Date: Tue, 14 May 2002 19:57:46 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Bruce Evans <bde@FreeBSD.org> Cc: cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org Subject: RE: cvs commit: src/sys/boot/i386/boot2 Makefile Message-ID: <XFMail.20020514195746.jhb@FreeBSD.org> In-Reply-To: <200205121545.g4CFjTT12885@freefall.freebsd.org>
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On 12-May-2002 Bruce Evans wrote: > bde 2002/05/12 08:45:28 PDT > > Modified files: > sys/boot/i386/boot2 Makefile > Log: > Saved 176 bytes by compiling with -fno-guess-branch-probability. The > default of -fguess-branch-probablility causes time optimizations (?) > like rewriting `if (foo) x++;' as > `if (!foo) goto forth; back: ; ...; forth: x++; goto back;". This is > pessimizes space especially well on i386's because one short branch > gets converted to 2 long ones. Ah. Nice find. Thanks. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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