[all-commits] [llvm/llvm-project] 1b1297: [AArch64][AMDGPU][GlobalISel] Remove vector handli...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1b12974ccba6478b27d7ba13ceead2864ab4be20
      https://github.com/llvm/llvm-project/commit/1b12974ccba6478b27d7ba13ceead2864ab4be20
  Author: David Green <david.green at arm.com>
  Date:   2024-02-20 (Tue, 20 Feb 2024)

  Changed paths:
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/combine-unmerge.mir
    M llvm/test/CodeGen/AArch64/aarch64-bif-gen.ll
    M llvm/test/CodeGen/AArch64/aarch64-bit-gen.ll
    M llvm/test/CodeGen/AArch64/abs.ll
    M llvm/test/CodeGen/AArch64/arm64-neon-copy.ll
    M llvm/test/CodeGen/AArch64/arm64-vcvt_f.ll
    M llvm/test/CodeGen/AArch64/bswap.ll
    M llvm/test/CodeGen/AArch64/fpext.ll
    M llvm/test/CodeGen/AArch64/fptoi.ll
    M llvm/test/CodeGen/AArch64/llvm.exp10.ll
    M llvm/test/CodeGen/AArch64/reduce-and.ll
    M llvm/test/CodeGen/AArch64/reduce-or.ll
    M llvm/test/CodeGen/AArch64/reduce-xor.ll
    M llvm/test/CodeGen/AArch64/shift.ll
    M llvm/test/CodeGen/AArch64/vecreduce-fmax-legalization-nan.ll
    M llvm/test/CodeGen/AArch64/vecreduce-fmax-legalization.ll
    M llvm/test/CodeGen/AArch64/vecreduce-fmaximum.ll
    M llvm/test/CodeGen/AArch64/vecreduce-fmin-legalization.ll
    M llvm/test/CodeGen/AArch64/vecreduce-fminimum.ll
    M llvm/test/CodeGen/AArch64/vecreduce-umax-legalization.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fma-add-mul-post-legalize.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fma-add-mul-pre-legalize.mir

  Log Message:
  -----------
  [AArch64][AMDGPU][GlobalISel] Remove vector handling from unmerge_dead_to_trunc (#82224)

This combine transforms an unmerge where only the first element is used
into a truncate. That works OK for scalar but for vector needs to insert
a bitcast to integers, perform the truncate then bitcast back to
vectors. This generates more awkward code than using an Unmerge.



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