-/* Common subexpression elimination for GNU compiler.
- Copyright (C) 1987, 88, 89, 92-7, 1998, 1999 Free Software Foundation, Inc.
+/* RTL simplification functions for GNU compiler.
+ Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000, 2001 Free Software Foundation, Inc.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC 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 version.
+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
+version.
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+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 GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+along with GCC; see the file COPYING. If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA. */
#include "config.h"
-/* stdio.h must precede rtl.h for FFS. */
#include "system.h"
-#include <setjmp.h>
#include "rtl.h"
#include "tm_p.h"
#include "expr.h"
#include "toplev.h"
#include "output.h"
+#include "ggc.h"
/* Simplification and canonicalization of RTL. */
|| XEXP (X, 0) == virtual_outgoing_args_rtx)) \
|| GET_CODE (X) == ADDRESSOF)
+/* Much code operates on (low, high) pairs; the low value is an
+ unsigned wide int, the high value a signed wide int. We
+ occasionally need to sign extend from low to high as if low were a
+ signed wide int. */
+#define HWI_SIGN_EXTEND(low) \
+ ((((HOST_WIDE_INT) low) < 0) ? ((HOST_WIDE_INT) -1) : ((HOST_WIDE_INT) 0))
+
+static rtx neg_const_int PARAMS ((enum machine_mode, rtx));
+static int simplify_plus_minus_op_data_cmp PARAMS ((const void *,
+ const void *));
+static rtx simplify_plus_minus PARAMS ((enum rtx_code,
+ enum machine_mode, rtx, rtx));
+static void check_fold_consts PARAMS ((PTR));
+#if ! defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
+static void simplify_unary_real PARAMS ((PTR));
+static void simplify_binary_real PARAMS ((PTR));
+#endif
+static void simplify_binary_is2orm1 PARAMS ((PTR));
-static rtx simplify_plus_minus PROTO((enum rtx_code, enum machine_mode,
- rtx, rtx));
-static void check_fold_consts PROTO((PTR));
+\f
+/* Negate a CONST_INT rtx, truncating (because a conversion from a
+ maximally negative number can overflow). */
+static rtx
+neg_const_int (mode, i)
+ enum machine_mode mode;
+ rtx i;
+{
+ return GEN_INT (trunc_int_for_mode (- INTVAL (i), mode));
+}
+\f
/* Make a binary operation by properly ordering the operands and
seeing if the expression folds. */
/* Put complex operands first and constants second if commutative. */
if (GET_RTX_CLASS (code) == 'c'
- && ((CONSTANT_P (op0) && GET_CODE (op1) != CONST_INT)
- || (GET_RTX_CLASS (GET_CODE (op0)) == 'o'
- && GET_RTX_CLASS (GET_CODE (op1)) != 'o')
- || (GET_CODE (op0) == SUBREG
- && GET_RTX_CLASS (GET_CODE (SUBREG_REG (op0))) == 'o'
- && GET_RTX_CLASS (GET_CODE (op1)) != 'o')))
+ && swap_commutative_operands_p (op0, op1))
tem = op0, op0 = op1, op1 = tem;
/* If this simplifies, do it. */
/* Handle addition and subtraction of CONST_INT specially. Otherwise,
just form the operation. */
- if (code == PLUS && GET_CODE (op1) == CONST_INT
- && GET_MODE (op0) != VOIDmode)
- return plus_constant (op0, INTVAL (op1));
- else if (code == MINUS && GET_CODE (op1) == CONST_INT
- && GET_MODE (op0) != VOIDmode)
- return plus_constant (op0, - INTVAL (op1));
+ if (GET_CODE (op1) == CONST_INT
+ && GET_MODE (op0) != VOIDmode
+ && (code == PLUS || code == MINUS))
+ {
+ if (code == MINUS)
+ op1 = neg_const_int (mode, op1);
+ return plus_constant (op0, INTVAL (op1));
+ }
else
return gen_rtx_fmt_ee (code, mode, op0, op1);
}
\f
+/* If X is a MEM referencing the constant pool, return the real value.
+ Otherwise return X. */
+rtx
+avoid_constant_pool_reference (x)
+ rtx x;
+{
+ rtx c, addr;
+ enum machine_mode cmode;
+
+ if (GET_CODE (x) != MEM)
+ return x;
+ addr = XEXP (x, 0);
+
+ if (GET_CODE (addr) != SYMBOL_REF
+ || ! CONSTANT_POOL_ADDRESS_P (addr))
+ return x;
+
+ c = get_pool_constant (addr);
+ cmode = get_pool_mode (addr);
+
+ /* If we're accessing the constant in a different mode than it was
+ originally stored, attempt to fix that up via subreg simplifications.
+ If that fails we have no choice but to return the original memory. */
+ if (cmode != GET_MODE (x))
+ {
+ c = simplify_subreg (GET_MODE (x), c, cmode, 0);
+ return c ? c : x;
+ }
+
+ return c;
+}
+\f
+/* Make a unary operation by first seeing if it folds and otherwise making
+ the specified operation. */
+
+rtx
+simplify_gen_unary (code, mode, op, op_mode)
+ enum rtx_code code;
+ enum machine_mode mode;
+ rtx op;
+ enum machine_mode op_mode;
+{
+ rtx tem;
+
+ /* If this simplifies, use it. */
+ if ((tem = simplify_unary_operation (code, mode, op, op_mode)) != 0)
+ return tem;
+
+ return gen_rtx_fmt_e (code, mode, op);
+}
+
+/* Likewise for ternary operations. */
+
+rtx
+simplify_gen_ternary (code, mode, op0_mode, op0, op1, op2)
+ enum rtx_code code;
+ enum machine_mode mode, op0_mode;
+ rtx op0, op1, op2;
+{
+ rtx tem;
+
+ /* If this simplifies, use it. */
+ if (0 != (tem = simplify_ternary_operation (code, mode, op0_mode,
+ op0, op1, op2)))
+ return tem;
+
+ return gen_rtx_fmt_eee (code, mode, op0, op1, op2);
+}
+\f
+/* Likewise, for relational operations.
+ CMP_MODE specifies mode comparison is done in.
+ */
+
+rtx
+simplify_gen_relational (code, mode, cmp_mode, op0, op1)
+ enum rtx_code code;
+ enum machine_mode mode;
+ enum machine_mode cmp_mode;
+ rtx op0, op1;
+{
+ rtx tem;
+
+ if ((tem = simplify_relational_operation (code, cmp_mode, op0, op1)) != 0)
+ return tem;
+
+ /* Put complex operands first and constants second. */
+ if (swap_commutative_operands_p (op0, op1))
+ tem = op0, op0 = op1, op1 = tem, code = swap_condition (code);
+
+ return gen_rtx_fmt_ee (code, mode, op0, op1);
+}
+\f
+/* Replace all occurrences of OLD in X with NEW and try to simplify the
+ resulting RTX. Return a new RTX which is as simplified as possible. */
+
+rtx
+simplify_replace_rtx (x, old, new)
+ rtx x;
+ rtx old;
+ rtx new;
+{
+ enum rtx_code code = GET_CODE (x);
+ enum machine_mode mode = GET_MODE (x);
+
+ /* If X is OLD, return NEW. Otherwise, if this is an expression, try
+ to build a new expression substituting recursively. If we can't do
+ anything, return our input. */
+
+ if (x == old)
+ return new;
+
+ switch (GET_RTX_CLASS (code))
+ {
+ case '1':
+ {
+ enum machine_mode op_mode = GET_MODE (XEXP (x, 0));
+ rtx op = (XEXP (x, 0) == old
+ ? new : simplify_replace_rtx (XEXP (x, 0), old, new));
+
+ return simplify_gen_unary (code, mode, op, op_mode);
+ }
+
+ case '2':
+ case 'c':
+ return
+ simplify_gen_binary (code, mode,
+ simplify_replace_rtx (XEXP (x, 0), old, new),
+ simplify_replace_rtx (XEXP (x, 1), old, new));
+ case '<':
+ {
+ enum machine_mode op_mode = (GET_MODE (XEXP (x, 0)) != VOIDmode
+ ? GET_MODE (XEXP (x, 0))
+ : GET_MODE (XEXP (x, 1)));
+ rtx op0 = simplify_replace_rtx (XEXP (x, 0), old, new);
+ rtx op1 = simplify_replace_rtx (XEXP (x, 1), old, new);
+
+ return
+ simplify_gen_relational (code, mode,
+ (op_mode != VOIDmode
+ ? op_mode
+ : GET_MODE (op0) != VOIDmode
+ ? GET_MODE (op0)
+ : GET_MODE (op1)),
+ op0, op1);
+ }
+
+ case '3':
+ case 'b':
+ {
+ enum machine_mode op_mode = GET_MODE (XEXP (x, 0));
+ rtx op0 = simplify_replace_rtx (XEXP (x, 0), old, new);
+
+ return
+ simplify_gen_ternary (code, mode,
+ (op_mode != VOIDmode
+ ? op_mode
+ : GET_MODE (op0)),
+ op0,
+ simplify_replace_rtx (XEXP (x, 1), old, new),
+ simplify_replace_rtx (XEXP (x, 2), old, new));
+ }
+
+ case 'x':
+ /* The only case we try to handle is a SUBREG. */
+ if (code == SUBREG)
+ {
+ rtx exp;
+ exp = simplify_gen_subreg (GET_MODE (x),
+ simplify_replace_rtx (SUBREG_REG (x),
+ old, new),
+ GET_MODE (SUBREG_REG (x)),
+ SUBREG_BYTE (x));
+ if (exp)
+ x = exp;
+ }
+ return x;
+
+ default:
+ if (GET_CODE (x) == MEM)
+ return
+ replace_equiv_address_nv (x,
+ simplify_replace_rtx (XEXP (x, 0),
+ old, new));
+
+ return x;
+ }
+ return x;
+}
+\f
+#if ! defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
+/* Subroutine of simplify_unary_operation, called via do_float_handler.
