diff options
Diffstat (limited to 'src/VBox/Runtime/common/math/gcc/ashrdi3.c')
| -rw-r--r-- | src/VBox/Runtime/common/math/gcc/ashrdi3.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/math/gcc/ashrdi3.c b/src/VBox/Runtime/common/math/gcc/ashrdi3.c new file mode 100644 index 00000000..aaa1c71b --- /dev/null +++ b/src/VBox/Runtime/common/math/gcc/ashrdi3.c @@ -0,0 +1,82 @@ +/* $NetBSD: ashrdi3.c,v 1.10 2005/12/11 12:24:37 christos 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. 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. + */ + +/*#include <sys/cdefs.h> +#if defined(LIBC_SCCS) && !defined(lint) +#if 0 +static char sccsid[] = "@(#)ashrdi3.c 8.1 (Berkeley) 6/4/93"; +#else +__RCSID("$NetBSD: ashrdi3.c,v 1.10 2005/12/11 12:24:37 christos Exp $"); +#endif +#endif*/ /* LIBC_SCCS and not lint */ + +#include "quad.h" + +/* + * Shift a (signed) quad value right (arithmetic shift right). + */ +quad_t +__ashrdi3(a, shift) + quad_t a; + qshift_t shift; +{ + union uu aa; + + if (shift == 0) + return(a); + aa.q = a; + if (shift >= INT_BITS) { + int s; + + /* + * Smear bits rightward using the machine's right-shift + * method, whether that is sign extension or zero fill, + * to get the `sign word' s. Note that shifting by + * INT_BITS is undefined, so we shift (INT_BITS-1), + * then 1 more, to get our answer. + */ + /* LINTED inherits machine dependency */ + s = (aa.sl[H] >> (INT_BITS - 1)) >> 1; + /* LINTED inherits machine dependency*/ + aa.ul[L] = aa.sl[H] >> (shift - INT_BITS); + aa.ul[H] = s; + } else { + aa.ul[L] = (aa.ul[L] >> shift) | + (aa.ul[H] << (INT_BITS - shift)); + /* LINTED inherits machine dependency */ + aa.sl[H] >>= shift; + } + return (aa.q); +} |