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re PR c/44555 (Pointer evalutions, is that expected ?) 

2010-07-27  Richard Guenther  <rguenther@suse.de>

	PR c/44555
	* c-common.c (c_common_truthvalue_conversion): Remove
	premature and wrong optimization concering ADDR_EXPRs.

	* gcc.c-torture/execute/pr44555.c: New testcase.

From-SVN: r162566
This commit is contained in:
Richard Guenther 2010-07-27 13:07:28 +00:00 committed by Richard Biener
parent aa8f9a5e14
commit 266e437ca9
4 changed files with 28 additions and 14 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2010-07-27 Richard Guenther <rguenther@suse.de>
PR c/44555
* c-common.c (c_common_truthvalue_conversion): Remove
premature and wrong optimization concering ADDR_EXPRs.
2010-07-27 Richard Guenther <rguenther@suse.de>
PR tree-optimization/44977

15
gcc/c-common.c
View File

@ -3397,20 +3397,7 @@ c_common_truthvalue_conversion (location_t location, tree expr)
inner);
return truthvalue_true_node;
}
/* If we still have a decl, it is possible for its address to
be NULL, so we cannot optimize. */
if (DECL_P (inner))
{
gcc_assert (DECL_WEAK (inner));
break;
}
if (TREE_SIDE_EFFECTS (inner))
return build2 (COMPOUND_EXPR, truthvalue_type_node,
inner, truthvalue_true_node);
else
return truthvalue_true_node;
break;
}
case COMPLEX_EXPR:

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2010-07-27 Richard Guenther <rguenther@suse.de>
PR c/44555
* gcc.c-torture/execute/pr44555.c: New testcase.
2010-07-27 Richard Guenther <rguenther@suse.de>
PR tree-optimization/44977

16
gcc/testsuite/gcc.c-torture/execute/pr44555.c Normal file
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@ -0,0 +1,16 @@
struct a {
char b[100];
};
int foo(struct a *a)
{
if (&a->b)
return 1;
return 0;
}
extern void abort (void);
int main()
{
if (foo((struct a *)0) != 0)
abort ();
return 0;
}