fixunsdfsi.S revision 1.5.62.1
1 /* $NetBSD: fixunsdfsi.S,v 1.5.62.1 2014/08/20 00:02:12 tls 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. 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. 22 * 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 33 * SUCH DAMAGE. 34 * 35 * from: Header: fixunsdfsi.s,v 1.3 91/10/08 00:03:15 torek Exp 36 */ 37 38 #include <machine/asm.h> 39 #if defined(LIBC_SCCS) && !defined(lint) 40 #if 0 41 .asciz "@(#)fixunsdfsi.s 8.1 (Berkeley) 6/4/93" 42 #else 43 RCSID("$NetBSD: fixunsdfsi.S,v 1.5.62.1 2014/08/20 00:02:12 tls Exp $") 44 #endif 45 #endif /* LIBC_SCCS and not lint */ 46 47 /* 48 * Convert double to unsigned integer (for gcc). 49 * 50 * I have made the output for NaN agree with the Sun compiler, not 51 * that it really matters, by using `fbul,a'. 52 */ 53 54 55 .align 8 56 Lbig: 57 .word 0x41e00000 ! .double 0r2147483648.0e+00 58 .word 0 ! (who me, not trust the assembler?) 59 60 ENTRY(__fixunsdfsi) 61 sub %sp, 8, %sp 62 std %o0, [%sp + 64] ! get argument into fpu reg 63 ldd [%sp + 64], %f0 64 #ifdef __PIC__ 65 PICCY_SET(Lbig, %g1, %o0) 66 ldd [%g1], %f2 67 #else 68 sethi %hi(Lbig), %g1 69 ldd [%g1 + %lo(Lbig)], %f2 70 #endif 71 fcmped %f0, %f2 ! d < 2^31, or NaN, or -Inf? 72 nop ! (fpop2 delay) 73 fbul,a 1f ! if so, use fdtoi to convert to int 74 fdtoi %f0, %f0 ! (this includes negatives!) 75 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). 79 80 fsubd %f0, %f2, %f0 ! d -= 2^31 81 fdtoi %f0, %f0 ! convert to int 82 st %f0, [%sp + 64] ! move into return reg 83 ld [%sp + 64], %o0 84 sethi %hi(0x80000000), %o1 85 add %o0, %o1, %o0 ! add 2^31 86 retl 87 add %sp, 8, %sp 88 89 1: 90 st %f0, [%sp + 64] ! return result 91 ld [%sp + 64], %o0 92 retl 93 add %sp, 8, %sp 94
Indexes created Tue Sep 30 20:09:53 GMT 2025