Date: Sun, 23 Mar 2003 18:43:16 +0100 From: Michael Nottebrock <michaelnottebrock@gmx.net> To: Till Riedel <till@f111.hadiko.de>, 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: <200303231843.16545.michaelnottebrock@gmx.net> In-Reply-To: <20030323170244.GA1911@f111.hadiko.de> References: <20030318173051.GA2322@f111.hadiko.de> <20030323070808.0d3f63c0.fearow@attbi.com> <20030323170244.GA1911@f111.hadiko.de>
index | next in thread | previous in thread | raw e-mail
[-- Attachment #1 --] On Sunday 23 March 2003 18:02, Till Riedel wrote: > 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. Just out of curiousity, have you tried using -mfpmath=sse? I remember someone on this list claiming that the SSE fpa-code works much better than the i387 code which is used by default (even with -march=pentium4). -- Regards, Michael Nottebrock [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (FreeBSD) iD8DBQA+ffI0Xhc68WspdLARAmO/AJ9OqK1a2lkvuoJUsHXDXM2xRVUrAwCeJ7M5 t5QmXR5l+CKmMwrYoqdunFo= =kruC -----END PGP SIGNATURE-----help
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200303231843.16545.michaelnottebrock>