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Differential D56246

[X86] Add post-isel peephole to fold KAND+KORTEST into KTEST if only the zero flag is used.
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Authored by craig.topper on Jan 2 2019, 11:23 PM.

Details

Reviewers
RKSimon
spatel
andreadb
Commits
rG6265a15f2e7a: [X86] Add post-isel peephole to fold KAND+KORTEST into KTEST if only the zero…
rL350374: [X86] Add post-isel peephole to fold KAND+KORTEST into KTEST if only the zero…
Summary

Doing this late so we will prefer to fold the AND into a masked comparison first. That can be better for the live range of the mask register.

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Repository
rL LLVM

Event Timeline

craig.topper created this revision.Jan 2 2019, 11:23 PM
Harbormaster completed remote builds in B26349: Diff 180000.Jan 2 2019, 11:23 PM
RKSimon accepted this revision.Jan 3 2019, 7:31 AM

LGTM

This revision is now accepted and ready to land.Jan 3 2019, 7:31 AM
Closed by commit rL350374: [X86] Add post-isel peephole to fold KAND+KORTEST into KTEST if only the zero… (authored by ctopper). · Explain WhyJan 3 2019, 4:14 PM
This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

PathSize
llvm/
trunk/
lib/
Target/
X86/
35 lines
test/
CodeGen/
X86/
147 lines

Diff 180172

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llvm/trunk/lib/Target/X86/X86ISelDAGToDAG.cpp

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llvm/trunk/test/CodeGen/X86/avx512-mask-op.ll

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