[PATCH] D98059: [AArch64][GlobalISel] Form G_DUPLANE32 for <2 x s32> shufflevectors in lowering.

[Amara Emerson via Phabricator via llvm-commits]

aemerson created this revision.
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For <2 x s32>, we can use G_DUPLANE32, but with a <4 x s32> source. To make it work, we can just widen the original source with a concat_vectors.

Doing this allows <2 x float> indexed fmul instruction selection patterns to fire, which gives a nice 0.3% code size saving on Bullet with -Os.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D98059

Files:
  llvm/lib/Target/AArch64/GISel/AArch64PostLegalizerLowering.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/postlegalizer-lowering-shuffle-duplane.mir
  llvm/test/CodeGen/AArch64/GlobalISel/select-fmul-indexed.mir

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