fdlibm.h
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上传日期:2007-01-17
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文件大小:7k
- /* @(#)fdlibm.h 5.1 93/09/24 */
- /*
- * ====================================================
- * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
- *
- * Developed at SunPro, a Sun Microsystems, Inc. business.
- * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice
- * is preserved.
- * ====================================================
- */
- /* CYGNUS LOCAL: Include files. */
- #include <math.h>
- #include "ieeefp.h"
- /* CYGNUS LOCAL: Default to XOPEN_MODE. */
- #define _XOPEN_MODE
- #ifndef __P
- #ifdef __STDC__
- #define __P(p) p
- #else
- #define __P(p) ()
- #endif
- #endif
- #define HUGE ((float)3.40282346638528860e+38)
- /*
- * set X_TLOSS = pi*2**52, which is possibly defined in <values.h>
- * (one may replace the following line by "#include <values.h>")
- */
- #define X_TLOSS 1.41484755040568800000e+16
- /* glue typedefs for VxWorks */
- typedef int __int32_t;
- typedef unsigned int __uint32_t;
- /* Functions that are not documented, and are not in <math.h>. */
- extern double logb __P((double));
- #ifdef _SCALB_INT
- extern double scalb __P((double, int));
- #else
- extern double scalb __P((double, double));
- #endif
- extern double significand __P((double));
- /* ieee style elementary functions */
- extern double __ieee754_sqrt __P((double));
- extern double __ieee754_acos __P((double));
- extern double __ieee754_acosh __P((double));
- extern double __ieee754_log __P((double));
- extern double __ieee754_atanh __P((double));
- extern double __ieee754_asin __P((double));
- extern double __ieee754_atan2 __P((double,double));
- extern double __ieee754_exp __P((double));
- extern double __ieee754_cosh __P((double));
- extern double __ieee754_fmod __P((double,double));
- extern double __ieee754_pow __P((double,double));
- extern double __ieee754_lgamma_r __P((double,int *));
- extern double __ieee754_gamma_r __P((double,int *));
- extern double __ieee754_log10 __P((double));
- extern double __ieee754_sinh __P((double));
- extern double __ieee754_hypot __P((double,double));
- extern double __ieee754_j0 __P((double));
- extern double __ieee754_j1 __P((double));
- extern double __ieee754_y0 __P((double));
- extern double __ieee754_y1 __P((double));
- extern double __ieee754_jn __P((int,double));
- extern double __ieee754_yn __P((int,double));
- extern double __ieee754_remainder __P((double,double));
- extern __int32_t __ieee754_rem_pio2 __P((double,double*));
- #ifdef _SCALB_INT
- extern double __ieee754_scalb __P((double,int));
- #else
- extern double __ieee754_scalb __P((double,double));
- #endif
- /* fdlibm kernel function */
- extern double __kernel_standard __P((double,double,int));
- extern double __kernel_sin __P((double,double,int));
- extern double __kernel_cos __P((double,double));
- extern double __kernel_tan __P((double,double,int));
- extern int __kernel_rem_pio2 __P((double*,double*,int,int,int,const __int32_t*));
- /* Undocumented float functions. */
- extern float logbf __P((float));
- #ifdef _SCALB_INT
- extern float scalbf __P((float, int));
- #else
- extern float scalbf __P((float, float));
- #endif
- extern float significandf __P((float));
- /* ieee style elementary float functions */
- extern float __ieee754_sqrtf __P((float));
- extern float __ieee754_acosf __P((float));
- extern float __ieee754_acoshf __P((float));
- extern float __ieee754_logf __P((float));
- extern float __ieee754_atanhf __P((float));
- extern float __ieee754_asinf __P((float));
- extern float __ieee754_atan2f __P((float,float));
- extern float __ieee754_expf __P((float));
- extern float __ieee754_coshf __P((float));
- extern float __ieee754_fmodf __P((float,float));
- extern float __ieee754_powf __P((float,float));
- extern float __ieee754_lgammaf_r __P((float,int *));
- extern float __ieee754_gammaf_r __P((float,int *));
- extern float __ieee754_log10f __P((float));
- extern float __ieee754_sinhf __P((float));
- extern float __ieee754_hypotf __P((float,float));
- extern float __ieee754_j0f __P((float));
- extern float __ieee754_j1f __P((float));
- extern float __ieee754_y0f __P((float));
- extern float __ieee754_y1f __P((float));
- extern float __ieee754_jnf __P((int,float));
- extern float __ieee754_ynf __P((int,float));
- extern float __ieee754_remainderf __P((float,float));
- extern __int32_t __ieee754_rem_pio2f __P((float,float*));
- #ifdef _SCALB_INT
- extern float __ieee754_scalbf __P((float,int));
- #else
- extern float __ieee754_scalbf __P((float,float));
- #endif
- /* float versions of fdlibm kernel functions */
- extern float __kernel_sinf __P((float,float,int));
- extern float __kernel_cosf __P((float,float));
- extern float __kernel_tanf __P((float,float,int));
- extern int __kernel_rem_pio2f __P((float*,float*,int,int,int,const __int32_t*));
- /* The original code used statements like
- n0 = ((*(int*)&one)>>29)^1; * index of high word *
- ix0 = *(n0+(int*)&x); * high word of x *
- ix1 = *((1-n0)+(int*)&x); * low word of x *
- to dig two 32 bit words out of the 64 bit IEEE floating point
- value. That is non-ANSI, and, moreover, the gcc instruction
- scheduler gets it wrong. We instead use the following macros.
