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Date:      Sun, 23 Mar 2003 18:02:45 +0100
From:      Till Riedel <till@f111.hadiko.de>
To:        Anti <fearow@attbi.com>
Cc:        David Schultz <das@FreeBSD.org>, sgk@troutmask.apl.washington.edu, freebsd-current@FreeBSD.org
Subject:   Re: libm problem
Message-ID:  <20030323170244.GA1911@f111.hadiko.de>
In-Reply-To: <20030323070808.0d3f63c0.fearow@attbi.com>
References:  <20030318173051.GA2322@f111.hadiko.de> <20030319131317.GA670@HAL9000.homeunix.com> <20030321235237.GA8097@f111.hadiko.de> <20030322111233.F4471@gamplex.bde.org> <20030322005435.GA8393@f111.hadiko.de> <20030322051443.GA13854@HAL9000.homeunix.com> <20030322182846.GA81615@troutmask.apl.washington.edu> <20030322123951.67271b29.fearow@attbi.com> <20030323074114.GA80906@HAL9000.homeunix.com> <20030323070808.0d3f63c0.fearow@attbi.com>

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On Sun, Mar 23, 2003 at 07:08:08AM -0600, Anti wrote:
> On Sat, 22 Mar 2003 23:41:14 -0800
> David Schultz <das@FreeBSD.org> wrote:
> 
> > Thus spake Anti <fearow@attbi.com>:
> > > On Sat, 22 Mar 2003 10:28:46 -0800
> > > Steve Kargl <sgk@troutmask.apl.washington.edu> wrote:
> > > 
> > > > Pentium 4 is definitely broken on 5.x.  Perhaps, we should remove
> > > > the footshooting.
> > > > 
> > > > --- bsd.cpu.mk.orig     Sat Mar 22 10:23:42 2003
> > > > +++ bsd.cpu.mk  Sat Mar 22 10:27:11 2003
> > > > @@ -62,7 +62,9 @@
> > > >  .  elif ${CPUTYPE} == "k5"
> > > >  _CPUCFLAGS = -march=pentium
> > > >  .  elif ${CPUTYPE} == "p4"
> > > > -_CPUCFLAGS = -march=pentium4
> > > > +# XXX gcc 3.2.2 appears to generate bad code on FreeBSD 5.x
> > > > +#_CPUCFLAGS = -march=pentium4
why not
+_CPUCFLAGS = -march=pentium4 -mno-sse2
> choose, and in the case of pentium4 producing broken code the
> obvious fallback would be pentium3... 
above would be in fact the same because only the SSE2 code differs from
march=pentium3 which in turn only defines SSE additionally (which
probably generates the slower code compared to pentiumpro) as i see it. 
code generation for all x86 uses the same rules (i386.md) 
except that some rules only apply if TARGET_SSE2 is defined. 

till

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