1/* $NetBSD: n_sincos.S,v 1.5 2002/02/24 01:06:21 matt Exp $ */ 2/* 3 * Copyright (c) 1985, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)sincos.s 8.1 (Berkeley) 6/4/93 35 */ 36 37/* 38 * This is the implementation of Peter Tang's double precision 39 * sine and cosine for the VAX using Bob Corbett's argument reduction. 40 * 41 * Notes: 42 * under 1,024,000 random arguments testing on [0,2*pi] 43 * sin() observed maximum error = 0.814 ulps 44 * cos() observed maximum error = 0.792 ulps 45 * 46 * double sin(arg) 47 * double arg; 48 * method: true range reduction to [-pi/4,pi/4], P. Tang & B. Corbett 49 * S. McDonald, April 4, 1985 50 */ 51#include <machine/asm.h> 52 53ENTRY(sin, 0xfc0) 54 movq 4(%ap),%r0 55 bicw3 $0x807f,%r0,%r2 56 beql 1f # if x is zero or reserved operand then return x 57/* 58 * Save the PSL's IV & FU bits on the stack. 59 */ 60 movpsl %r2 61 bicw3 $0xff9f,%r2,-(%sp) 62/* 63 * Clear the IV & FU bits. 64 */ 65 bicpsw $0x0060 66/* 67 * Entered by sine ; save 0 in %r4 . 68 */ 69 jsb _C_LABEL(__libm_argred)+2 70 movl $0,%r4 71 jsb _C_LABEL(__libm_sincos)+2 72 bispsw (%sp)+ 731: ret 74 75/* 76 * double cos(arg) 77 * double arg; 78 * method: true range reduction to [-pi/4,pi/4], P. Tang & B. Corbett 79 * S. McDonald, April 4, 1985 80 */ 81 82ENTRY(cos, 0x0fc0) 83 movq 4(%ap),%r0 84 bicw3 $0x7f,%r0,%r2 85 cmpw $0x8000,%r2 86 beql 1f # if x is reserved operand then return x 87/* 88 * Save the PSL's IV & FU bits on the stack. 89 */ 90 movpsl %r2 91 bicw3 $0xff9f,%r2,-(%sp) 92/* 93 * Clear the IV & FU bits. 94 */ 95 bicpsw $0x0060 96/* 97 * Entered by cosine ; save 1 in %r4 . 98 */ 99 jsb _C_LABEL(__libm_argred)+2 100 movl $1,%r4 101 jsb _C_LABEL(__libm_sincos)+2 102 bispsw (%sp)+ 1031: ret 104