[PATCH] D23470: [memcpyopt] Memcpy-memcpy dependence isn't detected across basic blocks

[Patrick Walton via llvm-commits]

pcwalton created this revision.
pcwalton added reviewers: dberlin, majnemer, hfinkel.
pcwalton added a subscriber: llvm-commits.

Make the memory dependence queries in the memcpy optimizer nonlocal.

This eliminates 28% of the llvm.memcpy calls in librustc.

Fixes PR28958.

https://reviews.llvm.org/D23470

Files:
  include/llvm/Analysis/MemoryDependenceAnalysis.h
  lib/Analysis/MemDepPrinter.cpp
  lib/Analysis/MemoryDependenceAnalysis.cpp
  lib/Transforms/Scalar/GVN.cpp
  lib/Transforms/Scalar/MemCpyOptimizer.cpp
  test/Transforms/MemCpyOpt/nonlocal-memcpy-memcpy.ll

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