[all-commits] [llvm/llvm-project] 79b21f: [AArch64][GlobalISel] Fix bug in fewVectorElts act...

[AE via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 79b21fc187643416dbd21db10abe46a91b4c3f09
      https://github.com/llvm/llvm-project/commit/79b21fc187643416dbd21db10abe46a91b4c3f09
  Author: Amara Emerson <amara at apple.com>
  Date:   2020-09-17 (Thu, 17 Sep 2020)

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

  Log Message:
  -----------
  [AArch64][GlobalISel] Fix bug in fewVectorElts action while legalizing oversize G_FPTRUNC vectors.

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.

Differential Revision: https://reviews.llvm.org/D87814