Annotation of sys/lib/libkern/arch/amd64/index.S, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Written by J.T. Conklin <jtc@netbsd.org>.
! 3: * Public domain.
! 4: * Adapted for NetBSD/x86_64 by Frank van der Linden <fvdl@wasabisystems.com>
! 5: */
! 6:
! 7: #include <machine/asm.h>
! 8:
! 9: #if defined(LIBC_SCCS)
! 10: RCSID("$NetBSD: index.S,v 1.1 2001/06/19 00:22:46 fvdl Exp $")
! 11: #endif
! 12:
! 13: #ifdef STRCHR
! 14: ENTRY(strchr)
! 15: #else
! 16: ENTRY(index)
! 17: #endif
! 18: movq %rdi,%rax
! 19: movb %sil,%cl
! 20: L1:
! 21: movb (%rax),%dl
! 22: cmpb %dl,%cl /* found char? */
! 23: je L2
! 24: incq %rax
! 25: testb %dl,%dl /* null terminator? */
! 26: jnz L1
! 27: xorq %rax,%rax
! 28: L2:
! 29: ret
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