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[Bug tree-optimization/45397] [4.5/4.6/4.7/4.8 Regression] Issues with integer narrowing conversions
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 02 Mar 2012 09:36:52 +0000
- Subject: [Bug tree-optimization/45397] [4.5/4.6/4.7/4.8 Regression] Issues with integer narrowing conversions
- Auto-submitted: auto-generated
- References: <bug-45397-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45397
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-02 09:36:52 UTC ---
Another testcase (lightly based on PR50182), -O3 -mavx:
signed char a[1024], b[1024];
void
foo (void)
{
int i, s, t;
for (i = 0; i < 1024; i++)
{ s = a[i]; t = b[i]; s += t; a[i] = s; }
}
void
bar (void)
{
int i;
for (i = 0; i < 1024; i++)
a[i] += b[i];
}
shows terrible code for the first loop and nice for the second one, eventhough
both can be implemented as the second loop.