[all-commits] [llvm/llvm-project] dcc5ff: [PowerPC] Use PredictableSelectIsExpensive to enab...

[Zhang Kang via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: dcc5ff3bc2e85a07ff2192223c652fa2cdb164ef
      https://github.com/llvm/llvm-project/commit/dcc5ff3bc2e85a07ff2192223c652fa2cdb164ef
  Author: Kang Zhang <shkzhang at cn.ibm.com>
  Date:   2020-05-11 (Mon, 11 May 2020)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPC.td
    M llvm/lib/Target/PowerPC/PPCISelLowering.cpp
    M llvm/lib/Target/PowerPC/PPCSubtarget.cpp
    M llvm/lib/Target/PowerPC/PPCSubtarget.h
    A llvm/test/CodeGen/PowerPC/select-to-branch.mir

  Log Message:
  -----------
  [PowerPC] Use PredictableSelectIsExpensive to enable select to branch in CGP

Summary:
This patch will set the variable PredictableSelectIsExpensive to do the
select to if based on BranchProbability in CodeGenPrepare.

When the BranchProbability more than MinPercentageForPredictableBranch,
PPC will convert SELECT to branch.

Reviewed By: nemanjai

Differential Revision: https://reviews.llvm.org/D71883