Date: Sat, 08 Feb 2003 23:10:32 -0600 (CST) From: Conrad Sabatier <conrads@cox.net> To: Dan Nelson <dnelson@allantgroup.com> Cc: freebsd-current@FreeBSD.ORG, Ray Kohler <ataraxia@cox.net> Subject: Re: Compiling with high optimization? Message-ID: <XFMail.20030208231032.conrads@cox.net> In-Reply-To: <20030209050045.GD5356@dan.emsphone.com>
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On 09-Feb-2003 Dan Nelson wrote: > 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. Yes, I figured some of them were redundant, but it was kind of hard to figure out which ones, so I just went ahead and used them. :-) -- Conrad Sabatier <conrads@cox.net> - "In Unix veritas" To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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