[PATCH] D63972: [PowerPC] Do the Early Return for the li and unconditional branch

[Zhang Kang via Phabricator via llvm-commits]

ZhangKang created this revision.
ZhangKang added reviewers: nemanjai, echristo, steven.zhang, hfinkel, jsji, hiraditya, efriedma.
Herald added a project: LLVM.

This patch will do early return for  li and unconditional branch, below is an example:

  // # %bb.0:                     | # %bb.0:
  //     ...                      |     ...
  //                              |     li 3, 100
  //     b      ReturnMBB         |     blr
  // # %bb.1:              ====>  | # %bb.1:
  //     ...                      |     ...
  // ReturnMBB:                   | ReturnMBB:
  //     li 3, 100                |     li 3, 100
  //     blr                      |     blr


https://reviews.llvm.org/D63972

Files:
  llvm/lib/Target/PowerPC/PPCEarlyReturn.cpp
  llvm/test/CodeGen/PowerPC/early-ret.mir

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