[PATCH] D11866: transform fmin/fmax calls when possible (PR24314)

[Sanjay Patel via llvm-commits]

spatel created this revision.
spatel added reviewers: hfinkel, arsenm, jmolloy.
spatel added a subscriber: llvm-commits.

If we can ignore NaNs, fmin/fmax libcalls can become compare and select (this is what we turn std::min / std::max into). 

This IR should then be optimized in the backend to whatever is best for any given target. Eg, x86 can use minss/maxss instructions.

This should solve PR24314:
https://llvm.org/bugs/show_bug.cgi?id=24314 

http://reviews.llvm.org/D11866

Files:
  include/llvm/Transforms/Utils/SimplifyLibCalls.h
  lib/Transforms/Utils/SimplifyLibCalls.cpp
  test/Transforms/InstCombine/fast-math.ll

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