https://bugs.llvm.org/show_bug.cgi?id=40961
Bug ID: 40961
Summary: loop vectorizer unable to reason with trip count
bounds
Product: libraries
Version: trunk
Hardware: Other
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: ois...@gmail.com
CC: llvm-bugs@lists.llvm.org
I see bugs 38280, 37423, but this one is simpler still. Consider the following:
void topup(int a[], unsigned long i)
{
for (; i < 16; i++) {
a[i] = 1;
}
}
The result, compiled with -O -march=haswell
- loop is vectorized despite the small absolute limit on trip count
- vectorized part has loop step of 256 (!) and is actually unreachable
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