[Bug fortran/24518] Intrinsic MOD incorrect for large arg1/arg2 and slow.

["fxcoudert at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #7 from fxcoudert at gcc dot gnu dot org  2006-10-25 08:19 -------
I'm adding Steve Kargl to the CC list, since he's our arithmetics expert :)

(In reply to comment #6)
> Revision 118024 clears the way for MOD and MODULO implementation:
> http://gcc.gnu.org/ml/gcc-cvs/2006-10/msg00703.html

Just to be sure I understand: we are garanteed that BUILT_IN_REMAINDER{F,,L}
and BUILT_IN_FMOD{F,,L} are always available, right?

> BTW: I don't know fortran requirements, but built-in functions produce faster
> code if errno is not needed. -mno-math-errno should be used in this case.

[Hum... I think you mean -fno-math-errno.]

gfortran doesn't have a need for errno to be set after math functions are
called. However, we do want that have "correct" results in all cases: Inf, NaN,
subnormals, etc. From my reading of the manual, -fno-math-errno would imply
that we do not get such correct results, am I right?


-- 

fxcoudert at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kargl at gcc dot gnu dot org
   Last reconfirmed|2006-10-22 21:01:38         |2006-10-25 08:19:20
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24518