+ Handles simplification of unary ops on floating point values. */
+struct simplify_unary_real_args
+{
+ rtx operand;
+ rtx result;
+ enum machine_mode mode;
+ enum rtx_code code;
+ bool want_integer;
+};
+#define REAL_VALUE_ABS(d_) \
+ (REAL_VALUE_NEGATIVE (d_) ? REAL_VALUE_NEGATE (d_) : (d_))
+
+static void
+simplify_unary_real (p)
+ PTR p;
+{
+ REAL_VALUE_TYPE d;
+
+ struct simplify_unary_real_args *args =
+ (struct simplify_unary_real_args *) p;
+
+ REAL_VALUE_FROM_CONST_DOUBLE (d, args->operand);
+
+ if (args->want_integer)
+ {
+ HOST_WIDE_INT i;
+
+ switch (args->code)
+ {
+ case FIX: i = REAL_VALUE_FIX (d); break;
+ case UNSIGNED_FIX: i = REAL_VALUE_UNSIGNED_FIX (d); break;
+ default:
+ abort ();
+ }
+ args->result = GEN_INT (trunc_int_for_mode (i, args->mode));
+ }
+ else
+ {
+ switch (args->code)
+ {
+ case SQRT:
+ /* We don't attempt to optimize this. */
+ args->result = 0;
+ return;
+
+ case ABS: d = REAL_VALUE_ABS (d); break;
+ case NEG: d = REAL_VALUE_NEGATE (d); break;
+ case FLOAT_TRUNCATE: d = real_value_truncate (args->mode, d); break;
+ case FLOAT_EXTEND: /* All this does is change the mode. */ break;
+ case FIX: d = REAL_VALUE_RNDZINT (d); break;
+ case UNSIGNED_FIX: d = REAL_VALUE_UNSIGNED_RNDZINT (d); break;
+ default:
+ abort ();
+ }
+ args->result = CONST_DOUBLE_FROM_REAL_VALUE (d, args->mode);
+ }
+}
+#endif
+
/* Try to simplify a unary operation CODE whose output mode is to be
MODE with input operand OP whose mode was originally OP_MODE.
Return zero if no simplification can be made. */
-
rtx
simplify_unary_operation (code, mode, op, op_mode)
enum rtx_code code;
rtx op;
enum machine_mode op_mode;
{
- register int width = GET_MODE_BITSIZE (mode);
+ unsigned int width = GET_MODE_BITSIZE (mode);
+ rtx trueop = avoid_constant_pool_reference (op);
/* The order of these tests is critical so that, for example, we don't
check the wrong mode (input vs. output) for a conversion operation,
#if !defined(REAL_IS_NOT_DOUBLE) || defined(REAL_ARITHMETIC)
- if (code == FLOAT && GET_MODE (op) == VOIDmode
- && (GET_CODE (op) == CONST_DOUBLE || GET_CODE (op) == CONST_INT))
+ if (code == FLOAT && GET_MODE (trueop) == VOIDmode
+ && (GET_CODE (trueop) == CONST_DOUBLE || GET_CODE (trueop) == CONST_INT))
{
HOST_WIDE_INT hv, lv;
REAL_VALUE_TYPE d;
- if (GET_CODE (op) == CONST_INT)
- lv = INTVAL (op), hv = INTVAL (op) < 0 ? -1 : 0;
+ if (GET_CODE (trueop) == CONST_INT)
+ lv = INTVAL (trueop), hv = HWI_SIGN_EXTEND (lv);
else
- lv = CONST_DOUBLE_LOW (op), hv = CONST_DOUBLE_HIGH (op);
+ lv = CONST_DOUBLE_LOW (trueop), hv = CONST_DOUBLE_HIGH (trueop);
#ifdef REAL_ARITHMETIC
REAL_VALUE_FROM_INT (d, lv, hv, mode);
d = real_value_truncate (mode, d);
return CONST_DOUBLE_FROM_REAL_VALUE (d, mode);
}
- else if (code == UNSIGNED_FLOAT && GET_MODE (op) == VOIDmode
- && (GET_CODE (op) == CONST_DOUBLE || GET_CODE (op) == CONST_INT))
+ else if (code == UNSIGNED_FLOAT && GET_MODE (trueop) == VOIDmode
+ && (GET_CODE (trueop) == CONST_DOUBLE
+ || GET_CODE (trueop) == CONST_INT))
{
HOST_WIDE_INT hv, lv;
REAL_VALUE_TYPE d;
- if (GET_CODE (op) == CONST_INT)
- lv = INTVAL (op), hv = INTVAL (op) < 0 ? -1 : 0;
+ if (GET_CODE (trueop) == CONST_INT)
+ lv = INTVAL (trueop), hv = HWI_SIGN_EXTEND (lv);
else
- lv = CONST_DOUBLE_LOW (op), hv = CONST_DOUBLE_HIGH (op);
+ lv = CONST_DOUBLE_LOW (trueop), hv = CONST_DOUBLE_HIGH (trueop);
if (op_mode == VOIDmode)
{
}
#endif
- if (GET_CODE (op) == CONST_INT
+ if (GET_CODE (trueop) == CONST_INT
&& width <= HOST_BITS_PER_WIDE_INT && width > 0)
{
- register HOST_WIDE_INT arg0 = INTVAL (op);
- register HOST_WIDE_INT val;
+ HOST_WIDE_INT arg0 = INTVAL (trueop);
+ HOST_WIDE_INT val;
switch (code)
{
break;
case SQRT:
+ case FLOAT_EXTEND:
+ case FLOAT_TRUNCATE:
+ case SS_TRUNCATE:
+ case US_TRUNCATE:
return 0;
default:
/* We can do some operations on integer CONST_DOUBLEs. Also allow
for a DImode operation on a CONST_INT. */
- else if (GET_MODE (op) == VOIDmode && width <= HOST_BITS_PER_INT * 2
- && (GET_CODE (op) == CONST_DOUBLE || GET_CODE (op) == CONST_INT))
+ else if (GET_MODE (trueop) == VOIDmode && width <= HOST_BITS_PER_INT * 2
+ && (GET_CODE (trueop) == CONST_DOUBLE
+ || GET_CODE (trueop) == CONST_INT))
{
- HOST_WIDE_INT l1, h1, lv, hv;
+ unsigned HOST_WIDE_INT l1, lv;
+ HOST_WIDE_INT h1, hv;
- if (GET_CODE (op) == CONST_DOUBLE)
- l1 = CONST_DOUBLE_LOW (op), h1 = CONST_DOUBLE_HIGH (op);
+ if (GET_CODE (trueop) == CONST_DOUBLE)
+ l1 = CONST_DOUBLE_LOW (trueop), h1 = CONST_DOUBLE_HIGH (trueop);
else
- l1 = INTVAL (op), h1 = l1 < 0 ? -1 : 0;
+ l1 = INTVAL (trueop), h1 = HWI_SIGN_EXTEND (l1);
switch (code)
{
<< (GET_MODE_BITSIZE (op_mode) - 1))) != 0)
lv -= (HOST_WIDE_INT) 1 << GET_MODE_BITSIZE (op_mode);
- hv = (lv < 0) ? ~ (HOST_WIDE_INT) 0 : 0;
+ hv = HWI_SIGN_EXTEND (lv);
}
break;
}
#if ! defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
- else if (GET_CODE (op) == CONST_DOUBLE
+ else if (GET_CODE (trueop) == CONST_DOUBLE
&& GET_MODE_CLASS (mode) == MODE_FLOAT)
{
- REAL_VALUE_TYPE d;
- jmp_buf handler;
- rtx x;
-
- if (setjmp (handler))
- /* There used to be a warning here, but that is inadvisable.
- People may want to cause traps, and the natural way
- to do it should not get a warning. */
- return 0;
-
- set_float_handler (handler);
-
- REAL_VALUE_FROM_CONST_DOUBLE (d, op);
-
- switch (code)
- {
- case NEG:
- d = REAL_VALUE_NEGATE (d);
- break;
-
- case ABS:
- if (REAL_VALUE_NEGATIVE (d))
- d = REAL_VALUE_NEGATE (d);
- break;
-
- case FLOAT_TRUNCATE:
- d = real_value_truncate (mode, d);
- break;
+ struct simplify_unary_real_args args;
+ args.operand = trueop;
+ args.mode = mode;
+ args.code = code;
+ args.want_integer = false;
- case FLOAT_EXTEND:
- /* All this does is change the mode. */
- break;
-
- case FIX:
- d = REAL_VALUE_RNDZINT (d);
- break;
+ if (do_float_handler (simplify_unary_real, (PTR) &args))
+ return args.result;
- case UNSIGNED_FIX:
- d = REAL_VALUE_UNSIGNED_RNDZINT (d);
- break;
-
- case SQRT:
- return 0;
-
- default:
- abort ();
- }
-
- x = CONST_DOUBLE_FROM_REAL_VALUE (d, mode);
- set_float_handler (NULL_PTR);
- return x;
+ return 0;
}
- else if (GET_CODE (op) == CONST_DOUBLE
- && GET_MODE_CLASS (GET_MODE (op)) == MODE_FLOAT
+ else if (GET_CODE (trueop) == CONST_DOUBLE
+ && GET_MODE_CLASS (GET_MODE (trueop)) == MODE_FLOAT
&& GET_MODE_CLASS (mode) == MODE_INT
&& width <= HOST_BITS_PER_WIDE_INT && width > 0)
{
- REAL_VALUE_TYPE d;
- jmp_buf handler;
- HOST_WIDE_INT val;
-
- if (setjmp (handler))
- return 0;
-
- set_float_handler (handler);
-
- REAL_VALUE_FROM_CONST_DOUBLE (d, op);
-
- switch (code)
- {
- case FIX:
- val = REAL_VALUE_FIX (d);
- break;
+ struct simplify_unary_real_args args;
+ args.operand = trueop;
+ args.mode = mode;
+ args.code = code;
+ args.want_integer = true;
- case UNSIGNED_FIX:
- val = REAL_VALUE_UNSIGNED_FIX (d);
- break;
+ if (do_float_handler (simplify_unary_real, (PTR) &args))
+ return args.result;
- default:
- abort ();
- }
-
- set_float_handler (NULL_PTR);
-
- val = trunc_int_for_mode (val, mode);
-
- return GEN_INT (val);
+ return 0;
}
#endif
/* This was formerly used only for non-IEEE float.
