https://bugs.llvm.org/show_bug.cgi?id=52038
Bug ID: 52038
Summary: Missed loop vectorization with reduction and ptr
load/store inside loop
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
void test1(int *p, int *t, int N) {
for (int i = 0; i != N; i++) *t += p[i];
}
void test2(int *p, int *t, int N) {
if (N > 1024) // hint, N is not small
for (int i = 0; i != N; i++) *t += p[i];
}
void test3(int *p, int *t, int N) {
if (N > 1024) { // hint, N is not small
int s = 0;
for (int i = 0; i != N; i++) s += p[i];
*t += s;
}
}
test3 is successfully vectorized with LLVM, GCC, ICC. Sadly, only ICC can catch
test1 and test2.
https://godbolt.org/z/PzoYd4eEK
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