[PATCH] D89855: [PowerPC] Extend folding RLWINM + RLWINM to post-RA.

[EsmeYi via Phabricator via llvm-commits]

Esme updated this revision to Diff 304410.
Esme added a comment.

In post-RA, if SrcMI also defines the register to be forwarded, we can only do the folding if SrcMI is going to be erased.
For example, SrcMI and MI can't not be folded in the scenario:

  $r3 = RLWINM_rec $r3, 27, 5, 10, implicit-def $cr0
  dead renamable $r3 = RLWINM_rec killed renamable $r3, 8, 5, 10, implicit-def $cr0
  BLR8 implicit $lr8, implicit $rm, implicit killed $cr0

I've run the bootstrap-test as well as SEPC.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D89855/new/

https://reviews.llvm.org/D89855

Files:
  llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
  llvm/lib/Target/PowerPC/PPCInstrInfo.h
  llvm/lib/Target/PowerPC/PPCMIPeephole.cpp
  llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp
  llvm/test/CodeGen/PowerPC/fold-rlwinm-after-ra.mir
  llvm/test/CodeGen/PowerPC/vsx_builtins.ll

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