22 lines
562 B
ArmAsm
22 lines
562 B
ArmAsm
/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Public domain.
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* Adapted for NetBSD/x86_64 by Frank van der Linden <fvdl@wasabisystems.com>
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*/
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#include <machine/asm.h>
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#if defined(LIBC_SCCS)
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RCSID("$NetBSD: strlen.S,v 1.1 2001/06/19 00:25:05 fvdl Exp $")
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#endif
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ENTRY(strlen)
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cld /* set search forward */
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xorl %eax,%eax /* set search for null terminator */
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movq $-1,%rcx /* set search for lots of characters */
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repne /* search! */
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scasb
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notq %rcx /* get length by taking complement */
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leaq -1(%rcx),%rax /* and subtracting one */
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ret
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