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