
+
case UMOD:
if (arg1 == 0
|| (arg0s == (HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1)
@@ -2482,19 +3480,19 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
return 0;
val = (unsigned HOST_WIDE_INT) arg0 % arg1;
break;
-
+
case AND:
val = arg0 & arg1;
break;
-
+
case IOR:
val = arg0 | arg1;
break;
-
+
case XOR:
val = arg0 ^ arg1;
break;
-
+
case LSHIFTRT:
case ASHIFT:
case ASHIFTRT:
@@ -2509,63 +3507,69 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
arg1 = (unsigned HOST_WIDE_INT) arg1 % width;
else if (arg1 < 0 || arg1 >= GET_MODE_BITSIZE (mode))
return 0;
-
+
val = (code == ASHIFT
? ((unsigned HOST_WIDE_INT) arg0) << arg1
: ((unsigned HOST_WIDE_INT) arg0) >> arg1);
-
+
/* Sign-extend the result for arithmetic right shifts. */
if (code == ASHIFTRT && arg0s < 0 && arg1 > 0)
val |= ((HOST_WIDE_INT) -1) << (width - arg1);
break;
-
+
case ROTATERT:
if (arg1 < 0)
return 0;
-
+
arg1 %= width;
val = ((((unsigned HOST_WIDE_INT) arg0) << (width - arg1))
| (((unsigned HOST_WIDE_INT) arg0) >> arg1));
break;
-
+
case ROTATE:
if (arg1 < 0)
return 0;
-
+
arg1 %= width;
val = ((((unsigned HOST_WIDE_INT) arg0) << arg1)
| (((unsigned HOST_WIDE_INT) arg0) >> (width - arg1)));
break;
-
+
case COMPARE:
/* Do nothing here. */
return 0;
-
+
case SMIN:
val = arg0s <= arg1s ? arg0s : arg1s;
break;
-
+
case UMIN:
val = ((unsigned HOST_WIDE_INT) arg0
<= (unsigned HOST_WIDE_INT) arg1 ? arg0 : arg1);
break;
-
+
case SMAX:
val = arg0s > arg1s ? arg0s : arg1s;
break;
-
+
case UMAX:
val = ((unsigned HOST_WIDE_INT) arg0
> (unsigned HOST_WIDE_INT) arg1 ? arg0 : arg1);
break;
-
+
case SS_PLUS:
case US_PLUS:
case SS_MINUS:
case US_MINUS:
+ case SS_MULT:
+ case US_MULT:
+ case SS_DIV:
+ case US_DIV:
+ case SS_ASHIFT:
+ case US_ASHIFT:
/* ??? There are simplifications that can be done. */
return 0;
-
+
default:
gcc_unreachable ();
}
@@ -2583,42 +3587,39 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode,
Rather than test for specific case, we do this by a brute-force method
and do all possible simplifications until no more changes occur. Then
- we rebuild the operation.
-
- If FORCE is true, then always generate the rtx. This is used to
- canonicalize stuff emitted from simplify_gen_binary. Note that this
- can still fail if the rtx is too complex. It won't fail just because
- the result is not 'simpler' than the input, however. */
+ we rebuild the operation. */
struct simplify_plus_minus_op_data
{
rtx op;
short neg;
- short ix;
};
-static int
-simplify_plus_minus_op_data_cmp (const void *p1, const void *p2)
+static bool
+simplify_plus_minus_op_data_cmp (rtx x, rtx y)
{
- const struct simplify_plus_minus_op_data *d1 = p1;
- const struct simplify_plus_minus_op_data *d2 = p2;
int result;
- result = (commutative_operand_precedence (d2->op)
- - commutative_operand_precedence (d1->op));
+ result = (commutative_operand_precedence (y)
+ - commutative_operand_precedence (x));
if (result)
- return result;
- return d1->ix - d2->ix;
+ return result > 0;
+
+ /* Group together equal REGs to do more simplification. */
+ if (REG_P (x) && REG_P (y))
+ return REGNO (x) > REGNO (y);
+ else
+ return false;
}
static rtx
simplify_plus_minus (enum rtx_code code, enum machine_mode mode, rtx op0,
- rtx op1, int force)
+ rtx op1)
{
struct simplify_plus_minus_op_data ops[8];
rtx result, tem;
- int n_ops = 2, input_ops = 2, input_consts = 0, n_consts;
- int first, changed;
+ int n_ops = 2, input_ops = 2;
+ int changed, n_constants = 0, canonicalized = 0;
int i, j;
memset (ops, 0, sizeof ops);
@@ -2656,12 +3657,14 @@ simplify_plus_minus (enum rtx_code code, enum machine_mode mode, rtx op0,
ops[i].op = XEXP (this_op, 0);
input_ops++;
changed = 1;
+ canonicalized |= this_neg;
break;
case NEG:
ops[i].op = XEXP (this_op, 0);
ops[i].neg = ! this_neg;
changed = 1;
+ canonicalized = 1;
break;
case CONST:
@@ -2674,8 +3677,8 @@ simplify_plus_minus (enum rtx_code code, enum machine_mode mode, rtx op0,
ops[n_ops].op = XEXP (XEXP (this_op, 0), 1);
ops[n_ops].neg = this_neg;
n_ops++;
- input_consts++;
changed = 1;
+ canonicalized = 1;
}
break;
@@ -2688,15 +3691,18 @@ simplify_plus_minus (enum rtx_code code, enum machine_mode mode, rtx op0,
ops[i].op = XEXP (this_op, 0);
ops[i].neg = !this_neg;
changed = 1;
+ canonicalized = 1;
}
break;
case CONST_INT:
+ n_constants++;
if (this_neg)
{
ops[i].op = neg_const_int (mode, this_op);
ops[i].neg = 0;
changed = 1;
+ canonicalized = 1;
}
break;
@@ -2707,31 +3713,65 @@ simplify_plus_minus (enum rtx_code code, enum machine_mode mode, rtx op0,
}
while (changed);
- /* If we only have two operands, we can't do anything. */
- if (n_ops <= 2 && !force)
- return NULL_RTX;
+ if (n_constants > 1)
+ canonicalized = 1;
+
+ gcc_assert (n_ops >= 2);
- /* Count the number of CONSTs we didn't split above. */
- for (i = 0; i < n_ops; i++)
- if (GET_CODE (ops[i].op) == CONST)
- input_consts++;
+ /* If we only have two operands, we can avoid the loops. */
+ if (n_ops == 2)
+ {
+ enum rtx_code code = ops[0].neg || ops[1].neg ? MINUS : PLUS;
+ rtx lhs, rhs;
+
+ /* Get the two operands. Be careful with the order, especially for
+ the cases where code == MINUS. */
+ if (ops[0].neg && ops[1].neg)
+ {
+ lhs = gen_rtx_NEG (mode, ops[0].op);
+ rhs = ops[1].op;
+ }
+ else if (ops[0].neg)
+ {
+ lhs = ops[1].op;
+ rhs = ops[0].op;
+ }
+ else
+ {
+ lhs = ops[0].op;
+ rhs = ops[1].op;
+ }
- /* Now simplify each pair of operands until nothing changes. The first
- time through just simplify constants against each other. */
+ return simplify_const_binary_operation (code, mode, lhs, rhs);
+ }
- first = 1;
+ /* Now simplify each pair of operands until nothing changes. */
do
{
- changed = first;
+ /* Insertion sort is good enough for an eight-element array. */
