[PATCH] D144454: Add builtin for llvm set rounding

[John McCall via Phabricator via cfe-commits]

rjmccall added a comment.

`__builtin_set_flt_rounds` seems better.

We should add the portability checking, yeah.  Look at the checking we do for certain builtins with `CheckBuiltinTargetInSupported` in `SemaChecking.cpp`.


Repository:
  rG LLVM Github Monorepo

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

https://reviews.llvm.org/D144454