[all-commits] [llvm/llvm-project] b8e1d4: [AMDGPU] prevent shrinking udiv/urem if either ope...

[choikwa via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b8e1d4dbea8905e48d51a70bf75cb8fababa4a60
      https://github.com/llvm/llvm-project/commit/b8e1d4dbea8905e48d51a70bf75cb8fababa4a60
  Author: choikwa <5455710+choikwa at users.noreply.github.com>
  Date:   2024-11-20 (Wed, 20 Nov 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp
    M llvm/test/CodeGen/AMDGPU/amdgpu-codegenprepare-idiv.ll
    M llvm/test/CodeGen/AMDGPU/bypass-div.ll
    M llvm/test/CodeGen/AMDGPU/udiv64.ll
    M llvm/test/CodeGen/AMDGPU/urem64.ll

  Log Message:
  -----------
  [AMDGPU] prevent shrinking udiv/urem if either operand is in (SignedMax,UnsignedMax] (#116733)

Do this by using ComputeKnownBits and checking for !isNonNegative and
isUnsigned. This rejects shrinking unsigned div/rem if operands exceed
smax_bitwidth since we know NumSignBits will be always 0.



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