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From: Michael Nottebrock <michaelnottebrock@gmx.net>
To: Till Riedel <till@f111.hadiko.de>, Anti <fearow@attbi.com>
Subject: Re: libm problem
Date: Sun, 23 Mar 2003 18:43:16 +0100
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References: <20030318173051.GA2322@f111.hadiko.de> <20030323070808.0d3f63c0.fearow@attbi.com> <20030323170244.GA1911@f111.hadiko.de>
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On Sunday 23 March 2003 18:02, Till Riedel wrote:
> why not
> +_CPUCFLAGS =3D -march=3Dpentium4 -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=3Dpentium3 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.

Just out of curiousity, have you tried using -mfpmath=3Dsse? I remember som=
eone=20
on this list claiming that the SSE fpa-code works much better than the i387=
=20
code which is used by default (even with -march=3Dpentium4).

=2D-=20
Regards,
	Michael Nottebrock

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