eggert@twinsun.com says it is safe for IEEE also. */
else
{
+ enum rtx_code reversed;
/* There are some simplifications we can do even if the operands
aren't constant. */
switch (code)
{
- case NEG:
case NOT:
- /* (not (not X)) == X, similarly for NEG. */
- if (GET_CODE (op) == code)
+ /* (not (not X)) == X. */
+ if (GET_CODE (op) == NOT)
+ return XEXP (op, 0);
+
+ /* (not (eq X Y)) == (ne X Y), etc. */
+ if (mode == BImode && GET_RTX_CLASS (GET_CODE (op)) == '<'
+ && ((reversed = reversed_comparison_code (op, NULL_RTX))
+ != UNKNOWN))
+ return gen_rtx_fmt_ee (reversed,
+ op_mode, XEXP (op, 0), XEXP (op, 1));
+ break;
+
+ case NEG:
+ /* (neg (neg X)) == X. */
+ if (GET_CODE (op) == NEG)
return XEXP (op, 0);
break;
/* (sign_extend (truncate (minus (label_ref L1) (label_ref L2))))
becomes just the MINUS if its mode is MODE. This allows
folding switch statements on machines using casesi (such as
- the Vax). */
+ the VAX). */
if (GET_CODE (op) == TRUNCATE
&& GET_MODE (XEXP (op, 0)) == mode
&& GET_CODE (XEXP (op, 0)) == MINUS
&& GET_CODE (XEXP (XEXP (op, 0), 1)) == LABEL_REF)
return XEXP (op, 0);
-#ifdef POINTERS_EXTEND_UNSIGNED
+#if defined(POINTERS_EXTEND_UNSIGNED) && !defined(HAVE_ptr_extend)
if (! POINTERS_EXTEND_UNSIGNED
&& mode == Pmode && GET_MODE (op) == ptr_mode
- && CONSTANT_P (op))
+ && (CONSTANT_P (op)
+ || (GET_CODE (op) == SUBREG
+ && GET_CODE (SUBREG_REG (op)) == REG
+ && REG_POINTER (SUBREG_REG (op))
+ && GET_MODE (SUBREG_REG (op)) == Pmode)))
return convert_memory_address (Pmode, op);
#endif
break;
-#ifdef POINTERS_EXTEND_UNSIGNED
+#if defined(POINTERS_EXTEND_UNSIGNED) && !defined(HAVE_ptr_extend)
case ZERO_EXTEND:
- if (POINTERS_EXTEND_UNSIGNED
+ if (POINTERS_EXTEND_UNSIGNED > 0
&& mode == Pmode && GET_MODE (op) == ptr_mode
- && CONSTANT_P (op))
+ && (CONSTANT_P (op)
+ || (GET_CODE (op) == SUBREG
+ && GET_CODE (SUBREG_REG (op)) == REG
+ && REG_POINTER (SUBREG_REG (op))
+ && GET_MODE (SUBREG_REG (op)) == Pmode)))
return convert_memory_address (Pmode, op);
break;
#endif
}
}
\f
+#if ! defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
+/* Subroutine of simplify_binary_operation, called via do_float_handler.
+ Handles simplification of binary ops on floating point values. */
+struct simplify_binary_real_args
+{
+ rtx trueop0, trueop1;
+ rtx result;
+ enum rtx_code code;
+ enum machine_mode mode;
+};
+
+static void
+simplify_binary_real (p)
+ PTR p;
+{
+ REAL_VALUE_TYPE f0, f1, value;
+ struct simplify_binary_real_args *args =
+ (struct simplify_binary_real_args *) p;
+
+ REAL_VALUE_FROM_CONST_DOUBLE (f0, args->trueop0);
+ REAL_VALUE_FROM_CONST_DOUBLE (f1, args->trueop1);
+ f0 = real_value_truncate (args->mode, f0);
+ f1 = real_value_truncate (args->mode, f1);
+
+#ifdef REAL_ARITHMETIC
+#ifndef REAL_INFINITY
+ if (args->code == DIV && REAL_VALUES_EQUAL (f1, dconst0))
+ {
+ args->result = 0;
+ return;
+ }
+#endif
+ REAL_ARITHMETIC (value, rtx_to_tree_code (args->code), f0, f1);
+#else
+ switch (args->code)
+ {
+ case PLUS:
+ value = f0 + f1;
+ break;
+ case MINUS:
+ value = f0 - f1;
+ break;
+ case MULT:
+ value = f0 * f1;
+ break;
+ case DIV:
+#ifndef REAL_INFINITY
+ if (f1 == 0)
+ return 0;
+#endif
+ value = f0 / f1;
+ break;
+ case SMIN:
+ value = MIN (f0, f1);
+ break;
+ case SMAX:
+ value = MAX (f0, f1);
+ break;
+ default:
+ abort ();
+ }
+#endif
+
+ value = real_value_truncate (args->mode, value);
+ args->result = CONST_DOUBLE_FROM_REAL_VALUE (value, args->mode);
+}
+#endif
+
+/* Another subroutine called via do_float_handler. This one tests
+ the floating point value given against 2. and -1. */
+struct simplify_binary_is2orm1_args
+{
+ rtx value;
+ bool is_2;
+ bool is_m1;
+};
+
+static void
+simplify_binary_is2orm1 (p)
+ PTR p;
+{
+ REAL_VALUE_TYPE d;
+ struct simplify_binary_is2orm1_args *args =
+ (struct simplify_binary_is2orm1_args *) p;
+
+ REAL_VALUE_FROM_CONST_DOUBLE (d, args->value);
+ args->is_2 = REAL_VALUES_EQUAL (d, dconst2);
+ args->is_m1 = REAL_VALUES_EQUAL (d, dconstm1);
+}
+
/* Simplify a binary operation CODE with result mode MODE, operating on OP0
and OP1. Return 0 if no simplification is possible.
Don't use this for relational operations such as EQ or LT.
Use simplify_relational_operation instead. */
-
rtx
simplify_binary_operation (code, mode, op0, op1)
enum rtx_code code;
enum machine_mode mode;
rtx op0, op1;
{
- register HOST_WIDE_INT arg0, arg1, arg0s, arg1s;
+ HOST_WIDE_INT arg0, arg1, arg0s, arg1s;
HOST_WIDE_INT val;
- int width = GET_MODE_BITSIZE (mode);
+ unsigned int width = GET_MODE_BITSIZE (mode);
rtx tem;
+ rtx trueop0 = avoid_constant_pool_reference (op0);
+ rtx trueop1 = avoid_constant_pool_reference (op1);
/* Relational operations don't work here. We must know the mode
of the operands in order to do the comparison correctly.
if (GET_RTX_CLASS (code) == '<')
abort ();
+ /* Make sure the constant is second. */
+ if (GET_RTX_CLASS (code) == 'c'
+ && swap_commutative_operands_p (trueop0, trueop1))
+ {
+ tem = op0, op0 = op1, op1 = tem;
+ tem = trueop0, trueop0 = trueop1, trueop1 = tem;
+ }
+
#if ! defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
if (GET_MODE_CLASS (mode) == MODE_FLOAT
- && GET_CODE (op0) == CONST_DOUBLE && GET_CODE (op1) == CONST_DOUBLE
+ && GET_CODE (trueop0) == CONST_DOUBLE
+ && GET_CODE (trueop1) == CONST_DOUBLE
&& mode == GET_MODE (op0) && mode == GET_MODE (op1))
{
- REAL_VALUE_TYPE f0, f1, value;
- jmp_buf handler;
-
- if (setjmp (handler))
- return 0;
-
- set_float_handler (handler);
-
- REAL_VALUE_FROM_CONST_DOUBLE (f0, op0);
- REAL_VALUE_FROM_CONST_DOUBLE (f1, op1);
- f0 = real_value_truncate (mode, f0);
- f1 = real_value_truncate (mode, f1);
-
-#ifdef REAL_ARITHMETIC
-#ifndef REAL_INFINITY
- if (code == DIV && REAL_VALUES_EQUAL (f1, dconst0))
- return 0;
-#endif
- REAL_ARITHMETIC (value, rtx_to_tree_code (code), f0, f1);
-#else
- switch (code)
- {
- case PLUS:
- value = f0 + f1;
- break;
- case MINUS:
- value = f0 - f1;
- break;
- case MULT:
- value = f0 * f1;
- break;
- case DIV:
-#ifndef REAL_INFINITY
- if (f1 == 0)
- return 0;
-#endif
- value = f0 / f1;
- break;
- case SMIN:
- value = MIN (f0, f1);
- break;
- case SMAX:
- value = MAX (f0, f1);
- break;
- default:
- abort ();
- }
-#endif
-
- value = real_value_truncate (mode, value);
- set_float_handler (NULL_PTR);
- return CONST_DOUBLE_FROM_REAL_VALUE (value, mode);
+ struct simplify_binary_real_args args;
+ args.trueop0 = trueop0;
+ args.trueop1 = trueop1;
+ args.mode = mode;
+ args.code = code;
+
+ if (do_float_handler (simplify_binary_real, (PTR) &args))
+ return args.result;
+ return 0;
}
#endif /* not REAL_IS_NOT_DOUBLE, or REAL_ARITHMETIC */
/* 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 (trueop0) == CONST_DOUBLE
+ || GET_CODE (trueop0) == CONST_INT)
+ && (GET_CODE (trueop1) == CONST_DOUBLE
+ || GET_CODE (trueop1) == CONST_INT))
{
- HOST_WIDE_INT l1, l2, h1, h2, lv, hv;
+ unsigned HOST_WIDE_INT l1, l2, lv;
+ HOST_WIDE_INT h1, h2, hv;
- if (GET_CODE (op0) == CONST_DOUBLE)
- l1 = CONST_DOUBLE_LOW (op0), h1 = CONST_DOUBLE_HIGH (op0);
+ if (GET_CODE (trueop0) == CONST_DOUBLE)
+ l1 = CONST_DOUBLE_LOW (trueop0), h1 = CONST_DOUBLE_HIGH (trueop0);
else
- l1 = INTVAL (op0), h1 = l1 < 0 ? -1 : 0;
+ l1 = INTVAL (trueop0), h1 = HWI_SIGN_EXTEND (l1);
- if (GET_CODE (op1) == CONST_DOUBLE)
- l2 = CONST_DOUBLE_LOW (op1), h2 = CONST_DOUBLE_HIGH (op1);
+ if (GET_CODE (trueop1) == CONST_DOUBLE)
+ l2 = CONST_DOUBLE_LOW (trueop1), h2 = CONST_DOUBLE_HIGH (trueop1);
else
- l2 = INTVAL (op1), h2 = l2 < 0 ? -1 : 0;
+ l2 = INTVAL (trueop1), h2 = HWI_SIGN_EXTEND (l2);
switch (code)
{
l2 &= (GET_MODE_BITSIZE (mode) - 1), h2 = 0;
#endif
- if (h2 != 0 || l2 < 0 || l2 >= GET_MODE_BITSIZE (mode))
+ if (h2 != 0 || l2 >= GET_MODE_BITSIZE (mode))
return 0;
if (code == LSHIFTRT || code == ASHIFTRT)
