[all-commits] [llvm/llvm-project] 463e93: Reapply [AMDGPU] prevent shrinking udiv/urem if e...

[choikwa via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 463e93b95f0887145b51edb81b770eeb4463abc5
      https://github.com/llvm/llvm-project/commit/463e93b95f0887145b51edb81b770eeb4463abc5
  Author: choikwa <5455710+choikwa at users.noreply.github.com>
  Date:   2024-12-12 (Thu, 12 Dec 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:
  -----------
   Reapply [AMDGPU] prevent shrinking udiv/urem if either operand exceeds signed max (#119325)

This reverts commit 254d206ee2a337cb38ba347c896f7c6a14c7f218.

+Added a fix in ExpandDivRem24 to disqualify if DivNumBits exceed 24.

Original commit & msg:
ce6e955ac374f2b86cbbb73b2f32174dffd85f25.
Handle signed and unsigned path differently in getDivNumBits. Using
computeKnownBits, this rejects shrinking unsigned div/rem if operands
exceed signed max since we know NumSignBits will be always 0.



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