[PATCH] D25970: DCE math library calls with a constant operand

[Eli Friedman via llvm-commits]

efriedma created this revision.
efriedma added reviewers: scanon, majnemer.
efriedma added subscribers: llvm-commits, davidxl, xur, hfinkel.
efriedma set the repository for this revision to rL LLVM.

On platforms which use -fmath-errno, math libcalls without any uses require some extra checks to figure out if they are actually dead.

Fixes https://llvm.org/bugs/show_bug.cgi?id=30464 .


Repository:
  rL LLVM

https://reviews.llvm.org/D25970

Files:
  include/llvm/Analysis/ConstantFolding.h
  lib/Analysis/ConstantFolding.cpp
  lib/Transforms/Utils/Local.cpp
  test/Transforms/DCE/calls-errno.ll

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