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[Bug tree-optimization/20643] [4.0/4.1/4.2 Regression] Tree loop optimizer does worse job than RTL loop optimizer
- From: "anemo at mba dot ocn dot ne dot jp" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 16 Jul 2006 13:21:18 -0000
- Subject: [Bug tree-optimization/20643] [4.0/4.1/4.2 Regression] Tree loop optimizer does worse job than RTL loop optimizer
- References: <bug-20643-3107@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #11 from anemo at mba dot ocn dot ne dot jp 2006-07-16 13:21 -------
I have a similer optimization problem with this tiny function.
void foo(int *a)
{
int i;
for (i = 0; i < 100; i++)
a[0] += a[1];
}
All gcc 4.x I tried generate load and store in inner loop.
On http://gcc.gnu.org/ml/gcc/2006-07/msg00282.html, I posted some results.
Is this a same probelm? If not, I should file another bug report. Thank you.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20643