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combine.c (SHIFT_COUNT_TRUNCATED): Provide default value. 

* combine.c (SHIFT_COUNT_TRUNCATED): Provide default value.
        (simplify_comparison): Don't simplify (eq (zero_extract c 1 r) 0)
        if SHIFT_COUNT_TRUNCATED is set.

From-SVN: r76461
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Richard Henderson 2004-01-23 14:23:10 -08:00 committed by Richard Henderson
parent 3712281f9d
commit a475bff7f8
2 changed files with 15 additions and 7 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2004-01-23 Richard Henderson <rth@redhat.com>
PR opt/12941
* combine.c (SHIFT_COUNT_TRUNCATED): Provide default value.
(simplify_comparison): Don't simplify (eq (zero_extract c 1 r) 0)
if SHIFT_COUNT_TRUNCATED is set.
2004-01-23 Bob Wilson <bob.wilson@acm.org>
* config/xtensa/xtensa.c (xtensa_va_arg): Handle complex values as

15
gcc/combine.c
View File

@ -91,6 +91,10 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
#include "toplev.h"
#include "target.h"
#ifndef SHIFT_COUNT_TRUNCATED
#define SHIFT_COUNT_TRUNCATED 0
#endif
/* It is not safe to use ordinary gen_lowpart in combine.
Use gen_lowpart_for_combine instead. See comments there. */
#define gen_lowpart dont_use_gen_lowpart_you_dummy
@ -4545,7 +4549,6 @@ combine_simplify_rtx (rtx x, enum machine_mode op0_mode, int last,
return simplify_shift_const (x, code, mode, XEXP (x, 0),
INTVAL (XEXP (x, 1)));
#ifdef SHIFT_COUNT_TRUNCATED
else if (SHIFT_COUNT_TRUNCATED && GET_CODE (XEXP (x, 1)) != REG)
SUBST (XEXP (x, 1),
force_to_mode (XEXP (x, 1), GET_MODE (XEXP (x, 1)),
@ -4553,8 +4556,6 @@ combine_simplify_rtx (rtx x, enum machine_mode op0_mode, int last,
<< exact_log2 (GET_MODE_BITSIZE (GET_MODE (x))))
- 1,
NULL_RTX, 0));
#endif
break;
case VEC_SELECT:
@ -9124,10 +9125,8 @@ simplify_shift_const (rtx x, enum rtx_code code,
/* Make sure and truncate the "natural" shift on the way in. We don't
want to do this inside the loop as it makes it more difficult to
combine shifts. */
#ifdef SHIFT_COUNT_TRUNCATED
if (SHIFT_COUNT_TRUNCATED)
orig_count &= GET_MODE_BITSIZE (mode) - 1;
#endif
/* If we were given an invalid count, don't do anything except exactly
what was requested. */
@ -10523,8 +10522,10 @@ simplify_comparison (enum rtx_code code, rtx *pop0, rtx *pop1)
a constant that has only a single bit set and are comparing it
with zero, we can convert this into an equality comparison
between the position and the location of the single bit. */
if (GET_CODE (XEXP (op0, 0)) == CONST_INT
/* Except we can't if SHIFT_COUNT_TRUNCATED is set, since we might
have already reduced the shift count modulo the word size. */
if (!SHIFT_COUNT_TRUNCATED
&& GET_CODE (XEXP (op0, 0)) == CONST_INT
&& XEXP (op0, 1) == const1_rtx
&& equality_comparison_p && const_op == 0
&& (i = exact_log2 (INTVAL (XEXP (op0, 0)))) >= 0)