[all-commits] [llvm/llvm-project] 9a7843: [AArch64][GlobalISel] Legalize small G_TRUNC (#85625)

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9a784303a3666e9d9b93088a1519e1dc2ba4d015
      https://github.com/llvm/llvm-project/commit/9a784303a3666e9d9b93088a1519e1dc2ba4d015
  Author: David Green <david.green at arm.com>
  Date:   2024-03-18 (Mon, 18 Mar 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h
    M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-load-store.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-xtn.mir
    M llvm/test/CodeGen/AArch64/bitcast.ll
    M llvm/test/CodeGen/AArch64/itofp.ll

  Log Message:
  -----------
  [AArch64][GlobalISel] Legalize small G_TRUNC (#85625)

This is an alternative to #85610, that moreElement's small G_TRUNC
vectors to widen the vectors. It needs to disable one of the existing
Unmerge(Trunc(..)) combines, and some of the code is not as optimal as
it could be. I believe with some extra optimizations it could look
better (I was thinking combining trunc(buildvector) -> buildvector and
possibly improving buildvector lowering by generating
insert_vector_element earlier).



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