Re: [Qemu-devel] [PATCH v1 04/14] fp-test: add muladd variants

["Emilio G. Cota" <cota@braap.org>]

On Tue, Mar 27, 2018 at 12:33:55 +0100, Alex Bennée wrote:
> Emilio G. Cota <cota@braap.org> writes:
> 
> > These are a few muladd-related operations that the original IBM syntax
> > does not specify; model files for these are in muladd.fptest.
> >
> > Signed-off-by: Emilio G. Cota <cota@braap.org>
(snip)
> > +        case OP_MULADD_NEG_ADDEND:
> > +            res64 = float64_muladd(a, b, c, float_muladd_negate_c, s);
> > +            break;
> > +        case OP_MULADD_NEG_PRODUCT:
> > +            res64 = float64_muladd(a, b, c, float_muladd_negate_product, s);
> > +            break;
> > +        case OP_MULADD_NEG_RESULT:
> > +            res64 = float64_muladd(a, b, c, float_muladd_negate_result, s);
> > +            break;
> >          case OP_DIV:
> >              res64 = float64_div(a, b, s);
> >              break;
> 
> Are there any intrinsics we could use for the hard variant which would
> be useful if we want to run under translation?

I don't know of any portable way of doing this. We could add some
arch-specific code though, suitably ifdef'ed.

		E.