Date: Sat, 8 Feb 2003 23:00:45 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Conrad Sabatier <conrads@cox.net> Cc: Ray Kohler <ataraxia@cox.net>, freebsd-current@FreeBSD.ORG Subject: Re: Compiling with high optimization? Message-ID: <20030209050045.GD5356@dan.emsphone.com> In-Reply-To: <XFMail.20030208220148.conrads@cox.net> References: <20030208173756.GA56030@arkadia.nv.cox.net> <XFMail.20030208220148.conrads@cox.net>
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In the last episode (Feb 08), Conrad Sabatier said: > Call me a fool, but I've been using this for quite some time now, in both > -stable (well, with slight modifications) and -current: > > CPUTYPE?=k7 > > CFLAGS= -O2 -pipe -mmmx -m3dnow -fforce-mem -fforce-addr -fstrength-reduce \ > -fthread-jumps -fcse-follow-jumps -fcse-skip-blocks -frerun-cse-after-loop \ > -fexpensive-optimizations -fschedule-insns2 Have you actually tested the benefits of these switches? If you had, you would have discovered that -fforce-mem, -fstrength-reduce, -fthread-jumps, -fcse-follow-jumps, -fcse-skip-blocks, -frerun-cse-after-loop, -fexpensive-optimizations, and -fschedule-insns2 do absolutely nothing, since -O2 enables them anyway. -fforce-addr is the only non-redundant -f flag in that whole list. -- Dan Nelson dnelson@allantgroup.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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