| blob | 99be167e388995dadd18d4bd4f302580518afead |
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 */
12 /*
13 * from: @(#)fdlibm.h 5.1 93/09/24
14 * $Id$
15 */
17 #ifndef _MATH_PRIVATE_H_
18 #define _MATH_PRIVATE_H_
20 #include <endian.h>
21 #include <sys/types.h>
23 /* The original fdlibm code used statements like:
24 n0 = ((*(int*)&one)>>29)^1; * index of high word *
25 ix0 = *(n0+(int*)&x); * high word of x *
26 ix1 = *((1-n0)+(int*)&x); * low word of x *
27 to dig two 32 bit words out of the 64 bit IEEE floating point
28 value. That is non-ANSI, and, moreover, the gcc instruction
29 scheduler gets it wrong. We instead use the following macros.
30 Unlike the original code, we determine the endianness at compile
31 time, not at run time; I don't see much benefit to selecting
32 endianness at run time. */
34 /* A union which permits us to convert between a double and two 32 bit
35 ints. */
37 #if __FLOAT_WORD_ORDER == BIG_ENDIAN
40 {
42 struct
43 {
44 u_int32_t msw;
45 u_int32_t lsw;
49 #endif
51 #if __FLOAT_WORD_ORDER == LITTLE_ENDIAN
54 {
56 struct
57 {
58 u_int32_t lsw;
59 u_int32_t msw;
63 #endif
65 /* Get two 32 bit ints from a double. */
67 #define EXTRACT_WORDS(ix0,ix1,d) \
68 do { \
69 ieee_double_shape_type ew_u; \
70 ew_u.value = (d); \
71 (ix0) = ew_u.parts.msw; \
72 (ix1) = ew_u.parts.lsw; \
73 } while (0)
75 /* Get the more significant 32 bit int from a double. */
77 #define GET_HIGH_WORD(i,d) \
78 do { \
79 ieee_double_shape_type gh_u; \
80 gh_u.value = (d); \
81 (i) = gh_u.parts.msw; \
82 } while (0)
84 /* Get the less significant 32 bit int from a double. */
86 #define GET_LOW_WORD(i,d) \
87 do { \
88 ieee_double_shape_type gl_u; \
89 gl_u.value = (d); \
90 (i) = gl_u.parts.lsw; \
91 } while (0)
93 /* Set a double from two 32 bit ints. */
95 #define INSERT_WORDS(d,ix0,ix1) \
96 do { \
97 ieee_double_shape_type iw_u; \
98 iw_u.parts.msw = (ix0); \
99 iw_u.parts.lsw = (ix1); \
100 (d) = iw_u.value; \
101 } while (0)
103 /* Set the more significant 32 bits of a double from an int. */
105 #define SET_HIGH_WORD(d,v) \
106 do { \
107 ieee_double_shape_type sh_u; \
108 sh_u.value = (d); \
109 sh_u.parts.msw = (v); \
110 (d) = sh_u.value; \
111 } while (0)
113 /* Set the less significant 32 bits of a double from an int. */
115 #define SET_LOW_WORD(d,v) \
116 do { \
117 ieee_double_shape_type sl_u; \
118 sl_u.value = (d); \
119 sl_u.parts.lsw = (v); \
120 (d) = sl_u.value; \
121 } while (0)
123 /* A union which permits us to convert between a float and a 32 bit
124 int. */
127 {
129 u_int32_t word;
132 /* Get a 32 bit int from a float. */
134 #define GET_FLOAT_WORD(i,d) \
135 do { \
136 ieee_float_shape_type gf_u; \
137 gf_u.value = (d); \
138 (i) = gf_u.word; \
139 } while (0)
141 /* Set a float from a 32 bit int. */
143 #define SET_FLOAT_WORD(d,i) \
144 do { \
145 ieee_float_shape_type sf_u; \
146 sf_u.word = (i); \
147 (d) = sf_u.value; \
148 } while (0)
150 /* Get long double macros from a separate header. */
151 #include <math_ldbl.h>
153 /* ieee style elementary functions */
184 /* fdlibm kernel function */
192 /* ieee style elementary float functions */
223 /* float versions of fdlibm kernel functions */
230 /* ieee style elementary long double functions */
261 /* long double versions of fdlibm kernel functions */