- Unlike the original code, we determine the endianness at compile
- time, not at run time; I don't see much benefit to selecting
- endianness at run time. */
- #ifndef __IEEE_BIG_ENDIAN
- #ifndef __IEEE_LITTLE_ENDIAN
- #error Must define endianness
- #endif
- #endif
- /* A union which permits us to convert between a double and two 32 bit
- ints. */
- #ifdef __IEEE_BIG_ENDIAN
- typedef union
- {
- double value;
- struct
- {
- __uint32_t msw;
- __uint32_t lsw;
- } parts;
- } ieee_double_shape_type;
- #endif
- #ifdef __IEEE_LITTLE_ENDIAN
- typedef union
- {
- double value;
- struct
- {
- __uint32_t lsw;
- __uint32_t msw;
- } parts;
- } ieee_double_shape_type;
- #endif
- /* Get two 32 bit ints from a double. */
- #define EXTRACT_WORDS(ix0,ix1,d)
- do {
- ieee_double_shape_type ew_u;
- ew_u.value = (d);
- (ix0) = ew_u.parts.msw;
- (ix1) = ew_u.parts.lsw;
- } while (0)
- /* Get the more significant 32 bit int from a double. */
- #define GET_HIGH_WORD(i,d)
- do {
- ieee_double_shape_type gh_u;
- gh_u.value = (d);
- (i) = gh_u.parts.msw;
- } while (0)
- /* Get the less significant 32 bit int from a double. */
- #define GET_LOW_WORD(i,d)
- do {
- ieee_double_shape_type gl_u;
- gl_u.value = (d);
- (i) = gl_u.parts.lsw;
- } while (0)
- /* Set a double from two 32 bit ints. */
- #define INSERT_WORDS(d,ix0,ix1)
- do {
- ieee_double_shape_type iw_u;
- iw_u.parts.msw = (ix0);
- iw_u.parts.lsw = (ix1);
- (d) = iw_u.value;
- } while (0)
- /* Set the more significant 32 bits of a double from an int. */
- #define SET_HIGH_WORD(d,v)
- do {
- ieee_double_shape_type sh_u;
- sh_u.value = (d);
- sh_u.parts.msw = (v);
- (d) = sh_u.value;
- } while (0)
- /* Set the less significant 32 bits of a double from an int. */
- #define SET_LOW_WORD(d,v)
- do {
- ieee_double_shape_type sl_u;
- sl_u.value = (d);
- sl_u.parts.lsw = (v);
- (d) = sl_u.value;
- } while (0)
- /* A union which permits us to convert between a float and a 32 bit
- int. */
- typedef union
- {
- float value;
- __uint32_t word;
- } ieee_float_shape_type;
- /* Get a 32 bit int from a float. */
- #define GET_FLOAT_WORD(i,d)
- do {
- ieee_float_shape_type gf_u;
- gf_u.value = (d);
- (i) = gf_u.word;
- } while (0)
- /* Set a float from a 32 bit int. */
- #define SET_FLOAT_WORD(d,i)
- do {
- ieee_float_shape_type sf_u;
- sf_u.word = (i);
- (d) = sf_u.value;
- } while (0)