/* 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, 2006 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
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
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "flags.h"
-#include "real.h"
#include "insn-config.h"
#include "recog.h"
#include "function.h"
#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 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);
/* 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);
}
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;
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
return x;
}
+ if (GET_MODE (x) == BLKmode)
+ return x;
+
addr = XEXP (x, 0);
/* Call target hook to avoid the effects of -fpic etc.... */
/* 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);
return x;
}
+\f
+/* 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;
}
\f
/* Make a unary operation by first seeing if it folds and otherwise making
return gen_rtx_fmt_ee (code, mode, op0, op1);
}
\f
-/* 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);
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);
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)
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,
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))
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);
}
\f
/* Try to simplify a unary operation CODE whose output mode is to be
{
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);
/* (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)
/* (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) == 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
&& !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);
/* (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));
/* (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
/* (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)
+ && 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);
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 ...))
+ 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),
/* (float_truncate (float x)) is (float x) */
if (GET_CODE (op) == FLOAT
&& (flag_unsafe_math_optimizations
- || ((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)))))))
+ || (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)));
*/
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),
break;
case POPCOUNT:
+ switch (GET_CODE (op))
+ {
+ case BSWAP:
+ case ZERO_EXTEND:
+ /* (popcount (zero_extend <X>)) = (popcount <X>) */
+ 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:
- /* (pop* (zero_extend <X>)) = (pop* <X>) */
- if (GET_CODE (op) == ZERO_EXTEND)
- return simplify_gen_unary (code, mode, XEXP (op, 0),
- GET_MODE (XEXP (op, 0)));
+ 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:
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
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
default:
break;
}
-
+
return 0;
}
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));
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);
}
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);
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);
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;
case FLOAT_TRUNCATE:
case SS_TRUNCATE:
case US_TRUNCATE:
+ case SS_NEG:
+ case US_NEG:
+ case SS_ABS:
return 0;
default:
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;
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;
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);
}
/* 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));
}
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)
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
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);
}
{
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),
XEXP (op0, 1)));
/* Canonicalize (plus (mult (neg B) C) A) to (minus A (mult B C)). */
- if (GET_CODE (op0) == MULT
+ if (!HONOR_SIGN_DEPENDENT_ROUNDING (mode)
+ && GET_CODE (op0) == MULT
&& GET_CODE (XEXP (op0, 0)) == NEG)
{
rtx in1, in2;
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)
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))
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
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);
}
{
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;
}
}
/* (-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);
}
/* 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));
return reversed;
/* Canonicalize (minus A (mult (neg B) C)) to (plus (mult B C) A). */
- if (GET_CODE (op1) == MULT
+ if (!HONOR_SIGN_DEPENDENT_ROUNDING (mode)
+ && GET_CODE (op1) == MULT
&& GET_CODE (XEXP (op1, 0)) == NEG)
{
rtx in1, in2;
/* Canonicalize (minus (neg A) (mult B C)) to
(minus (mult (neg B) C) A). */
- if (GET_CODE (op1) == MULT
+ if (!HONOR_SIGN_DEPENDENT_ROUNDING (mode)
+ && GET_CODE (op1) == MULT
&& GET_CODE (op0) == NEG)
{
rtx in1, in2;
/* 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
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
&& SCALAR_FLOAT_MODE_P (GET_MODE (trueop1))
+ && !DECIMAL_FLOAT_MODE_P (GET_MODE (trueop1))
&& GET_MODE (op0) == mode)
{
REAL_VALUE_TYPE d;
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)
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;
return constm1_rtx;
/* (ior A C) is C if all bits of A that might be nonzero are on in C. */
- if (GET_CODE (op1) == CONST_INT
+ 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)
if (GET_CODE (opleft) == ASHIFT && GET_CODE (opright) == LSHIFTRT
&& rtx_equal_p (XEXP (opleft, 0), XEXP (opright, 0))
- && GET_CODE (XEXP (opleft, 1)) == CONST_INT
- && GET_CODE (XEXP (opright, 1)) == CONST_INT
+ && 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));
< GET_MODE_SIZE (GET_MODE (SUBREG_REG (opleft))))
&& rtx_equal_p (XEXP (SUBREG_REG (opleft), 0),
SUBREG_REG (XEXP (opright, 0)))
- && GET_CODE (XEXP (SUBREG_REG (opleft), 1)) == CONST_INT
- && GET_CODE (XEXP (opright, 1)) == CONST_INT
+ && 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),
/* If we have (ior (and (X C1) C2)), simplify this by making
C1 as small as possible if C1 actually changes. */
- if (GET_CODE (op1) == CONST_INT
+ if (CONST_INT_P (op1)
&& (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
|| INTVAL (op1) > 0)
&& GET_CODE (op0) == AND
- && GET_CODE (XEXP (op0, 1)) == CONST_INT
- && GET_CODE (op1) == CONST_INT
+ && 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
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 (GET_CODE (trueop1) == CONST_INT && GET_CODE (op0) == ASHIFTRT
+ if (CONST_INT_P (trueop1) && GET_CODE (op0) == ASHIFTRT
&& GET_CODE (XEXP (op0, 0)) == PLUS
- && GET_CODE (XEXP (XEXP (op0, 0), 1)) == CONST_INT
- && GET_CODE (XEXP (op0, 1)) == CONST_INT
+ && 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));
case XOR:
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 simplify_gen_unary (NOT, mode, op0, mode);
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),
if (STORE_FLAG_VALUE == 1
&& trueop1 == const1_rtx
&& GET_CODE (op0) == LSHIFTRT
- && GET_CODE (XEXP (op0, 1)) == CONST_INT