+ for (i = 1; i < n_ops; i++)
+ {
+ struct simplify_plus_minus_op_data save;
+ j = i - 1;
+ if (!simplify_plus_minus_op_data_cmp (ops[j].op, ops[i].op))
+ continue;
+
+ canonicalized = 1;
+ save = ops[i];
+ do
+ ops[j + 1] = ops[j];
+ while (j-- && simplify_plus_minus_op_data_cmp (ops[j].op, save.op));
+ ops[j + 1] = save;
+ }
- for (i = 0; i < n_ops - 1; i++)
- for (j = i + 1; j < n_ops; j++)
+ changed = 0;
+ for (i = n_ops - 1; i > 0; i--)
+ for (j = i - 1; j >= 0; j--)
{
- rtx lhs = ops[i].op, rhs = ops[j].op;
- int lneg = ops[i].neg, rneg = ops[j].neg;
+ rtx lhs = ops[j].op, rhs = ops[i].op;
+ int lneg = ops[j].neg, rneg = ops[i].neg;
- if (lhs != 0 && rhs != 0
- && (! first || (CONSTANT_P (lhs) && CONSTANT_P (rhs))))
+ if (lhs != 0 && rhs != 0)
{
enum rtx_code ncode = PLUS;
@@ -2744,7 +3784,20 @@ simplify_plus_minus (enum rtx_code code, enum machine_mode mode, rtx op0,
else if (swap_commutative_operands_p (lhs, rhs))
tem = lhs, lhs = rhs, rhs = tem;
- tem = simplify_binary_operation (ncode, mode, lhs, rhs);
+ if ((GET_CODE (lhs) == CONST || CONST_INT_P (lhs))
+ && (GET_CODE (rhs) == CONST || CONST_INT_P (rhs)))
+ {
+ rtx tem_lhs, tem_rhs;
+
+ tem_lhs = GET_CODE (lhs) == CONST ? XEXP (lhs, 0) : lhs;
+ tem_rhs = GET_CODE (rhs) == CONST ? XEXP (rhs, 0) : rhs;
+ tem = simplify_binary_operation (ncode, mode, tem_lhs, tem_rhs);
+
+ if (tem && !CONSTANT_P (tem))
+ tem = gen_rtx_CONST (GET_MODE (tem), tem);
+ }
+ else
+ tem = simplify_binary_operation (ncode, mode, lhs, rhs);
/* Reject "simplifications" that just wrap the two
arguments in a CONST. Failure to do so can result
@@ -2754,53 +3807,45 @@ simplify_plus_minus (enum rtx_code code, enum machine_mode mode, rtx op0,
&& ! (GET_CODE (tem) == CONST
&& GET_CODE (XEXP (tem, 0)) == ncode
&& XEXP (XEXP (tem, 0), 0) == lhs
- && XEXP (XEXP (tem, 0), 1) == rhs)
- /* Don't allow -x + -1 -> ~x simplifications in the
- first pass. This allows us the chance to combine
- the -1 with other constants. */
- && ! (first
- && GET_CODE (tem) == NOT
- && XEXP (tem, 0) == rhs))
+ && XEXP (XEXP (tem, 0), 1) == rhs))
{
lneg &= rneg;
if (GET_CODE (tem) == NEG)
tem = XEXP (tem, 0), lneg = !lneg;
- if (GET_CODE (tem) == CONST_INT && lneg)
+ if (CONST_INT_P (tem) && lneg)
tem = neg_const_int (mode, tem), lneg = 0;
ops[i].op = tem;
ops[i].neg = lneg;
ops[j].op = NULL_RTX;
changed = 1;
+ canonicalized = 1;
}
}
}
- first = 0;
+ /* If nothing changed, fail. */
+ if (!canonicalized)
+ return NULL_RTX;
+
+ /* Pack all the operands to the lower-numbered entries. */
+ for (i = 0, j = 0; j < n_ops; j++)
+ if (ops[j].op)
+ {
+ ops[i] = ops[j];
+ i++;
+ }
+ n_ops = i;
}
while (changed);
- /* Pack all the operands to the lower-numbered entries. */
- for (i = 0, j = 0; j < n_ops; j++)
- if (ops[j].op)
- {
- ops[i] = ops[j];
- /* Stabilize sort. */
- ops[i].ix = i;
- i++;
- }
- n_ops = i;
-
- /* Sort the operations based on swap_commutative_operands_p. */
- qsort (ops, n_ops, sizeof (*ops), simplify_plus_minus_op_data_cmp);
-
/* Create (minus -C X) instead of (neg (const (plus X C))). */
if (n_ops == 2
- && GET_CODE (ops[1].op) == CONST_INT
+ && CONST_INT_P (ops[1].op)
&& CONSTANT_P (ops[0].op)
&& ops[0].neg)
return gen_rtx_fmt_ee (MINUS, mode, ops[1].op, ops[0].op);
-
+
/* We suppressed creation of trivial CONST expressions in the
combination loop to avoid recursion. Create one manually now.
The combination loop should have ensured that there is exactly
@@ -2808,7 +3853,7 @@ simplify_plus_minus (enum rtx_code code, enum machine_mode mode, rtx op0,
in the array and that any other constant will be next-to-last. */
if (n_ops > 1
- && GET_CODE (ops[n_ops - 1].op) == CONST_INT
+ && CONST_INT_P (ops[n_ops - 1].op)
&& CONSTANT_P (ops[n_ops - 2].op))
{
rtx value = ops[n_ops - 1].op;
@@ -2818,21 +3863,6 @@ simplify_plus_minus (enum rtx_code code, enum machine_mode mode, rtx op0,
n_ops--;
}
- /* Count the number of CONSTs that we generated. */
- n_consts = 0;
- for (i = 0; i < n_ops; i++)
- if (GET_CODE (ops[i].op) == CONST)
- n_consts++;
-
- /* Give up if we didn't reduce the number of operands we had. Make
- sure we count a CONST as two operands. If we have the same
- number of operands, but have made more CONSTs than before, this
- is also an improvement, so accept it. */
- if (!force
- && (n_ops + n_consts > input_ops
- || (n_ops + n_consts == input_ops && n_consts <= input_consts)))
- return NULL_RTX;
-
/* Put a non-negated operand first, if possible. */
for (i = 0; i < n_ops && ops[i].neg; i++)
@@ -2858,7 +3888,7 @@ simplify_plus_minus (enum rtx_code code, enum machine_mode mode, rtx op0,
/* Check whether an operand is suitable for calling simplify_plus_minus. */
static bool
-plus_minus_operand_p (rtx x)
+plus_minus_operand_p (const_rtx x)
{
return GET_CODE (x) == PLUS
|| GET_CODE (x) == MINUS
@@ -2890,7 +3920,7 @@ simplify_relational_operation (enum rtx_code code, enum machine_mode mode,
tem = simplify_const_relational_operation (code, cmp_mode, op0, op1);
if (tem)
{
- if (GET_MODE_CLASS (mode) == MODE_FLOAT)
+ if (SCALAR_FLOAT_MODE_P (mode))
{
if (tem == const0_rtx)
return CONST0_RTX (mode);
@@ -2902,7 +3932,7 @@ simplify_relational_operation (enum rtx_code code, enum machine_mode mode,
}
#else
return NULL_RTX;
-#endif
+#endif
}
if (VECTOR_MODE_P (mode))
{
@@ -2940,11 +3970,10 @@ simplify_relational_operation (enum rtx_code code, enum machine_mode mode,
/* If op0 is a compare, extract the comparison arguments from it. */
if (GET_CODE (op0) == COMPARE && op1 == const0_rtx)
- return simplify_relational_operation (code, mode, VOIDmode,
- XEXP (op0, 0), XEXP (op0, 1));
+ return simplify_gen_relational (code, mode, VOIDmode,
+ XEXP (op0, 0), XEXP (op0, 1));
- if (mode == VOIDmode
- || GET_MODE_CLASS (cmp_mode) == MODE_CC
