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ctz.S revision 1.1 
      1 /*	$NetBSD: ctz.S,v 1.1 2014/09/03 19:34:25 matt Exp $ */
      2 
      3 /*-
      4  * Copyright (C) 2001	Martin J. Laubach <mjl (at) NetBSD.org>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 /*----------------------------------------------------------------------*/
     30 
     31 #include <machine/asm.h>
     32 
     33 __RCSID("$NetBSD: ctz.S,v 1.1 2014/09/03 19:34:25 matt Exp $")
     34 
     35 ENTRY_NP(__ctzsi2)
     36 #ifdef _LP64
     37 	l.extwz	r3, r3
     38 #endif
     39 	l.ff1	r11, r3
     40 	l.addi	r11, r11, -1
     41 	l.jr	lr
     42 	l.nop
     43 END(__ctzsi2)
     44 
     45 ENTRY_NP(__ctzdi2)
     46 #ifdef _LP64
     47 	l.ff1	r11, r3
     48 	l.addi	r11, r11, -1
     49 	l.jr	lr
     50 	l.nop
     51 #else
     52 	l.sfeqi	r4, 0
     53 	l.bf	1f
     54 	l.nop
     55 
     56 	l.ff1	r11, r4
     57 	l.addi	r11, r11, -1
     58 	l.jr	lr
     59 	l.nop
     60 
     61 1:	l.sfeqi	r3, 0
     62 	l.addi	r12, r0, 64
     63 	l.ff1	r11, r3
     64 	l.addi	r11, r11, 31
     65 	l.cmov	r11, r12, r11
     66 	l.jr	lr
     67 	l.nop
     68 #endif
     69 END(__ctzdi2)
     70