[all-commits] [llvm/llvm-project] 168092: [DirectX] Legalize Freeze instruction (#136043)

[Farzon Lotfi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 168092e2ba432c0995806470790fa5aef3d7315b
      https://github.com/llvm/llvm-project/commit/168092e2ba432c0995806470790fa5aef3d7315b
  Author: Farzon Lotfi <farzonlotfi at microsoft.com>
  Date:   2025-04-17 (Thu, 17 Apr 2025)

  Changed paths:
    M llvm/lib/Target/DirectX/DXILLegalizePass.cpp
    A llvm/test/CodeGen/DirectX/legalize-freeze.ll

  Log Message:
  -----------
  [DirectX] Legalize Freeze instruction (#136043)

fixes #135719

LLVM 3.7 did not have a freeze instruction
Further this instruction is really only used as syntactic sugar
in LLVM's optimizer passes to not aggressively optimize things that
could be undef or poison ie x*2 to x+x.
Most backends treat it as a no-op so we will do the same
by removing it and replacing its uses with its input.



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