ashldi3.c revision 1.1.36.1
1/* $NetBSD: ashldi3.c,v 1.1.36.1 2009/05/13 17:23:11 jym 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 39static char sccsid[] = "@(#)ashldi3.c 8.1 (Berkeley) 6/4/93"; 40#else 41__RCSID("$NetBSD: ashldi3.c,v 1.1.36.1 2009/05/13 17:23:11 jym 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 */ 51quad_t 52__ashldi3(quad_t a, qshift_t shift) 53{ 54 union uu aa; 55 56 if (shift == 0) 57 return(a); 58 aa.q = a; 59 if (shift >= INT_BITS) { 60 aa.ul[H] = aa.ul[L] << (shift - INT_BITS); 61 aa.ul[L] = 0; 62 } else { 63 aa.ul[H] = (aa.ul[H] << shift) | 64 (aa.ul[L] >> (INT_BITS - shift)); 65 aa.ul[L] <<= shift; 66 } 67 return (aa.q); 68} 69