Date: Wed, 15 Dec 2004 09:42:26 -0500 From: John Baldwin <jhb@FreeBSD.org> To: freebsd-alpha@FreeBSD.org Subject: Re: Safe (but quick) GCC settings on a PC64 with 5.3? Message-ID: <200412150942.26797.jhb@FreeBSD.org> In-Reply-To: <8B2E39C7-4D3C-11D9-BEF4-000D93C47836@xcllnt.net> References: <200412131130.59807.kirk@strauser.com> <200412131300.34382.kirk@strauser.com> <8B2E39C7-4D3C-11D9-BEF4-000D93C47836@xcllnt.net>
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On Monday 13 December 2004 02:24 pm, Marcel Moolenaar wrote: > On Dec 13, 2004, at 11:00 AM, Kirk Strauser wrote: > > Out of curiosity, on my Athlon systems I can set "CPUTYPE=athlon-tbird" > > in /etc/make.conf and it will automatically add "-march=athlon-tbird" > > to my > > system and ports builds. On my Alpha, though, it only adds > > "-mcpu=ev45" > > and not the expected "-march=ev45". Is this general to all Alphas, or > > is > > it because my ev45 is the bottom of the barrel instruction-wise so > > there's > > no instruction set optimization to be had? > > The interpretation of the -m options vary per platform. The meaning of > -mcpu > on alpha is the same as -march on i386: instruction selection and > scheduling. > -mtune is used to control instruction scheduling only and on i386 (at > least) > -mcpu is a deprecated synonym for that. It's a bit odd, but it looks > like the > GCC folks are trying to normalize things here. > > See also: > http://gcc.gnu.org/onlinedocs/gcc-3.4.3/gcc/Submodel- > Options.html#Submodel-Options You can just use 'CPUTYPE' in /etc/make.conf as on the other archs and let it set the gcc -mcpu=foo option for you. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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