+ if (GET_MODE_CLASS (cmp_mode) == MODE_CC
|| CC0_P (op0))
return NULL_RTX;
@@ -2966,28 +3995,92 @@ simplify_relational_operation_1 (enum rtx_code code, enum machine_mode mode,
{
enum rtx_code op0code = GET_CODE (op0);
- if (GET_CODE (op1) == CONST_INT)
+ if (op1 == const0_rtx && COMPARISON_P (op0))
{
- if (INTVAL (op1) == 0 && COMPARISON_P (op0))
+ /* If op0 is a comparison, extract the comparison arguments
+ from it. */
+ if (code == NE)
{
- /* If op0 is a comparison, extract the comparison arguments form it. */
- if (code == NE)
- {
- if (GET_MODE (op0) == mode)
- return simplify_rtx (op0);
- else
- return simplify_gen_relational (GET_CODE (op0), mode, VOIDmode,
- XEXP (op0, 0), XEXP (op0, 1));
- }
- else if (code == EQ)
- {
- enum rtx_code new_code = reversed_comparison_code (op0, NULL_RTX);
- if (new_code != UNKNOWN)
- return simplify_gen_relational (new_code, mode, VOIDmode,
- XEXP (op0, 0), XEXP (op0, 1));
- }
+ if (GET_MODE (op0) == mode)
+ return simplify_rtx (op0);
+ else
+ return simplify_gen_relational (GET_CODE (op0), mode, VOIDmode,
+ XEXP (op0, 0), XEXP (op0, 1));
+ }
+ else if (code == EQ)
+ {
+ enum rtx_code new_code = reversed_comparison_code (op0, NULL_RTX);
+ if (new_code != UNKNOWN)
+ return simplify_gen_relational (new_code, mode, VOIDmode,
+ XEXP (op0, 0), XEXP (op0, 1));
+ }
+ }
+
+ /* (LTU/GEU (PLUS a C) C), where C is constant, can be simplified to
+ (GEU/LTU a -C). Likewise for (LTU/GEU (PLUS a C) a). */
+ if ((code == LTU || code == GEU)
+ && GET_CODE (op0) == PLUS
+ && CONST_INT_P (XEXP (op0, 1))
+ && (rtx_equal_p (op1, XEXP (op0, 0))
+ || rtx_equal_p (op1, XEXP (op0, 1))))
+ {
+ rtx new_cmp
+ = simplify_gen_unary (NEG, cmp_mode, XEXP (op0, 1), cmp_mode);
+ return simplify_gen_relational ((code == LTU ? GEU : LTU), mode,
+ cmp_mode, XEXP (op0, 0), new_cmp);
+ }
+
+ /* Canonicalize (LTU/GEU (PLUS a b) b) as (LTU/GEU (PLUS a b) a). */
+ if ((code == LTU || code == GEU)
+ && GET_CODE (op0) == PLUS
+ && rtx_equal_p (op1, XEXP (op0, 1))
+ /* Don't recurse "infinitely" for (LTU/GEU (PLUS b b) b). */
+ && !rtx_equal_p (op1, XEXP (op0, 0)))
+ return simplify_gen_relational (code, mode, cmp_mode, op0,
+ copy_rtx (XEXP (op0, 0)));
+
+ if (op1 == const0_rtx)
+ {
+ /* Canonicalize (GTU x 0) as (NE x 0). */
+ if (code == GTU)
+ return simplify_gen_relational (NE, mode, cmp_mode, op0, op1);
+ /* Canonicalize (LEU x 0) as (EQ x 0). */
+ if (code == LEU)
+ return simplify_gen_relational (EQ, mode, cmp_mode, op0, op1);
+ }
+ else if (op1 == const1_rtx)
+ {
+ switch (code)
+ {
+ case GE:
+ /* Canonicalize (GE x 1) as (GT x 0). */
+ return simplify_gen_relational (GT, mode, cmp_mode,
+ op0, const0_rtx);
+ case GEU:
+ /* Canonicalize (GEU x 1) as (NE x 0). */
+ return simplify_gen_relational (NE, mode, cmp_mode,
+ op0, const0_rtx);
+ case LT:
+ /* Canonicalize (LT x 1) as (LE x 0). */
+ return simplify_gen_relational (LE, mode, cmp_mode,
+ op0, const0_rtx);
+ case LTU:
+ /* Canonicalize (LTU x 1) as (EQ x 0). */
+ return simplify_gen_relational (EQ, mode, cmp_mode,
+ op0, const0_rtx);
+ default:
+ break;
}
}
+ else if (op1 == constm1_rtx)
+ {
+ /* Canonicalize (LE x -1) as (LT x 0). */
+ if (code == LE)
+ return simplify_gen_relational (LT, mode, cmp_mode, op0, const0_rtx);
+ /* Canonicalize (GT x -1) as (GE x 0). */
+ if (code == GT)
+ return simplify_gen_relational (GE, mode, cmp_mode, op0, const0_rtx);
+ }
/* (eq/ne (plus x cst1) cst2) simplifies to (eq/ne x (cst2 - cst1)) */
if ((code == EQ || code == NE)
@@ -3019,9 +4112,125 @@ simplify_relational_operation_1 (enum rtx_code code, enum machine_mode mode,
? simplify_gen_unary (ZERO_EXTEND, mode, op0, cmp_mode)
: lowpart_subreg (mode, op0, cmp_mode);
+ /* (eq/ne (xor x y) 0) simplifies to (eq/ne x y). */
+ if ((code == EQ || code == NE)
+ && op1 == const0_rtx
+ && op0code == XOR)
+ return simplify_gen_relational (code, mode, cmp_mode,
+ XEXP (op0, 0), XEXP (op0, 1));
+
+ /* (eq/ne (xor x y) x) simplifies to (eq/ne y 0). */
+ if ((code == EQ || code == NE)
+ && op0code == XOR
+ && rtx_equal_p (XEXP (op0, 0), op1)
+ && !side_effects_p (XEXP (op0, 0)))
+ return simplify_gen_relational (code, mode, cmp_mode,
+ XEXP (op0, 1), const0_rtx);
+
+ /* Likewise (eq/ne (xor x y) y) simplifies to (eq/ne x 0). */
+ if ((code == EQ || code == NE)
+ && op0code == XOR
+ && rtx_equal_p (XEXP (op0, 1), op1)
+ && !side_effects_p (XEXP (op0, 1)))
+ return simplify_gen_relational (code, mode, cmp_mode,
+ XEXP (op0, 0), const0_rtx);
+
+ /* (eq/ne (xor x C1) C2) simplifies to (eq/ne x (C1^C2)). */
+ if ((code == EQ || code == NE)
+ && op0code == XOR
+ && (CONST_INT_P (op1)
+ || GET_CODE (op1) == CONST_DOUBLE)
+ && (CONST_INT_P (XEXP (op0, 1))
+ || GET_CODE (XEXP (op0, 1)) == CONST_DOUBLE))
+ return simplify_gen_relational (code, mode, cmp_mode, XEXP (op0, 0),
+ simplify_gen_binary (XOR, cmp_mode,
+ XEXP (op0, 1), op1));
+
+ if (op0code == POPCOUNT && op1 == const0_rtx)
+ switch (code)
+ {
+ case EQ:
+ case LE:
+ case LEU:
+ /* (eq (popcount x) (const_int 0)) -> (eq x (const_int 0)). */
+ return simplify_gen_relational (EQ, mode, GET_MODE (XEXP (op0, 0)),
+ XEXP (op0, 0), const0_rtx);
+
+ case NE:
+ case GT:
+ case GTU:
+ /* (ne (popcount x) (const_int 0)) -> (ne x (const_int 0)). */
+ return simplify_gen_relational (NE, mode, GET_MODE (XEXP (op0, 0)),
+ XEXP (op0, 0), const0_rtx);
+
+ default:
+ break;
+ }
+
return NULL_RTX;
}
+enum
+{
+ CMP_EQ = 1,
+ CMP_LT = 2,
+ CMP_GT = 4,
+ CMP_LTU = 8,
+ CMP_GTU = 16
+};
+
+
+/* Convert the known results for EQ, LT, GT, LTU, GTU contained in
+ KNOWN_RESULT to a CONST_INT, based on the requested comparison CODE
+ For KNOWN_RESULT to make sense it should be either CMP_EQ, or the
+ logical OR of one of (CMP_LT, CMP_GT) and one of (CMP_LTU, CMP_GTU).
