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/* $NetBSD: n_sincos.S,v 1.1 1995/10/10 23:40:28 ragge Exp $ */
/*
* Copyright (c) 1985, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)sincos.s 8.1 (Berkeley) 6/4/93
*/
/*
* This is the implementation of Peter Tang's double precision
* sine and cosine for the VAX using Bob Corbett's argument reduction.
*
* Notes:
* under 1,024,000 random arguments testing on [0,2*pi]
* sin() observed maximum error = 0.814 ulps
* cos() observed maximum error = 0.792 ulps
*
* double sin(arg)
* double arg;
* method: true range reduction to [-pi/4,pi/4], P. Tang & B. Corbett
* S. McDonald, April 4, 1985
*/
.globl _sin
.text
.align 1
_sin: .word 0xffc # save r2-r11
movq 4(ap),r0
bicw3 $0x807f,r0,r2
beql 1f # if x is zero or reserved operand then return x
/*
* Save the PSL's IV & FU bits on the stack.
*/
movpsl r2
bicw3 $0xff9f,r2,-(sp)
/*
* Clear the IV & FU bits.
*/
bicpsw $0x0060
/*
* Entered by sine ; save 0 in r4 .
*/
jsb libm$argred
movl $0,r4
jsb libm$sincos
bispsw (sp)+
1: ret
/*
* double cos(arg)
* double arg;
* method: true range reduction to [-pi/4,pi/4], P. Tang & B. Corbett
* S. McDonald, April 4, 1985
*/
.globl _cos
.text
.align 1
_cos: .word 0xffc # save r2-r11
movq 4(ap),r0
bicw3 $0x7f,r0,r2
cmpw $0x8000,r2
beql 1f # if x is reserved operand then return x
/*
* Save the PSL's IV & FU bits on the stack.
*/
movpsl r2
bicw3 $0xff9f,r2,-(sp)
/*
* Clear the IV & FU bits.
*/
bicpsw $0x0060
/*
* Entered by cosine ; save 1 in r4 .
*/
jsb libm$argred
movl $1,r4
jsb libm$sincos
bispsw (sp)+
1: ret
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