compilers/pcc/pcc-libs-1.0.0/libpcc/ashldi3.c

   1 /*      $Id: ashldi3.c,v 1.3 2009/03/15 00:20:41 gmcgarry Exp $ */
   2 /*      $NetBSD: ashldi3.c,v 1.1 2005/12/20 19:28:51 christos Exp $     */
   3
   4 /*-
   5  * Copyright (c) 1992, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This software was developed by the Computer Systems Engineering group
   9  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  10  * contributed to Berkeley.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #include "quad.h"
  38
  39 /*
  40  * Shift a (signed) quad value left (arithmetic shift left).
  41  * This is the same as logical shift left!
  42  */
  43 quad_t
  44 __ashldi3(quad_t a, qshift_t shift)
  45 {
  46         union uu aa;
  47
  48         if (shift == 0)
  49                 return(a);
  50         aa.q = a;
  51         if (shift >= INT_BITS) {
  52                 aa.ul[H] = aa.ul[L] << (shift - INT_BITS);
  53                 aa.ul[L] = 0;
  54         } else {
  55                 aa.ul[H] = (aa.ul[H] << shift) |
  56                     (aa.ul[L] >> (INT_BITS - shift));
  57                 aa.ul[L] <<= shift;
  58         }
  59         return (aa.q);
  60 }