[all-commits] [llvm/llvm-project] 5abdce: [LLVM][AArch64InstrInfo] Prevent fill folding when...

[Paul Walker via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5abdce4083ed37203e4893f8f7ef3890586b008a
      https://github.com/llvm/llvm-project/commit/5abdce4083ed37203e4893f8f7ef3890586b008a
  Author: Paul Walker <paul.walker at arm.com>
  Date:   2025-07-16 (Wed, 16 Jul 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
    M llvm/test/CodeGen/AArch64/spill-fold.mir

  Log Message:
  -----------
  [LLVM][AArch64InstrInfo] Prevent fill folding when DstReg is SP. (#148885)

We can remove subreg COPY instructions by filling directly into the
COPY's destination register. However, this is only valid when the copy
and fill have compatible register classes.

Fixes https://github.com/llvm/llvm-project/issues/148659



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