[PATCH] D21493: [ValueTracking] Teach computeKnownBits for PHI nodes to compute sign bit for a recurrence with a NSW addition.

[Craig Topper via llvm-commits]

craig.topper updated this revision to Diff 61758.

http://reviews.llvm.org/D21493

Files:
  lib/Analysis/ValueTracking.cpp
  test/Transforms/BBVectorize/loop1.ll
  test/Transforms/InstCombine/phi.ll

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