/* $NetBSD: maskbits.h,v 1.10 2025/05/31 18:50:33 tsutsui Exp $ */

/* $NetBSD: maskbits.h,v 1.10 2025/05/31 18:50:33 tsutsui Exp $ */
/* $OpenBSD: maskbits.h,v 1.6 2006/08/05 09:58:56 miod Exp $ */
/* NetBSD: maskbits.h,v 1.3 1997/03/31 07:37:28 scottr Exp */

/*-
* Copyright (c) 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)maskbits.h 8.2 (Berkeley) 3/21/94
*/

/*
* Derived from X11R4
*/

/* the following notes use the following conventions:
* SCREEN LEFT SCREEN RIGHT
* in this file and maskbits.c, left and right refer to screen coordinates,
* NOT bit numbering in registers.
*
* rasops_lmask[n]
* bits[0,n-1] = 0 bits[n,31] = 1
* rasops_rmask[n] =
* bits[0,n-1] = 1 bits[n,31] = 0
*
* maskbits(x, w, startmask, endmask, nlw)
* for a span of width w starting at position x, returns
* a mask for ragged bits at start, mask for ragged bits at end,
* and the number of whole longwords between the ends.
*
*/

#define maskbits(x, w, startmask, endmask, nlw) \
do { \
startmask = rasops_lmask[(x) & 0x1f]; \
endmask = rasops_rmask[((x) + (w)) & 0x1f]; \
if (startmask) \
nlw = (((w) - (32 - ((x) & 0x1f))) >> 5); \
else \
nlw = (w) >> 5; \
} while (/* CONSTCOND */ 0)

#define FASTGETBITS(psrc, x, w, dst) \
asm ("bfextu %3{%1:%2},%0" \
: "=d" (dst) : "di" (x), "di" (w), "o" (*(uint8_t *)(psrc)))

#define FASTPUTBITS(src, x, w, pdst) \
asm ("bfins %3,%0{%1:%2}" \
: "=o" (*(uint8_t *)(pdst)) \
: "di" (x), "di" (w), "d" (src))

#define getandputrop(psrc, srcbit, dstbit, width, pdst, rop) \
do { \
uint32_t _tmpdst; \
if (rop == RR_CLEAR) \
_tmpdst = 0; \
else \
FASTGETBITS(psrc, srcbit, width, _tmpdst); \
FASTPUTBITS(_tmpdst, dstbit, width, pdst); \
} while (/* CONSTCOND */ 0)

#define getunalignedword(psrc, x, dst) \
do { \
uint32_t _tmp; \
FASTGETBITS(psrc, x, 32, _tmp); \
dst = _tmp; \
} while (/* CONSTCOND */ 0)