diff options
Diffstat (limited to 'sys/lib/libkern/lshldi3.c')
| -rw-r--r-- | sys/lib/libkern/lshldi3.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/sys/lib/libkern/lshldi3.c b/sys/lib/libkern/lshldi3.c new file mode 100644 index 00000000000..d8a085257d6 --- /dev/null +++ b/sys/lib/libkern/lshldi3.c @@ -0,0 +1,72 @@ +/* $NetBSD: lshldi3.c,v 1.5 1995/10/07 09:26:29 mycroft Exp $ */ + +/*- + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This software was developed by the Computer Systems Engineering group + * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and + * contributed to Berkeley. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +#if 0 +static char sccsid[] = "@(#)lshldi3.c 8.1 (Berkeley) 6/4/93"; +#else +static char rcsid[] = "$NetBSD: lshldi3.c,v 1.5 1995/10/07 09:26:29 mycroft Exp $"; +#endif +#endif /* LIBC_SCCS and not lint */ + +#include "quad.h" + +/* + * Shift an (unsigned) quad value left (logical shift left). + * This is the same as arithmetic shift left! + */ +quad_t +__lshldi3(a, shift) + quad_t a; + qshift_t shift; +{ + union uu aa; + + aa.q = a; + if (shift >= LONG_BITS) { + aa.ul[H] = shift >= QUAD_BITS ? 0 : + aa.ul[L] << (shift - LONG_BITS); + aa.ul[L] = 0; + } else if (shift > 0) { + aa.ul[H] = (aa.ul[H] << shift) | + (aa.ul[L] >> (LONG_BITS - shift)); + aa.ul[L] <<= shift; + } + return (aa.q); +} |