2 * ====================================================
3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 * Developed at SunPro, a Sun Microsystems, Inc. business.
6 * Permission to use, copy, modify, and distribute this
7 * software is freely granted, provided that this notice
9 * ====================================================
13 * from: @(#)fdlibm.h 5.1 93/09/24
14 * $FreeBSD: src/lib/msun/src/math_private.h,v 1.6 1999/08/28 00:06:43 peter Exp $
15 * $DragonFly: src/lib/msun/src/Attic/math_private.h,v 1.4 2004/12/29 17:29:35 asmodai Exp $
18 #ifndef _MATH_PRIVATE_H_
19 #define _MATH_PRIVATE_H_
21 #include <machine/endian.h>
22 #include <sys/types.h>
24 /* The original fdlibm code used statements like:
25 n0 = ((*(int*)&one)>>29)^1; * index of high word *
26 ix0 = *(n0+(int*)&x); * high word of x *
27 ix1 = *((1-n0)+(int*)&x); * low word of x *
28 to dig two 32 bit words out of the 64 bit IEEE floating point
29 value. That is non-ANSI, and, moreover, the gcc instruction
30 scheduler gets it wrong. We instead use the following macros.
31 Unlike the original code, we determine the endianness at compile
32 time, not at run time; I don't see much benefit to selecting
33 endianness at run time. */
35 /* A union which permits us to convert between a double and two 32 bit
38 #if BYTE_ORDER == BIG_ENDIAN
48 } ieee_double_shape_type;
52 #if BYTE_ORDER == LITTLE_ENDIAN
62 } ieee_double_shape_type;
66 /* Get two 32 bit ints from a double. */
68 #define EXTRACT_WORDS(ix0,ix1,d) \
70 ieee_double_shape_type ew_u; \
72 (ix0) = ew_u.parts.msw; \
73 (ix1) = ew_u.parts.lsw; \
76 /* Get the more significant 32 bit int from a double. */
78 #define GET_HIGH_WORD(i,d) \
80 ieee_double_shape_type gh_u; \
82 (i) = gh_u.parts.msw; \
85 /* Get the less significant 32 bit int from a double. */
87 #define GET_LOW_WORD(i,d) \
89 ieee_double_shape_type gl_u; \
91 (i) = gl_u.parts.lsw; \
94 /* Set a double from two 32 bit ints. */
96 #define INSERT_WORDS(d,ix0,ix1) \
98 ieee_double_shape_type iw_u; \
99 iw_u.parts.msw = (ix0); \
100 iw_u.parts.lsw = (ix1); \
104 /* Set the more significant 32 bits of a double from an int. */
106 #define SET_HIGH_WORD(d,v) \
108 ieee_double_shape_type sh_u; \
110 sh_u.parts.msw = (v); \
114 /* Set the less significant 32 bits of a double from an int. */
116 #define SET_LOW_WORD(d,v) \
118 ieee_double_shape_type sl_u; \
120 sl_u.parts.lsw = (v); \
124 /* A union which permits us to convert between a float and a 32 bit
130 /* FIXME: Assumes 32 bit int. */
132 } ieee_float_shape_type;
134 /* Get a 32 bit int from a float. */
136 #define GET_FLOAT_WORD(i,d) \
138 ieee_float_shape_type gf_u; \
143 /* Set a float from a 32 bit int. */
145 #define SET_FLOAT_WORD(d,i) \
147 ieee_float_shape_type sf_u; \
152 /* ieee style elementary functions */
153 extern double __ieee754_sqrt (double);
154 extern double __ieee754_acos (double);
155 extern double __ieee754_acosh (double);
156 extern double __ieee754_log (double);
157 extern double __ieee754_atanh (double);
158 extern double __ieee754_asin (double);
159 extern double __ieee754_atan2 (double,double);
160 extern double __ieee754_exp (double);
161 extern double __ieee754_cosh (double);
162 extern double __ieee754_fmod (double,double);
163 extern double __ieee754_pow (double,double);
164 extern double __ieee754_lgamma_r (double,int *);
165 extern double __ieee754_gamma_r (double,int *);
166 extern double __ieee754_lgamma (double);
167 extern double __ieee754_gamma (double);
168 extern double __ieee754_log10 (double);
169 extern double __ieee754_sinh (double);
170 extern double __ieee754_hypot (double,double);
171 extern double __ieee754_j0 (double);
172 extern double __ieee754_j1 (double);
173 extern double __ieee754_y0 (double);
174 extern double __ieee754_y1 (double);
175 extern double __ieee754_jn (int,double);
176 extern double __ieee754_yn (int,double);
177 extern double __ieee754_remainder (double,double);
178 extern int __ieee754_rem_pio2 (double,double*);
179 extern double __ieee754_scalb (double,double);
181 /* fdlibm kernel function */
182 extern double __kernel_standard (double,double,int);
183 extern double __kernel_sin (double,double,int);
184 extern double __kernel_cos (double,double);
185 extern double __kernel_tan (double,double,int);
186 extern int __kernel_rem_pio2 (double*,double*,int,int,int,const int*);
189 /* ieee style elementary float functions */
190 extern float __ieee754_sqrtf (float);
191 extern float __ieee754_acosf (float);
192 extern float __ieee754_acoshf (float);
193 extern float __ieee754_logf (float);
194 extern float __ieee754_atanhf (float);
195 extern float __ieee754_asinf (float);
196 extern float __ieee754_atan2f (float,float);
197 extern float __ieee754_expf (float);
198 extern float __ieee754_coshf (float);
199 extern float __ieee754_fmodf (float,float);
200 extern float __ieee754_powf (float,float);
201 extern float __ieee754_lgammaf_r (float,int *);
202 extern float __ieee754_gammaf_r (float,int *);
203 extern float __ieee754_lgammaf (float);
204 extern float __ieee754_gammaf (float);
205 extern float __ieee754_log10f (float);
206 extern float __ieee754_sinhf (float);
207 extern float __ieee754_hypotf (float,float);
208 extern float __ieee754_j0f (float);
209 extern float __ieee754_j1f (float);
210 extern float __ieee754_y0f (float);
211 extern float __ieee754_y1f (float);
212 extern float __ieee754_jnf (int,float);
213 extern float __ieee754_ynf (int,float);
214 extern float __ieee754_remainderf (float,float);
215 extern int __ieee754_rem_pio2f (float,float*);
216 extern float __ieee754_scalbf (float,float);
218 /* float versions of fdlibm kernel functions */
219 extern float __kernel_sinf (float,float,int);
220 extern float __kernel_cosf (float,float);
221 extern float __kernel_tanf (float,float,int);
222 extern int __kernel_rem_pio2f (float*,float*,int,int,int,const int*);
224 #endif /* _MATH_PRIVATE_H_ */