[PATCH] D87108: [ImplicitNullCheck] Handle instructions that do not modify null behaviour of null checked reg

[Anna Thomas via Phabricator via llvm-commits]

anna created this revision.
anna added reviewers: dantrushin, reames, skatkov.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.
anna requested review of this revision.

This is the first in a series of patches to make implicit null checks
more general. This patch identifies instructions that do not change
nullness of a register and considers that as a valid instruction to
hoist along with the faulting load. See added testcases.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87108

Files:
  llvm/include/llvm/CodeGen/TargetInstrInfo.h
  llvm/lib/CodeGen/ImplicitNullChecks.cpp
  llvm/lib/Target/X86/X86InstrInfo.cpp
  llvm/lib/Target/X86/X86InstrInfo.h
  llvm/test/CodeGen/X86/implicit-null-check.ll

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