1 /* $NetBSD: n_sincos.S,v 1.9 2014/10/10 22:06:33 martin 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)
56 WEAK_ALIAS(_sinl, sin)
62 beql 1f # if x is zero or reserved operand then return x
64 * Save the PSL's IV & FU bits on the stack.
67 bicw3 $0xff9f,%r2,-(%sp)
69 * Clear the IV & FU bits.
73 * Entered by sine ; save 0 in %r4 .
75 jsb _C_LABEL(__libm_argred)+2
77 jsb _C_LABEL(__libm_sincos)+2
84 * method: true range reduction to [-pi/4,pi/4], P. Tang & B. Corbett
85 * S. McDonald, April 4, 1985
90 calls $2,_C_LABEL(cos)
95 WEAK_ALIAS(_cosl, cos)
102 beql 1f # if x is reserved operand then return x
104 * Save the PSL's IV & FU bits on the stack.
107 bicw3 $0xff9f,%r2,-(%sp)
109 * Clear the IV & FU bits.
113 * Entered by cosine ; save 1 in %r4 .
115 jsb _C_LABEL(__libm_argred)+2
117 jsb _C_LABEL(__libm_sincos)+2