1 /* $NetBSD: n_sincos.S,v 1.7 2003/02/21 06:40:47 matt Exp $ */
3 * Copyright (c) 1985, 1993
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30 * @(#)sincos.s 8.1 (Berkeley) 6/4/93
34 * This is the implementation of Peter Tang's double precision
35 * sine and cosine for the VAX using Bob Corbett's argument reduction.
38 * under 1,024,000 random arguments testing on [0,2*pi]
39 * sin() observed maximum error = 0.814 ulps
40 * cos() observed maximum error = 0.792 ulps
44 * method: true range reduction to [-pi/4,pi/4], P. Tang & B. Corbett
45 * S. McDonald, April 4, 1985
47 #include <machine/asm.h>
51 calls $2,_C_LABEL(sin)
58 beql 1f # if x is zero or reserved operand then return x
60 * Save the PSL's IV & FU bits on the stack.
63 bicw3 $0xff9f,%r2,-(%sp)
65 * Clear the IV & FU bits.
69 * Entered by sine ; save 0 in %r4 .
71 jsb _C_LABEL(__libm_argred)+2
73 jsb _C_LABEL(__libm_sincos)+2
80 * method: true range reduction to [-pi/4,pi/4], P. Tang & B. Corbett
81 * S. McDonald, April 4, 1985
86 calls $2,_C_LABEL(cos)
94 beql 1f # if x is reserved operand then return x
96 * Save the PSL's IV & FU bits on the stack.
99 bicw3 $0xff9f,%r2,-(%sp)
101 * Clear the IV & FU bits.
105 * Entered by cosine ; save 1 in %r4 .
107 jsb _C_LABEL(__libm_argred)+2
109 jsb _C_LABEL(__libm_sincos)+2