https://bugs.llvm.org/show_bug.cgi?id=43553
Bug ID: 43553
Summary: SLP vectorizer doesn't obey
llvm.loop.vectorize.width=1
Product: libraries
Version: 9.0
Hardware: Other
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: husseyde...@gmail.com
CC: llvm-bugs@lists.llvm.org
Follow up to bug 43539. Code example is there.
The SLP vectorizer (plus any other passes that emit SIMD code) should always
obey the llvm.loop.vectorize.width=1 (emitted by #pragma clang loop
vectorize(disable)) or llvm.loop.vectorize.enable=false.
Currently, what happens on non-trivial loops is that the loop optimizer will
unroll (and/or interleave) the loop, and SLP will vectorize the unrolled loop.
Enabled or disabled, the loop ends up being vectorized, making this
annotation/pragma useless.
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