+ For floating-point comparisons, assume that the operands were ordered. */
+
+static rtx
+comparison_result (enum rtx_code code, int known_results)
+{
+ switch (code)
+ {
+ case EQ:
+ case UNEQ:
+ return (known_results & CMP_EQ) ? const_true_rtx : const0_rtx;
+ case NE:
+ case LTGT:
+ return (known_results & CMP_EQ) ? const0_rtx : const_true_rtx;
+
+ case LT:
+ case UNLT:
+ return (known_results & CMP_LT) ? const_true_rtx : const0_rtx;
+ case GE:
+ case UNGE:
+ return (known_results & CMP_LT) ? const0_rtx : const_true_rtx;
+
+ case GT:
+ case UNGT:
+ return (known_results & CMP_GT) ? const_true_rtx : const0_rtx;
+ case LE:
+ case UNLE:
+ return (known_results & CMP_GT) ? const0_rtx : const_true_rtx;
+
+ case LTU:
+ return (known_results & CMP_LTU) ? const_true_rtx : const0_rtx;
+ case GEU:
+ return (known_results & CMP_LTU) ? const0_rtx : const_true_rtx;
+
+ case GTU:
+ return (known_results & CMP_GTU) ? const_true_rtx : const0_rtx;
+ case LEU:
+ return (known_results & CMP_GTU) ? const0_rtx : const_true_rtx;
+
+ case ORDERED:
+ return const_true_rtx;
+ case UNORDERED:
+ return const0_rtx;
+ default:
+ gcc_unreachable ();
+ }
+}
+
/* Check if the given comparison (done in the given MODE) is actually a
tautology or a contradiction.
If no simplification is possible, this function returns zero.
@@ -3032,7 +4241,6 @@ simplify_const_relational_operation (enum rtx_code code,
enum machine_mode mode,
rtx op0, rtx op1)
{
- int equal, op0lt, op0ltu, op1lt, op1ltu;
rtx tem;
rtx trueop0;
rtx trueop1;
@@ -3075,40 +4283,44 @@ simplify_const_relational_operation (enum rtx_code code,
a register or a CONST_INT, this can't help; testing for these cases will
prevent infinite recursion here and speed things up.
- If CODE is an unsigned comparison, then we can never do this optimization,
- because it gives an incorrect result if the subtraction wraps around zero.
- ANSI C defines unsigned operations such that they never overflow, and
- thus such cases can not be ignored; but we cannot do it even for
- signed comparisons for languages such as Java, so test flag_wrapv. */
+ We can only do this for EQ and NE comparisons as otherwise we may
+ lose or introduce overflow which we cannot disregard as undefined as
+ we do not know the signedness of the operation on either the left or
+ the right hand side of the comparison. */
- if (!flag_wrapv && INTEGRAL_MODE_P (mode) && trueop1 != const0_rtx
- && ! ((REG_P (op0) || GET_CODE (trueop0) == CONST_INT)
- && (REG_P (op1) || GET_CODE (trueop1) == CONST_INT))
+ if (INTEGRAL_MODE_P (mode) && trueop1 != const0_rtx
+ && (code == EQ || code == NE)
+ && ! ((REG_P (op0) || CONST_INT_P (trueop0))
+ && (REG_P (op1) || CONST_INT_P (trueop1)))
&& 0 != (tem = simplify_binary_operation (MINUS, mode, op0, op1))
- /* We cannot do this for == or != if tem is a nonzero address. */
- && ((code != EQ && code != NE) || ! nonzero_address_p (tem))
- && code != GTU && code != GEU && code != LTU && code != LEU)
+ /* We cannot do this if tem is a nonzero address. */
+ && ! nonzero_address_p (tem))
return simplify_const_relational_operation (signed_condition (code),
mode, tem, const0_rtx);
- if (flag_unsafe_math_optimizations && code == ORDERED)
+ if (! HONOR_NANS (mode) && code == ORDERED)
return const_true_rtx;
- if (flag_unsafe_math_optimizations && code == UNORDERED)
+ if (! HONOR_NANS (mode) && code == UNORDERED)
return const0_rtx;
/* For modes without NaNs, if the two operands are equal, we know the
- result except if they have side-effects. */
- if (! HONOR_NANS (GET_MODE (trueop0))
+ result except if they have side-effects. Even with NaNs we know
+ the result of unordered comparisons and, if signaling NaNs are
+ irrelevant, also the result of LT/GT/LTGT. */
+ if ((! HONOR_NANS (GET_MODE (trueop0))
+ || code == UNEQ || code == UNLE || code == UNGE
+ || ((code == LT || code == GT || code == LTGT)
+ && ! HONOR_SNANS (GET_MODE (trueop0))))
&& rtx_equal_p (trueop0, trueop1)
&& ! side_effects_p (trueop0))
- equal = 1, op0lt = 0, op0ltu = 0, op1lt = 0, op1ltu = 0;
+ return comparison_result (code, CMP_EQ);
/* If the operands are floating-point constants, see if we can fold
the result. */
- else if (GET_CODE (trueop0) == CONST_DOUBLE
- && GET_CODE (trueop1) == CONST_DOUBLE
- && GET_MODE_CLASS (GET_MODE (trueop0)) == MODE_FLOAT)
+ if (GET_CODE (trueop0) == CONST_DOUBLE
+ && GET_CODE (trueop1) == CONST_DOUBLE
+ && SCALAR_FLOAT_MODE_P (GET_MODE (trueop0)))
{
REAL_VALUE_TYPE d0, d1;
@@ -3139,17 +4351,17 @@ simplify_const_relational_operation (enum rtx_code code,
return 0;
}
- equal = REAL_VALUES_EQUAL (d0, d1);
- op0lt = op0ltu = REAL_VALUES_LESS (d0, d1);
- op1lt = op1ltu = REAL_VALUES_LESS (d1, d0);
+ return comparison_result (code,
+ (REAL_VALUES_EQUAL (d0, d1) ? CMP_EQ :
+ REAL_VALUES_LESS (d0, d1) ? CMP_LT : CMP_GT));
}
/* Otherwise, see if the operands are both integers. */
- else if ((GET_MODE_CLASS (mode) == MODE_INT || mode == VOIDmode)
- && (GET_CODE (trueop0) == CONST_DOUBLE
- || GET_CODE (trueop0) == CONST_INT)
- && (GET_CODE (trueop1) == CONST_DOUBLE
- || GET_CODE (trueop1) == CONST_INT))
+ if ((GET_MODE_CLASS (mode) == MODE_INT || mode == VOIDmode)
+ && (GET_CODE (trueop0) == CONST_DOUBLE
+ || CONST_INT_P (trueop0))
+ && (GET_CODE (trueop1) == CONST_DOUBLE
+ || CONST_INT_P (trueop1)))
{
int width = GET_MODE_BITSIZE (mode);
