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

Dmitry Venikov via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Tue Dec 19 05:34:48 PST 2017

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.



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