[PATCH] D87814: [AArch64][GlobalISel] Fix bug in fewVectorElts action while legalizing oversize G_FPTRUNC vectors

[Amara Emerson via Phabricator via llvm-commits]

aemerson created this revision.
aemerson added reviewers: arsenm, paquette.
aemerson added a project: LLVM.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls, rovka.
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For <8 x s32> = fptrunc <8 x s64> the fewerElementsVector action tries to break down the source vector into the final source vectors of <2 x s64> using unmerge. This fixes a crash due to using the wrong number of elements for the breakdown type.

Also add some legalizer tests for explicitly G_FPTRUNC which we didn't have.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87814

Files:
  llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
  llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-fptrunc.mir
  llvm/test/CodeGen/AArch64/arm64-vcvt.ll

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