/* In IEEE floating point, x+0 is not the same as x. Similarly
for the other optimizations below. */
if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
- && FLOAT_MODE_P (mode) && ! flag_fast_math)
+ && FLOAT_MODE_P (mode) && ! flag_unsafe_math_optimizations)
break;
- if (op1 == CONST0_RTX (mode))
+ if (trueop1 == CONST0_RTX (mode))
return op0;
/* ((-a) + b) -> (b - a) and similarly for (a + (-b)) */
else if (GET_CODE (op1) == NEG)
return simplify_gen_binary (MINUS, mode, op0, XEXP (op1, 0));
+ /* (~a) + 1 -> -a */
+ if (INTEGRAL_MODE_P (mode)
+ && GET_CODE (op0) == NOT
+ && trueop1 == const1_rtx)
+ return gen_rtx_NEG (mode, XEXP (op0, 0));
+
/* Handle both-operands-constant cases. We can only add
CONST_INTs to constants since the sum of relocatable symbols
can't be handled by most assemblers. Don't add CONST_INT
if (INTEGRAL_MODE_P (mode)
&& (GET_CODE (op0) == PLUS || GET_CODE (op0) == MINUS
- || GET_CODE (op1) == PLUS || GET_CODE (op1) == MINUS)
+ || GET_CODE (op1) == PLUS || GET_CODE (op1) == MINUS
+ || (GET_CODE (op0) == CONST
+ && GET_CODE (XEXP (op0, 0)) == PLUS)
+ || (GET_CODE (op1) == CONST
+ && GET_CODE (XEXP (op1, 0)) == PLUS))
&& (tem = simplify_plus_minus (code, mode, op0, op1)) != 0)
return tem;
break;
In IEEE floating point, x-0 is not the same as x. */
if ((TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT
- || ! FLOAT_MODE_P (mode) || flag_fast_math)
- && op1 == CONST0_RTX (mode))
+ || ! 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))
+ && XEXP (op0, 1) == const0_rtx && XEXP (op1, 1) == const0_rtx)
+ {
+ rtx xop00 = XEXP (op0, 0);
+ rtx xop10 = XEXP (op1, 0);
+
+#ifdef HAVE_cc0
+ if (GET_CODE (xop00) == CC0 && GET_CODE (xop10) == CC0)
#else
- /* Do nothing here. */
+ if (GET_CODE (xop00) == REG && GET_CODE (xop10) == REG
+ && GET_MODE (xop00) == GET_MODE (xop10)
+ && REGNO (xop00) == REGNO (xop10)
+ && GET_MODE_CLASS (GET_MODE (xop00)) == MODE_CC
+ && GET_MODE_CLASS (GET_MODE (xop10)) == MODE_CC)
#endif
- break;
-
+ return xop00;
+ }
+ break;
+
case MINUS:
/* None of these optimizations can be done for IEEE
floating point. */
if (TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT
- && FLOAT_MODE_P (mode) && ! flag_fast_math)
+ && FLOAT_MODE_P (mode) && ! flag_unsafe_math_optimizations)
break;
/* 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 -ffast-math. */
- if (rtx_equal_p (op0, op1)
+ will treat it as zero with -funsafe-math-optimizations. */
+ if (rtx_equal_p (trueop0, trueop1)
&& ! side_effects_p (op0)
- && (! FLOAT_MODE_P (mode) || flag_fast_math))
+ && (! FLOAT_MODE_P (mode) || flag_unsafe_math_optimizations))
return CONST0_RTX (mode);
/* Change subtraction from zero into negation. */
- if (op0 == CONST0_RTX (mode))
+ if (trueop0 == CONST0_RTX (mode))
return gen_rtx_NEG (mode, op1);
/* (-1 - a) is ~a. */
- if (op0 == constm1_rtx)
+ if (trueop0 == constm1_rtx)
return gen_rtx_NOT (mode, op1);
/* Subtracting 0 has no effect. */
- if (op1 == CONST0_RTX (mode))
+ if (trueop1 == CONST0_RTX (mode))
return op0;
/* See if this is something like X * C - X or vice versa or
if (INTEGRAL_MODE_P (mode)
&& (GET_CODE (op0) == PLUS || GET_CODE (op0) == MINUS
- || GET_CODE (op1) == PLUS || GET_CODE (op1) == MINUS)
+ || GET_CODE (op1) == PLUS || GET_CODE (op1) == MINUS
+ || (GET_CODE (op0) == CONST
+ && GET_CODE (XEXP (op0, 0)) == PLUS)
+ || (GET_CODE (op1) == CONST
+ && GET_CODE (XEXP (op1, 0)) == PLUS))
&& (tem = simplify_plus_minus (code, mode, op0, op1)) != 0)
return tem;
/* Don't let a relocatable value get a negative coeff. */
if (GET_CODE (op1) == CONST_INT && GET_MODE (op0) != VOIDmode)
- return plus_constant (op0, - INTVAL (op1));
+ return simplify_gen_binary (PLUS, mode,
+ op0,
+ neg_const_int (mode, op1));
/* (x - (x & y)) -> (x & ~y) */
if (GET_CODE (op1) == AND)
break;
case MULT:
- if (op1 == constm1_rtx)
+ if (trueop1 == constm1_rtx)
{
tem = simplify_unary_operation (NEG, mode, op0, mode);
/* In IEEE floating point, x*0 is not always 0. */
if ((TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT
- || ! FLOAT_MODE_P (mode) || flag_fast_math)
- && op1 == CONST0_RTX (mode)
+ || ! FLOAT_MODE_P (mode) || flag_unsafe_math_optimizations)
+ && trueop1 == CONST0_RTX (mode)
&& ! side_effects_p (op0))
return op1;
/* In IEEE floating point, x*1 is not equivalent to x for nans.
However, ANSI says we can drop signals,
so we can do this anyway. */
- if (op1 == CONST1_RTX (mode))
+ if (trueop1 == CONST1_RTX (mode))
return op0;
/* Convert multiply by constant power of two into shift unless
we are still generating RTL. This test is a kludge. */
- if (GET_CODE (op1) == CONST_INT
- && (val = exact_log2 (INTVAL (op1))) >= 0
+ if (GET_CODE (trueop1) == CONST_INT
+ && (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
to implicit sign extension. */
&& ! rtx_equal_function_value_matters)
return gen_rtx_ASHIFT (mode, op0, GEN_INT (val));
- if (GET_CODE (op1) == CONST_DOUBLE
- && GET_MODE_CLASS (GET_MODE (op1)) == MODE_FLOAT)
+ if (GET_CODE (trueop1) == CONST_DOUBLE
+ && GET_MODE_CLASS (GET_MODE (trueop1)) == MODE_FLOAT)
{
- REAL_VALUE_TYPE d;
- jmp_buf handler;
- int op1is2, op1ism1;
+ struct simplify_binary_is2orm1_args args;
- if (setjmp (handler))
+ args.value = trueop1;
+ if (! do_float_handler (simplify_binary_is2orm1, (PTR) &args))
return 0;
- set_float_handler (handler);
- REAL_VALUE_FROM_CONST_DOUBLE (d, op1);
- op1is2 = REAL_VALUES_EQUAL (d, dconst2);
- op1ism1 = REAL_VALUES_EQUAL (d, dconstm1);
- set_float_handler (NULL_PTR);
-
/* x*2 is x+x and x*(-1) is -x */
- if (op1is2 && GET_MODE (op0) == mode)
+ if (args.is_2 && GET_MODE (op0) == mode)
return gen_rtx_PLUS (mode, op0, copy_rtx (op0));
- else if (op1ism1 && GET_MODE (op0) == mode)
+ else if (args.is_m1 && GET_MODE (op0) == mode)
return gen_rtx_NEG (mode, op0);
}
break;
case IOR:
- if (op1 == const0_rtx)
+ if (trueop1 == const0_rtx)
return op0;
- if (GET_CODE (op1) == CONST_INT
- && (INTVAL (op1) & GET_MODE_MASK (mode)) == GET_MODE_MASK (mode))
+ if (GET_CODE (trueop1) == CONST_INT
+ && ((INTVAL (trueop1) & GET_MODE_MASK (mode))
+ == GET_MODE_MASK (mode)))
return op1;
- if (rtx_equal_p (op0, op1) && ! side_effects_p (op0))
+ if (rtx_equal_p (trueop0, trueop1) && ! side_effects_p (op0))
return op0;
/* A | (~A) -> -1 */
if (((GET_CODE (op0) == NOT && rtx_equal_p (XEXP (op0, 0), op1))
break;
case XOR:
- if (op1 == const0_rtx)
+ if (trueop1 == const0_rtx)
return op0;
- if (GET_CODE (op1) == CONST_INT
- && (INTVAL (op1) & GET_MODE_MASK (mode)) == GET_MODE_MASK (mode))
+ if (GET_CODE (trueop1) == CONST_INT
+ && ((INTVAL (trueop1) & GET_MODE_MASK (mode))
+ == GET_MODE_MASK (mode)))
return gen_rtx_NOT (mode, op0);
- if (op0 == op1 && ! side_effects_p (op0)
+ if (trueop0 == trueop1 && ! side_effects_p (op0)
&& GET_MODE_CLASS (mode) != MODE_CC)
return const0_rtx;
break;
case AND:
- if (op1 == const0_rtx && ! side_effects_p (op0))
+ if (trueop1 == const0_rtx && ! side_effects_p (op0))
return const0_rtx;
- if (GET_CODE (op1) == CONST_INT
- && (INTVAL (op1) & GET_MODE_MASK (mode)) == GET_MODE_MASK (mode))
+ if (GET_CODE (trueop1) == CONST_INT
+ && ((INTVAL (trueop1) & GET_MODE_MASK (mode))
+ == GET_MODE_MASK (mode)))
return op0;
- if (op0 == op1 && ! side_effects_p (op0)
+ if (trueop0 == trueop1 && ! side_effects_p (op0)
&& GET_MODE_CLASS (mode) != MODE_CC)
return op0;
/* A & (~A) -> 0 */
case UDIV:
/* Convert divide by power of two into shift (divide by 1 handled
below). */
- if (GET_CODE (op1) == CONST_INT
- && (arg1 = exact_log2 (INTVAL (op1))) > 0)
+ if (GET_CODE (trueop1) == CONST_INT
+ && (arg1 = exact_log2 (INTVAL (trueop1))) > 0)
return gen_rtx_LSHIFTRT (mode, op0, GEN_INT (arg1));
/* ... fall through ... */
case DIV:
- if (op1 == CONST1_RTX (mode))
- return op0;
+ if (trueop1 == CONST1_RTX (mode))
+ {
+ /* On some platforms DIV uses narrower mode than its
