[Bug middle-end/105905] A possible rounding error

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105905

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

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

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So clang defaults to -ffp-contract=off (maybe on which is actually the same as
off for GCC) while GCC defaults to -ffp-contract=fast. And with -march=native,
the FMA instruction is enabled which allows GCC to do contractions for some
floating point and uses FMA more.

Using -ffp-contract=off (or -ffp-contract=on) will get the behavior the
developer wants.