[PATCH] D87528: Enable '#pragma STDC FENV_ACCESS' in frontend cf. D69272 - Work in Progress

[John McCall via Phabricator via cfe-commits]

rjmccall added a comment.

The GCC docs seem pretty clear that `-frounding-math` is meant to allow dynamic access to the FP environment.  There might be optimizations that are perfectly legal with a constant but non-default rounding mode, and there might be some flag that only implies that weaker constraint, but `-frounding-math` needs to turn `FENV_ACCESS` on by default.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D87528/new/

https://reviews.llvm.org/D87528