efriedma added a comment.

> But we don't check the const attribute in CGBuiltin.cpp before converting it 
> to an intrinsic

In practice, fma() implementations don't set errno (at least, glibc and msvcrt 
don't).  And people would be really annoyed if we forced them to use fast-math 
flags to generate an fma instruction.  So this is probably okay?


https://reviews.llvm.org/D39481



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