Re: [Qemu-devel] [PATCH v6 07/13] fpu: introduce hardfloat

[Emilio G. Cota]

On Wed, Dec 05, 2018 at 06:07:44 -0500, Programmingkid wrote:
> 
> > On Dec 4, 2018, at 2:10 PM, address@hidden wrote:
> > 
> > Emilio G. Cota <address@hidden> writes:
> > 
> >> On Tue, Dec 04, 2018 at 13:52:16 +0000, Alex Benn?e wrote:
> >>>> We could always
> >>>> 
> >>>> #ifdef __FAST_MATH__
> >>>> #error "Silliness like this will get you nowhere"
> >>>> #endif
> >>> 
> >>> Emilio, are you happy to add that guard with a suitable pithy comment?
> >> 
> >> Isn't it better to just disable hardfloat then?
> >> 
> >> --- a/fpu/softfloat.c
> >> +++ b/fpu/softfloat.c
> >> @@ -220,7 +220,7 @@ GEN_INPUT_FLUSH3(float64_input_flush3, float64)
> >>  * the use of hardfloat, since hardfloat relies on the inexact flag being
> >>  * already set.
> >>  */
> >> -#if defined(TARGET_PPC)
> >> +#if defined(TARGET_PPC) || defined(__FAST_MATH__)
> >> # define QEMU_NO_HARDFLOAT 1
> >> # define QEMU_SOFTFLOAT_ATTR QEMU_FLATTEN
> >> #else
> 
> Why can't PowerPC also benefit from a hardfloat? It uses IEEE754 also.  

Please see this message:
  https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg04974.html

Thanks,

                E.