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fold-const.c (fold_widened_comparison): Do not allow sign-changes that change the result. 

2008-04-08  Richard Guenther  <rguenther@suse.de>

	* fold-const.c (fold_widened_comparison): Do not allow
	sign-changes that change the result.

	* gcc.c-torture/execute/20080408-1.c: New testcase.

From-SVN: r134108
This commit is contained in:
Richard Guenther 2008-04-08 21:57:43 +00:00 committed by Richard Biener
parent a0f3928210
commit 02765a37a1
4 changed files with 25 additions and 1 deletions
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5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2008-04-08 Richard Guenther <rguenther@suse.de>
* fold-const.c (fold_widened_comparison): Do not allow
sign-changes that change the result.
2008-04-08 Janis Johnson <janis187@us.ibm.com>
PR target/35839

6
gcc/fold-const.c
View File

@ -6721,7 +6721,11 @@ fold_widened_comparison (enum tree_code code, tree type, tree arg0, tree arg1)
|| TYPE_UNSIGNED (TREE_TYPE (arg0)) == TYPE_UNSIGNED (shorter_type))
&& (TREE_TYPE (arg1_unw) == shorter_type
|| (TYPE_PRECISION (shorter_type)
>= TYPE_PRECISION (TREE_TYPE (arg1_unw)))
> TYPE_PRECISION (TREE_TYPE (arg1_unw)))
|| ((TYPE_PRECISION (shorter_type)
== TYPE_PRECISION (TREE_TYPE (arg1_unw)))
&& (TYPE_UNSIGNED (shorter_type)
== TYPE_UNSIGNED (TREE_TYPE (arg1_unw))))
|| (TREE_CODE (arg1_unw) == INTEGER_CST
&& (TREE_CODE (shorter_type) == INTEGER_TYPE
|| TREE_CODE (shorter_type) == BOOLEAN_TYPE)

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2008-04-08 Richard Guenther <rguenther@suse.de>
* gcc.c-torture/execute/20080408-1.c: New testcase.
2008-04-08 Eric Botcazou <ebotcazou@adacore.com>
* gnat.dg/pack6.adb: New test.

11
gcc/testsuite/gcc.c-torture/execute/20080408-1.c Normal file
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@ -0,0 +1,11 @@
extern void abort (void);
int main ()
{
short ssi = 126;
unsigned short usi = 65280;
int fail = !(ssi < usi);
if (fail)
abort ();
return 0;
}