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Differential D148855

[SLP]Improve tryToGatherExtractElements by using per-register analysis.
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Authored by ABataev on Apr 20 2023, 4:04 PM.

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• pcwang-thead

Details

Reviewers

RKSimon
vdmitrie
dmgreen

Summary

Currently tryToGatherExtractElements function analyzes the whole vector,
regrdless number of actual registers, used in this vector. It may
prevent some optimizations, because per-register analysis may allow to
simplify the final code by reusing more already emitted vectors and
better shuffles.

Diff Detail

Repository: rG LLVM Github Monorepo

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ABataev created this revision.Apr 20 2023, 4:04 PM

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ABataev requested review of this revision.Apr 20 2023, 4:04 PM

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Revision Contents
Changeset List

Path

Size

llvm/

lib/

Transforms/

Vectorize/

SLPVectorizer.cpp

427 lines

test/

Transforms/

SLPVectorizer/

AArch64/

extractelements-to-shuffle.ll

135 lines

X86/

hadd-inseltpoison.ll

140 lines

140 lines

hsub-inseltpoison.ll

140 lines

140 lines

reduction-transpose.ll

32 lines

Diff 556448

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

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llvm/test/Transforms/SLPVectorizer/AArch64/extractelements-to-shuffle.ll

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llvm/test/Transforms/SLPVectorizer/X86/hadd-inseltpoison.ll

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llvm/test/Transforms/SLPVectorizer/X86/hadd.ll

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llvm/test/Transforms/SLPVectorizer/X86/hsub-inseltpoison.ll

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llvm/test/Transforms/SLPVectorizer/X86/hsub.ll

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llvm/test/Transforms/SLPVectorizer/X86/reduction-transpose.ll

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