fixunsdfsi.S revision 1.2
1 /* $NetBSD: fixunsdfsi.S,v 1.2 1999/04/04 21:01:39 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 #define _LOCORE 44 #include <machine/frame.h> 45 #if defined(LIBC_SCCS) && !defined(lint) 46 #if 0 47 .asciz "@(#)fixunsdfsi.s 8.1 (Berkeley) 6/4/93" 48 #else 49 RCSID("$NetBSD: fixunsdfsi.S,v 1.2 1999/04/04 21:01:39 eeh Exp $") 50 #endif 51 #endif /* LIBC_SCCS and not lint */ 52 53 /* 54 * Convert double to unsigned integer (for gcc). 55 * 56 * I have made the output for NaN agree with the Sun compiler, not 57 * that it really matters, by using `fbul,a'. 58 */ 59 60 61 .align 8 62 Lbig: 63 .word 0x41e00000 ! .double 0r2147483648.0e+00 64 .word 0 ! (who me, not trust the assembler?) 65 66 ENTRY(__fixunsdfsi) 67 sub %sp, 8, %sp 68 stx %o0, [%sp + 64 + BIAS] ! get argument into fpu reg 69 ldd [%sp + 64 + BIAS], %f0 70 #ifdef PIC 71 PICCY_SET(Lbig, %g1, %o0) 72 ldd [%g1], %f2 73 #else 74 sethi %hi(Lbig), %g1 75 ldd [%g1 + %lo(Lbig)], %f2 76 #endif 77 fcmped %f0, %f2 ! d < 2^31, or NaN, or -Inf? 78 nop ! (fpop2 delay) 79 fbul,a 1f ! if so, use fdtoi to convert to int 80 fdtoi %f0, %f0 ! (this includes negatives!) 81 82 ! d does not fit in an int, so subtract 2^31, convert, 83 ! and add 2^31 again (sigh). Just hope the intermediate 84 ! fits (if not, the result is undefined anyway). 85 86 fsubd %f0, %f2, %f0 ! d -= 2^31 87 fdtoi %f0, %f0 ! convert to int 88 st %f0, [%sp + 64 + BIAS] ! move into return reg 89 ld [%sp + 64 + BIAS], %o0 90 sethi %hi(0x80000000), %o1 91 add %o0, %o1, %o0 ! add 2^31 92 retl 93 add %sp, 8, %sp 94 95 1: 96 st %f0, [%sp + 64 + BIAS] ! return result 97 ld [%sp + 64 + BIAS], %o0 98 retl 99 add %sp, 8, %sp 100 101 /* 102 * Same as above but to unsigned long 103 */ 104 ENTRY(__dtoul) 105 sub %sp, 8, %sp 106 stx %o0, [%sp + 64 + BIAS] ! get argument into fpu reg 107 ldd [%sp + 64 + BIAS], %f0 108 #ifdef PIC 109 PICCY_SET(Lbig, %g1, %o0) 110 ldd [%g1], %f2 111 #else 112 sethi %hi(Lbig), %g1 113 ldd [%g1 + %lo(Lbig)], %f2 114 #endif 115 fcmped %f0, %f2 ! d < 2^31, or NaN, or -Inf? 116 nop ! (fpop2 delay) 117 fbul,a 1f ! if so, use fdtoi to convert to int 118 fdtox %f0, %f0 ! (this includes negatives!) 119 120 ! d does not fit in an int, so subtract 2^31, convert, 121 ! and add 2^31 again (sigh). Just hope the intermediate 122 ! fits (if not, the result is undefined anyway). 123 124 fsubd %f0, %f2, %f0 ! d -= 2^31 125 fdtox %f0, %f0 ! convert to int 126 std %f0, [%sp + 64 + BIAS] ! move into return reg 127 ldx [%sp + 64 + BIAS], %o0 128 sethi %hi(0x80000000), %o1 129 add %o0, %o1, %o0 ! add 2^31 130 retl 131 add %sp, 8, %sp 132 133 1: 134 std %f0, [%sp + 64 + BIAS] ! return result 135 ldx [%sp + 64 + BIAS], %o0 136 retl 137 add %sp, 8, %sp 138
Indexes created Sun Sep 28 07:09:56 GMT 2025