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maskbits.h revision 1.1 
      1 /*	$NetBSD: maskbits.h,v 1.1 2023/02/11 05:59:39 tsutsui Exp $	*/
      2 /*	$OpenBSD: maskbits.h,v 1.1 2006/08/05 10:00:30 miod Exp $	*/
      3 
      4 /*-
      5  * Copyright (c) 1994
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the University nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  *
     32  *	@(#)maskbits.h	8.2 (Berkeley) 3/21/94
     33  */
     34 
     35 /*
     36  * Derived from X11R4
     37  */
     38 
     39 #define	FASTGETBITS(psrc,x,w,dst)					\
     40 	__asm__ ("extzv %1,%2,%3,%0"					\
     41 		: "=g" (dst)						\
     42 		: "g" (x), "g" (w), "m" (*(char *)(psrc)))
     43 
     44 #define	FASTPUTBITS(src, x, w, pdst)					\
     45 	__asm__ ("insv %3,%1,%2,%0"					\
     46 		: "=m" (*(char *)(pdst))				\
     47 		: "g" (x), "g" (w), "g" (src))
     48 
     49 #define	RR_CLEAR	0x00
     50 #define	RR_SET		0x01
     51 #define	RR_COPY		0x02
     52 
     53 #define getandputrop(psrc, srcbit, dstbit, width, pdst, rop)		\
     54 do {									\
     55 	unsigned int _tmpdst;						\
     56 	switch (rop) {							\
     57 	case RR_CLEAR:							\
     58 		_tmpdst = 0;						\
     59 		break;							\
     60 	case RR_SET:							\
     61 		_tmpdst = ~0;						\
     62 		break;							\
     63 	default:							\
     64 		FASTGETBITS(psrc, srcbit, width, _tmpdst);		\
     65 		break;							\
     66 	}								\
     67 	FASTPUTBITS(_tmpdst, dstbit, width, pdst);			\
     68 } while (0)
     69 
     70 #define getunalignedword(psrc, x, dst)					\
     71 do {									\
     72         int _tmp;							\
     73         FASTGETBITS(psrc, x, 32, _tmp);					\
     74         dst = _tmp;							\
     75 } while (0)
     76