[Bug c++/98207] ARM64 IEEE math results change with -O2

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98207

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The default is to use fused multiple add.
If you don't want to use FMA, then use -ffp-contract=off (the default =fast).


x84_64 by default does not have a fused-multiple-add instruction without extra
options (to enable the ISA for fused multiple add instruction).