1 /* $NetBSD: ashldi3.c,v 1.5 1995/10/07 09:26:17 mycroft 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)ashldi3.c 8.1 (Berkeley) 6/4/93"; 43 #else 44 static char rcsid[] = "$NetBSD: ashldi3.c,v 1.5 1995/10/07 09:26:17 mycroft Exp $"; 45 #endif 46 #endif /* LIBC_SCCS and not lint */ 47 48 #include "quad.h" 49 50 /* 51 * Shift a (signed) quad value left (arithmetic shift left). 52 * This is the same as logical shift left! 53 */ 54 quad_t 55 __ashldi3(a, shift) 56 quad_t a; 57 qshift_t shift; 58 { 59 union uu aa; 60 61 aa.q = a; 62 if (shift >= LONG_BITS) { 63 aa.ul[H] = shift >= QUAD_BITS ? 0 : 64 aa.ul[L] << (shift - LONG_BITS); 65 aa.ul[L] = 0; 66 } else if (shift > 0) { 67 aa.ul[H] = (aa.ul[H] << shift) | 68 (aa.ul[L] >> (LONG_BITS - shift)); 69 aa.ul[L] <<= shift; 70 } 71 return (aa.q); 72 } 73