https://llvm.org/bugs/show_bug.cgi?id=27643
Bug ID: 27643
Summary: [LV] Loop vectorizer does not respect vectorize_width
pragma at -Os/-Oz
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
When optimizing for size, the loop vectorizer chooses to not vectorize the
simple loop below due to the required run-time checks.
void f(int *a, int *b, int n) {
for (int i = 0; i < n; ++i)
a[i] = b[i];
}
Comments in the source suggest that vectorization can be forced with pragmas.
"#pragma clang loop vectorize(enable)" does indeed force vectorization, but
"#pragma clang loop vectorize_width(4)" does not. Specifying the width is
supposed to implicitly enable vectorization.
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