[all-commits] [llvm/llvm-project] bd1f7c: AMDGPU: Try to push fneg as integer into select

Matt Arsenault via All-commits all-commits at lists.llvm.org
Sun Mar 5 14:53:30 PST 2023


  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bd1f7c417fc04f93de6b7bbf8740351e58a90613
      https://github.com/llvm/llvm-project/commit/bd1f7c417fc04f93de6b7bbf8740351e58a90613
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2023-03-05 (Sun, 05 Mar 2023)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/test/CodeGen/AMDGPU/fneg-modifier-casting.ll

  Log Message:
  -----------
  AMDGPU: Try to push fneg as integer into select

I initially attempted to select the source modifier from xor of
a sign mask. This proved to be more difficult since
foldBinOpIntoSelect does not consider free fneg of integers
and undoes the combine.




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