[PATCH] D41389: [WIP][InstCombine] Missed optimization in math expression: squashing sin(asin), cos(acos)

[Dmitry Venikov via Phabricator via llvm-commits]

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

Motivation: https://bugs.llvm.org/show_bug.cgi?id=35603. I have failing test on functions cos_acos_fast and sin_asin_fast. Specifically

  %call = call fast double @acos(double %a)
  %call = call fast double @asin(double %a)

are not erased after transform, however %call instruction is never used. I'm looking for help, as I do not know why it behaves this way.


https://reviews.llvm.org/D41389

Files:
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/Transforms/InstCombine/cos-intrinsic.ll
  test/Transforms/InstCombine/sin-intrinsic.ll

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