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lshldi3.c revision 1.4 
      1 /*	$NetBSD: lshldi3.c,v 1.4 2012/12/07 15:41:02 christos 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[] = "@(#)lshldi3.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: lshldi3.c,v 1.4 2012/12/07 15:41:02 christos Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include "quad.h"
     46 
     47 ARM_EABI_ALIAS(__aeabi_llsl, __lshldi3)	/* no semicolon */
     48 
     49 /*
     50  * Shift an (unsigned) quad value left (logical shift left).
     51  * This is the same as arithmetic shift left!
     52  */
     53 quad_t
     54 __lshldi3(quad_t a, 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] << (unsigned int)(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 }
     71