fixunsdfsi.S revision 1.4
1 1.4 christos /* $NetBSD: fixunsdfsi.S,v 1.4 1997/07/16 14:37:40 christos Exp $ */ 2 1.4 christos 3 1.1 cgd /* 4 1.1 cgd * Copyright (c) 1992, 1993 5 1.1 cgd * The Regents of the University of California. All rights reserved. 6 1.1 cgd * 7 1.1 cgd * This software was developed by the Computer Systems Engineering group 8 1.1 cgd * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 1.1 cgd * contributed to Berkeley. 10 1.1 cgd * 11 1.1 cgd * Redistribution and use in source and binary forms, with or without 12 1.1 cgd * modification, are permitted provided that the following conditions 13 1.1 cgd * are met: 14 1.1 cgd * 1. Redistributions of source code must retain the above copyright 15 1.1 cgd * notice, this list of conditions and the following disclaimer. 16 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright 17 1.1 cgd * notice, this list of conditions and the following disclaimer in the 18 1.1 cgd * documentation and/or other materials provided with the distribution. 19 1.1 cgd * 3. All advertising materials mentioning features or use of this software 20 1.1 cgd * must display the following acknowledgement: 21 1.1 cgd * This product includes software developed by the University of 22 1.1 cgd * California, Berkeley and its contributors. 23 1.1 cgd * 4. Neither the name of the University nor the names of its contributors 24 1.1 cgd * may be used to endorse or promote products derived from this software 25 1.1 cgd * without specific prior written permission. 26 1.1 cgd * 27 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 1.1 cgd * SUCH DAMAGE. 38 1.1 cgd * 39 1.1 cgd * from: Header: fixunsdfsi.s,v 1.3 91/10/08 00:03:15 torek Exp 40 1.1 cgd */ 41 1.1 cgd 42 1.4 christos #include <machine/asm.h> 43 1.1 cgd #if defined(LIBC_SCCS) && !defined(lint) 44 1.4 christos #if 0 45 1.1 cgd .asciz "@(#)fixunsdfsi.s 8.1 (Berkeley) 6/4/93" 46 1.4 christos #else 47 1.4 christos RCSID("$NetBSD: fixunsdfsi.S,v 1.4 1997/07/16 14:37:40 christos Exp $") 48 1.4 christos #endif 49 1.1 cgd #endif /* LIBC_SCCS and not lint */ 50 1.1 cgd 51 1.1 cgd /* 52 1.1 cgd * Convert double to unsigned integer (for gcc). 53 1.1 cgd * 54 1.1 cgd * I have made the output for NaN agree with the Sun compiler, not 55 1.1 cgd * that it really matters, by using `fbul,a'. 56 1.1 cgd */ 57 1.1 cgd 58 1.1 cgd 59 1.1 cgd .align 8 60 1.1 cgd Lbig: 61 1.1 cgd .word 0x41e00000 ! .double 0r2147483648.0e+00 62 1.1 cgd .word 0 ! (who me, not trust the assembler?) 63 1.1 cgd 64 1.1 cgd ENTRY(__fixunsdfsi) 65 1.1 cgd sub %sp, 8, %sp 66 1.1 cgd std %o0, [%sp + 64] ! get argument into fpu reg 67 1.1 cgd ldd [%sp + 64], %f0 68 1.2 pk #ifdef PIC 69 1.2 pk PICCY_SET(Lbig, %g1, %o0) 70 1.2 pk ldd [%g1], %f2 71 1.2 pk #else 72 1.1 cgd sethi %hi(Lbig), %g1 73 1.1 cgd ldd [%g1 + %lo(Lbig)], %f2 74 1.2 pk #endif 75 1.1 cgd fcmped %f0, %f2 ! d < 2^31, or NaN, or -Inf? 76 1.1 cgd nop ! (fpop2 delay) 77 1.1 cgd fbul,a 1f ! if so, use fdtoi to convert to int 78 1.1 cgd fdtoi %f0, %f0 ! (this includes negatives!) 79 1.1 cgd 80 1.1 cgd ! d does not fit in an int, so subtract 2^31, convert, 81 1.1 cgd ! and add 2^31 again (sigh). Just hope the intermediate 82 1.1 cgd ! fits (if not, the result is undefined anyway). 83 1.1 cgd 84 1.1 cgd fsubd %f0, %f2, %f0 ! d -= 2^31 85 1.1 cgd fdtoi %f0, %f0 ! convert to int 86 1.1 cgd st %f0, [%sp + 64] ! move into return reg 87 1.1 cgd ld [%sp + 64], %o0 88 1.1 cgd sethi %hi(0x80000000), %o1 89 1.1 cgd add %o0, %o1, %o0 ! add 2^31 90 1.1 cgd retl 91 1.1 cgd add %sp, 8, %sp 92 1.1 cgd 93 1.1 cgd 1: 94 1.1 cgd st %f0, [%sp + 64] ! return result 95 1.1 cgd ld [%sp + 64], %o0 96 1.1 cgd retl 97 1.1 cgd add %sp, 8, %sp 98
Indexes created Tue Sep 30 20:09:53 GMT 2025