[PATCH] D118144: [GVN] Support chain of phi nodes in exit blocks.
Florian Hahn via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Jan 28 14:11:08 PST 2022
fhahn updated this revision to Diff 404161.
fhahn added a comment.
A major rewrite/update following @reames' suggestion in D118143 <https://reviews.llvm.org/D118143> as extension to the available value analysis. This patch now tries to find an existing value-select that can be used instead of loading from a pointer-select. The first version is intentionally kept quite restrictive and can be extended through follow-ups.
Together with D118143 <https://reviews.llvm.org/D118143>, this enables vectorization for common code like `std::min_element`, yielding substantial speedups for code that uses it for non-tiny numbers of elements.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D118144/new/
https://reviews.llvm.org/D118144
Files:
llvm/lib/Transforms/Scalar/GVN.cpp
llvm/test/Transforms/GVN/PRE/pre-loop-load-through-select.ll
llvm/test/Transforms/GVN/load-of-pointer-select-available.ll
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