+ operands. */
+ rtx x = gen_lowpart_common (mode, op0);
+ if (x)
+ return x;
+ else if (mode != GET_MODE (op0) && GET_MODE (op0) != VOIDmode)
+ return gen_lowpart_SUBREG (mode, op0);
+ else
+ return op0;
+ }
/* In IEEE floating point, 0/x is not always 0. */
if ((TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT
- || ! FLOAT_MODE_P (mode) || flag_fast_math)
- && op0 == CONST0_RTX (mode)
+ || ! FLOAT_MODE_P (mode) || flag_unsafe_math_optimizations)
+ && trueop0 == CONST0_RTX (mode)
&& ! side_effects_p (op1))
return op0;
#if ! defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
/* Change division by a constant into multiplication. Only do
- this with -ffast-math until an expert says it is safe in
- general. */
- else if (GET_CODE (op1) == CONST_DOUBLE
- && GET_MODE_CLASS (GET_MODE (op1)) == MODE_FLOAT
- && op1 != CONST0_RTX (mode)
- && flag_fast_math)
+ this with -funsafe-math-optimizations. */
+ else if (GET_CODE (trueop1) == CONST_DOUBLE
+ && GET_MODE_CLASS (GET_MODE (trueop1)) == MODE_FLOAT
+ && trueop1 != CONST0_RTX (mode)
+ && flag_unsafe_math_optimizations)
{
REAL_VALUE_TYPE d;
- REAL_VALUE_FROM_CONST_DOUBLE (d, op1);
+ REAL_VALUE_FROM_CONST_DOUBLE (d, trueop1);
if (! REAL_VALUES_EQUAL (d, dconst0))
{
case UMOD:
/* Handle modulus by power of two (mod with 1 handled below). */
- if (GET_CODE (op1) == CONST_INT
- && exact_log2 (INTVAL (op1)) > 0)
+ if (GET_CODE (trueop1) == CONST_INT
+ && exact_log2 (INTVAL (trueop1)) > 0)
return gen_rtx_AND (mode, op0, GEN_INT (INTVAL (op1) - 1));
/* ... fall through ... */
case MOD:
- if ((op0 == const0_rtx || op1 == const1_rtx)
+ if ((trueop0 == const0_rtx || trueop1 == const1_rtx)
&& ! side_effects_p (op0) && ! side_effects_p (op1))
return const0_rtx;
break;
case ROTATERT:
case ROTATE:
/* Rotating ~0 always results in ~0. */
- if (GET_CODE (op0) == CONST_INT && width <= HOST_BITS_PER_WIDE_INT
- && (unsigned HOST_WIDE_INT) INTVAL (op0) == GET_MODE_MASK (mode)
+ if (GET_CODE (trueop0) == CONST_INT && width <= HOST_BITS_PER_WIDE_INT
+ && (unsigned HOST_WIDE_INT) INTVAL (trueop0) == GET_MODE_MASK (mode)
&& ! side_effects_p (op1))
return op0;
case ASHIFT:
case ASHIFTRT:
case LSHIFTRT:
- if (op1 == const0_rtx)
+ if (trueop1 == const0_rtx)
return op0;
- if (op0 == const0_rtx && ! side_effects_p (op1))
+ if (trueop0 == const0_rtx && ! side_effects_p (op1))
return op0;
break;
case SMIN:
- if (width <= HOST_BITS_PER_WIDE_INT && GET_CODE (op1) == CONST_INT
- && INTVAL (op1) == (HOST_WIDE_INT) 1 << (width -1)
+ if (width <= HOST_BITS_PER_WIDE_INT && GET_CODE (trueop1) == CONST_INT
+ && INTVAL (trueop1) == (HOST_WIDE_INT) 1 << (width -1)
&& ! side_effects_p (op0))
return op1;
- else if (rtx_equal_p (op0, op1) && ! side_effects_p (op0))
+ else if (rtx_equal_p (trueop0, trueop1) && ! side_effects_p (op0))
return op0;
break;
case SMAX:
- if (width <= HOST_BITS_PER_WIDE_INT && GET_CODE (op1) == CONST_INT
- && ((unsigned HOST_WIDE_INT) INTVAL (op1)
+ if (width <= HOST_BITS_PER_WIDE_INT && GET_CODE (trueop1) == CONST_INT
+ && ((unsigned HOST_WIDE_INT) INTVAL (trueop1)
== (unsigned HOST_WIDE_INT) GET_MODE_MASK (mode) >> 1)
&& ! side_effects_p (op0))
return op1;
- else if (rtx_equal_p (op0, op1) && ! side_effects_p (op0))
+ else if (rtx_equal_p (trueop0, trueop1) && ! side_effects_p (op0))
return op0;
break;
case UMIN:
- if (op1 == const0_rtx && ! side_effects_p (op0))
+ if (trueop1 == const0_rtx && ! side_effects_p (op0))
return op1;
- else if (rtx_equal_p (op0, op1) && ! side_effects_p (op0))
+ else if (rtx_equal_p (trueop0, trueop1) && ! side_effects_p (op0))
return op0;
break;
case UMAX:
- if (op1 == constm1_rtx && ! side_effects_p (op0))
+ if (trueop1 == constm1_rtx && ! side_effects_p (op0))
return op1;
- else if (rtx_equal_p (op0, op1) && ! side_effects_p (op0))
+ else if (rtx_equal_p (trueop0, trueop1) && ! side_effects_p (op0))
return op0;
break;
+ case SS_PLUS:
+ case US_PLUS:
+ case SS_MINUS:
+ case US_MINUS:
+ /* ??? There are simplifications that can be done. */
+ return 0;
+
default:
abort ();
}
/* Get the integer argument values in two forms:
zero-extended in ARG0, ARG1 and sign-extended in ARG0S, ARG1S. */
- arg0 = INTVAL (op0);
- arg1 = INTVAL (op1);
+ arg0 = INTVAL (trueop0);
+ arg1 = INTVAL (trueop1);
if (width < HOST_BITS_PER_WIDE_INT)
{
break;
case DIV:
- if (arg1s == 0)
+ if (arg1s == 0
+ || (arg0s == (HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1)
+ && arg1s == -1))
return 0;
val = arg0s / arg1s;
break;
case MOD:
- if (arg1s == 0)
+ if (arg1s == 0
+ || (arg0s == (HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1)
+ && arg1s == -1))
return 0;
val = arg0s % arg1s;
break;
case UDIV:
- if (arg1 == 0)
+ if (arg1 == 0
+ || (arg0s == (HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1)
+ && arg1s == -1))
return 0;
val = (unsigned HOST_WIDE_INT) arg0 / arg1;
break;
case UMOD:
- if (arg1 == 0)
+ if (arg1 == 0
+ || (arg0s == (HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1)
+ && arg1s == -1))
return 0;
val = (unsigned HOST_WIDE_INT) arg0 % arg1;
break;
and do all possible simplifications until no more changes occur. Then
we rebuild the operation. */
+struct simplify_plus_minus_op_data
+{
+ rtx op;
+ int neg;
+};
+
+static int
+simplify_plus_minus_op_data_cmp (p1, p2)
+ const void *p1;
+ const void *p2;
+{
+ const struct simplify_plus_minus_op_data *d1 = p1;
+ const struct simplify_plus_minus_op_data *d2 = p2;
+
+ return (commutative_operand_precedence (d2->op)
+ - commutative_operand_precedence (d1->op));
+}
+
static rtx
simplify_plus_minus (code, mode, op0, op1)
enum rtx_code code;
enum machine_mode mode;
rtx op0, op1;
{
- rtx ops[8];
- int negs[8];
+ struct simplify_plus_minus_op_data ops[8];
rtx result, tem;
- int n_ops = 2, input_ops = 2, input_consts = 0, n_consts = 0;
- int first = 1, negate = 0, changed;
+ int n_ops = 2, input_ops = 2, input_consts = 0, n_consts;
+ int first, negate, changed;
int i, j;
- bzero ((char *) ops, sizeof ops);
+ memset ((char *) ops, 0, sizeof ops);
/* Set up the two operands and then expand them until nothing has been
changed. If we run out of room in our array, give up; this should
almost never happen. */
- ops[0] = op0, ops[1] = op1, negs[0] = 0, negs[1] = (code == MINUS);
+ ops[0].op = op0;
+ ops[0].neg = 0;
+ ops[1].op = op1;
+ ops[1].neg = (code == MINUS);
- changed = 1;
- while (changed)
+ do
{
changed = 0;
for (i = 0; i < n_ops; i++)
- switch (GET_CODE (ops[i]))
- {
- case PLUS:
- case MINUS:
- if (n_ops == 7)
- return 0;
-
- ops[n_ops] = XEXP (ops[i], 1);
- negs[n_ops++] = GET_CODE (ops[i]) == MINUS ? !negs[i] : negs[i];
- ops[i] = XEXP (ops[i], 0);
- input_ops++;
- changed = 1;
- break;
-
- case NEG:
- ops[i] = XEXP (ops[i], 0);
- negs[i] = ! negs[i];
- changed = 1;
- break;
+ {
+ rtx this_op = ops[i].op;
+ int this_neg = ops[i].neg;
+ enum rtx_code this_code = GET_CODE (this_op);
- case CONST:
- ops[i] = XEXP (ops[i], 0);
- input_consts++;
- changed = 1;
- break;
+ switch (this_code)
+ {
+ case PLUS:
+ case MINUS:
+ if (n_ops == 7)
+ return 0;
- case NOT:
- /* ~a -> (-a - 1) */
- if (n_ops != 7)
- {
- ops[n_ops] = constm1_rtx;
- negs[n_ops++] = negs[i];
- ops[i] = XEXP (ops[i], 0);
- negs[i] = ! negs[i];
- changed = 1;
- }
- break;
+ ops[n_ops].op = XEXP (this_op, 1);
+ ops[n_ops].neg = (this_code == MINUS) ^ this_neg;
+ n_ops++;
+
+ ops[i].op = XEXP (this_op, 0);
+ input_ops++;
+ changed = 1;
+ break;
+
+ case NEG:
+ ops[i].op = XEXP (this_op, 0);
+ ops[i].neg = ! this_neg;
+ changed = 1;
+ break;
+
+ case CONST:
+ ops[i].op = XEXP (this_op, 0);
+ input_consts++;
+ changed = 1;
+ break;
+
+ case NOT:
+ /* ~a -> (-a - 1) */
+ if (n_ops != 7)
+ {
+ ops[n_ops].op = constm1_rtx;
+ ops[n_ops++].neg = this_neg;
+ ops[i].op = XEXP (this_op, 0);
+ ops[i].neg = !this_neg;
+ changed = 1;
+ }
