[Bug middle-end/101063] #pragma STDC FENV_ACCESS ON: wrong code generation: instructions leading to side effects may not be generated

[glisse at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101063

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
> Note 1: Under -Wall gcc generates warning:
> <source>:5: warning: ignoring '#pragma STDC FENV_ACCESS' [-Wunknown-pragmas]

That seems like a huge hint, this is not implemented in gcc. You can find
several existing PR in this bugzilla.

There is a branch refs/users/glisse/heads/fenv that was kind of functional last
time I tried, but I'll never have time to polish it.