[PATCH] optimize away fabs calls when input is known positive

[Sanjay Patel]

Closed by commit rL219717 (authored by @spatel).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5777

Files:
  llvm/trunk/include/llvm/Transforms/Utils/SimplifyLibCalls.h
  llvm/trunk/lib/Transforms/Utils/SimplifyLibCalls.cpp
  llvm/trunk/test/Transforms/InstCombine/fabs.ll
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