[Bug target/110564] Incorrect results from floating point computations on x86 when optimized

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110564

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>undefined or unspecified behavior

Neither. Basically GCC uses excess-precision for the fpu as supplied by x87
(80bit IEEE FPU).  Anyways read bug 323 and all of the specifications around FP
math and more.