+ && 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);
&& (reversed = reversed_comparison (op0, mode)))
return reversed;
- break;
-
tem = simplify_associative_operation (code, mode, op0, op1);
if (tem)
return tem;
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;
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)
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
((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
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;
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;
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;
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);
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));
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;
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))
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;
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
{
{
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));
}
}
if (XVECLEN (trueop1, 0) == 1
- && GET_CODE (XVECEXP (trueop1, 0, 0)) == CONST_INT
+ && CONST_INT_P (XVECEXP (trueop1, 0, 0))
&& GET_CODE (trueop0) == VEC_CONCAT)
{
rtx vec = trueop0;
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));
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);
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;
/* 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;
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:
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)
return 0;
val = arg0s / arg1s;
break;
-
+
case MOD:
if (arg1s == 0
|| (arg0s == (HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1)
return 0;
val = arg0s % arg1s;
break;
-
+
case UDIV:
if (arg1 == 0
|| (arg0s == (HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1)
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)
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:
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 ();
}
{
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
struct simplify_plus_minus_op_data ops[8];
rtx result, tem;
int n_ops = 2, input_ops = 2;
- int first, changed, canonicalized = 0;
+ int changed, n_constants = 0, canonicalized = 0;
int i, j;
memset (ops, 0, sizeof ops);
break;
case CONST_INT:
+ n_constants++;
if (this_neg)
{
ops[i].op = neg_const_int (mode, this_op);
}
while (changed);
- gcc_assert (n_ops >= 2);
- if (!canonicalized)
- {
- int n_constants = 0;
+ if (n_constants > 1)
+ canonicalized = 1;
- for (i = 0; i < n_ops; i++)
- if (GET_CODE (ops[i].op) == CONST_INT)
- n_constants++;
-
- if (n_constants <= 1)
- return NULL_RTX;
- }
+ gcc_assert (n_ops >= 2);
/* If we only have two operands, we can avoid the loops. */
if (n_ops == 2)
return simplify_const_binary_operation (code, mode, lhs, rhs);
}
- /* Now simplify each pair of operands until nothing changes. The first
- time through just simplify constants against each other. */
-
- 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;
else if (swap_commutative_operands_p (lhs, rhs))
tem = lhs, lhs = rhs, rhs = tem;
- if ((GET_CODE (lhs) == CONST || GET_CODE (lhs) == CONST_INT)
- && (GET_CODE (rhs) == CONST || GET_CODE (rhs) == CONST_INT))
+ if ((GET_CODE (lhs) == CONST || CONST_INT_P (lhs))
+ && (GET_CODE (rhs) == CONST || CONST_INT_P (rhs)))
{
rtx tem_lhs, tem_rhs;
}
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
in infinite recursion with simplify_binary_operation
&& ! (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
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;
/* 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
}
#else
return NULL_RTX;
-#endif
+#endif
}
if (VECTOR_MODE_P (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 (GET_MODE_CLASS (cmp_mode) == MODE_CC
|| CC0_P (op0))
{
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
- from 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)
&& (op0code == PLUS || op0code == MINUS)
return simplify_gen_relational (code, mode, cmp_mode,
XEXP (op0, 0), XEXP (op0, 1));
- /* (eq/ne (xor x y) x) simplifies to (eq/ne x 0). */
+ /* (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, 1)))
- return simplify_gen_relational (code, mode, cmp_mode, op1, const0_rtx);
- /* Likewise (eq/ne (xor x y) y) simplifies to (eq/ne y 0). */
+ && !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, 0)))
- return simplify_gen_relational (code, mode, cmp_mode, op1, const0_rtx);
+ && !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
- && (GET_CODE (op1) == CONST_INT
+ && (CONST_INT_P (op1)
|| GET_CODE (op1) == CONST_DOUBLE)
- && (GET_CODE (XEXP (op0, 1)) == CONST_INT
+ && (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.
enum machine_mode mode,
rtx op0, rtx op1)
{
- int equal, op0lt, op0ltu, op1lt, op1ltu;
rtx tem;
rtx trueop0;
rtx trueop1;
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
- && SCALAR_FLOAT_MODE_P (GET_MODE (trueop0)))
+ if (GET_CODE (trueop0) == CONST_DOUBLE
+ && GET_CODE (trueop1) == CONST_DOUBLE
+ && SCALAR_FLOAT_MODE_P (GET_MODE (trueop0)))
{
REAL_VALUE_TYPE d0, d1;
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;
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;
-
- case LTU:
- case LT:
- /* x < min is always false. */
- if (rtx_equal_p (trueop1, mmin))
- tem = const0_rtx;
- break;
+ unsigned int sign_copies = num_sign_bit_copies (trueop0, mode);
- 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;
}
\f
/* Simplify CODE, an operation with result mode MODE and three operands,
{
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)
{
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". */
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);
/* 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);
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);
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). */
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. */
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;
+ (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)
{
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 ();
}
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;
value_start = byte * (BITS_PER_UNIT / value_bit);
/* Re-pack the value. */
-
+
if (VECTOR_MODE_P (outermode))
{
num_elem = GET_MODE_NUNITS (outermode);
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;
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)
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
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 ();
}
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);
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;
}
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.
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);
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)
|| 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)
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
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;
}
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))
{
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:
}
return NULL;
}
-
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