1 /* $NetBSD: maskbits.h,v 1.10 2025/05/31 18:50:33 tsutsui Exp $ */ 2 /* $OpenBSD: maskbits.h,v 1.6 2006/08/05 09:58:56 miod Exp $ */ 3 /* NetBSD: maskbits.h,v 1.3 1997/03/31 07:37:28 scottr Exp */ 4 5 /*- 6 * Copyright (c) 1994 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)maskbits.h 8.2 (Berkeley) 3/21/94 34 */ 35 36 /* 37 * Derived from X11R4 38 */ 39 40 /* the following notes use the following conventions: 41 * SCREEN LEFT SCREEN RIGHT 42 * in this file and maskbits.c, left and right refer to screen coordinates, 43 * NOT bit numbering in registers. 44 * 45 * rasops_lmask[n] 46 * bits[0,n-1] = 0 bits[n,31] = 1 47 * rasops_rmask[n] = 48 * bits[0,n-1] = 1 bits[n,31] = 0 49 * 50 * maskbits(x, w, startmask, endmask, nlw) 51 * for a span of width w starting at position x, returns 52 * a mask for ragged bits at start, mask for ragged bits at end, 53 * and the number of whole longwords between the ends. 54 * 55 */ 56 57 #define maskbits(x, w, startmask, endmask, nlw) \ 58 do { \ 59 startmask = rasops_lmask[(x) & 0x1f]; \ 60 endmask = rasops_rmask[((x) + (w)) & 0x1f]; \ 61 if (startmask) \ 62 nlw = (((w) - (32 - ((x) & 0x1f))) >> 5); \ 63 else \ 64 nlw = (w) >> 5; \ 65 } while (/* CONSTCOND */ 0) 66 67 #define FASTGETBITS(psrc, x, w, dst) \ 68 asm ("bfextu %3{%1:%2},%0" \ 69 : "=d" (dst) : "di" (x), "di" (w), "o" (*(uint8_t *)(psrc))) 70 71 #define FASTPUTBITS(src, x, w, pdst) \ 72 asm ("bfins %3,%0{%1:%2}" \ 73 : "=o" (*(uint8_t *)(pdst)) \ 74 : "di" (x), "di" (w), "d" (src)) 75 76 #define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \ 77 do { \ 78 uint32_t _tmpdst; \ 79 if (rop == RR_CLEAR) \ 80 _tmpdst = 0; \ 81 else \ 82 FASTGETBITS(psrc, srcbit, width, _tmpdst); \ 83 FASTPUTBITS(_tmpdst, dstbit, width, pdst); \ 84 } while (/* CONSTCOND */ 0) 85 86 #define getunalignedword(psrc, x, dst) \ 87 do { \ 88 uint32_t _tmp; \ 89 FASTGETBITS(psrc, x, 32, _tmp); \ 90 dst = _tmp; \ 91 } while (/* CONSTCOND */ 0) 92
Indexes created Sat Sep 20 22:09:52 GMT 2025