fixunsdfsi.S revision 1.1
1 /* $NetBSD: fixunsdfsi.S,v 1.1 1998/09/11 04:56:22 eeh 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * from: Header: fixunsdfsi.s,v 1.3 91/10/08 00:03:15 torek Exp 40 */ 41 42 #include <machine/asm.h> 43 #if defined(LIBC_SCCS) && !defined(lint) 44 #if 0 45 .asciz "@(#)fixunsdfsi.s 8.1 (Berkeley) 6/4/93" 46 #else 47 RCSID("$NetBSD: fixunsdfsi.S,v 1.1 1998/09/11 04:56:22 eeh Exp $") 48 #endif 49 #endif /* LIBC_SCCS and not lint */ 50 51 /* 52 * Convert double to unsigned integer (for gcc). 53 * 54 * I have made the output for NaN agree with the Sun compiler, not 55 * that it really matters, by using `fbul,a'. 56 */ 57 58 59 .align 8 60 Lbig: 61 .word 0x41e00000 ! .double 0r2147483648.0e+00 62 .word 0 ! (who me, not trust the assembler?) 63 64 ENTRY(__fixunsdfsi) 65 sub %sp, 8, %sp 66 stx %o0, [%sp + 64 + BIAS] ! get argument into fpu reg 67 ldd [%sp + 64 + BIAS], %f0 68 #ifdef PIC 69 PICCY_SET(Lbig, %g1, %o0) 70 ldd [%g1], %f2 71 #else 72 sethi %hi(Lbig), %g1 73 ldd [%g1 + %lo(Lbig)], %f2 74 #endif 75 fcmped %f0, %f2 ! d < 2^31, or NaN, or -Inf? 76 nop ! (fpop2 delay) 77 fbul,a 1f ! if so, use fdtoi to convert to int 78 fdtoi %f0, %f0 ! (this includes negatives!) 79 80 ! d does not fit in an int, so subtract 2^31, convert, 81 ! and add 2^31 again (sigh). Just hope the intermediate 82 ! fits (if not, the result is undefined anyway). 83 84 fsubd %f0, %f2, %f0 ! d -= 2^31 85 fdtoi %f0, %f0 ! convert to int 86 st %f0, [%sp + 64 + BIAS] ! move into return reg 87 ld [%sp + 64 + BIAS], %o0 88 sethi %hi(0x80000000), %o1 89 add %o0, %o1, %o0 ! add 2^31 90 retl 91 add %sp, 8, %sp 92 93 1: 94 st %f0, [%sp + 64 + BIAS] ! return result 95 ld [%sp + 64 + BIAS], %o0 96 retl 97 add %sp, 8, %sp 98
Indexes created Mon Sep 29 21:09:56 GMT 2025