[PATCH] D94054: [PowerPC] Try to fold sqrt/sdiv test results with the branch.

[EsmeYi via Phabricator via llvm-commits]

Esme created this revision.
Esme added reviewers: steven.zhang, shchenz, PowerPC, masoud.ataei, nemanjai, jsji.
Herald added subscribers: kbarton, hiraditya.
Esme requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

The patch tries to fold sqrt/sdiv test node, i.g FTSQRT, XVTDIVDP, and the branch, i.e br_cc if they satisfy these patterns:

  (br_cc seteq, (and Node_test, 2), 0) -> (BCC PRED_NE, PPCNode_test)
  (br_cc seteq, (and Node_test, 4), 0) -> (BCC PRED_LE, PPCNode_test)
  (br_cc seteq, (and Node_test, 8), 0) -> (BCC PRED_GE, PPCNode_test)
  (br_cc setne, (and Node_test, 2), 0) -> (BCC PRED_EQ, PPCNode_test)
  (br_cc setne, (and Node_test, 4), 0) -> (BCC PRED_GT, PPCNode_test)
  (br_cc setne, (and Node_test, 8), 0) -> (BCC PRED_LT, PPCNode_test)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94054

Files:
  llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
  llvm/test/CodeGen/PowerPC/branch_test.ll

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