[all-commits] [llvm/llvm-project] 4a646c: [Instruction] Add updateLocationAfterHoist helper

[Vedant Kumar via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 4a646ca9e2caf70d6312714770f516fb83b7e3cb
      https://github.com/llvm/llvm-project/commit/4a646ca9e2caf70d6312714770f516fb83b7e3cb
  Author: Vedant Kumar <vsk at apple.com>
  Date:   2020-08-11 (Tue, 11 Aug 2020)

  Changed paths:
    M llvm/include/llvm/IR/Instruction.h
    M llvm/lib/IR/DebugInfo.cpp
    M llvm/lib/Transforms/Scalar/GVN.cpp
    M llvm/lib/Transforms/Scalar/LICM.cpp
    M llvm/test/DebugInfo/Generic/licm-hoist-debug-loc.ll
    M llvm/test/Transforms/GVN/PRE/phi-translate.ll
    M llvm/test/Transforms/LICM/hoisting-preheader-debugloc.ll
    M llvm/unittests/IR/InstructionsTest.cpp

  Log Message:
  -----------
  [Instruction] Add updateLocationAfterHoist helper

Introduce a helper on Instruction which can be used to update the debug
location after hoisting.

Use this in GVN and LICM, where we were mistakenly introducing new line
0 locations after hoisting (the docs recommend dropping the location in
this case).

For more context, see the discussion in https://reviews.llvm.org/D60913.

Differential Revision: https://reviews.llvm.org/D85670