HOST_WIDE_INT l0s, h0s, l1s, h1s;
@@ -3194,166 +4406,232 @@ simplify_const_relational_operation (enum rtx_code code,
if (width != 0 && width <= HOST_BITS_PER_WIDE_INT)
h0u = h1u = 0, h0s = HWI_SIGN_EXTEND (l0s), h1s = HWI_SIGN_EXTEND (l1s);
- equal = (h0u == h1u && l0u == l1u);
- op0lt = (h0s < h1s || (h0s == h1s && l0u < l1u));
- op1lt = (h1s < h0s || (h1s == h0s && l1u < l0u));
- op0ltu = (h0u < h1u || (h0u == h1u && l0u < l1u));
- op1ltu = (h1u < h0u || (h1u == h0u && l1u < l0u));
+ if (h0u == h1u && l0u == l1u)
+ return comparison_result (code, CMP_EQ);
+ else
+ {
+ int cr;
+ cr = (h0s < h1s || (h0s == h1s && l0u < l1u)) ? CMP_LT : CMP_GT;
+ cr |= (h0u < h1u || (h0u == h1u && l0u < l1u)) ? CMP_LTU : CMP_GTU;
+ return comparison_result (code, cr);
+ }
}
- /* Otherwise, there are some code-specific tests we can make. */
- else
+ /* Optimize comparisons with upper and lower bounds. */
+ if (SCALAR_INT_MODE_P (mode)
+ && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
+ && CONST_INT_P (trueop1))
{
- /* Optimize comparisons with upper and lower bounds. */
- if (SCALAR_INT_MODE_P (mode)
- && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
- {
- rtx mmin, mmax;
- int sign;
-
- if (code == GEU
- || code == LEU
- || code == GTU
- || code == LTU)
- sign = 0;
- else
- sign = 1;
+ int sign;
+ unsigned HOST_WIDE_INT nonzero = nonzero_bits (trueop0, mode);
+ HOST_WIDE_INT val = INTVAL (trueop1);
+ HOST_WIDE_INT mmin, mmax;
+
+ if (code == GEU
+ || code == LEU
+ || code == GTU
+ || code == LTU)
+ sign = 0;
+ else
+ sign = 1;
- get_mode_bounds (mode, sign, mode, &mmin, &mmax);
+ /* Get a reduced range if the sign bit is zero. */
+ if (nonzero <= (GET_MODE_MASK (mode) >> 1))
+ {
+ mmin = 0;
+ mmax = nonzero;
+ }
+ else
+ {
+ rtx mmin_rtx, mmax_rtx;
+ get_mode_bounds (mode, sign, mode, &mmin_rtx, &mmax_rtx);
- tem = NULL_RTX;
- switch (code)
+ mmin = INTVAL (mmin_rtx);
+ mmax = INTVAL (mmax_rtx);
+ if (sign)
{
- case GEU:
- case GE:
- /* x >= min is always true. */
- if (rtx_equal_p (trueop1, mmin))
- tem = const_true_rtx;
- else
- break;
-
- case LEU:
- case LE:
- /* x <= max is always true. */
- if (rtx_equal_p (trueop1, mmax))
- tem = const_true_rtx;
- break;
-
- case GTU:
- case GT:
- /* x > max is always false. */
- if (rtx_equal_p (trueop1, mmax))
- tem = const0_rtx;
- break;
+ unsigned int sign_copies = num_sign_bit_copies (trueop0, mode);
- case LTU:
- case LT:
- /* x < min is always false. */
- if (rtx_equal_p (trueop1, mmin))
- tem = const0_rtx;
- break;
-
- default:
- break;
+ mmin >>= (sign_copies - 1);
+ mmax >>= (sign_copies - 1);
}
- if (tem == const0_rtx
- || tem == const_true_rtx)
- return tem;
}
switch (code)
{
+ /* x >= y is always true for y <= mmin, always false for y > mmax. */
+ case GEU:
+ if ((unsigned HOST_WIDE_INT) val <= (unsigned HOST_WIDE_INT) mmin)
+ return const_true_rtx;
+ if ((unsigned HOST_WIDE_INT) val > (unsigned HOST_WIDE_INT) mmax)
+ return const0_rtx;
+ break;
+ case GE:
+ if (val <= mmin)
+ return const_true_rtx;
+ if (val > mmax)
+ return const0_rtx;
+ break;
+
+ /* x <= y is always true for y >= mmax, always false for y < mmin. */
+ case LEU:
+ if ((unsigned HOST_WIDE_INT) val >= (unsigned HOST_WIDE_INT) mmax)
+ return const_true_rtx;
+ if ((unsigned HOST_WIDE_INT) val < (unsigned HOST_WIDE_INT) mmin)
+ return const0_rtx;
+ break;
+ case LE:
+ if (val >= mmax)
+ return const_true_rtx;
+ if (val < mmin)
+ return const0_rtx;
+ break;
+
case EQ:
- if (trueop1 == const0_rtx && nonzero_address_p (op0))
+ /* x == y is always false for y out of range. */
+ if (val < mmin || val > mmax)
return const0_rtx;
break;
+ /* x > y is always false for y >= mmax, always true for y < mmin. */
+ case GTU:
+ if ((unsigned HOST_WIDE_INT) val >= (unsigned HOST_WIDE_INT) mmax)
+ return const0_rtx;
+ if ((unsigned HOST_WIDE_INT) val < (unsigned HOST_WIDE_INT) mmin)
+ return const_true_rtx;
+ break;
+ case GT:
+ if (val >= mmax)
+ return const0_rtx;
+ if (val < mmin)
+ return const_true_rtx;
+ break;
+
+ /* x < y is always false for y <= mmin, always true for y > mmax. */
+ case LTU:
+ if ((unsigned HOST_WIDE_INT) val <= (unsigned HOST_WIDE_INT) mmin)
+ return const0_rtx;
+ if ((unsigned HOST_WIDE_INT) val > (unsigned HOST_WIDE_INT) mmax)
+ return const_true_rtx;
+ break;
+ case LT:
+ if (val <= mmin)
+ return const0_rtx;
+ if (val > mmax)
+ return const_true_rtx;
+ break;
+
case NE:
- if (trueop1 == const0_rtx && nonzero_address_p (op0))
+ /* x != y is always true for y out of range. */
+ if (val < mmin || val > mmax)
return const_true_rtx;
break;
+ default:
+ break;
+ }
+ }
+
+ /* Optimize integer comparisons with zero. */
+ if (trueop1 == const0_rtx)
+ {
+ /* Some addresses are known to be nonzero. We don't know
+ their sign, but equality comparisons are known. */
+ if (nonzero_address_p (trueop0))
+ {
+ if (code == EQ || code == LEU)
+ return const0_rtx;
+ if (code == NE || code == GTU)
+ return const_true_rtx;
+ }
+
+ /* See if the first operand is an IOR with a constant. If so, we
+ may be able to determine the result of this comparison. */
+ if (GET_CODE (op0) == IOR)
+ {
+ rtx inner_const = avoid_constant_pool_reference (XEXP (op0, 1));
+ if (CONST_INT_P (inner_const) && inner_const != const0_rtx)
+ {
+ int sign_bitnum = GET_MODE_BITSIZE (mode) - 1;
