Date: Mon, 27 Mar 2006 14:20:44 -0500 From: Kris Kennaway <kris@obsecurity.org> To: Nikolas Britton <nikolas.britton@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: -march=pentium2 + -mtune=pentium4 faster then -march=pentium4? Message-ID: <20060327192044.GA70891@xor.obsecurity.org> In-Reply-To: <ef10de9a0603271105v3f68bd69q883e853366fb36d@mail.gmail.com> References: <ef10de9a0603271105v3f68bd69q883e853366fb36d@mail.gmail.com>
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--2oS5YaxWCcQjTEyO Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Mar 27, 2006 at 01:05:13PM -0600, Nikolas Britton wrote: > Why does GCC produce faster code using "-march=3Dpentium2 > -mtune=3Dpentium4" on a Pentium 4 chip versus plain -march=3Dpentium4? >=20 > Try it... >=20 > CPUTYPE=3Dpentium2 > CFLAGS+=3D -mtune=3Dpentium4 > COPTFLAGS+=3D -mtune=3Dpentium4 Talk to the gcc developers (and provide benchmarks).=20 Kris --2oS5YaxWCcQjTEyO Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (FreeBSD) iD8DBQFEKDsLWry0BWjoQKURAvKPAJ91rBoVQgbwDwZHXppdz/b89n4SqACeOuDd l3FOQ9dRbqPp1XGxm/TYIgo= =U65s -----END PGP SIGNATURE----- --2oS5YaxWCcQjTEyO--
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