[PATCH] D62408: [X86] Avoid SFB - Fix inconsistent codegen with/without debug info(2)

[Chris Dawson via Phabricator via llvm-commits]

cdawson created this revision.
cdawson added reviewers: craig.topper, lsaba, RKSimon, probinson, aprantl.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

The function `findPotentialBlockers` may consider debug info instructions as potential blockers
and may stop searching for a store-load pair prematurely.

This patch corrects this and tests the cases where the store is separated from the 
load by more than `InspectionLimit` debug instructions.

See D61680 <https://reviews.llvm.org/D61680> for a previous simmilar fix in this area.


https://reviews.llvm.org/D62408

Files:
  llvm/lib/Target/X86/X86AvoidStoreForwardingBlocks.cpp
  llvm/test/CodeGen/X86/avoid-sfb-g-no-change2.mir
  llvm/test/CodeGen/X86/avoid-sfb-g-no-change3.mir

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