[all-commits] [llvm/llvm-project] 7f7f24: [AArch64PostCoalescer] Propagate undef flag after ...

[XiaShark via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7f7f24944ad854139981051d1138940195a1cd73
      https://github.com/llvm/llvm-project/commit/7f7f24944ad854139981051d1138940195a1cd73
  Author: XiaShark <xiajingze1 at huawei.com>
  Date:   2025-10-15 (Wed, 15 Oct 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64MachineFunctionInfo.cpp
    M llvm/lib/Target/AArch64/AArch64MachineFunctionInfo.h
    M llvm/lib/Target/AArch64/AArch64PostCoalescerPass.cpp
    A llvm/test/CodeGen/AArch64/aarch64-post-coalescer.mir
    A llvm/test/CodeGen/AArch64/mir-yaml-has-streaming-mode-changes.ll

  Log Message:
  -----------
  [AArch64PostCoalescer] Propagate undef flag after replacing (#163119)

I encountered a compilation crash issue, and after analysis, it was
caused by the AArch64PostCoalescerPass, see https://godbolt.org/z/vPeqeo5Pa.
When replacing the register, if the source register has undef flag, we
should propagate the flag to all uses of the destination register.



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