[all-commits] [llvm/llvm-project] 945123: [PEI][ARM] Switch to backwards frame index elimina...

[Jay Foad via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 945123384e2e6c1f4ee27c785399b585c7225c83
      https://github.com/llvm/llvm-project/commit/945123384e2e6c1f4ee27c785399b585c7225c83
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2023-07-28 (Fri, 28 Jul 2023)

  Changed paths:
    M llvm/lib/CodeGen/PrologEpilogInserter.cpp
    M llvm/lib/Target/ARM/ARMBaseRegisterInfo.h
    M llvm/test/CodeGen/Thumb/emergency-spill-slot.ll

  Log Message:
  -----------
  [PEI][ARM] Switch to backwards frame index elimination

This adds better support for call frame pseudos that adjust SP in
PEI::replaceFrameIndicesBackward.

Running frame index elimination backwards is preferred because it can
do backwards register scavenging (on targets that require scavenging)
which does not rely on accurate kill flags.

Differential Revision: https://reviews.llvm.org/D156434