+ break;
- case CONST_INT:
- if (negs[i])
- ops[i] = GEN_INT (- INTVAL (ops[i])), negs[i] = 0, changed = 1;
- break;
+ case CONST_INT:
+ if (this_neg)
+ {
+ ops[i].op = neg_const_int (mode, this_op);
+ ops[i].neg = 0;
+ changed = 1;
+ }
+ break;
- default:
- break;
- }
+ default:
+ break;
+ }
+ }
}
+ while (changed);
/* If we only have two operands, we can't do anything. */
if (n_ops <= 2)
- return 0;
+ return NULL_RTX;
/* Now simplify each pair of operands until nothing changes. The first
time through just simplify constants against each other. */
- changed = 1;
- while (changed)
+ first = 1;
+ do
{
changed = first;
for (i = 0; i < n_ops - 1; i++)
for (j = i + 1; j < n_ops; j++)
- if (ops[i] != 0 && ops[j] != 0
- && (! first || (CONSTANT_P (ops[i]) && CONSTANT_P (ops[j]))))
- {
- rtx lhs = ops[i], rhs = ops[j];
- enum rtx_code ncode = PLUS;
-
- if (negs[i] && ! negs[j])
- lhs = ops[j], rhs = ops[i], ncode = MINUS;
- else if (! negs[i] && negs[j])
- ncode = MINUS;
-
- tem = simplify_binary_operation (ncode, mode, lhs, rhs);
- if (tem)
- {
- ops[i] = tem, ops[j] = 0;
- negs[i] = negs[i] && negs[j];
- if (GET_CODE (tem) == NEG)
- ops[i] = XEXP (tem, 0), negs[i] = ! negs[i];
+ {
+ rtx lhs = ops[i].op, rhs = ops[j].op;
+ int lneg = ops[i].neg, rneg = ops[j].neg;
- if (GET_CODE (ops[i]) == CONST_INT && negs[i])
- ops[i] = GEN_INT (- INTVAL (ops[i])), negs[i] = 0;
- changed = 1;
- }
- }
+ if (lhs != 0 && rhs != 0
+ && (! first || (CONSTANT_P (lhs) && CONSTANT_P (rhs))))
+ {
+ enum rtx_code ncode = PLUS;
+
+ if (lneg != rneg)
+ {
+ ncode = MINUS;
+ if (lneg)
+ tem = lhs, lhs = rhs, rhs = tem;
+ }
+ else if (swap_commutative_operands_p (lhs, rhs))
+ tem = lhs, lhs = rhs, rhs = tem;
+
+ 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
+ when it calls us to simplify CONST operations. */
+ if (tem
+ && ! (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))
+ {
+ lneg &= rneg;
+ if (GET_CODE (tem) == NEG)
+ tem = XEXP (tem, 0), lneg = !lneg;
+ if (GET_CODE (tem) == CONST_INT && lneg)
+ tem = neg_const_int (mode, tem), lneg = 0;
+
+ ops[i].op = tem;
+ ops[i].neg = lneg;
+ ops[j].op = NULL_RTX;
+ changed = 1;
+ }
+ }
+ }
first = 0;
}
+ while (changed);
- /* Pack all the operands to the lower-numbered entries and 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 we had, this is also
- an improvement, so accept it. */
-
+ /* Pack all the operands to the lower-numbered entries. */
for (i = 0, j = 0; j < n_ops; j++)
- if (ops[j] != 0)
- {
- ops[i] = ops[j], negs[i++] = negs[j];
- if (GET_CODE (ops[j]) == CONST)
- n_consts++;
- }
+ if (ops[j].op)
+ ops[i++] = ops[j];
+ n_ops = i;
- if (i + n_consts > input_ops
- || (i + n_consts == input_ops && n_consts <= input_consts))
- return 0;
+ /* Sort the operations based on swap_commutative_operands_p. */
+ qsort (ops, n_ops, sizeof (*ops), simplify_plus_minus_op_data_cmp);
- n_ops = i;
+ /* 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
+ one CONST_INT, and the sort will have ensured that it is last
+ in the array and that any other constant will be next-to-last. */
- /* If we have a CONST_INT, put it last. */
- for (i = 0; i < n_ops - 1; i++)
- if (GET_CODE (ops[i]) == CONST_INT)
- {
- tem = ops[n_ops - 1], ops[n_ops - 1] = ops[i] , ops[i] = tem;
- j = negs[n_ops - 1], negs[n_ops - 1] = negs[i], negs[i] = j;
- }
+ if (n_ops > 1
+ && GET_CODE (ops[n_ops - 1].op) == CONST_INT
+ && CONSTANT_P (ops[n_ops - 2].op))
+ {
+ rtx value = ops[n_ops - 1].op;
+ if (ops[n_ops - 1].neg ^ ops[n_ops - 2].neg)
+ value = neg_const_int (mode, value);
+ ops[n_ops - 2].op = plus_constant (ops[n_ops - 2].op, INTVAL (value));
+ 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 (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 there aren't any, make all
operands positive and negate the whole thing later. */
- for (i = 0; i < n_ops && negs[i]; i++)
- ;
+ negate = 0;
+ for (i = 0; i < n_ops && ops[i].neg; i++)
+ continue;
if (i == n_ops)
{
for (i = 0; i < n_ops; i++)
- negs[i] = 0;
+ ops[i].neg = 0;
negate = 1;
}
else if (i != 0)
{
- tem = ops[0], ops[0] = ops[i], ops[i] = tem;
- j = negs[0], negs[0] = negs[i], negs[i] = j;
+ tem = ops[0].op;
+ ops[0] = ops[i];
+ ops[i].op = tem;
+ ops[i].neg = 1;
}
/* Now make the result by performing the requested operations. */
- result = ops[0];
+ result = ops[0].op;
for (i = 1; i < n_ops; i++)
- result = simplify_gen_binary (negs[i] ? MINUS : PLUS, mode, result, ops[i]);
+ result = gen_rtx_fmt_ee (ops[i].neg ? MINUS : PLUS,
+ mode, result, ops[i].op);
return negate ? gen_rtx_NEG (mode, result) : result;
}
struct cfc_args
{
- /* Input */
- rtx op0, op1;
- /* Output */
- int equal, op0lt, op1lt;
+ rtx op0, op1; /* Input */
+ int equal, op0lt, op1lt; /* Output */
+ int unordered;
};
static void
check_fold_consts (data)
PTR data;
{
- struct cfc_args * args = (struct cfc_args *) data;
+ struct cfc_args *args = (struct cfc_args *) data;
REAL_VALUE_TYPE d0, d1;
+ /* We may possibly raise an exception while reading the value. */
+ args->unordered = 1;
REAL_VALUE_FROM_CONST_DOUBLE (d0, args->op0);
REAL_VALUE_FROM_CONST_DOUBLE (d1, args->op1);
+
+ /* Comparisons of Inf versus Inf are ordered. */
+ if (REAL_VALUE_ISNAN (d0)
+ || REAL_VALUE_ISNAN (d1))
+ return;
args->equal = REAL_VALUES_EQUAL (d0, d1);
args->op0lt = REAL_VALUES_LESS (d0, d1);
args->op1lt = REAL_VALUES_LESS (d1, d0);
+ args->unordered = 0;
}
/* Like simplify_binary_operation except used for relational operators.
{
int equal, op0lt, op0ltu, op1lt, op1ltu;
rtx tem;
+ rtx trueop0;
+ rtx trueop1;
+
+ if (mode == VOIDmode
+ && (GET_MODE (op0) != VOIDmode
+ || GET_MODE (op1) != VOIDmode))
+ abort ();
/* If op0 is a compare, extract the comparison arguments from it. */
if (GET_CODE (op0) == COMPARE && op1 == const0_rtx)
op1 = XEXP (op0, 1), op0 = XEXP (op0, 0);
+ trueop0 = avoid_constant_pool_reference (op0);
+ trueop1 = avoid_constant_pool_reference (op1);
+
/* We can't simplify MODE_CC values since we don't know what the
actual comparison is. */
if (GET_MODE_CLASS (GET_MODE (op0)) == MODE_CC
)
return 0;
+ /* Make sure the constant is second. */
+ if (swap_commutative_operands_p (trueop0, trueop1))
+ {
+ tem = op0, op0 = op1, op1 = tem;
+ tem = trueop0, trueop0 = trueop1, trueop1 = tem;
+ code = swap_condition (code);
+ }
+
/* For integer comparisons of A and B maybe we can simplify A - B and can
then simplify a comparison of that with zero. If A and B are both either
a register or a CONST_INT, this can't help; testing for these cases will
ANSI C defines unsigned operations such that they never overflow, and
thus such cases can not be ignored. */
- if (INTEGRAL_MODE_P (mode) && op1 != const0_rtx
- && ! ((GET_CODE (op0) == REG || GET_CODE (op0) == CONST_INT)
- && (GET_CODE (op1) == REG || GET_CODE (op1) == CONST_INT))
+ if (INTEGRAL_MODE_P (mode) && trueop1 != const0_rtx
+ && ! ((GET_CODE (op0) == REG || GET_CODE (trueop0) == CONST_INT)
+ && (GET_CODE (op1) == REG || GET_CODE (trueop1) == CONST_INT))
&& 0 != (tem = simplify_binary_operation (MINUS, mode, op0, op1))
&& code != GTU && code != GEU && code != LTU && code != LEU)
return simplify_relational_operation (signed_condition (code),
mode, tem, const0_rtx);
+ if (flag_unsafe_math_optimizations && code == ORDERED)
+ return const_true_rtx;
+
+ if (flag_unsafe_math_optimizations && code == UNORDERED)
+ return const0_rtx;
+
/* For non-IEEE floating-point, if the two operands are equal, we know the
result. */
- if (rtx_equal_p (op0, op1)
+ if (rtx_equal_p (trueop0, trueop1)
&& (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT
- || ! FLOAT_MODE_P (GET_MODE (op0)) || flag_fast_math))
+ || ! FLOAT_MODE_P (GET_MODE (trueop0))
+ || flag_unsafe_math_optimizations))
equal = 1, op0lt = 0, op0ltu = 0, op1lt = 0, op1ltu = 0;
/* If the operands are floating-point constants, see if we can fold
