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[Bug tree-optimization/17247] New: [3.5 Regression] TER is not always doing its job
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 31 Aug 2004 06:32:49 -0000
- Subject: [Bug tree-optimization/17247] New: [3.5 Regression] TER is not always doing its job
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
I finnally was able to analyzed why gcc.dg/rs6000-power2-2.c was failing and noticed that TER was
not doing its job in combining back T.1 = *(a+-1*8); into t = T.1; why I don't know.
Here is the reduced testcase:
register double t1 __asm__("fr1");
void t(double *a, double *b)
{
t1 = a[-1];
b[-1] = t1;
}
Compile with "gcc -O3 -S -o - t.c -w" to see the problem.
Can also see the problem with the following source on any target if you look into the *.var file:
double t1;
void t(double *a, double *b)
{
t1 = a[-1];
b[-1] = t1;
}
--
Summary: [3.5 Regression] TER is not always doing its job
Product: gcc
Version: 3.5.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: critical
Priority: P2
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: powerpc-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17247