maskbits.h revision 1.7.10.1
1 1.7.10.1 elad /* $NetBSD: maskbits.h,v 1.7.10.1 2006/04/19 02:32:38 elad Exp $ */ 2 1.2 cgd 3 1.1 mycroft /*- 4 1.1 mycroft * Copyright (c) 1994 5 1.1 mycroft * The Regents of the University of California. All rights reserved. 6 1.1 mycroft * 7 1.1 mycroft * Redistribution and use in source and binary forms, with or without 8 1.1 mycroft * modification, are permitted provided that the following conditions 9 1.1 mycroft * are met: 10 1.1 mycroft * 1. Redistributions of source code must retain the above copyright 11 1.1 mycroft * notice, this list of conditions and the following disclaimer. 12 1.1 mycroft * 2. Redistributions in binary form must reproduce the above copyright 13 1.1 mycroft * notice, this list of conditions and the following disclaimer in the 14 1.1 mycroft * documentation and/or other materials provided with the distribution. 15 1.5 agc * 3. Neither the name of the University nor the names of its contributors 16 1.1 mycroft * may be used to endorse or promote products derived from this software 17 1.1 mycroft * without specific prior written permission. 18 1.1 mycroft * 19 1.1 mycroft * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 1.1 mycroft * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 1.1 mycroft * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 1.1 mycroft * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 1.1 mycroft * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 1.1 mycroft * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 1.1 mycroft * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 1.1 mycroft * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 1.1 mycroft * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 1.1 mycroft * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 1.1 mycroft * SUCH DAMAGE. 30 1.1 mycroft * 31 1.2 cgd * @(#)maskbits.h 8.2 (Berkeley) 3/21/94 32 1.1 mycroft */ 33 1.1 mycroft 34 1.1 mycroft /* 35 1.1 mycroft * Derived from X11R4 36 1.1 mycroft */ 37 1.1 mycroft 38 1.1 mycroft /* the following notes use the following conventions: 39 1.1 mycroft SCREEN LEFT SCREEN RIGHT 40 1.1 mycroft in this file and maskbits.c, left and right refer to screen coordinates, 41 1.1 mycroft NOT bit numbering in registers. 42 1.1 mycroft 43 1.1 mycroft starttab[n] 44 1.1 mycroft bits[0,n-1] = 0 bits[n,31] = 1 45 1.1 mycroft endtab[n] = 46 1.1 mycroft bits[0,n-1] = 1 bits[n,31] = 0 47 1.1 mycroft 48 1.1 mycroft maskbits(x, w, startmask, endmask, nlw) 49 1.1 mycroft for a span of width w starting at position x, returns 50 1.1 mycroft a mask for ragged bits at start, mask for ragged bits at end, 51 1.1 mycroft and the number of whole longwords between the ends. 52 1.1 mycroft 53 1.1 mycroft */ 54 1.1 mycroft 55 1.7.10.1 elad #define maskbits(x, w, startmask, endmask, nlw) \ 56 1.7.10.1 elad do { \ 57 1.7.10.1 elad startmask = starttab[(x) & 0x1f]; \ 58 1.7.10.1 elad endmask = endtab[((x)+(w)) & 0x1f]; \ 59 1.7.10.1 elad if (startmask) \ 60 1.7.10.1 elad nlw = (((w) - (32 - ((x)&0x1f))) >> 5); \ 61 1.7.10.1 elad else \ 62 1.7.10.1 elad nlw = (w) >> 5; \ 63 1.7.10.1 elad } while (/* CONSTCOND */ 0) 64 1.7.10.1 elad 65 1.7.10.1 elad #define FASTGETBITS(psrc, x, w, dst) \ 66 1.7.10.1 elad __asm ("bfextu %3{%1:%2},%0" \ 67 1.7.10.1 elad : "=d" (dst) : "di" (x), "di" (w), "o" (*(char *)(psrc))) 68 1.7.10.1 elad 69 1.7.10.1 elad #define FASTPUTBITS(src, x, w, pdst) \ 70 1.7.10.1 elad __asm ("bfins %3,%0{%1:%2}" \ 71 1.7.10.1 elad : "=o" (*(char *)(pdst)) \ 72 1.7.10.1 elad : "di" (x), "di" (w), "d" (src)) 73 1.7.10.1 elad 74 1.7.10.1 elad #define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \ 75 1.7.10.1 elad do { \ 76 1.7.10.1 elad unsigned int _tmpsrc, _tmpdst; \ 77 1.7.10.1 elad FASTGETBITS(pdst, dstbit, width, _tmpdst); \ 78 1.7.10.1 elad FASTGETBITS(psrc, srcbit, width, _tmpsrc); \ 79 1.7.10.1 elad DoRop(_tmpdst, rop, _tmpsrc, _tmpdst); \ 80 1.7.10.1 elad FASTPUTBITS(_tmpdst, dstbit, width, pdst); \ 81 1.7.10.1 elad } while (/* CONSTCOND */ 0) 82 1.1 mycroft 83 1.1 mycroft #define getandputrop0(psrc, srcbit, width, pdst, rop) \ 84 1.7.10.1 elad getandputrop(psrc, srcbit, 0, width, pdst, rop) 85 1.1 mycroft 86 1.7.10.1 elad #define getunalignedword(psrc, x, dst) \ 87 1.7.10.1 elad do { \ 88 1.7.10.1 elad int _tmp; \ 89 1.7.10.1 elad FASTGETBITS(psrc, x, 32, _tmp); \ 90 1.7.10.1 elad dst = _tmp; \ 91 1.7.10.1 elad } while (/* CONSTCOND */ 0) 92 1.1 mycroft 93 1.1 mycroft #define fnCLEAR(src, dst) (0) 94 1.1 mycroft #define fnCOPY(src, dst) (src) 95 1.1 mycroft #define fnXOR(src, dst) (src ^ dst) 96 1.1 mycroft #define fnCOPYINVERTED(src, dst)(~src) 97 1.1 mycroft 98 1.1 mycroft #define DoRop(result, alu, src, dst) \ 99 1.7.10.1 elad do { \ 100 1.7.10.1 elad if (alu == RR_COPY) \ 101 1.7.10.1 elad result = fnCOPY (src, dst); \ 102 1.7.10.1 elad else { \ 103 1.7.10.1 elad switch (alu) { \ 104 1.7.10.1 elad case RR_CLEAR: \ 105 1.7.10.1 elad result = fnCLEAR (src, dst); \ 106 1.7.10.1 elad break; \ 107 1.7.10.1 elad case RR_XOR: \ 108 1.7.10.1 elad result = fnXOR (src, dst); \ 109 1.7.10.1 elad break; \ 110 1.7.10.1 elad case RR_COPYINVERTED: \ 111 1.7.10.1 elad result = fnCOPYINVERTED (src, dst); \ 112 1.7.10.1 elad break; \ 113 1.7.10.1 elad } \ 114 1.7.10.1 elad } \ 115 1.7.10.1 elad } while (/* CONSTCOND */ 0) 116
Indexes created Thu Oct 02 14:10:14 GMT 2025