the result. */
#if ! defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
- else if (GET_CODE (op0) == CONST_DOUBLE && GET_CODE (op1) == CONST_DOUBLE
- && GET_MODE_CLASS (GET_MODE (op0)) == MODE_FLOAT)
+ else if (GET_CODE (trueop0) == CONST_DOUBLE
+ && GET_CODE (trueop1) == CONST_DOUBLE
+ && GET_MODE_CLASS (GET_MODE (trueop0)) == MODE_FLOAT)
{
struct cfc_args args;
/* Setup input for check_fold_consts() */
- args.op0 = op0;
- args.op1 = op1;
+ args.op0 = trueop0;
+ args.op1 = trueop1;
- if (do_float_handler(check_fold_consts, (PTR) &args) == 0)
- /* We got an exception from check_fold_consts() */
- return 0;
+
+ if (!do_float_handler (check_fold_consts, (PTR) &args))
+ args.unordered = 1;
+
+ if (args.unordered)
+ switch (code)
+ {
+ case UNEQ:
+ case UNLT:
+ case UNGT:
+ case UNLE:
+ case UNGE:
+ case NE:
+ case UNORDERED:
+ return const_true_rtx;
+ case EQ:
+ case LT:
+ case GT:
+ case LE:
+ case GE:
+ case LTGT:
+ case ORDERED:
+ return const0_rtx;
+ default:
+ return 0;
+ }
/* Receive output from check_fold_consts() */
equal = args.equal;
/* Otherwise, see if the operands are both integers. */
else if ((GET_MODE_CLASS (mode) == MODE_INT || mode == VOIDmode)
- && (GET_CODE (op0) == CONST_DOUBLE || GET_CODE (op0) == CONST_INT)
- && (GET_CODE (op1) == CONST_DOUBLE || GET_CODE (op1) == CONST_INT))
+ && (GET_CODE (trueop0) == CONST_DOUBLE
+ || GET_CODE (trueop0) == CONST_INT)
+ && (GET_CODE (trueop1) == CONST_DOUBLE
+ || GET_CODE (trueop1) == CONST_INT))
{
int width = GET_MODE_BITSIZE (mode);
HOST_WIDE_INT l0s, h0s, l1s, h1s;
unsigned HOST_WIDE_INT l0u, h0u, l1u, h1u;
/* Get the two words comprising each integer constant. */
- if (GET_CODE (op0) == CONST_DOUBLE)
+ if (GET_CODE (trueop0) == CONST_DOUBLE)
{
- l0u = l0s = CONST_DOUBLE_LOW (op0);
- h0u = h0s = CONST_DOUBLE_HIGH (op0);
+ l0u = l0s = CONST_DOUBLE_LOW (trueop0);
+ h0u = h0s = CONST_DOUBLE_HIGH (trueop0);
}
else
{
- l0u = l0s = INTVAL (op0);
- h0u = h0s = l0s < 0 ? -1 : 0;
+ l0u = l0s = INTVAL (trueop0);
+ h0u = h0s = HWI_SIGN_EXTEND (l0s);
}
- if (GET_CODE (op1) == CONST_DOUBLE)
+ if (GET_CODE (trueop1) == CONST_DOUBLE)
{
- l1u = l1s = CONST_DOUBLE_LOW (op1);
- h1u = h1s = CONST_DOUBLE_HIGH (op1);
+ l1u = l1s = CONST_DOUBLE_LOW (trueop1);
+ h1u = h1s = CONST_DOUBLE_HIGH (trueop1);
}
else
{
- l1u = l1s = INTVAL (op1);
- h1u = h1s = l1s < 0 ? -1 : 0;
+ l1u = l1s = INTVAL (trueop1);
+ h1u = h1s = HWI_SIGN_EXTEND (l1s);
}
/* If WIDTH is nonzero and smaller than HOST_BITS_PER_WIDE_INT,
we have to sign or zero-extend the values. */
- if (width != 0 && width <= HOST_BITS_PER_WIDE_INT)
- h0u = h1u = 0, h0s = l0s < 0 ? -1 : 0, h1s = l1s < 0 ? -1 : 0;
-
if (width != 0 && width < HOST_BITS_PER_WIDE_INT)
{
l0u &= ((HOST_WIDE_INT) 1 << width) - 1;
if (l1s & ((HOST_WIDE_INT) 1 << (width - 1)))
l1s |= ((HOST_WIDE_INT) (-1) << width);
}
+ 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 && l0s < l1s));
- op1lt = (h1s < h0s || (h1s == h0s && l1s < l0s));
+ 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));
}
case EQ:
/* References to the frame plus a constant or labels cannot
be zero, but a SYMBOL_REF can due to #pragma weak. */
- if (((NONZERO_BASE_PLUS_P (op0) && op1 == const0_rtx)
- || GET_CODE (op0) == LABEL_REF)
+ if (((NONZERO_BASE_PLUS_P (op0) && trueop1 == const0_rtx)
+ || GET_CODE (trueop0) == LABEL_REF)
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
/* On some machines, the ap reg can be 0 sometimes. */
&& op0 != arg_pointer_rtx
break;
case NE:
- if (((NONZERO_BASE_PLUS_P (op0) && op1 == const0_rtx)
- || GET_CODE (op0) == LABEL_REF)
+ if (((NONZERO_BASE_PLUS_P (op0) && trueop1 == const0_rtx)
+ || GET_CODE (trueop0) == LABEL_REF)
#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
&& op0 != arg_pointer_rtx
#endif
case GEU:
/* Unsigned values are never negative. */
- if (op1 == const0_rtx)
+ if (trueop1 == const0_rtx)
return const_true_rtx;
break;
case LTU:
- if (op1 == const0_rtx)
+ if (trueop1 == const0_rtx)
return const0_rtx;
break;
case LEU:
/* Unsigned values are never greater than the largest
unsigned value. */
- if (GET_CODE (op1) == CONST_INT
- && (unsigned HOST_WIDE_INT) INTVAL (op1) == GET_MODE_MASK (mode)
+ if (GET_CODE (trueop1) == CONST_INT
+ && (unsigned HOST_WIDE_INT) INTVAL (trueop1) == GET_MODE_MASK (mode)
&& INTEGRAL_MODE_P (mode))
return const_true_rtx;
break;
case GTU:
- if (GET_CODE (op1) == CONST_INT
- && (unsigned HOST_WIDE_INT) INTVAL (op1) == GET_MODE_MASK (mode)
+ if (GET_CODE (trueop1) == CONST_INT
+ && (unsigned HOST_WIDE_INT) INTVAL (trueop1) == GET_MODE_MASK (mode)
&& INTEGRAL_MODE_P (mode))
return const0_rtx;
break;
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:
abort ();
}
enum machine_mode mode, op0_mode;
rtx op0, op1, op2;
{
- int width = GET_MODE_BITSIZE (mode);
+ unsigned int width = GET_MODE_BITSIZE (mode);
/* VOIDmode means "infinite" precision. */
if (width == 0)
if (GET_CODE (op0) == CONST_INT
&& GET_CODE (op1) == CONST_INT
&& GET_CODE (op2) == CONST_INT
- && INTVAL (op1) + INTVAL (op2) <= GET_MODE_BITSIZE (op0_mode)
- && width <= HOST_BITS_PER_WIDE_INT)
+ && ((unsigned) INTVAL (op1) + (unsigned) INTVAL (op2) <= width)
+ && width <= (unsigned) HOST_BITS_PER_WIDE_INT)
{
/* Extracting a bit-field from a constant */
HOST_WIDE_INT val = INTVAL (op0);
/* Convert a == b ? b : a to "a". */
if (GET_CODE (op0) == NE && ! side_effects_p (op0)
+ && (! FLOAT_MODE_P (mode) || flag_unsafe_math_optimizations)
&& rtx_equal_p (XEXP (op0, 0), op1)
&& rtx_equal_p (XEXP (op0, 1), op2))
return op1;
else if (GET_CODE (op0) == EQ && ! side_effects_p (op0)
+ && (! FLOAT_MODE_P (mode) || flag_unsafe_math_optimizations)
&& rtx_equal_p (XEXP (op0, 1), op1)
&& rtx_equal_p (XEXP (op0, 0), op2))
return op2;
else if (GET_RTX_CLASS (GET_CODE (op0)) == '<' && ! side_effects_p (op0))
{
+ enum machine_mode cmp_mode = (GET_MODE (XEXP (op0, 0)) == VOIDmode
+ ? GET_MODE (XEXP (op0, 1))
+ : GET_MODE (XEXP (op0, 0)));
rtx temp;
- temp = simplify_relational_operation (GET_CODE (op0), op0_mode,
- XEXP (op0, 0), XEXP (op0, 1));
+ if (cmp_mode == VOIDmode)
+ cmp_mode = op0_mode;
+ temp = simplify_relational_operation (GET_CODE (op0), cmp_mode,
+ XEXP (op0, 0), XEXP (op0, 1));
+
/* See if any simplifications were possible. */
if (temp == const0_rtx)
return op2;
else if (temp == const1_rtx)
return op1;
+ else if (temp)
+ op0 = temp;
+
+ /* Look for happy constants in op1 and op2. */
+ if (GET_CODE (op1) == CONST_INT && GET_CODE (op2) == CONST_INT)
+ {
+ HOST_WIDE_INT t = INTVAL (op1);
+ HOST_WIDE_INT f = INTVAL (op2);
+
+ if (t == STORE_FLAG_VALUE && f == 0)
+ code = GET_CODE (op0);
+ else if (t == 0 && f == STORE_FLAG_VALUE)
+ {
+ enum rtx_code tmp;
+ tmp = reversed_comparison_code (op0, NULL_RTX);
+ if (tmp == UNKNOWN)
+ break;
+ code = tmp;
+ }
+ else
+ break;
+
+ return gen_rtx_fmt_ee (code, mode, XEXP (op0, 0), XEXP (op0, 1));
+ }
}
break;
return 0;
}
+/* Simplify SUBREG:OUTERMODE(OP:INNERMODE, BYTE)
+ Return 0 if no simplifications is possible. */
+rtx
+simplify_subreg (outermode, op, innermode, byte)
+ rtx op;
+ unsigned int byte;
+ enum machine_mode outermode, innermode;
+{
+ /* Little bit of sanity checking. */
+ if (innermode == VOIDmode || outermode == VOIDmode
+ || innermode == BLKmode || outermode == BLKmode)
+ abort ();
+
+ if (GET_MODE (op) != innermode
+ && GET_MODE (op) != VOIDmode)
+ abort ();
+
+ if (byte % GET_MODE_SIZE (outermode)
+ || byte >= GET_MODE_SIZE (innermode))
+ abort ();
+
+ if (outermode == innermode && !byte)
+ return op;
+
+ /* Attempt to simplify constant to non-SUBREG expression. */
+ if (CONSTANT_P (op))
+ {
+ int offset, part;
+ unsigned HOST_WIDE_INT val = 0;
+
+ /* ??? This code is partly redundant with code below, but can handle
+ the subregs of floats and similar corner cases.
