[all-commits] [llvm/llvm-project] d1d7fc: [X86] Canonicalize (x > 1) ? x : 1 -> (x >= 1) ? x...

[topperc via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: d1d7fc98325d948bede85e6304c5ca93f79e050e
      https://github.com/llvm/llvm-project/commit/d1d7fc98325d948bede85e6304c5ca93f79e050e
  Author: Craig Topper <craig.topper at intel.com>
  Date:   2020-09-30 (Wed, 30 Sep 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/cmov.ll

  Log Message:
  -----------
  [X86] Canonicalize (x > 1) ? x : 1 -> (x >= 1) ? x : 1 for sign and unsigned to enable the use of test instructions for the compare.

This will be further canonicalized to a compare involving 0
which will enable the use of test instructions. Either using
cmovg for signed for cmovne for unsigned.

Fixes more case for PR47049