1/*	$NetBSD: fixunsdfsi.S,v 1.5 2003/08/07 16:42:23 agc 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 * from: Header: fixunsdfsi.s,v 1.3 91/10/08 00:03:15 torek Exp
36 */
37
38#include <machine/asm.h>
39#if defined(LIBC_SCCS) && !defined(lint)
40#if 0
41	.asciz "@(#)fixunsdfsi.s	8.1 (Berkeley) 6/4/93"
42#else
43	RCSID("$NetBSD: fixunsdfsi.S,v 1.5 2003/08/07 16:42:23 agc Exp $")
44#endif
45#endif /* LIBC_SCCS and not lint */
46
47/*
48 * Convert double to unsigned integer (for gcc).
49 *
50 * I have made the output for NaN agree with the Sun compiler, not
51 * that it really matters, by using `fbul,a'.
52 */
53
54
55	.align	8
56Lbig:
57	.word	0x41e00000		! .double 0r2147483648.0e+00
58	.word	0			! (who me, not trust the assembler?)
59
60ENTRY(__fixunsdfsi)
61	sub	%sp, 8, %sp
62	std	%o0, [%sp + 64]		! get argument into fpu reg
63	ldd	[%sp + 64], %f0
64#ifdef __PIC__
65	PICCY_SET(Lbig, %g1, %o0)
66	ldd	[%g1], %f2
67#else
68	sethi	%hi(Lbig), %g1
69	ldd	[%g1 + %lo(Lbig)], %f2
70#endif
71	fcmped	%f0, %f2		! d < 2^31, or NaN, or -Inf?
72	nop				! (fpop2 delay)
73	fbul,a	1f			! if so, use fdtoi to convert to int
74	fdtoi	%f0, %f0		!        (this includes negatives!)
75
76	! d does not fit in an int, so subtract 2^31, convert,
77	! and add 2^31 again (sigh).  Just hope the intermediate
78	! fits (if not, the result is undefined anyway).
79
80	fsubd	%f0, %f2, %f0		! d -= 2^31
81	fdtoi	%f0, %f0		! convert to int
82	st	%f0, [%sp + 64]		! move into return reg
83	ld	[%sp + 64], %o0
84	sethi	%hi(0x80000000), %o1
85	add	%o0, %o1, %o0		! add 2^31
86	retl
87	add	%sp, 8, %sp
88
891:
90	st	%f0, [%sp + 64]		! return result
91	ld	[%sp + 64], %o0
92	retl
93	add	%sp, 8, %sp
94