Date: Tue, 21 Aug 2007 15:10:08 GMT From: Simun Mikecin <numisemis@yahoo.com> To: freebsd-amd64@FreeBSD.org Subject: Re: amd64/115581: [patch] -mfancy-math-387 has no effect Message-ID: <200708211510.l7LFA8nv000277@freefall.freebsd.org>
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The following reply was made to PR amd64/115581; it has been noted by GNATS. From: Simun Mikecin <numisemis@yahoo.com> To: Bruce Evans <brde@optusnet.com.au> Cc: bug-followup@freebsd.org Subject: Re: amd64/115581: [patch] -mfancy-math-387 has no effect Date: Tue, 21 Aug 2007 07:37:41 -0700 (PDT) --- Bruce Evans <brde@optusnet.com.au> wrote: > > This PR is about -mfancy-math-387 usage when compiling 32-bit compatibility > > libraries that are gone be used on FreeBSD/amd64. > > As far as I can see FreeBSD's libm on i386 uses those fancy instructions (for > > example /usr/src.current/lib/msun/i387/s_sin.S), so the same libm will be > > used for running 32-bit apps on FreeBSD/amd64. > Well, that's in asm so it is not affected by compiler flags. Compiler > flags can cause the library to be not used at all in some cases where > the library is better. I'm just wondering will it have a positive impact on performance if FreeBSD/i386 libm is changed not to use that asm code with fancy instructions (just like FreeBSD/amd64 does). Sime ____________________________________________________________________________________ Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos & more. http://mobile.yahoo.com/go?refer=1GNXIC
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