https://bugs.llvm.org/show_bug.cgi?id=38330
Bug ID: 38330
Summary: Missing vectorization for step 4
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Hello,
Code:
int vec_step_four(int *restrict A, int *restrict B, int *restrict C, int N) {
int sum = 0;
for (int i = 0; i < N; i += 4) {
C[i] = A[i] + B[i];
sum += C[i];
}
return sum;
}
Clang -O3 currently cannot vectorize this loop.
https://godbolt.org/g/NSHVVL
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