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re PR tree-optimization/44977 (ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728)

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2010-07-20  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/44977
	* tree-ssa-dom.c (propagate_rhs_into_lhs): Do not create invalid
	SSA form.

	* gcc.dg/torture/pr44977.c: New testcase.

From-SVN: r162334
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Richard Guenther 2010-07-20 12:41:20 +00:00 committed by Richard Biener
parent cd2be65a3b
commit 720151cabd
4 changed files with 66 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2010-07-20 Richard Guenther <rguenther@suse.de>
PR tree-optimization/44977
* tree-ssa-dom.c (propagate_rhs_into_lhs): Do not create invalid
SSA form.
2010-07-20 Richard Guenther <rguenther@suse.de>
* lto-symtab.c (lto_symtab_merge): Use gimple_types_compatible_p.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2010-07-20 Richard Guenther <rguenther@suse.de>
PR tree-optimization/44977
* gcc.dg/torture/pr44977.c: New testcase.
2010-07-20 Bingfeng Mei <bmei@broadcom.com>
* gcc.dg/lto/20090313_0.c: Use dg-require-effective-target

41
gcc/testsuite/gcc.dg/torture/pr44977.c Normal file
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@ -0,0 +1,41 @@
/* { dg-do compile } */
/* { dg-options "-w" } */
static unsigned short
foo (unsigned short ui1, unsigned short ui2)
{
return ui1 - ui2;
}
static unsigned short
bar (unsigned ui1, unsigned short ui2)
{
return ui1 + ui2;
}
struct S1
{
const short f3;
};
int g_31;
short g_67;
struct S1 g_68[2][5][9][1][1] = {
};
int func_90 (int);
int int329 (int * const *const int32p_81, short ** p_82)
{
short l_169[8];
for (g_31 = 0; g_31 <= 0; g_31 = foo (g_31, 1))
{
short l_85;
lbl_89:g_67 ^= l_85;
for (l_85 = 0; l_85 >= 0; l_85 = bar)
if (g_31)
goto lbl_89;
func_90 (1), g_68[0][2][2][0][0].f3, 0;
}
return l_169[6];
}

14
gcc/tree-ssa-dom.c
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@ -2559,6 +2559,20 @@ propagate_rhs_into_lhs (gimple stmt, tree lhs, tree rhs, bitmap interesting_name
continue;
}
/* It's not ok to propagate into the definition stmt of RHS.
<bb 9>:
# prephitmp.12_36 = PHI <g_67.1_6(9)>
g_67.1_6 = prephitmp.12_36;
goto <bb 9>;
While this is strictly all dead code we do not want to
deal with this here. */
if (TREE_CODE (rhs) == SSA_NAME
&& SSA_NAME_DEF_STMT (rhs) == use_stmt)
{
all = false;
continue;
}
/* Dump details. */
if (dump_file && (dump_flags & TDF_DETAILS))
{