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Annotation of kernel/machdep/i386/longlong.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /*
                     26:  * Routines to optimize some forms of long-long math.
                     27:  *
                     28:  * Copyright (c) 1992 NeXT, Inc.
                     29:  *
                     30:  * HISTORY
                     31:  *
                     32:  *  1Nov92 Brian Pinkerton at NeXT
                     33:  *     Created.
                     34:  */
                     35: 
                     36: static inline void
                     37: llp_div_l(unsigned long long *ll, unsigned int divisor, unsigned int *remain)
                     38: {
                     39:     unsigned int *msw, *lsw;
                     40:     unsigned int quo, rem1, rem2;
                     41:     union foo {
                     42:        unsigned long long ll;
                     43:        unsigned int i[2];
                     44:     } *llp;
                     45: 
                     46:     llp = (union foo *) ll;
                     47:     lsw = &llp->i[0];
                     48:     msw = &llp->i[1];
                     49: 
                     50:     asm("divl %2"
                     51:        : "=a" (quo), "=d" (rem1)
                     52:        : "rm" (divisor), "0" (*msw), "1" (0));
                     53: 
                     54:     *msw = quo;
                     55: 
                     56:     asm("divl %2"
                     57:        : "=a" (quo), "=d" (*remain)
                     58:        : "rm" (divisor), "0" (*lsw), "1" (rem1));
                     59: 
                     60:     *lsw = quo;
                     61: }
                     62: 
                     63: 
                     64: static inline unsigned int
                     65: ll_div_l(unsigned long long ll, unsigned int divisor)
                     66: {
                     67:     unsigned int *msw, *lsw;
                     68:     unsigned int quo, rem1;
                     69:     union foo {
                     70:        unsigned long long ll;
                     71:        unsigned int i[2];
                     72:     } *llp;
                     73: 
                     74:     llp = (union foo *) ≪
                     75:     lsw = &llp->i[0];
                     76:     msw = &llp->i[1];
                     77: 
                     78:     asm("divl %2"
                     79:        : "=a" (quo), "=d" (rem1)
                     80:        : "rm" (divisor), "0" (*msw), "1" (0));
                     81: 
                     82:     asm("divl %1"
                     83:        : "=a" (quo)
                     84:        : "rm" (divisor), "0" (*lsw), "d" (rem1));
                     85: 
                     86:     return quo;
                     87: }

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