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 * $NetBSD: math_private.h,v 1.11 2001/02/21 18:09:26 bjh21 Exp $
15 * $DragonFly: src/lib/libm/src/math_private.h,v 1.1 2005/07/26 21:15:20 joerg Exp $
18 #ifndef _MATH_PRIVATE_H_
19 #define _MATH_PRIVATE_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
38 * The ARM ports are little endian except for the FPA word order which is
42 #if (BYTE_ORDER == BIG_ENDIAN) || (defined(__arm__) && !defined(__VFP_FP__))
52 } ieee_double_shape_type;
56 #if (BYTE_ORDER == LITTLE_ENDIAN) && \
57 !(defined(__arm__) && !defined(__VFP_FP__))
67 } ieee_double_shape_type;
71 /* Get two 32 bit ints from a double. */
73 #define EXTRACT_WORDS(ix0,ix1,d) \
75 ieee_double_shape_type ew_u; \
77 (ix0) = ew_u.parts.msw; \
78 (ix1) = ew_u.parts.lsw; \
81 /* Get the more significant 32 bit int from a double. */
83 #define GET_HIGH_WORD(i,d) \
85 ieee_double_shape_type gh_u; \
87 (i) = gh_u.parts.msw; \
90 /* Get the less significant 32 bit int from a double. */
92 #define GET_LOW_WORD(i,d) \
94 ieee_double_shape_type gl_u; \
96 (i) = gl_u.parts.lsw; \
99 /* Set a double from two 32 bit ints. */
101 #define INSERT_WORDS(d,ix0,ix1) \
103 ieee_double_shape_type iw_u; \
104 iw_u.parts.msw = (ix0); \
105 iw_u.parts.lsw = (ix1); \
109 /* Set the more significant 32 bits of a double from an int. */
111 #define SET_HIGH_WORD(d,v) \
113 ieee_double_shape_type sh_u; \
115 sh_u.parts.msw = (v); \
119 /* Set the less significant 32 bits of a double from an int. */
121 #define SET_LOW_WORD(d,v) \
123 ieee_double_shape_type sl_u; \
125 sl_u.parts.lsw = (v); \
129 /* A union which permits us to convert between a float and a 32 bit
136 } ieee_float_shape_type;
138 /* Get a 32 bit int from a float. */
140 #define GET_FLOAT_WORD(i,d) \
142 ieee_float_shape_type gf_u; \
147 /* Set a float from a 32 bit int. */
149 #define SET_FLOAT_WORD(d,i) \
151 ieee_float_shape_type sf_u; \
157 #pragma GCC visibility push(hidden)
159 /* ieee style elementary functions */
160 int __libm_rem_pio2(double, double*);
162 /* fdlibm kernel function */
163 double __kernel_sin(double, double, int);
164 double __kernel_cos(double, double);
165 double __kernel_tan(double, double, int);
166 int __kernel_rem_pio2(double*, double*, int, int, int, const int*);
169 /* ieee style elementary float functions */
170 int __libm_rem_pio2f(float,float*);
172 /* float versions of fdlibm kernel functions */
173 float __kernel_sinf(float, float, int);
174 float __kernel_cosf(float, float);
175 float __kernel_tanf(float, float, int);
176 int __kernel_rem_pio2f(float*, float*, int, int, int, const int*);
178 #pragma GCC visibility pop
181 #endif /* _MATH_PRIVATE_H_ */