[PATCH] D79987: [DAG] SimplifyDemandedVectorElts Bug fix for rG7cb5a51f386d

Mon May 18 08:01:47 PDT 2020

RKSimon added a comment.

I'm still looking at fixing getFauxShuffleMask (PR45974) but that might take a while, so this sort of approach is probably necessary.

Did you investigate replacing getTargetShuffleInputs with getTargetShuffleAndZeroables in the SimplifyDemandedBitsForTargetNode/SimplifyDemandedVectorEltsForTargetNode?

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Comment at: llvm/test/CodeGen/X86/simplifydemandedvectorselts-broadcast.ll:2
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mcpu=core-avx2 | FileCheck %s
+
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-use -mattr=+avx2 instead of -mcpu=core-avx2

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https://reviews.llvm.org/D79987