+ int has_sign = (HOST_BITS_PER_WIDE_INT >= sign_bitnum
+ && (INTVAL (inner_const)
+ & ((HOST_WIDE_INT) 1 << sign_bitnum)));
+
+ switch (code)
+ {
+ case EQ:
+ case LEU:
+ return const0_rtx;
+ case NE:
+ case GTU:
+ return const_true_rtx;
+ case LT:
+ case LE:
+ if (has_sign)
+ return const_true_rtx;
+ break;
+ case GT:
+ case GE:
+ if (has_sign)
+ return const0_rtx;
+ break;
+ default:
+ break;
+ }
+ }
+ }
+ }
+
+ /* Optimize comparison of ABS with zero. */
+ if (trueop1 == CONST0_RTX (mode)
+ && (GET_CODE (trueop0) == ABS
+ || (GET_CODE (trueop0) == FLOAT_EXTEND
+ && GET_CODE (XEXP (trueop0, 0)) == ABS)))
+ {
+ switch (code)
+ {
case LT:
/* Optimize abs(x) < 0.0. */
- if (trueop1 == CONST0_RTX (mode)
- && !HONOR_SNANS (mode)
- && !(flag_wrapv && INTEGRAL_MODE_P (mode)))
+ if (!HONOR_SNANS (mode)
+ && (!INTEGRAL_MODE_P (mode)
+ || (!flag_wrapv && !flag_trapv && flag_strict_overflow)))
{
- tem = GET_CODE (trueop0) == FLOAT_EXTEND ? XEXP (trueop0, 0)
- : trueop0;
- if (GET_CODE (tem) == ABS)
- return const0_rtx;
+ if (INTEGRAL_MODE_P (mode)
+ && (issue_strict_overflow_warning
+ (WARN_STRICT_OVERFLOW_CONDITIONAL)))
+ warning (OPT_Wstrict_overflow,
+ ("assuming signed overflow does not occur when "
+ "assuming abs (x) < 0 is false"));
+ return const0_rtx;
}
break;
case GE:
/* Optimize abs(x) >= 0.0. */
- if (trueop1 == CONST0_RTX (mode)
- && !HONOR_NANS (mode)
- && !(flag_wrapv && INTEGRAL_MODE_P (mode)))
+ if (!HONOR_NANS (mode)
+ && (!INTEGRAL_MODE_P (mode)
+ || (!flag_wrapv && !flag_trapv && flag_strict_overflow)))
{
- tem = GET_CODE (trueop0) == FLOAT_EXTEND ? XEXP (trueop0, 0)
- : trueop0;
- if (GET_CODE (tem) == ABS)
- return const_true_rtx;
+ if (INTEGRAL_MODE_P (mode)
+ && (issue_strict_overflow_warning
+ (WARN_STRICT_OVERFLOW_CONDITIONAL)))
+ warning (OPT_Wstrict_overflow,
+ ("assuming signed overflow does not occur when "
+ "assuming abs (x) >= 0 is true"));
+ return const_true_rtx;
}
break;
case UNGE:
/* Optimize ! (abs(x) < 0.0). */
- if (trueop1 == CONST0_RTX (mode))
- {
- tem = GET_CODE (trueop0) == FLOAT_EXTEND ? XEXP (trueop0, 0)
- : trueop0;
- if (GET_CODE (tem) == ABS)
- return const_true_rtx;
- }
- break;
+ return const_true_rtx;
default:
break;
}
-
- return 0;
}
- /* If we reach here, EQUAL, OP0LT, OP0LTU, OP1LT, and OP1LTU are set
- as appropriate. */
- switch (code)
- {
- case EQ:
- case UNEQ:
- return equal ? const_true_rtx : const0_rtx;
- case NE:
- case LTGT:
- return ! equal ? const_true_rtx : const0_rtx;
- case LT:
- case UNLT:
- return op0lt ? const_true_rtx : const0_rtx;
- case GT:
- case UNGT:
- return op1lt ? const_true_rtx : const0_rtx;
- case LTU:
- return op0ltu ? const_true_rtx : const0_rtx;
- case GTU:
- return op1ltu ? const_true_rtx : const0_rtx;
- case LE:
- case UNLE:
- return equal || op0lt ? const_true_rtx : const0_rtx;
- case GE:
- case UNGE:
- return equal || op1lt ? const_true_rtx : const0_rtx;
- case LEU:
- return equal || op0ltu ? const_true_rtx : const0_rtx;
- case GEU:
- return equal || op1ltu ? const_true_rtx : const0_rtx;
- case ORDERED:
- return const_true_rtx;
- case UNORDERED:
- return const0_rtx;
- default:
- gcc_unreachable ();
- }
+ return 0;
}
/* Simplify CODE, an operation with result mode MODE and three operands,
@@ -3375,9 +4653,9 @@ simplify_ternary_operation (enum rtx_code code, enum machine_mode mode,
{
case SIGN_EXTRACT:
case ZERO_EXTRACT:
- if (GET_CODE (op0) == CONST_INT
- && GET_CODE (op1) == CONST_INT
- && GET_CODE (op2) == CONST_INT
+ if (CONST_INT_P (op0)
+ && CONST_INT_P (op1)
+ && CONST_INT_P (op2)
&& ((unsigned) INTVAL (op1) + (unsigned) INTVAL (op2) <= width)
&& width <= (unsigned) HOST_BITS_PER_WIDE_INT)
{
@@ -3414,7 +4692,7 @@ simplify_ternary_operation (enum rtx_code code, enum machine_mode mode,
break;
case IF_THEN_ELSE:
- if (GET_CODE (op0) == CONST_INT)
+ if (CONST_INT_P (op0))
return op0 != const0_rtx ? op1 : op2;
/* Convert c ? a : a into "a". */
@@ -3451,7 +4729,7 @@ simplify_ternary_operation (enum rtx_code code, enum machine_mode mode,
rtx temp;
/* Look for happy constants in op1 and op2. */
- if (GET_CODE (op1) == CONST_INT && GET_CODE (op2) == CONST_INT)
+ if (CONST_INT_P (op1) && CONST_INT_P (op2))
{
HOST_WIDE_INT t = INTVAL (op1);
HOST_WIDE_INT f = INTVAL (op2);
@@ -3482,7 +4760,7 @@ simplify_ternary_operation (enum rtx_code code, enum machine_mode mode,
/* See if any simplifications were possible. */
if (temp)
{
- if (GET_CODE (temp) == CONST_INT)
+ if (CONST_INT_P (temp))
return temp == const0_rtx ? op2 : op1;
else if (temp)
return gen_rtx_IF_THEN_ELSE (mode, temp, op1, op2);
@@ -3495,7 +4773,7 @@ simplify_ternary_operation (enum rtx_code code, enum machine_mode mode,
gcc_assert (GET_MODE (op1) == mode);
gcc_assert (VECTOR_MODE_P (mode));
op2 = avoid_constant_pool_reference (op2);
- if (GET_CODE (op2) == CONST_INT)
+ if (CONST_INT_P (op2))
{
int elt_size = GET_MODE_SIZE (GET_MODE_INNER (mode));
unsigned n_elts = (GET_MODE_SIZE (mode) / elt_size);
@@ -3530,15 +4808,16 @@ simplify_ternary_operation (enum rtx_code code, enum machine_mode mode,
return 0;
}
-/* Evaluate a SUBREG of a CONST_INT or CONST_DOUBLE or CONST_VECTOR,
- returning another CONST_INT or CONST_DOUBLE or CONST_VECTOR.
+/* Evaluate a SUBREG of a CONST_INT or CONST_DOUBLE or CONST_FIXED
+ or CONST_VECTOR,
+ returning another CONST_INT or CONST_DOUBLE or CONST_FIXED or CONST_VECTOR.
