https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113078
Bug ID: 113078
Summary: [14 regression] reduction of cond_sub is not
vectorized.
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: liuhongt at gcc dot gnu.org
Target Milestone: ---
int
foo (int n, int* p, int* pi)
{
int sum = 0;
for (int i = 0; i != n; i++)
{
if (pi[i] > 0)
sum -= p[i];
}
return sum;
}
gcc 13 can vectorize it, but latest trunk don't, guess it's related to
optimiztion of COND_OP in ifcvt.
/app/example.cpp:5:23: note: vect_is_simple_use: vectype vector(8) int
/app/example.cpp:5:23: missed: reduction: not commutative/associative
/app/example.cpp:2:1: missed: not vectorized: relevant phi not supported:
sum_18 = PHI <_ifc__32(8), 0(18)>
/app/example.cpp:5:23: missed: bad operation or unsupported loop bound.
