Date: Fri, 21 Mar 2003 21:14:43 -0800 From: David Schultz <das@FreeBSD.ORG> To: Till Riedel <till@f111.hadiko.de> Cc: freebsd-current@FreeBSD.ORG Subject: Re: libm problem Message-ID: <20030322051443.GA13854@HAL9000.homeunix.com> In-Reply-To: <20030322005435.GA8393@f111.hadiko.de> References: <20030318173051.GA2322@f111.hadiko.de> <20030319131317.GA670@HAL9000.homeunix.com> <20030321235237.GA8097@f111.hadiko.de> <20030322111233.F4471@gamplex.bde.org> <20030322005435.GA8393@f111.hadiko.de>
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Thus spake Till Riedel <till@f111.hadiko.de>: > I now know the thing that makes it break. > > cc -O2 -pipe -mcpu=pentiumpro -c /usr/src/lib/msun/src/e_pow.c > works fine! > cc -O0 -pipe -march=pentium4 -c /usr/src/lib/msun/src/e_pow.c > ... works > but... > cc -O -pipe -march=pentium4 -c /usr/src/lib/msun/src/e_pow.c > breaks it. Hey its only gcc :-), nothing to worry about. > I think that 0 is nice number: so why don't optimize everithing to down it. > -O seems to minimize numbers not calculation time. Does anyone know the > flag to turn that off. If you have the time and inclination, I suggest reporting this problem to the gcc folks. For now, don't use Pentium 4 optimizations. Not only are they apparently broken, they also generate slower code than you get by optimizing for a PPro, or even a 386. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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