[PATCH] D59484: [TargetLowering] Add SimplifyDemandedBits support for ISD::INSERT_VECTOR_ELT
Nikita Popov via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sun Mar 24 13:50:07 PDT 2019
nikic added inline comments.
================
Comment at: lib/CodeGen/SelectionDAG/TargetLowering.cpp:578
+
+ if (!!DemandedVecElts)
+ if (SimplifyDemandedBits(Vec, OriginalDemandedBits, DemandedVecElts,
----------------
Why is this check necessary? If there are no demanded elements, wouldn't this allow folding the input vector to undef?
Repository:
rL LLVM
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D59484/new/
https://reviews.llvm.org/D59484
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