Date: Tue, 18 Feb 2003 22:45:05 -0800 (PST) From: Juli Mallett <jmallett@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 25411 for review Message-ID: <200302190645.h1J6j5Vf068703@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=25411 Change 25411 by jmallett@jmallett_dalek on 2003/02/18 22:44:59 Avoid branch conditional issues, real and imagined. Use unsigned byte loads, to fetch one character. Affected files ... .. //depot/projects/mips/sys/mips/mips/support.S#5 edit Differences ... ==== //depot/projects/mips/sys/mips/mips/support.S#5 (text+ko) ==== @@ -44,13 +44,14 @@ */ ENTRY(bcopy) beqz a2, 2f + nop subu a2, 1 -1: lb t0, (a0) +1: lbu t0, (a0) addu a0, 1 sb t0, (a1) + subu a2, 1 + bnezl a2, 1b addu a1, 1 - bnezl a2, 1b - subu a2, 1 2: jr ra nop END(bcopy) @@ -61,11 +62,12 @@ */ ENTRY(bzero) beqz a1, 2f + nop subu a1, 1 1: sb zero, (a0) + subu a1, 1 + bnezl a1, 1b addu a0, 1 - bnezl a1, 1b - subu a1, 1 2: jr ra nop END(bzero) @@ -75,15 +77,15 @@ * <v0>void *memcpy(<a0>void *dst, <a1>const void *src, <a2>size_t len) */ ENTRY(memcpy) + beqz a2, 2f move v0, a0 - beqz a2, 2f subu a2, 1 -1: lb t0, (a1) +1: lbu t0, (a1) addu a1, 1 sb t0, (a0) + subu a2, 1 + bnezl a2, 1b addu a0, 1 - bnezl a2, 1b - subu a2, 1 2: jr ra nop END(memcpy) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe p4-projects" in the body of the message
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