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      1  1.3  maxv /*	$NetBSD: scanc.S,v 1.3 2017/10/30 17:13:39 maxv Exp $	*/
      2  1.1  fvdl 
      3  1.3  maxv /*
      4  1.1  fvdl  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  1.1  fvdl  * All rights reserved.
      6  1.1  fvdl  *
      7  1.1  fvdl  * This code is derived from software contributed to The NetBSD Foundation
      8  1.1  fvdl  * by Charles M. Hannum.
      9  1.1  fvdl  *
     10  1.1  fvdl  * Redistribution and use in source and binary forms, with or without
     11  1.1  fvdl  * modification, are permitted provided that the following conditions
     12  1.1  fvdl  * are met:
     13  1.1  fvdl  * 1. Redistributions of source code must retain the above copyright
     14  1.1  fvdl  *    notice, this list of conditions and the following disclaimer.
     15  1.1  fvdl  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.1  fvdl  *    notice, this list of conditions and the following disclaimer in the
     17  1.1  fvdl  *    documentation and/or other materials provided with the distribution.
     18  1.1  fvdl  *
     19  1.1  fvdl  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.1  fvdl  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.1  fvdl  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.1  fvdl  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.1  fvdl  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.1  fvdl  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.1  fvdl  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.1  fvdl  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.1  fvdl  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.1  fvdl  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.1  fvdl  * POSSIBILITY OF SUCH DAMAGE.
     30  1.1  fvdl  */
     31  1.1  fvdl 
     32  1.1  fvdl /*
     33  1.1  fvdl  * Adapted for NetBSD/x86_64 by Frank van der Linden <fvdl (at) wasabisystems.com>
     34  1.1  fvdl  */
     35  1.1  fvdl 
     36  1.1  fvdl #include <machine/asm.h>
     37  1.1  fvdl 
     38  1.1  fvdl ENTRY(scanc)
     39  1.1  fvdl 	movq	%rdx,%r11
     40  1.1  fvdl 	movb	%cl,%dl
     41  1.1  fvdl 	movl	%edi,%ecx
     42  1.1  fvdl 	testl	%ecx,%ecx
     43  1.1  fvdl 	jz	2f
     44  1.1  fvdl 	movq	%r11,%rdi
     45  1.1  fvdl 	xorq	%rax,%rax
     46  1.1  fvdl 	cld
     47  1.1  fvdl 1:
     48  1.1  fvdl 	lodsb
     49  1.1  fvdl 	testb	%dl,(%rax,%rdi)
     50  1.1  fvdl 	jnz	2f
     51  1.1  fvdl 	decl	%ecx
     52  1.1  fvdl 	jnz	1b
     53  1.1  fvdl 2:
     54  1.1  fvdl 	movl	%ecx,%eax
     55  1.1  fvdl 	ret
     56  1.3  maxv END(scanc)
     57