[PATCH] D134697: [X86] Consider branch probability in avoiding Store Forward Block

[wqf via Phabricator via llvm-commits]

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Packed memory accesses may be broken because of predecessors, no matter how low the branch probabilities are.

This patch tries to fix two unprofitable cases:

a) Potential blockers from low-branch-probability predecessor.

b) Potential blockers from the block itself (a short self loop), memory address may change in each iteration.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134697

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

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