[all-commits] [llvm/llvm-project] 0935e1: Return nullopt if Reg is undef. (#155893)

[Shubham Sandeep Rastogi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0935e1510da9435c6a7c43fd383caf8b91971d4b
      https://github.com/llvm/llvm-project/commit/0935e1510da9435c6a7c43fd383caf8b91971d4b
  Author: Shubham Sandeep Rastogi <srastogi22 at apple.com>
  Date:   2025-10-16 (Thu, 16 Oct 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
    A llvm/test/DebugInfo/AArch64/callsite.mir

  Log Message:
  -----------
  Return nullopt if Reg is undef. (#155893)

In describeORRLoadedValue in AArch64InstrInfo.cpp, we try to check if an
instruction is a copy like instruction, the isCopyLikeInstr function
returns a pair of destination and source registers. If any of them are
undef, we should just return a nullopt to avoid any crashes later in the
code when trying to get the SubReg for one of those registers.

rdar://158581204



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