yaxunl added a comment.

In D90174#2371577 <https://reviews.llvm.org/D90174#2371577>, @rjmccall wrote:

> Hmm.  Do we actually want this behavior of `fast` overriding pragmas?  What 
> do other compilers do here?  It might be reasonable to just treat this as a 
> bug.

I think clang is just trying to follow gcc's behavior. However, this is 
undesirable in certain cases. Introducing 'faststd' gives us more choices to 
avoid the undesirable behavior.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D90174/new/

https://reviews.llvm.org/D90174

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