[PATCH] D144454: Add builtin for llvm set rounding

[John McCall via Phabricator via cfe-commits]

rjmccall added a comment.

Okay, so if we're adding this builtin, and it's not just imitating a stdlib function, we should definitely document it as a language extension.  There's a section in the manual about controlling FP modes which is probably an appropriate place for this.

I assume we need to document that the builtin has undefined behavior if it receives a value outside of the standard-defined set.  (We can't guarantee that it's a no-op or else we'll never be able to extend the standard-defined set.)


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D144454/new/

https://reviews.llvm.org/D144454