The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/ashldi3.c

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    1 /*      $NetBSD: ashldi3.c,v 1.8 2003/08/07 16:32:06 agc Exp $  */
    2 
    3 /*-
    4  * Copyright (c) 1992, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This software was developed by the Computer Systems Engineering group
    8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
    9  * contributed to Berkeley.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 #if defined(LIBC_SCCS) && !defined(lint)
   38 #if 0
   39 static char sccsid[] = "@(#)ashldi3.c   8.1 (Berkeley) 6/4/93";
   40 #else
   41 __RCSID("$NetBSD: ashldi3.c,v 1.8 2003/08/07 16:32:06 agc Exp $");
   42 #endif
   43 #endif /* LIBC_SCCS and not lint */
   44 
   45 #include "quad.h"
   46 
   47 /*
   48  * Shift a (signed) quad value left (arithmetic shift left).
   49  * This is the same as logical shift left!
   50  */
   51 quad_t
   52 __ashldi3(a, shift)
   53         quad_t a;
   54         qshift_t shift;
   55 {
   56         union uu aa;
   57 
   58         if (shift == 0)
   59                 return(a);
   60         aa.q = a;
   61         if (shift >= INT_BITS) {
   62                 aa.ul[H] = aa.ul[L] << (shift - INT_BITS);
   63                 aa.ul[L] = 0;
   64         } else {
   65                 aa.ul[H] = (aa.ul[H] << shift) |
   66                     (aa.ul[L] >> (INT_BITS - shift));
   67                 aa.ul[L] <<= shift;
   68         }
   69         return (aa.q);
   70 }

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