https://llvm.org/bugs/show_bug.cgi?id=25748
Bug ID: 25748
Summary: LLVM cannot vectorize short reduction loop.
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: co...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
LLVM fails to vectoize the following reduction loop. The loop is unrolled
before reaching loop vectorizer, and the SLP vectorizer cannot vectorize it.
int a[32];
int reduce_add() {
int s = 0;
for (int i = 0; i < 32; ++i)
s = s + a[i];
return s;
}
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