[PATCH] D41940: [InstCombine] Missed optimization in math expression: log10(pow(10.0, x)) == x, log2(pow(2.0, x)) == x

[Dmitry Venikov via Phabricator via llvm-commits]

Quolyk created this revision.
Quolyk added reviewers: hfinkel, spatel, efriedma.

This patch enables folding following instructions under -ffast-math flag: log10(pow(10.0,x)) -> x, log2(pow(2.0,x)) -> x


https://reviews.llvm.org/D41940

Files:
  lib/Analysis/InstructionSimplify.cpp
  test/Transforms/InstSimplify/log10-intrinsic.ll
  test/Transforms/InstSimplify/log2-intrinsic.ll

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