[PATCH] D13255: [LAA] LLE 2/6: Fix a NoDep case that should be a Forward dependence

[Adam Nemet via llvm-commits]

anemet created this revision.
anemet added a reviewer: hfinkel.
anemet added a subscriber: llvm-commits.

When the dependence distance in zero then we have a loop-independent
dependence from the earlier to the later access.

No current client of LAA uses forward dependences so other than
potentially hitting the MaxDependences threshold earlier, this change
shouldn't affect anything right now.

This and the previous patch were tested together for compile-time
regression.  None found in LNT/SPEC.

http://reviews.llvm.org/D13255

Files:
  include/llvm/Analysis/LoopAccessAnalysis.h
  lib/Analysis/LoopAccessAnalysis.cpp
  test/Analysis/LoopAccessAnalysis/forward-loop-independent.ll

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