[PATCH] D88191: [AArch64][GlobalISel] Use custom legalization for G_TRUNC for v8i8 vectors

[Amara Emerson via Phabricator via llvm-commits]

aemerson created this revision.
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Truncating to v8i8 is a case where we want to split the source but also generate intermediate truncates to reduce the size of the source vector before truncating down to v8i8. This implements the same strategy as what SelectionDAG does, but I'm not certain where if anywhere in generic code it should live.

Use it for legalization of v8s8 = G_ICMP v8s32.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D88191

Files:
  llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
  llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.h
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-vector-icmp.mir

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