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re PR rtl-optimization/38774 (ice in df_refs_verify, at df-scan.c:4307)

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PR rtl-optimization/38774
	* combine.c (simplify_set): When undoing cc_use change, don't do
	PUT_CODE on the newly created comparison, but instead put back the
	old comparison.

	* gcc.dg/torture/pr38774.c: New test.

From-SVN: r143355
This commit is contained in:
Jakub Jelinek 2009-01-13 23:36:06 +01:00 committed by Jakub Jelinek
parent 7ab23fd0b9
commit d3302fd318
4 changed files with 28 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2009-01-13 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/38774
* combine.c (simplify_set): When undoing cc_use change, don't do
PUT_CODE on the newly created comparison, but instead put back the
old comparison.
2009-01-13 Joseph Myers <joseph@codesourcery.com>
* doc/invoke.texi (ARM Options): Update lists of -mcpu and -march

3
gcc/combine.c
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@ -5706,6 +5706,7 @@ simplify_set (rtx x)
{
int other_changed_previously = other_changed;
unsigned HOST_WIDE_INT mask;
rtx old_cc_use = *cc_use;
SUBST (*cc_use, gen_rtx_fmt_ee (new_code, GET_MODE (*cc_use),
dest, const0_rtx));
@ -5728,7 +5729,7 @@ simplify_set (rtx x)
if ((recog_for_combine (&pat, other_insn, &note) < 0
&& ! check_asm_operands (pat)))
{
PUT_CODE (*cc_use, old_code);
*cc_use = old_cc_use;
other_changed = 0;
op0 = simplify_gen_binary (XOR, GET_MODE (op0),

3
gcc/testsuite/ChangeLog
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@ -1,5 +1,8 @@
2009-01-13 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/38774
* gcc.dg/torture/pr38774.c: New test.
PR c++/38795
* g++.dg/cpp0x/pr38795.C: New test.

16
gcc/testsuite/gcc.dg/torture/pr38774.c Normal file
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@ -0,0 +1,16 @@
/* PR rtl-optimization/38774 */
/* { dg-do compile } */
/* { dg-options "" } */
/* { dg-options "-march=i686" { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
extern int bar (void);
volatile int g;
int
foo (void)
{
int a = 1 >= bar ();
if ((1 > 9223372036854775807LL - a && 1 - a ? : 1 + a) & 1)
return g;
return 0;
}