| blob | 943463a45bce3184b58fa20788a4fa9b389f5096 |
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: math_private.h 14968 2005-11-16 18:33:51Z korli $
15 */
17 #ifndef _MATH_PRIVATE_H_
18 #define _MATH_PRIVATE_H_
20 #include <endian.h>
21 #include <sys/types.h>
22 #include <stdint.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
36 ints. */
38 #if __FLOAT_WORD_ORDER == BIG_ENDIAN
41 {
43 struct
44 {
45 u_int32_t msw;
46 u_int32_t lsw;
50 #endif
52 #if __FLOAT_WORD_ORDER == LITTLE_ENDIAN
55 {
57 struct
58 {
59 u_int32_t lsw;
60 u_int32_t msw;
64 #endif
66 /* Get two 32 bit ints from a double. */
68 #define EXTRACT_WORDS(ix0,ix1,d) \
69 do { \
70 ieee_double_shape_type ew_u; \
71 ew_u.value = (d); \
72 (ix0) = ew_u.parts.msw; \
73 (ix1) = ew_u.parts.lsw; \
74 } while (0)
76 /* Get the more significant 32 bit int from a double. */
78 #define GET_HIGH_WORD(i,d) \
79 do { \
80 ieee_double_shape_type gh_u; \
81 gh_u.value = (d); \
82 (i) = gh_u.parts.msw; \
83 } while (0)
85 /* Get the less significant 32 bit int from a double. */
87 #define GET_LOW_WORD(i,d) \
88 do { \
89 ieee_double_shape_type gl_u; \
90 gl_u.value = (d); \
91 (i) = gl_u.parts.lsw; \
92 } while (0)
94 /* Set a double from two 32 bit ints. */
96 #define INSERT_WORDS(d,ix0,ix1) \
97 do { \
98 ieee_double_shape_type iw_u; \
99 iw_u.parts.msw = (ix0); \
100 iw_u.parts.lsw = (ix1); \
101 (d) = iw_u.value; \
102 } while (0)
104 /* Set the more significant 32 bits of a double from an int. */
106 #define SET_HIGH_WORD(d,v) \
107 do { \
108 ieee_double_shape_type sh_u; \
109 sh_u.value = (d); \
110 sh_u.parts.msw = (v); \
111 (d) = sh_u.value; \
112 } while (0)
114 /* Set the less significant 32 bits of a double from an int. */
116 #define SET_LOW_WORD(d,v) \
117 do { \
118 ieee_double_shape_type sl_u; \
119 sl_u.value = (d); \
120 sl_u.parts.lsw = (v); \
121 (d) = sl_u.value; \
122 } while (0)
124 /* A union which permits us to convert between a float and a 32 bit
125 int. */
128 {
130 u_int32_t word;
133 /* Get a 32 bit int from a float. */
135 #define GET_FLOAT_WORD(i,d) \
136 do { \
137 ieee_float_shape_type gf_u; \
138 gf_u.value = (d); \
139 (i) = gf_u.word; \
140 } while (0)
142 /* Set a float from a 32 bit int. */
144 #define SET_FLOAT_WORD(d,i) \
145 do { \
146 ieee_float_shape_type sf_u; \
147 sf_u.word = (i); \
148 (d) = sf_u.value; \
149 } while (0)
151 /* Get long double macros from a separate header. */
152 #include <math_ldbl.h>
154 /* ieee style elementary functions */
186 /* fdlibm kernel function */
193 /* internal functions. */
197 /* ieee style elementary float functions */
230 /* float versions of fdlibm kernel functions */
236 /* internal functions. */
240 /* ieee style elementary long double functions */
272 /* long double versions of fdlibm kernel functions */
281 #ifndef NO_LONG_DOUBLE
282 /* prototypes required to compile the ldbl-96 support without warnings */
302 #endif
304 /* Prototypes for functions of the IBM Accurate Mathematical Library. */