+ Later it we should move all simplification code here and rewrite
+ GEN_LOWPART_IF_POSSIBLE, GEN_HIGHPART, OPERAND_SUBWORD and friends
+ using SIMPLIFY_SUBREG. */
+ if (subreg_lowpart_offset (outermode, innermode) == byte)
+ {
+ rtx new = gen_lowpart_if_possible (outermode, op);
+ if (new)
+ return new;
+ }
+
+ /* Similar comment as above apply here. */
+ if (GET_MODE_SIZE (outermode) == UNITS_PER_WORD
+ && GET_MODE_SIZE (innermode) > UNITS_PER_WORD
+ && GET_MODE_CLASS (outermode) == MODE_INT)
+ {
+ rtx new = constant_subword (op,
+ (byte / UNITS_PER_WORD),
+ innermode);
+ if (new)
+ return new;
+ }
+
+ offset = byte * BITS_PER_UNIT;
+ switch (GET_CODE (op))
+ {
+ case CONST_DOUBLE:
+ if (GET_MODE (op) != VOIDmode)
+ break;
+
+ /* We can't handle this case yet. */
+ if (GET_MODE_BITSIZE (outermode) >= HOST_BITS_PER_WIDE_INT)
+ return NULL_RTX;
+
+ part = offset >= HOST_BITS_PER_WIDE_INT;
+ if ((BITS_PER_WORD > HOST_BITS_PER_WIDE_INT
+ && BYTES_BIG_ENDIAN)
+ || (BITS_PER_WORD <= HOST_BITS_PER_WIDE_INT
+ && WORDS_BIG_ENDIAN))
+ part = !part;
+ val = part ? CONST_DOUBLE_HIGH (op) : CONST_DOUBLE_LOW (op);
+ offset %= HOST_BITS_PER_WIDE_INT;
+
+ /* We've already picked the word we want from a double, so
+ pretend this is actually an integer. */
+ innermode = mode_for_size (HOST_BITS_PER_WIDE_INT, MODE_INT, 0);
+
+ /* FALLTHROUGH */
+ case CONST_INT:
+ if (GET_CODE (op) == CONST_INT)
+ val = INTVAL (op);
+
+ /* We don't handle synthetizing of non-integral constants yet. */
+ if (GET_MODE_CLASS (outermode) != MODE_INT)
+ return NULL_RTX;
+
+ if (BYTES_BIG_ENDIAN || WORDS_BIG_ENDIAN)
+ {
+ if (WORDS_BIG_ENDIAN)
+ offset = (GET_MODE_BITSIZE (innermode)
+ - GET_MODE_BITSIZE (outermode) - offset);
+ if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
+ && GET_MODE_SIZE (outermode) < UNITS_PER_WORD)
+ offset = (offset + BITS_PER_WORD - GET_MODE_BITSIZE (outermode)
+ - 2 * (offset % BITS_PER_WORD));
+ }
+
+ if (offset >= HOST_BITS_PER_WIDE_INT)
+ return ((HOST_WIDE_INT) val < 0) ? constm1_rtx : const0_rtx;
+ else
+ {
+ val >>= offset;
+ if (GET_MODE_BITSIZE (outermode) < HOST_BITS_PER_WIDE_INT)
+ val = trunc_int_for_mode (val, outermode);
+ return GEN_INT (val);
+ }
+ default:
+ break;
+ }
+ }
+
+ /* Changing mode twice with SUBREG => just change it once,
+ or not at all if changing back op starting mode. */
+ if (GET_CODE (op) == SUBREG)
+ {
+ enum machine_mode innermostmode = GET_MODE (SUBREG_REG (op));
+ int final_offset = byte + SUBREG_BYTE (op);
+ rtx new;
+
+ if (outermode == innermostmode
+ && byte == 0 && SUBREG_BYTE (op) == 0)
+ return SUBREG_REG (op);
+
+ /* The SUBREG_BYTE represents offset, as if the value were stored
+ in memory. Irritating exception is paradoxical subreg, where
+ we define SUBREG_BYTE to be 0. On big endian machines, this
+ value should be negative. For a moment, undo this exception. */
+ 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;
+ }
+ if (SUBREG_BYTE (op) == 0
+ && GET_MODE_SIZE (innermostmode) < GET_MODE_SIZE (innermode))
+ {
+ int difference = (GET_MODE_SIZE (innermostmode) - GET_MODE_SIZE (innermode));
+ if (WORDS_BIG_ENDIAN)
+ final_offset += (difference / UNITS_PER_WORD) * UNITS_PER_WORD;
+ if (BYTES_BIG_ENDIAN)
+ final_offset += difference % UNITS_PER_WORD;
+ }
+
+ /* See whether resulting subreg will be paradoxical. */
+ if (GET_MODE_SIZE (innermostmode) > GET_MODE_SIZE (outermode))
+ {
+ /* In nonparadoxical subregs we can't handle negative offsets. */
+ if (final_offset < 0)
+ return NULL_RTX;
+ /* Bail out in case resulting subreg would be incorrect. */
+ if (final_offset % GET_MODE_SIZE (outermode)
+ || (unsigned) final_offset >= GET_MODE_SIZE (innermostmode))
+ return NULL_RTX;
+ }
+ else
+ {
+ int offset = 0;
+ int difference = (GET_MODE_SIZE (innermostmode) - GET_MODE_SIZE (outermode));
+
+ /* In paradoxical subreg, see if we are still looking on lower part.
+ If so, our SUBREG_BYTE will be 0. */
+ if (WORDS_BIG_ENDIAN)
+ offset += (difference / UNITS_PER_WORD) * UNITS_PER_WORD;
+ if (BYTES_BIG_ENDIAN)
+ offset += difference % UNITS_PER_WORD;
+ if (offset == final_offset)
+ final_offset = 0;
+ else
+ return NULL_RTX;
+ }
+
+ /* Recurse for futher possible simplifications. */
+ new = simplify_subreg (outermode, SUBREG_REG (op),
+ GET_MODE (SUBREG_REG (op)),
+ final_offset);
+ if (new)
+ return new;
+ return gen_rtx_SUBREG (outermode, SUBREG_REG (op), final_offset);
+ }
+
+ /* 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)
+ && (! REG_FUNCTION_VALUE_P (op)
+ || ! rtx_equal_function_value_matters)
+#ifdef CLASS_CANNOT_CHANGE_MODE
+ && ! (CLASS_CANNOT_CHANGE_MODE_P (outermode, innermode)
+ && GET_MODE_CLASS (innermode) != MODE_COMPLEX_INT
+ && GET_MODE_CLASS (innermode) != MODE_COMPLEX_FLOAT
+ && (TEST_HARD_REG_BIT
+ (reg_class_contents[(int) CLASS_CANNOT_CHANGE_MODE],
+ REGNO (op))))
+#endif
+ && REGNO (op) < FIRST_PSEUDO_REGISTER
+ && ((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)
+ {
+ int final_regno = subreg_hard_regno (gen_rtx_SUBREG (outermode, op, byte),
+ 0);
+
+ /* ??? 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 (op), innermode))
+ {
+ rtx x = gen_rtx_REG (outermode, final_regno);
+
+ /* Propagate original regno. We don't have any way to specify
+ the offset inside orignal regno, so do so only for lowpart.
+ The information is used only by alias analysis that can not
+ grog partial register anyway. */
+
+ if (subreg_lowpart_offset (outermode, innermode) == byte)
+ ORIGINAL_REGNO (x) = ORIGINAL_REGNO (op);
+ return x;
+ }
+ }
+
+ /* If we have a SUBREG of a register that we are replacing and we are
+ replacing it with a MEM, make a new MEM and try replacing the
+ SUBREG with it. Don't do this if the MEM has a mode-dependent address
+ or if we would be widening it. */
+
+ if (GET_CODE (op) == MEM
+ && ! mode_dependent_address_p (XEXP (op, 0))
+ /* Allow splitting of volatile memory references in case we don't
+ have instruction to move the whole thing. */
+ && (! MEM_VOLATILE_P (op)
+ || ! have_insn_for (SET, innermode))
+ && GET_MODE_SIZE (outermode) <= GET_MODE_SIZE (GET_MODE (op)))
+ return adjust_address_nv (op, outermode, byte);
+
+ /* Handle complex values represented as CONCAT
+ of real and imaginary part. */
+ if (GET_CODE (op) == CONCAT)
+ {
+ int is_realpart = byte < GET_MODE_UNIT_SIZE (innermode);
+ rtx part = is_realpart ? XEXP (op, 0) : XEXP (op, 1);
+ unsigned int final_offset;
+ rtx res;
+
+ final_offset = byte % (GET_MODE_UNIT_SIZE (innermode));
+ res = simplify_subreg (outermode, part, GET_MODE (part), final_offset);
+ if (res)
+ return res;
+ /* We can at least simplify it by referring directly to the relevant part. */
+ return gen_rtx_SUBREG (outermode, part, final_offset);
+ }
+
+ return NULL_RTX;
+}
+/* Make a SUBREG operation or equivalent if it folds. */
+
+rtx
+simplify_gen_subreg (outermode, op, innermode, byte)
+ rtx op;
+ unsigned int byte;
+ enum machine_mode outermode, innermode;
+{
+ rtx new;
+ /* Little bit of sanity checking. */
+ if (innermode == VOIDmode || outermode == VOIDmode
+ || innermode == BLKmode || outermode == BLKmode)
+ abort ();
+
+ if (GET_MODE (op) != innermode
+ && GET_MODE (op) != VOIDmode)
+ abort ();
+
+ if (byte % GET_MODE_SIZE (outermode)
+ || byte >= GET_MODE_SIZE (innermode))
+ abort ();
+
+ if (GET_CODE (op) == QUEUED)
+ return NULL_RTX;
+
+ new = simplify_subreg (outermode, op, innermode, byte);
+ if (new)
+ return new;
+
+ if (GET_CODE (op) == SUBREG || GET_MODE (op) == VOIDmode)
+ return NULL_RTX;
+
+ return gen_rtx_SUBREG (outermode, op, byte);
+}
/* Simplify X, an rtx expression.
Return the simplified expression or NULL if no simplifications
simplify_rtx (x)
rtx x;
{
- enum rtx_code code;
- enum machine_mode mode;
- rtx new;
-
- mode = GET_MODE (x);
- code = GET_CODE (x);
+ enum rtx_code code = GET_CODE (x);
+ enum machine_mode mode = GET_MODE (x);
switch (GET_RTX_CLASS (code))
{
case '1':
return simplify_unary_operation (code, mode,
XEXP (x, 0), GET_MODE (XEXP (x, 0)));
- case '2':
case 'c':
+ if (swap_commutative_operands_p (XEXP (x, 0), XEXP (x, 1)))
+ {
+ rtx tem;
+
+ tem = XEXP (x, 0);
+ XEXP (x, 0) = XEXP (x, 1);
+ XEXP (x, 1) = tem;
+ return simplify_binary_operation (code, mode,
+ XEXP (x, 0), XEXP (x, 1));
+ }
+
+ case '2':
return simplify_binary_operation (code, mode, XEXP (x, 0), XEXP (x, 1));
case '3':
case 'b':
return simplify_ternary_operation (code, mode, GET_MODE (XEXP (x, 0)),
- XEXP (x, 0), XEXP (x, 1), XEXP (x, 2));
+ XEXP (x, 0), XEXP (x, 1),
+ XEXP (x, 2));
case '<':
- return simplify_relational_operation (code, GET_MODE (XEXP (x, 0)),
+ return simplify_relational_operation (code,
+ ((GET_MODE (XEXP (x, 0))
+ != VOIDmode)
+ ? GET_MODE (XEXP (x, 0))
+ : GET_MODE (XEXP (x, 1))),
XEXP (x, 0), XEXP (x, 1));
+ case 'x':
+ /* The only case we try to handle is a SUBREG. */
+ if (code == SUBREG)
+ return simplify_gen_subreg (mode, SUBREG_REG (x),
+ GET_MODE (SUBREG_REG (x)),
+ SUBREG_BYTE (x));
+ return NULL;
default:
return NULL;
}
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