Works by unpacking OP into a collection of 8-bit values
represented as a little-endian array of 'unsigned char', selecting by BYTE,
and then repacking them again for OUTERMODE. */
static rtx
-simplify_immed_subreg (enum machine_mode outermode, rtx op,
+simplify_immed_subreg (enum machine_mode outermode, rtx op,
enum machine_mode innermode, unsigned int byte)
{
/* We support up to 512-bit values (for V8DFmode). */
@@ -3561,7 +4840,7 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
enum machine_mode outer_submode;
/* Some ports misuse CCmode. */
- if (GET_MODE_CLASS (outermode) == MODE_CC && GET_CODE (op) == CONST_INT)
+ if (GET_MODE_CLASS (outermode) == MODE_CC && CONST_INT_P (op))
return op;
/* We have no way to represent a complex constant at the rtl level. */
@@ -3586,17 +4865,17 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
gcc_assert (BITS_PER_UNIT % value_bit == 0);
/* I don't know how to handle endianness of sub-units. */
gcc_assert (elem_bitsize % BITS_PER_UNIT == 0);
-
+
for (elem = 0; elem < num_elem; elem++)
{
unsigned char * vp;
rtx el = elems[elem];
-
+
/* Vectors are kept in target memory order. (This is probably
a mistake.) */
{
unsigned byte = (elem * elem_bitsize) / BITS_PER_UNIT;
- unsigned ibyte = (((num_elem - 1 - elem) * elem_bitsize)
+ unsigned ibyte = (((num_elem - 1 - elem) * elem_bitsize)
/ BITS_PER_UNIT);
unsigned word_byte = WORDS_BIG_ENDIAN ? ibyte : byte;
unsigned subword_byte = BYTES_BIG_ENDIAN ? ibyte : byte;
@@ -3604,19 +4883,19 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
+ (word_byte / UNITS_PER_WORD) * UNITS_PER_WORD);
vp = value + (bytele * BITS_PER_UNIT) / value_bit;
}
-
+
switch (GET_CODE (el))
{
case CONST_INT:
for (i = 0;
- i < HOST_BITS_PER_WIDE_INT && i < elem_bitsize;
+ i < HOST_BITS_PER_WIDE_INT && i < elem_bitsize;
i += value_bit)
*vp++ = INTVAL (el) >> i;
/* CONST_INTs are always logically sign-extended. */
for (; i < elem_bitsize; i += value_bit)
*vp++ = INTVAL (el) < 0 ? -1 : 0;
break;
-
+
case CONST_DOUBLE:
if (GET_MODE (el) == VOIDmode)
{
@@ -3642,7 +4921,7 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
long tmp[max_bitsize / 32];
int bitsize = GET_MODE_BITSIZE (GET_MODE (el));
- gcc_assert (GET_MODE_CLASS (GET_MODE (el)) == MODE_FLOAT);
+ gcc_assert (SCALAR_FLOAT_MODE_P (GET_MODE (el)));
gcc_assert (bitsize <= elem_bitsize);
gcc_assert (bitsize % value_bit == 0);
@@ -3662,14 +4941,33 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
ibase = i;
*vp++ = tmp[ibase / 32] >> i % 32;
}
-
+
/* It shouldn't matter what's done here, so fill it with
zero. */
for (; i < elem_bitsize; i += value_bit)
*vp++ = 0;
}
break;
-
+
+ case CONST_FIXED:
+ if (elem_bitsize <= HOST_BITS_PER_WIDE_INT)
+ {
+ for (i = 0; i < elem_bitsize; i += value_bit)
+ *vp++ = CONST_FIXED_VALUE_LOW (el) >> i;
+ }
+ else
+ {
+ for (i = 0; i < HOST_BITS_PER_WIDE_INT; i += value_bit)
+ *vp++ = CONST_FIXED_VALUE_LOW (el) >> i;
+ for (; i < 2 * HOST_BITS_PER_WIDE_INT && i < elem_bitsize;
+ i += value_bit)
+ *vp++ = CONST_FIXED_VALUE_HIGH (el)
+ >> (i - HOST_BITS_PER_WIDE_INT);
+ for (; i < elem_bitsize; i += value_bit)
+ *vp++ = 0;
+ }
+ break;
+
default:
gcc_unreachable ();
}
@@ -3681,7 +4979,7 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
will already have offset 0. */
if (GET_MODE_SIZE (innermode) >= GET_MODE_SIZE (outermode))
{
- unsigned ibyte = (GET_MODE_SIZE (innermode) - GET_MODE_SIZE (outermode)
+ unsigned ibyte = (GET_MODE_SIZE (innermode) - GET_MODE_SIZE (outermode)
- byte);
unsigned word_byte = WORDS_BIG_ENDIAN ? ibyte : byte;
unsigned subword_byte = BYTES_BIG_ENDIAN ? ibyte : byte;
@@ -3697,7 +4995,7 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
value_start = byte * (BITS_PER_UNIT / value_bit);
/* Re-pack the value. */
-
+
if (VECTOR_MODE_P (outermode))
{
num_elem = GET_MODE_NUNITS (outermode);
@@ -3721,12 +5019,12 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
for (elem = 0; elem < num_elem; elem++)
{
unsigned char *vp;
-
+
/* Vectors are stored in target memory order. (This is probably
a mistake.) */
{
unsigned byte = (elem * elem_bitsize) / BITS_PER_UNIT;
- unsigned ibyte = (((num_elem - 1 - elem) * elem_bitsize)
+ unsigned ibyte = (((num_elem - 1 - elem) * elem_bitsize)
/ BITS_PER_UNIT);
unsigned word_byte = WORDS_BIG_ENDIAN ? ibyte : byte;
unsigned subword_byte = BYTES_BIG_ENDIAN ? ibyte : byte;
@@ -3749,7 +5047,7 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
for (; i < elem_bitsize; i += value_bit)
hi |= ((HOST_WIDE_INT)(*vp++ & value_mask)
<< (i - HOST_BITS_PER_WIDE_INT));
-
+
/* immed_double_const doesn't call trunc_int_for_mode. I don't
know why. */
if (elem_bitsize <= HOST_BITS_PER_WIDE_INT)
@@ -3760,12 +5058,13 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
return NULL_RTX;
}
break;
-
+
case MODE_FLOAT:
+ case MODE_DECIMAL_FLOAT:
{
REAL_VALUE_TYPE r;
long tmp[max_bitsize / 32];
-
+
/* real_from_target wants its input in words affected by
FLOAT_WORDS_BIG_ENDIAN. However, we ignore this,
and use WORDS_BIG_ENDIAN instead; see the documentation
@@ -3786,7 +5085,29 @@ simplify_immed_subreg (enum machine_mode outermode, rtx op,
elems[elem] = CONST_DOUBLE_FROM_REAL_VALUE (r, outer_submode);
}
break;
-
+
+ case MODE_FRACT:
+ case MODE_UFRACT:
+ case MODE_ACCUM:
+ case MODE_UACCUM:
+ {
+ FIXED_VALUE_TYPE f;
+ f.data.low = 0;
+ f.data.high = 0;
+ f.mode = outer_submode;
+
+ for (i = 0;
+ i < HOST_BITS_PER_WIDE_INT && i < elem_bitsize;
+ i += value_bit)
+ f.data.low |= (HOST_WIDE_INT)(*vp++ & value_mask) << i;
+ for (; i < elem_bitsize; i += value_bit)
+ f.data.high |= ((HOST_WIDE_INT)(*vp++ & value_mask)
+ << (i - HOST_BITS_PER_WIDE_INT));
+
+ elems[elem] = CONST_FIXED_FROM_FIXED_VALUE (f, outer_submode);
+ }
+ break;
+
default:
gcc_unreachable ();
}
@@ -3818,8 +5139,9 @@ simplify_subreg (enum machine_mode outermode, rtx op,
if (outermode == innermode && !byte)
return op;
- if (GET_CODE (op) == CONST_INT
+ if (CONST_INT_P (op)
|| GET_CODE (op) == CONST_DOUBLE
+ || GET_CODE (op) == CONST_FIXED
|| GET_CODE (op) == CONST_VECTOR)
return simplify_immed_subreg (outermode, op, innermode, byte);
@@ -3892,46 +5214,62 @@ simplify_subreg (enum machine_mode outermode, rtx op,
return newx;
if (validate_subreg (outermode, innermostmode,
SUBREG_REG (op), final_offset))
- return gen_rtx_SUBREG (outermode, SUBREG_REG (op), final_offset);
+ {
+ newx = gen_rtx_SUBREG (outermode, SUBREG_REG (op), final_offset);
+ if (SUBREG_PROMOTED_VAR_P (op)
+ && SUBREG_PROMOTED_UNSIGNED_P (op) >= 0
+ && GET_MODE_CLASS (outermode) == MODE_INT
+ && IN_RANGE (GET_MODE_SIZE (outermode),
+ GET_MODE_SIZE (innermode),
+ GET_MODE_SIZE (innermostmode))
+ && subreg_lowpart_p (newx))
+ {
+ SUBREG_PROMOTED_VAR_P (newx) = 1;
+ SUBREG_PROMOTED_UNSIGNED_SET
+ (newx, SUBREG_PROMOTED_UNSIGNED_P (op));
+ }
+ return newx;
+ }
return NULL_RTX;
}
+ /* Merge implicit and explicit truncations. */
+
+ if (GET_CODE (op) == TRUNCATE
+ && GET_MODE_SIZE (outermode) < GET_MODE_SIZE (innermode)
+ && subreg_lowpart_offset (outermode, innermode) == byte)
+ return simplify_gen_unary (TRUNCATE, outermode, XEXP (op, 0),
+ GET_MODE (XEXP (op, 0)));
+
/* SUBREG of a hard register => just change the register number
and/or mode. If the hard register is not valid in that mode,
suppress this simplification. If the hard register is the stack,
frame, or argument pointer, leave this as a SUBREG. */
- if (REG_P (op)
- && REGNO (op) < FIRST_PSEUDO_REGISTER
-#ifdef CANNOT_CHANGE_MODE_CLASS
- && ! (REG_CANNOT_CHANGE_MODE_P (REGNO (op), innermode, outermode)
- && GET_MODE_CLASS (innermode) != MODE_COMPLEX_INT
- && GET_MODE_CLASS (innermode) != MODE_COMPLEX_FLOAT)
-#endif
- && ((reload_completed && !frame_pointer_needed)
- || (REGNO (op) != FRAME_POINTER_REGNUM
-#if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
- && REGNO (op) != HARD_FRAME_POINTER_REGNUM
-#endif
- ))
-#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
- && REGNO (op) != ARG_POINTER_REGNUM
-#endif
- && REGNO (op) != STACK_POINTER_REGNUM
- && subreg_offset_representable_p (REGNO (op), innermode,
- byte, outermode))
+ if (REG_P (op) && HARD_REGISTER_P (op))
{
- unsigned int regno = REGNO (op);
- unsigned int final_regno
- = regno + subreg_regno_offset (regno, innermode, byte, outermode);
-
- /* ??? We do allow it if the current REG is not valid for
- its mode. This is a kludge to work around how float/complex
- arguments are passed on 32-bit SPARC and should be fixed. */
- if (HARD_REGNO_MODE_OK (final_regno, outermode)
- || ! HARD_REGNO_MODE_OK (regno, innermode))
+ unsigned int regno, final_regno;
+
+ regno = REGNO (op);
+ final_regno = simplify_subreg_regno (regno, innermode, byte, outermode);
+ if (HARD_REGISTER_NUM_P (final_regno))
{
- rtx x = gen_rtx_REG_offset (op, outermode, final_regno, byte);
+ rtx x;
+ int final_offset = byte;
+
+ /* Adjust offset for paradoxical subregs. */
+ if (byte == 0
+ && GET_MODE_SIZE (innermode) < GET_MODE_SIZE (outermode))
+ {
+ int difference = (GET_MODE_SIZE (innermode)
+ - GET_MODE_SIZE (outermode));
+ if (WORDS_BIG_ENDIAN)
+ final_offset += (difference / UNITS_PER_WORD) * UNITS_PER_WORD;
+ if (BYTES_BIG_ENDIAN)
+ final_offset += difference % UNITS_PER_WORD;
+ }
+
+ x = gen_rtx_REG_offset (op, outermode, final_regno, final_offset);
/* Propagate original regno. We don't have any way to specify
the offset inside original regno, so do so only for lowpart.
