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re PR middle-end/18921 (wrong code with operator "?")

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PR middle-end/18921
	* fold-const.c (fold_unwidened_comparison): Use omit_one_operand
	instead of constant_boolean_node as arg0 may have side-effects.

	* gcc.dg/pr18921-1.c: New test case.

From-SVN: r92030
This commit is contained in:
Roger Sayle 2004-12-11 13:46:37 +00:00 committed by Roger Sayle
parent 49e4d5803e
commit ec7e2228d1
4 changed files with 37 additions and 6 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2004-12-11 Roger Sayle <roger@eyesopen.com>
PR middle-end/18921
* fold-const.c (fold_unwidened_comparison): Use omit_one_operand
instead of constant_boolean_node as arg0 may have side-effects.
2004-12-10 John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
* pa-host.c (pa_gt_pch_use_address): Use lseek and read to copy PCH

12
gcc/fold-const.c
View File

@ -6023,27 +6023,27 @@ fold_widened_comparison (enum tree_code code, tree type, tree arg0, tree arg1)
{
case EQ_EXPR:
if (above || below)
return constant_boolean_node (false, type);
return omit_one_operand (type, integer_zero_node, arg0);
break;
case NE_EXPR:
if (above || below)
return constant_boolean_node (true, type);
return omit_one_operand (type, integer_one_node, arg0);
break;
case LT_EXPR:
case LE_EXPR:
if (above)
return constant_boolean_node (true, type);
return omit_one_operand (type, integer_one_node, arg0);
else if (below)
return constant_boolean_node (false, type);;
return omit_one_operand (type, integer_zero_node, arg0);
case GT_EXPR:
case GE_EXPR:
if (above)
return constant_boolean_node (false, type);
return omit_one_operand (type, integer_zero_node, arg0);
else if (below)
return constant_boolean_node (true, type);;
return omit_one_operand (type, integer_one_node, arg0);
default:
break;

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2004-12-11 Roger Sayle <roger@eyesopen.com>
PR middle-end/18921
* gcc.dg/pr18921-1.c: New test case.
2004-12-11 Tobias Schlueter <tobias.schlueter@physik.uni-muenchen.de>
PR fortran/17175

20
gcc/testsuite/gcc.dg/pr18921-1.c Normal file
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@ -0,0 +1,20 @@
/* PR middle-end/18921 */
/* { dg-do run } */
/* { dg-options "-O2" } */
extern void abort (void);
int foo (int k)
{
unsigned char j = 0;
(k ? 0 : j++) == -1;
return j;
}
int main ()
{
if (!foo (0))
abort ();
return 0;
}