[PATCH] D156434: [PEI][ARM] Switch to backwards frame index elimination

[Jay Foad via Phabricator via llvm-commits]

foad created this revision.
foad added reviewers: t.p.northover, rengolin, greened, olista01, sdesmalen, arsenm, sepavloff, luporl.
Herald added subscribers: StephenFan, arphaman, hiraditya, kristof.beyls, qcolombet.
Herald added a project: All.
foad requested review of this revision.
Herald added subscribers: llvm-commits, wdng.
Herald added a project: LLVM.

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.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D156434

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

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