[all-commits] [llvm/llvm-project] ff40fb: [PowerPC] Try to fold sqrt/sdiv test results with ...

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  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: ff40fb07ad6309131c2448ca00572a078c7a2d59
      https://github.com/llvm/llvm-project/commit/ff40fb07ad6309131c2448ca00572a078c7a2d59
  Author: Esme-Yi <esme.yi at ibm.com>
  Date:   2021-01-14 (Thu, 14 Jan 2021)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
    A llvm/test/CodeGen/PowerPC/fold_swtest_br.ll

  Log Message:
  -----------
  [PowerPC] Try to fold sqrt/sdiv test results with the branch.

Summary: The patch tries to fold sqrt/sdiv test node, i.g FTSQRT, XVTDIVDP, and the branch, i.e br_cc if they meet these patterns:
(br_cc seteq, (truncateToi1 SWTestOp), 0) -> (BCC PRED_NU, SWTestOp)
(br_cc seteq, (and SWTestOp, 2), 0) -> (BCC PRED_NE, SWTestOp)
(br_cc seteq, (and SWTestOp, 4), 0) -> (BCC PRED_LE, SWTestOp)
(br_cc seteq, (and SWTestOp, 8), 0) -> (BCC PRED_GE, SWTestOp)
(br_cc setne, (truncateToi1 SWTestOp), 0) -> (BCC PRED_UN, SWTestOp)
(br_cc setne, (and SWTestOp, 2), 0) -> (BCC PRED_EQ, SWTestOp)
(br_cc setne, (and SWTestOp, 4), 0) -> (BCC PRED_GT, SWTestOp)
(br_cc setne, (and SWTestOp, 8), 0) -> (BCC PRED_LT, SWTestOp)

Reviewed By: steven.zhang

Differential Revision: https://reviews.llvm.org/D94054