fixunsdfsi.S revision 99018 
1/*
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This software was developed by the Computer Systems Engineering group
6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
7 * contributed to Berkeley.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed by the University of
20 *	California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * from: Header: fixunsdfsi.s,v 1.3 91/10/08 00:03:15 torek Exp
38 */
39
40#include <machine/asm.h>
41
42#if defined(LIBC_SCCS) && !defined(lint)
43	.asciz "@(#)fixunsdfsi.s	8.1 (Berkeley) 6/4/93"
44#if 0
45	RCSID("$NetBSD: fixunsdfsi.S,v 1.3 2000/07/25 04:26:12 mycroft Exp $")
46#endif
47#endif /* LIBC_SCCS and not lint */
48__FBSDID("$FreeBSD: head/lib/libc/sparc64/gen/fixunsdfsi.S 99018 2002-06-29 03:23:51Z obrien $");
49
50/*
51 * Convert double to unsigned integer (for gcc).
52 *
53 * I have made the output for NaN agree with the Sun compiler, not
54 * that it really matters, by using `fbul,a'.
55 */
56
57
58	.align	8
59.Lbig:
60	.word	0x43e00000		! .double 2^63
61	.word	0			! (who me, not trust the assembler?)
62
63/*
64 * Same as above but to unsigned long
65 */
66ENTRY(__dtoul)
67	PIC_PROLOGUE(%o4, %o5)
68	sub	%sp, 16, %sp
69	std	%f2, [%sp + CCFSZ + SPOFF + 8]
70	SET(.Lbig, %o5, %o3)
71	ldd	[%o3], %f2
72	fcmped	%f0, %f2		! d < 2^63, or NaN, or -Inf?
73	fbul,a	1f			! if so, use fdtox to convert to long
74	 fdtox	%f0, %f0		!        (this includes negatives!)
75
76	! d does not fit in a long, so subtract 2^63, convert,
77	! and add 2^63 again (sigh).  Just hope the intermediate
78	! fits (if not, the result is undefined anyway).
79
80	fsubd	%f0, %f2, %f0		! d -= 2^63
81	fdtox	%f0, %f0		! convert to long
82	std	%f0, [%sp + CCFSZ + SPOFF]	! move into return reg
83	ldx	[%sp + CCFSZ + SPOFF], %o0
84	sethi	%hi(0x80000000), %o1
85	sllx	%o1, 32, %o1
86	add	%o0, %o1, %o0		! add 2^63
87	ldd	[%sp + CCFSZ + SPOFF + 8], %f2
88	retl
89	 add	%sp, 16, %sp
90
911:
92	std	%f0, [%sp + CCFSZ + SPOFF]	! return result
93	ldx	[%sp + CCFSZ + SPOFF], %o0
94	ldd	[%sp + CCFSZ + SPOFF + 8], %f2
95	retl
96	 add	%sp, 16, %sp
97END(__dtoul)
98