[all-commits] [llvm/llvm-project] 5e5af5: [IR] Fix mayReadFromMemory() for writeonly calls

[llvm-git-migration via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 5e5af533ab16bad6dc5519b97b1820732d0141a5
      https://github.com/llvm/llvm-project/commit/5e5af533ab16bad6dc5519b97b1820732d0141a5
  Author: Yevgeny Rouban <yevgeny.rouban at azul.com>
  Date:   2019-10-21 (Mon, 21 Oct 2019)

  Changed paths:
    M llvm/lib/IR/Instruction.cpp
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.ds.gws.init.ll
    A llvm/test/Transforms/EarlyCSE/writeonly.ll

  Log Message:
  -----------
  [IR] Fix mayReadFromMemory() for writeonly calls

Current implementation of Instruction::mayReadFromMemory()
returns !doesNotAccessMemory() which is !ReadNone. This
does not take into account that the writeonly attribute
also indicates that the call does not read from memory.

The patch changes the predicate to !doesNotReadMemory()
that reflects the intended behavior.

Differential Revision: https://reviews.llvm.org/D69086

llvm-svn: 375389