[all-commits] [llvm/llvm-project] ceb744: [AMDGPU] Fix canonicalization of truncated values....

[Harald van Dijk via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ceb744eb2fa0895db1526110462745962fdf43c0
      https://github.com/llvm/llvm-project/commit/ceb744eb2fa0895db1526110462745962fdf43c0
  Author: Harald van Dijk <harald at gigawatt.nl>
  Date:   2024-03-13 (Wed, 13 Mar 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUInstructions.td
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/lib/Target/AMDGPU/SIISelLowering.h
    M llvm/lib/Target/AMDGPU/SIInstructions.td
    M llvm/test/CodeGen/AMDGPU/bf16.ll
    M llvm/test/CodeGen/AMDGPU/clamp.ll
    M llvm/test/CodeGen/AMDGPU/fcanonicalize-elimination.ll
    M llvm/test/CodeGen/AMDGPU/fcanonicalize.f16.ll
    M llvm/test/CodeGen/AMDGPU/fcanonicalize.ll
    M llvm/test/CodeGen/AMDGPU/fneg-combines.f16.ll
    M llvm/test/CodeGen/AMDGPU/fneg-combines.new.ll
    M llvm/test/CodeGen/AMDGPU/llvm.maxnum.f16.ll
    M llvm/test/CodeGen/AMDGPU/llvm.minnum.f16.ll
    M llvm/test/CodeGen/AMDGPU/mad-mix-lo.ll

  Log Message:
  -----------
  [AMDGPU] Fix canonicalization of truncated values. (#83054)

We were relying on roundings to implicitly canonicalize, which is
generally safe, except with roundings that may be optimized away.

Fixes #82937.



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