@@ -3962,13 +5300,22 @@ simplify_subreg (enum machine_mode outermode, rtx op,
of real and imaginary part. */
if (GET_CODE (op) == CONCAT)
{
- unsigned int inner_size, final_offset;
+ unsigned int part_size, final_offset;
rtx part, res;
- inner_size = GET_MODE_UNIT_SIZE (innermode);
- part = byte < inner_size ? XEXP (op, 0) : XEXP (op, 1);
- final_offset = byte % inner_size;
- if (final_offset + GET_MODE_SIZE (outermode) > inner_size)
+ part_size = GET_MODE_UNIT_SIZE (GET_MODE (XEXP (op, 0)));
+ if (byte < part_size)
+ {
+ part = XEXP (op, 0);
+ final_offset = byte;
+ }
+ else
+ {
+ part = XEXP (op, 1);
+ final_offset = byte - part_size;
+ }
+
+ if (final_offset + GET_MODE_SIZE (outermode) > part_size)
return NULL_RTX;
res = simplify_subreg (outermode, part, GET_MODE (part), final_offset);
@@ -4025,7 +5372,7 @@ simplify_subreg (enum machine_mode outermode, rtx op,
than the sign extension's sign_bit_copies and introduces zeros
into the high bits of the result. */
&& (2 * GET_MODE_BITSIZE (outermode)) <= GET_MODE_BITSIZE (innermode)
- && GET_CODE (XEXP (op, 1)) == CONST_INT
+ && CONST_INT_P (XEXP (op, 1))
&& GET_CODE (XEXP (op, 0)) == SIGN_EXTEND
&& GET_MODE (XEXP (XEXP (op, 0), 0)) == outermode
&& INTVAL (XEXP (op, 1)) < GET_MODE_BITSIZE (outermode)
@@ -4040,7 +5387,7 @@ simplify_subreg (enum machine_mode outermode, rtx op,
|| GET_CODE (op) == ASHIFTRT)
&& SCALAR_INT_MODE_P (outermode)
&& GET_MODE_BITSIZE (outermode) < GET_MODE_BITSIZE (innermode)
- && GET_CODE (XEXP (op, 1)) == CONST_INT
+ && CONST_INT_P (XEXP (op, 1))
&& GET_CODE (XEXP (op, 0)) == ZERO_EXTEND
&& GET_MODE (XEXP (XEXP (op, 0), 0)) == outermode
&& INTVAL (XEXP (op, 1)) < GET_MODE_BITSIZE (outermode)
@@ -4054,7 +5401,7 @@ simplify_subreg (enum machine_mode outermode, rtx op,
if (GET_CODE (op) == ASHIFT
&& SCALAR_INT_MODE_P (outermode)
&& GET_MODE_BITSIZE (outermode) < GET_MODE_BITSIZE (innermode)
- && GET_CODE (XEXP (op, 1)) == CONST_INT
+ && CONST_INT_P (XEXP (op, 1))
&& (GET_CODE (XEXP (op, 0)) == ZERO_EXTEND
|| GET_CODE (XEXP (op, 0)) == SIGN_EXTEND)
&& GET_MODE (XEXP (XEXP (op, 0), 0)) == outermode
@@ -4063,6 +5410,25 @@ simplify_subreg (enum machine_mode outermode, rtx op,
return simplify_gen_binary (ASHIFT, outermode,
XEXP (XEXP (op, 0), 0), XEXP (op, 1));
+ /* Recognize a word extraction from a multi-word subreg. */
+ if ((GET_CODE (op) == LSHIFTRT
+ || GET_CODE (op) == ASHIFTRT)
+ && SCALAR_INT_MODE_P (outermode)
+ && GET_MODE_BITSIZE (outermode) >= BITS_PER_WORD
+ && GET_MODE_BITSIZE (innermode) >= (2 * GET_MODE_BITSIZE (outermode))
+ && CONST_INT_P (XEXP (op, 1))
+ && (INTVAL (XEXP (op, 1)) & (GET_MODE_BITSIZE (outermode) - 1)) == 0
+ && INTVAL (XEXP (op, 1)) >= 0
+ && INTVAL (XEXP (op, 1)) < GET_MODE_BITSIZE (innermode)
+ && byte == subreg_lowpart_offset (outermode, innermode))
+ {
+ int shifted_bytes = INTVAL (XEXP (op, 1)) / BITS_PER_UNIT;
+ return simplify_gen_subreg (outermode, XEXP (op, 0), innermode,
+ (WORDS_BIG_ENDIAN
+ ? byte - shifted_bytes
+ : byte + shifted_bytes));
+ }
+
return NULL_RTX;
}
@@ -4130,10 +5496,10 @@ simplify_gen_subreg (enum machine_mode outermode, rtx op,
simplification and 1 for tree simplification. */
rtx
-simplify_rtx (rtx x)
+simplify_rtx (const_rtx x)
{
- enum rtx_code code = GET_CODE (x);
- enum machine_mode mode = GET_MODE (x);
+ const enum rtx_code code = GET_CODE (x);
+ const enum machine_mode mode = GET_MODE (x);
switch (GET_RTX_CLASS (code))
{
@@ -4167,9 +5533,9 @@ simplify_rtx (rtx x)
case RTX_EXTRA:
if (code == SUBREG)
- return simplify_gen_subreg (mode, SUBREG_REG (x),
- GET_MODE (SUBREG_REG (x)),
- SUBREG_BYTE (x));
+ return simplify_subreg (mode, SUBREG_REG (x),
+ GET_MODE (SUBREG_REG (x)),
+ SUBREG_BYTE (x));
break;
case RTX_OBJ: