https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110428
Bug ID: 110428
Summary: missed CSE with VLA vectors
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
#include <stdint.h>
void __attribute__((noinline,noclone))
foo (uint16_t *out, uint16_t *res)
{
int mask[] = { 0, 1, 1, 1, 1, 1, 1, 1 };
int i;
for (i = 0; i < 8; ++i)
{
if (mask[i])
out[i] = 33;
}
uint16_t o0 = out[0];
uint16_t o7 = out[3];
uint16_t o14 = out[6];
uint16_t o15 = out[7];
res[0] = o0;
res[2] = o7;
res[4] = o14;
res[6] = o15;
}
With -march=armv9.3-a -O3 -g0 -fno-vect-cost-model we fail to CSE the
out[] loads after vectorization.
