https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67242
Bug ID: 67242
Summary: Missing optimization with float
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: f.boesing at gmx dot de
Target Milestone: ---
testcase:
int n, dummy;
float dummyfloat;
void bug(void)
{
for(n=0; n<1000; n++)
dummy = n;
for(n=0; n<1000; n++)
dummyfloat = n;
}
the first loop (dummy=) is optimized away with -O2 and -O3
the second (dummyfloat=) NOT.
Tested with 4.9.2 & 4.9.3, targets x86-64, arm-thumb and arm.
commandline: gcc -O2 bug.c -S
