1/*
2 * ====================================================
3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
4 *
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
8 * is preserved.
9 * ====================================================
10 */
11
12/*
13 * from: @(#)fdlibm.h 5.1 93/09/24
14 * $Id: math_private.h,v 1.3 2004/02/09 07:10:38 andersen Exp $
15 */
16
17#ifndef _MATH_PRIVATE_H_
18#define _MATH_PRIVATE_H_
19
20/* #include <endian.h> */
21#include "SDL_endian.h"
22/* #include <sys/types.h> */
23
24#define _IEEE_LIBM
25#define attribute_hidden
26#define libm_hidden_proto(x)
27#define libm_hidden_def(x)
28#define strong_alias(x, y)
29
30#ifndef __HAIKU__ /* already defined in a system header. */
31typedef unsigned int u_int32_t;
32#endif
33
34#define atan SDL_uclibc_atan
35#define __ieee754_atan2 SDL_uclibc_atan2
36#define copysign SDL_uclibc_copysign
37#define cos SDL_uclibc_cos
38#define __ieee754_exp SDL_uclibc_exp
39#define fabs SDL_uclibc_fabs
40#define floor SDL_uclibc_floor
41#define __ieee754_fmod SDL_uclibc_fmod
42#define __ieee754_log SDL_uclibc_log
43#define __ieee754_log10 SDL_uclibc_log10
44#define __ieee754_pow SDL_uclibc_pow
45#define scalbln SDL_uclibc_scalbln
46#define scalbn SDL_uclibc_scalbn
47#define sin SDL_uclibc_sin
48#define __ieee754_sqrt SDL_uclibc_sqrt
49#define tan SDL_uclibc_tan
50
51/* The original fdlibm code used statements like:
52 n0 = ((*(int*)&one)>>29)^1; * index of high word *
53 ix0 = *(n0+(int*)&x); * high word of x *
54 ix1 = *((1-n0)+(int*)&x); * low word of x *
55 to dig two 32 bit words out of the 64 bit IEEE floating point
56 value. That is non-ANSI, and, moreover, the gcc instruction
57 scheduler gets it wrong. We instead use the following macros.
58 Unlike the original code, we determine the endianness at compile
59 time, not at run time; I don't see much benefit to selecting
60 endianness at run time. */
61
62/* A union which permits us to convert between a double and two 32 bit
63 ints. */
64
65/*
66 * Math on arm is special:
67 * For FPA, float words are always big-endian.
68 * For VFP, floats words follow the memory system mode.
69 */
70
71#if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
72
73typedef union
74{
75 double value;
76 struct
77 {
78 u_int32_t msw;
79 u_int32_t lsw;
80 } parts;
81} ieee_double_shape_type;
82
83#else
84
85typedef union
86{
87 double value;
88 struct
89 {
90 u_int32_t lsw;
91 u_int32_t msw;
92 } parts;
93} ieee_double_shape_type;
94
95#endif
96
97/* Get two 32 bit ints from a double. */
98
99#define EXTRACT_WORDS(ix0,ix1,d) \
100do { \
101 ieee_double_shape_type ew_u; \
102 ew_u.value = (d); \
103 (ix0) = ew_u.parts.msw; \
104 (ix1) = ew_u.parts.lsw; \
105} while (0)
106
107/* Get the more significant 32 bit int from a double. */
108
109#define GET_HIGH_WORD(i,d) \
110do { \
111 ieee_double_shape_type gh_u; \
112 gh_u.value = (d); \
113 (i) = gh_u.parts.msw; \
114} while (0)
115
116/* Get the less significant 32 bit int from a double. */
117
118#define GET_LOW_WORD(i,d) \
119do { \
120 ieee_double_shape_type gl_u; \
121 gl_u.value = (d); \
122 (i) = gl_u.parts.lsw; \
123} while (0)
124
125/* Set a double from two 32 bit ints. */
126
127#define INSERT_WORDS(d,ix0,ix1) \
128do { \
129 ieee_double_shape_type iw_u; \
130 iw_u.parts.msw = (ix0); \
131 iw_u.parts.lsw = (ix1); \
132 (d) = iw_u.value; \
133} while (0)
134
