https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103999
Bug ID: 103999
Summary: Vectorizer failed to reduce sum with conversion.
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: crazylht at gmail dot com
Target Milestone: ---
Vectorizer failed for sum_reduce_cd, but ok for sum_reduce/sum_reduce_cint
float sum_reduce_cd (int n, float* array)
{
float ans = 0.0f, x;
for (int i = 0; i != n; i++)
{
x = array[i];
ans += x + 1.0;
}
return ans;
}
float sum_reduce (int n, float* array)
{
float ans = 0.0f, x;
for (int i = 0; i != n; i++)
{
x = array[i];
ans += x + 1.0f;
}
return ans;
}
float sum_reduce_cint (int n, float* array)
{
int ans = 0;
float x;
for (int i = 0; i != n; i++)
{
x = array[i];
ans += (int)(x + 1.0);
}
return ans;
}
https://godbolt.org/z/q3McP6d15
