fixunsdfsi.S revision 1.2
1 /* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: Header: fixunsdfsi.s,v 1.3 91/10/08 00:03:15 torek Exp 38 * $Id: fixunsdfsi.S,v 1.2 1995/08/14 15:47:32 pk Exp $ 39 */ 40 41 #if defined(LIBC_SCCS) && !defined(lint) 42 .asciz "@(#)fixunsdfsi.s 8.1 (Berkeley) 6/4/93" 43 #endif /* LIBC_SCCS and not lint */ 44 45 /* 46 * Convert double to unsigned integer (for gcc). 47 * 48 * I have made the output for NaN agree with the Sun compiler, not 49 * that it really matters, by using `fbul,a'. 50 */ 51 52 #include "DEFS.h" 53 54 .align 8 55 Lbig: 56 .word 0x41e00000 ! .double 0r2147483648.0e+00 57 .word 0 ! (who me, not trust the assembler?) 58 59 ENTRY(__fixunsdfsi) 60 sub %sp, 8, %sp 61 std %o0, [%sp + 64] ! get argument into fpu reg 62 ldd [%sp + 64], %f0 63 #ifdef PIC 64 PICCY_SET(Lbig, %g1, %o0) 65 ldd [%g1], %f2 66 #else 67 sethi %hi(Lbig), %g1 68 ldd [%g1 + %lo(Lbig)], %f2 69 #endif 70 fcmped %f0, %f2 ! d < 2^31, or NaN, or -Inf? 71 nop ! (fpop2 delay) 72 fbul,a 1f ! if so, use fdtoi to convert to int 73 fdtoi %f0, %f0 ! (this includes negatives!) 74 75 ! d does not fit in an int, so subtract 2^31, convert, 76 ! and add 2^31 again (sigh). Just hope the intermediate 77 ! fits (if not, the result is undefined anyway). 78 79 fsubd %f0, %f2, %f0 ! d -= 2^31 80 fdtoi %f0, %f0 ! convert to int 81 st %f0, [%sp + 64] ! move into return reg 82 ld [%sp + 64], %o0 83 sethi %hi(0x80000000), %o1 84 add %o0, %o1, %o0 ! add 2^31 85 retl 86 add %sp, 8, %sp 87 88 1: 89 st %f0, [%sp + 64] ! return result 90 ld [%sp + 64], %o0 91 retl 92 add %sp, 8, %sp 93
Indexes created Tue Sep 30 20:09:53 GMT 2025