1 /* $NetBSD: fixunsdfsi.S,v 1.5 2003/08/07 16:42:23 agc Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
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.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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
35 * from: Header: fixunsdfsi.s,v 1.3 91/10/08 00:03:15 torek Exp
38 #include <machine/asm.h>
39 #if defined(LIBC_SCCS) && !defined(lint)
41 .asciz "@(#)fixunsdfsi.s 8.1 (Berkeley) 6/4/93"
43 RCSID("$NetBSD: fixunsdfsi.S,v 1.5 2003/08/07 16:42:23 agc Exp $")
45 #endif /* LIBC_SCCS and not lint */
48 * Convert double to unsigned integer (for gcc).
50 * I have made the output for NaN agree with the Sun compiler, not
51 * that it really matters, by using `fbul,a'.
57 .word 0x41e00000 ! .double 0r2147483648.0e+00
58 .word 0 ! (who me, not trust the assembler?)
62 std %o0, [%sp + 64] ! get argument into fpu reg
65 PICCY_SET(Lbig, %g1, %o0)
69 ldd [%g1 + %lo(Lbig)], %f2
71 fcmped %f0, %f2 ! d < 2^31, or NaN, or -Inf?
73 fbul,a 1f ! if so, use fdtoi to convert to int
74 fdtoi %f0, %f0 ! (this includes negatives!)
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).
80 fsubd %f0, %f2, %f0 ! d -= 2^31
81 fdtoi %f0, %f0 ! convert to int
82 st %f0, [%sp + 64] ! move into return reg
84 sethi %hi(0x80000000), %o1
85 add %o0, %o1, %o0 ! add 2^31
90 st %f0, [%sp + 64] ! return result