[all-commits] [llvm/llvm-project] 509893: Reapply "[AMDGPU] prevent shrinking udiv/urem if e...

[choikwa via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 509893b58ff444a6f080946bd368e9bde7668f13
      https://github.com/llvm/llvm-project/commit/509893b58ff444a6f080946bd368e9bde7668f13
  Author: choikwa <5455710+choikwa at users.noreply.github.com>
  Date:   2024-12-06 (Fri, 06 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 is in… (#118928)

… (SignedMax,UnsignedMax] (#116733)"

This reverts commit 905e831f8c8341e53e7e3adc57fd20b8e08eb999.

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.

Rebased and re-attempt after first one was reverted due to unrelated
failure in LibC (should be fixed by now I'm told).



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications