[Bug middle-end/123826] folding of `pow(a, 2.0)` into a*a causes errno not to be set

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123826

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The `pow (a, 2.0)` folding seems to have been done here:
https://inbox.sourceware.org/gcc-patches/pine.lnx.4.44.0401311909470.32161-100...@www.eyesopen.com/