[PATCH] D70374: [PowerPC] combine rlwinm + rlwinm to rlwinm

[ChenZheng via Phabricator via llvm-commits]

shchenz created this revision.
shchenz added reviewers: nemanjai, jsji, qshanz, hfinkel, PowerPC.
Herald added subscribers: llvm-commits, wuzish, hiraditya.
Herald added a project: LLVM.

This patch is to support combining of rlwinm + rlwinm to one rlwinm.
For example:

  x3 = rlwinm x3, 27, 5, 31
  x3 = rlwinm x3, 19, 0, 12

can be combined to

  x3 = rlwinm x3, 14, 0, 12


https://reviews.llvm.org/D70374

Files:
  llvm/lib/Target/PowerPC/PPCMIPeephole.cpp
  llvm/test/CodeGen/PowerPC/fold-rlwinm.mir

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