[PATCH] D18685: [IndVars] Eliminate op.with.overflow when possible

[Sanjoy Das via llvm-commits]

sanjoy created this revision.
sanjoy added reviewers: atrick, regehr.
sanjoy added a subscriber: llvm-commits.
Herald added subscribers: mcrosier, sanjoy.

If we can prove that an op.with.overflow intrinsic does not overflow, we
can get rid of the intrinsic, and replace it with non-wrapping
arithmetic.

http://reviews.llvm.org/D18685

Files:
  lib/Transforms/Utils/SimplifyIndVar.cpp
  test/Transforms/IndVarSimplify/overflow-intrinsics.ll
  test/Transforms/IndVarSimplify/overflowcheck.ll

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