[all-commits] [llvm/llvm-project] 28de01: [Statepoint] Treat undef operands less specially

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/stackmap-undef
  Home:   https://github.com/llvm/llvm-project
  Commit: 28de01787331dc5f4c1e39c239efdd07ffc5d324
      https://github.com/llvm/llvm-project/commit/28de01787331dc5f4c1e39c239efdd07ffc5d324
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2024-12-16 (Mon, 16 Dec 2024)

  Changed paths:
    M llvm/lib/CodeGen/FixupStatepointCallerSaved.cpp
    M llvm/lib/CodeGen/StackMaps.cpp
    A llvm/test/CodeGen/X86/stackmap-undef-operand-anyregcc.mir
    M llvm/test/CodeGen/X86/statepoint-fixup-undef.mir

  Log Message:
  -----------
  [Statepoint] Treat undef operands less specially

This reverts commit f7443905af1e06eaacda1e437fff8d54dc89c487.

This is to avoid an assertion if an undef operand appears in a
stackmap. This is important to avoid hitting verifier errors
when register allocation starts adding undefs in error scenarios.

Rather than trying to treat undef operands as special, leave them
alone and avoid producing an invalid spill. It would a bit more
precise to produce a spill of an undef register here, but that's not
exposed through the storeRegToStackSlot API.

https://reviews.llvm.org/D122605

This was an alternative to https://reviews.llvm.org/D122582



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