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Subject: [Bug middle-end/49363] [feature request] multiple target attribute (and runtime dispatching based on cpuid)
Date: Thu, 10 May 2012 20:50:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D49363

--- Comment #20 from davidxl <xinliangli at gmail dot com> 2012-05-10 20:45=
:58 UTC ---
Auto Cloning is an independent feature. What is requested here is an extens=
ion
of a previous auto clone patch by Sri (which is based on command line option
-mversion=3D...).

David


(In reply to comment #18)
> On Thu, May 10, 2012 at 3:16 AM, vincenzo.innocente at cern dot ch
> <gcc-bugzilla@gcc.gnu.org> wrote:
> > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D49363
> >
> > --- Comment #17 from vincenzo Innocente <vincenzo.innocente at cern dot=
 ch> 2012-05-10 10:16:13 UTC ---
> > I tested this
> >
> > float x[1024], y[1024], z[1024], w[1024];
> >
> > void foo() {
> > =C2=A0for (int i=3D0; i!=3D1024; ++i)
> > =C2=A0 =C2=A0 x[i]=3Dy[i]*z[i]+w[i];
> > }
> >
> >
> > void __attribute__ ((target("arch=3Dcorei7"))) foo() {
> > =C2=A0for (int i=3D0; i!=3D1024; ++i)
> > =C2=A0 =C2=A0 x[i]=3Dy[i]*z[i]+w[i];
> > }
> >
> > void __attribute__ ((target("avx"))) foo() {
> > =C2=A0for (int i=3D0; i!=3D1024; ++i)
> > =C2=A0 =C2=A0 x[i]=3Dy[i]*z[i]+w[i];
> > }
> >
> >
> > and see the three versions generated =C2=A0+ the "resolver".
> >
> > As you notice the source code is identical as I'm exploiting compiler
> > autovectorization here.
> > In this case I was hoping that a single declaration such as =C2=A0__att=
ribute__
> > ((target("arch=3Dcorei7,avx")))
> > or =C2=A0__attribute__ ((target("arch=3Dcorei7),target("avx"))) would g=
enerate the two
> > versions w/o hang to duplicate the source code.
> > Is this possible to support?
>=20
> Yes, this is on the list of things to add. The front-end should clone
> the bodies and tag the attributes appropriately.
>=20
> Thanks,
> -Sri,
>=20
>=20
> >
> > --
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