[all-commits] [llvm/llvm-project] ec32df: [BranchFolding] skip debug instr to avoid code change

[Jeremy Morse via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: ec32dff0b075055b30140c543e9f2bef608adc14
      https://github.com/llvm/llvm-project/commit/ec32dff0b075055b30140c543e9f2bef608adc14
  Author: Jeremy Morse <jeremy.morse at sony.com>
  Date:   2019-10-29 (Tue, 29 Oct 2019)

  Changed paths:
    M llvm/lib/CodeGen/BranchFolding.cpp
    A llvm/test/CodeGen/MIR/X86/branch-folder-with-debug.mir

  Log Message:
  -----------
  [BranchFolding] skip debug instr to avoid code change

Use the existing helper function in BranchFolding, "countsAsInstruction",
to skip over non-instructions. Otherwise debug instructions can be
identified as the last real instruction in a block, leading to different
codegen decisions when debug is enabled as demonstrated by the test case.

Patch by: yechunliang (Chris Ye)!

Differential Revision: https://reviews.llvm.org/D66467