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File: [cvs.NetBSD.org] / src / lib / libc / arch / x86_64 / string / strncmp.S (download)

Revision 1.3, Wed Aug 3 22:59:50 2005 UTC (15 years, 4 months ago) by rpaulo
Branch: MAIN
CVS Tags: yamt-pf42-baseX, yamt-pf42-base4, yamt-pf42-base3, yamt-pf42-base2, yamt-pf42-base, yamt-pf42, yamt-pagecache-tag8, yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, yamt-pagecache, wrstuden-revivesa-base-3, wrstuden-revivesa-base-2, wrstuden-revivesa-base-1, wrstuden-revivesa-base, wrstuden-revivesa, wrstuden-fixsa-newbase, wrstuden-fixsa-base-1, wrstuden-fixsa-base, wrstuden-fixsa, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, netbsd-5-base, netbsd-5-2-RELEASE, netbsd-5-2-RC1, netbsd-5-2-3-RELEASE, netbsd-5-2-2-RELEASE, netbsd-5-2-1-RELEASE, netbsd-5-2, netbsd-5-1-RELEASE, netbsd-5-1-RC4, netbsd-5-1-RC3, netbsd-5-1-RC2, netbsd-5-1-RC1, netbsd-5-1-5-RELEASE, netbsd-5-1-4-RELEASE, netbsd-5-1-3-RELEASE, netbsd-5-1-2-RELEASE, netbsd-5-1-1-RELEASE, netbsd-5-1, netbsd-5-0-RELEASE, netbsd-5-0-RC4, netbsd-5-0-RC3, netbsd-5-0-RC2, netbsd-5-0-RC1, netbsd-5-0-2-RELEASE, netbsd-5-0-1-RELEASE, netbsd-5-0, netbsd-5, netbsd-4-base, netbsd-4-0-RELEASE, netbsd-4-0-RC5, netbsd-4-0-RC4, netbsd-4-0-RC3, netbsd-4-0-RC2, netbsd-4-0-RC1, netbsd-4-0-1-RELEASE, netbsd-4-0, netbsd-4, mjf-devfs2-base, mjf-devfs2, matt-premerge-20091211, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, matt-nb5-pq3-base, matt-nb5-pq3, matt-nb5-mips64-u2-k2-k4-k7-k8-k9, matt-nb5-mips64-u1-k1-k5, matt-nb5-mips64-premerge-20101231, matt-nb5-mips64-premerge-20091211, matt-nb5-mips64-k15, matt-nb5-mips64, matt-nb4-mips64-k7-u2a-k9b, matt-mips64-premerge-20101231, matt-mips64-base2, matt-mips64-base, matt-mips64, matt-armv6-prevmlocking, matt-armv6-nbase, matt-armv6-base, matt-armv6, keiichi-mipv6-base, keiichi-mipv6, jym-xensuspend-nbase, jym-xensuspend-base, jym-xensuspend, hpcarm-cleanup-nbase, hpcarm-cleanup-base, hpcarm-cleanup, cube-autoconf-base, cube-autoconf, christos-time_t-nbase, christos-time_t-base, christos-time_t, cherry-xenmp-base, cherry-xenmp, bouyer-quota2-nbase, bouyer-quota2-base, bouyer-quota2, agc-symver-base, agc-symver, abandoned-netbsd-4-base, abandoned-netbsd-4
Branch point for: tls-maxphys, tls-earlyentropy
Changes since 1.2: +2 -2 lines

Fix another typo in comments found by Ricardo Nabinger Sanchez
on the freebsd-arch mailing list.

/*
 * Written by J.T. Conklin <jtc@NetBSD.org>.
 * Public domain.
 */

#include <machine/asm.h>

#if defined(LIBC_SCCS)
        RCSID("$NetBSD: strncmp.S,v 1.3 2005/08/03 22:59:50 rpaulo Exp $")
#endif

/*
 * NOTE: I've unrolled the loop eight times: large enough to make a
 * significant difference, and small enough not to totally trash the
 * cache.
 */

ENTRY(strncmp)
	testq	%rdx,%rdx
	jmp	L2			/* Jump into the loop! */

L1:	incq	%rdi
	incq	%rsi
	decq	%rdx
L2:	jz	L4			/* strings are equal */
	movb	(%rdi),%al
	testb	%al,%al
	jz	L3
	cmpb	%al,(%rsi)
	jne	L3

	incq	%rdi
	incq	%rsi
	decq	%rdx
	jz	L4
	movb	(%rdi),%al
	testb	%al,%al
	jz	L3
	cmpb	%al,(%rsi)
	jne	L3

	incq	%rdi
	incq	%rsi
	decq	%rdx
	jz	L4
	movb	(%rdi),%al
	testb	%al,%al
	jz	L3
	cmpb	%al,(%rsi)
	jne	L3

	incq	%rdi
	incq	%rsi
	decq	%rdx
	jz	L4
	movb	(%rdi),%al
	testb	%al,%al
	jz	L3
	cmpb	%al,(%rsi)
	jne	L3

	incq	%rdi
	incq	%rsi
	decq	%rdx
	jz	L4
	movb	(%rdi),%al
	testb	%al,%al
	jz	L3
	cmpb	%al,(%rsi)
	jne	L3

	incq	%rdi
	incq	%rsi
	decq	%rdx
	jz	L4
	movb	(%rdi),%al
	testb	%al,%al
	jz	L3
	cmpb	%al,(%rsi)
	jne	L3

	incq	%rdi
	incq	%rsi
	decq	%rdx
	jz	L4
	movb	(%rdi),%al
	testb	%al,%al
	jz	L3
	cmpb	%al,(%rsi)
	jne	L3

	incq	%rdi
	incq	%rsi
	decq	%rdx
	jz	L4
	movb	(%rdi),%al
	testb	%al,%al
	jz	L3
	cmpb	%al,(%rsi)
	je	L1

L3:	movzbl	(%rdi),%eax		/* unsigned comparison */
	movzbl	(%rsi),%ecx
	subl	%ecx,%eax
	ret
L4:	xorl	%eax,%eax
	ret