135/* Set the more significant 32 bits of a double from an int. */
136
137#define SET_HIGH_WORD(d,v) \
138do { \
139 ieee_double_shape_type sh_u; \
140 sh_u.value = (d); \
141 sh_u.parts.msw = (v); \
142 (d) = sh_u.value; \
143} while (0)
144
145/* Set the less significant 32 bits of a double from an int. */
146
147#define SET_LOW_WORD(d,v) \
148do { \
149 ieee_double_shape_type sl_u; \
150 sl_u.value = (d); \
151 sl_u.parts.lsw = (v); \
152 (d) = sl_u.value; \
153} while (0)
154
155/* A union which permits us to convert between a float and a 32 bit
156 int. */
157
158typedef union
159{
160 float value;
161 u_int32_t word;
162} ieee_float_shape_type;
163
164/* Get a 32 bit int from a float. */
165
166#define GET_FLOAT_WORD(i,d) \
167do { \
168 ieee_float_shape_type gf_u; \
169 gf_u.value = (d); \
170 (i) = gf_u.word; \
171} while (0)
172
173/* Set a float from a 32 bit int. */
174
175#define SET_FLOAT_WORD(d,i) \
176do { \
177 ieee_float_shape_type sf_u; \
178 sf_u.word = (i); \
179 (d) = sf_u.value; \
180} while (0)
181
182/* ieee style elementary functions */
183extern double
184__ieee754_sqrt(double)
185 attribute_hidden;
186 extern double __ieee754_acos(double) attribute_hidden;
187 extern double __ieee754_acosh(double) attribute_hidden;
188 extern double __ieee754_log(double) attribute_hidden;
189 extern double __ieee754_atanh(double) attribute_hidden;
190 extern double __ieee754_asin(double) attribute_hidden;
191 extern double __ieee754_atan2(double, double) attribute_hidden;
192 extern double __ieee754_exp(double) attribute_hidden;
193 extern double __ieee754_cosh(double) attribute_hidden;
194 extern double __ieee754_fmod(double, double) attribute_hidden;
195 extern double __ieee754_pow(double, double) attribute_hidden;
196 extern double __ieee754_lgamma_r(double, int *) attribute_hidden;
197 extern double __ieee754_gamma_r(double, int *) attribute_hidden;
198 extern double __ieee754_lgamma(double) attribute_hidden;
199 extern double __ieee754_gamma(double) attribute_hidden;
200 extern double __ieee754_log10(double) attribute_hidden;
201 extern double __ieee754_sinh(double) attribute_hidden;
202 extern double __ieee754_hypot(double, double) attribute_hidden;
203 extern double __ieee754_j0(double) attribute_hidden;
204 extern double __ieee754_j1(double) attribute_hidden;
205 extern double __ieee754_y0(double) attribute_hidden;
206 extern double __ieee754_y1(double) attribute_hidden;
207 extern double __ieee754_jn(int, double) attribute_hidden;
208 extern double __ieee754_yn(int, double) attribute_hidden;
209 extern double __ieee754_remainder(double, double) attribute_hidden;
210 extern int32_t __ieee754_rem_pio2(double, double *) attribute_hidden;
211#if defined(_SCALB_INT)
212 extern double __ieee754_scalb(double, int) attribute_hidden;
213#else
214 extern double __ieee754_scalb(double, double) attribute_hidden;
215#endif
216
217/* fdlibm kernel function */
218#ifndef _IEEE_LIBM
219 extern double __kernel_standard(double, double, int) attribute_hidden;
220#endif
221 extern double __kernel_sin(double, double, int) attribute_hidden;
222 extern double __kernel_cos(double, double) attribute_hidden;
223 extern double __kernel_tan(double, double, int) attribute_hidden;
224 extern int32_t __kernel_rem_pio2(const double *, double *, int, int, const unsigned int,
225 const int32_t *) attribute_hidden;
226
227#endif /* _MATH_PRIVATE_H_ */
228