[Bug target/59385] [4.9 regression] gcc 4.9 fails to use fma with __attribute__((target("fma")))

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59385

Richard Biener <rguenth at gcc dot gnu.org> changed:

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

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Julian Taylor from comment #6)
> shouldn't -ffast-math enable -ffp-contract=fast?

it doesn't (it probably should)

> also gcc 4.9 still documents -ffp-contract=fast as being the default while
> it is apparently not anymore.

it's the default unless you override it with -std=c99 (always use -std=gnu99).

Are you sure this worked correctly in 4.8.0?  I see both functions using
vfmadd132sd there - that's cleary wrong as well.

Works for me correctly, with -std=gnu99.

Thus, it works as intended in 4.9 and the bug in 4.8 was fixed.