Source to machdep/i386/longlong.h

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */

/*
 * Routines to optimize some forms of long-long math.
 *
 * Copyright (c) 1992 NeXT, Inc.
 *
 * HISTORY
 *
 *  1Nov92 Brian Pinkerton at NeXT
 *	Created.
 */

static inline void
llp_div_l(unsigned long long *ll, unsigned int divisor, unsigned int *remain)
{
    unsigned int *msw, *lsw;
    unsigned int quo, rem1, rem2;
    union foo {
	unsigned long long ll;
	unsigned int i[2];
    } *llp;

    llp = (union foo *) ll;
    lsw = &llp->i[0];
    msw = &llp->i[1];

    asm("divl %2"
	: "=a" (quo), "=d" (rem1)
	: "rm" (divisor), "0" (*msw), "1" (0));

    *msw = quo;

    asm("divl %2"
	: "=a" (quo), "=d" (*remain)
	: "rm" (divisor), "0" (*lsw), "1" (rem1));

    *lsw = quo;
}


static inline unsigned int
ll_div_l(unsigned long long ll, unsigned int divisor)
{
    unsigned int *msw, *lsw;
    unsigned int quo, rem1;
    union foo {
	unsigned long long ll;
	unsigned int i[2];
    } *llp;

    llp = (union foo *) ≪
    lsw = &llp->i[0];
    msw = &llp->i[1];

    asm("divl %2"
	: "=a" (quo), "=d" (rem1)
	: "rm" (divisor), "0" (*msw), "1" (0));

    asm("divl %1"
	: "=a" (quo)
	: "rm" (divisor), "0" (*lsw), "d" (rem1));

    return quo;
}