[MPlayer-dev-eng] [PATCH] configure: use -march=native when available

[Zuxy Meng]

Hi,

2007/8/25, Diego Biurrun <diego at biurrun.de>:
> On Thu, Aug 16, 2007 at 04:04:48PM +0800, Zuxy Meng wrote:
> >
> > gcc 4.2 supports 'native' as an option to 'march' and 'mtune'. And gcc
> > will translate it into the most appropriate march and mtune options
> > for the host machine. It's similar to what mplayer's configure's
> > doing, but refrains us from making the script longer and longer as new
> > CPUs appears in market. What's more, it provides support for CPUs not
> > yet covered by existing -march options (for example, it'll choose
> > -march=prescott -mtune=generic for Yonah).
> >
> > --- configure ?????? 24074??
> > +++ configure ????????????
> > @@ -1700,6 +1700,7 @@
> >       else
> >               proc=pentium4
> >       fi
> > +     test $_fast_cmov = "auto" && _fast_cmov=no
> >       ;;
> >      *) proc=prescott iproc=686 ;;
> >      esac
> > @@ -1843,10 +1845,6 @@
> >
> >      if test $_cmov = "yes" && test $_fast_cmov = "auto" ; then
> >          _fast_cmov="yes"
> > -        case "$proc" in
> > -            pentium4|prescott|nocona)
> > -                _fast_cmov="no"
> > -        esac
> >      else
> >          _fast_cmov="no"
> >      fi
> > @@ -1887,7 +1885,9 @@
> >          *)
> >            # 64-bit prescotts exist, but as far as GCC is concerned they
> >            # have the same capabilities as a nocona.
> > -          proc=nocona;;
> > +          proc=nocona
> > +          test $_fast_cmov = "auto" && _fast_cmov=no
> > +          ;;
> >          esac
> >          ;;
> >        *)
>
> This looks like something else entirely.

I have to move the _fast_cmov detection code elsewhere or proc=native
will break it.

-- 
Zuxy
Beauty is truth,
While truth is beauty.
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