mirror of https://github.com/encounter/SDL.git
228 lines
6.8 KiB
C
228 lines
6.8 KiB
C
/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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/*
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* from: @(#)fdlibm.h 5.1 93/09/24
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* $Id: math_private.h,v 1.3 2004/02/09 07:10:38 andersen Exp $
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*/
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#ifndef _MATH_PRIVATE_H_
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#define _MATH_PRIVATE_H_
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/* #include <endian.h> */
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#include "SDL_endian.h"
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/* #include <sys/types.h> */
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#define _IEEE_LIBM
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#define attribute_hidden
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#define libm_hidden_proto(x)
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#define libm_hidden_def(x)
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#define strong_alias(x, y)
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#ifndef __HAIKU__ /* already defined in a system header. */
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typedef unsigned int u_int32_t;
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#endif
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#define atan SDL_uclibc_atan
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#define __ieee754_atan2 SDL_uclibc_atan2
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#define copysign SDL_uclibc_copysign
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#define cos SDL_uclibc_cos
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#define __ieee754_exp SDL_uclibc_exp
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#define fabs SDL_uclibc_fabs
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#define floor SDL_uclibc_floor
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#define __ieee754_fmod SDL_uclibc_fmod
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#define __ieee754_log SDL_uclibc_log
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#define __ieee754_log10 SDL_uclibc_log10
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#define __ieee754_pow SDL_uclibc_pow
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#define scalbln SDL_uclibc_scalbln
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#define scalbn SDL_uclibc_scalbn
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#define sin SDL_uclibc_sin
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#define __ieee754_sqrt SDL_uclibc_sqrt
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#define tan SDL_uclibc_tan
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/* The original fdlibm code used statements like:
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n0 = ((*(int*)&one)>>29)^1; * index of high word *
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ix0 = *(n0+(int*)&x); * high word of x *
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ix1 = *((1-n0)+(int*)&x); * low word of x *
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to dig two 32 bit words out of the 64 bit IEEE floating point
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value. That is non-ANSI, and, moreover, the gcc instruction
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scheduler gets it wrong. We instead use the following macros.
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Unlike the original code, we determine the endianness at compile
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time, not at run time; I don't see much benefit to selecting
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endianness at run time. */
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/* A union which permits us to convert between a double and two 32 bit
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ints. */
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/*
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* Math on arm is special:
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* For FPA, float words are always big-endian.
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* For VFP, floats words follow the memory system mode.
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*/
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#if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
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typedef union
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{
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double value;
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struct
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{
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u_int32_t msw;
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u_int32_t lsw;
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} parts;
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} ieee_double_shape_type;
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#else
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typedef union
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{
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double value;
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struct
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{
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u_int32_t lsw;
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u_int32_t msw;
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} parts;
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} ieee_double_shape_type;
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#endif
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/* Get two 32 bit ints from a double. */
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#define EXTRACT_WORDS(ix0,ix1,d) \
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do { \
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ieee_double_shape_type ew_u; \
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ew_u.value = (d); \
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(ix0) = ew_u.parts.msw; \
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(ix1) = ew_u.parts.lsw; \
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} while (0)
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/* Get the more significant 32 bit int from a double. */
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#define GET_HIGH_WORD(i,d) \
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do { \
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ieee_double_shape_type gh_u; \
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gh_u.value = (d); \
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(i) = gh_u.parts.msw; \
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} while (0)
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/* Get the less significant 32 bit int from a double. */
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#define GET_LOW_WORD(i,d) \
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do { \
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ieee_double_shape_type gl_u; \
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gl_u.value = (d); \
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(i) = gl_u.parts.lsw; \
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} while (0)
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/* Set a double from two 32 bit ints. */
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#define INSERT_WORDS(d,ix0,ix1) \
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do { \
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ieee_double_shape_type iw_u; \
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iw_u.parts.msw = (ix0); \
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iw_u.parts.lsw = (ix1); \
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(d) = iw_u.value; \
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} while (0)
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/* Set the more significant 32 bits of a double from an int. */
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#define SET_HIGH_WORD(d,v) \
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do { \
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ieee_double_shape_type sh_u; \
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sh_u.value = (d); \
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sh_u.parts.msw = (v); \
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(d) = sh_u.value; \
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} while (0)
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/* Set the less significant 32 bits of a double from an int. */
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#define SET_LOW_WORD(d,v) \
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do { \
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ieee_double_shape_type sl_u; \
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sl_u.value = (d); \
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sl_u.parts.lsw = (v); \
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(d) = sl_u.value; \
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} while (0)
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/* A union which permits us to convert between a float and a 32 bit
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int. */
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typedef union
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{
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float value;
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u_int32_t word;
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} ieee_float_shape_type;
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/* Get a 32 bit int from a float. */
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#define GET_FLOAT_WORD(i,d) \
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do { \
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ieee_float_shape_type gf_u; \
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gf_u.value = (d); \
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(i) = gf_u.word; \
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} while (0)
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/* Set a float from a 32 bit int. */
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#define SET_FLOAT_WORD(d,i) \
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do { \
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ieee_float_shape_type sf_u; \
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sf_u.word = (i); \
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(d) = sf_u.value; \
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} while (0)
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/* ieee style elementary functions */
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extern double
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__ieee754_sqrt(double)
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attribute_hidden;
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extern double __ieee754_acos(double) attribute_hidden;
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extern double __ieee754_acosh(double) attribute_hidden;
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extern double __ieee754_log(double) attribute_hidden;
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extern double __ieee754_atanh(double) attribute_hidden;
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extern double __ieee754_asin(double) attribute_hidden;
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extern double __ieee754_atan2(double, double) attribute_hidden;
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extern double __ieee754_exp(double) attribute_hidden;
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extern double __ieee754_cosh(double) attribute_hidden;
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extern double __ieee754_fmod(double, double) attribute_hidden;
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extern double __ieee754_pow(double, double) attribute_hidden;
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extern double __ieee754_lgamma_r(double, int *) attribute_hidden;
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extern double __ieee754_gamma_r(double, int *) attribute_hidden;
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extern double __ieee754_lgamma(double) attribute_hidden;
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extern double __ieee754_gamma(double) attribute_hidden;
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extern double __ieee754_log10(double) attribute_hidden;
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extern double __ieee754_sinh(double) attribute_hidden;
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extern double __ieee754_hypot(double, double) attribute_hidden;
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extern double __ieee754_j0(double) attribute_hidden;
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extern double __ieee754_j1(double) attribute_hidden;
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extern double __ieee754_y0(double) attribute_hidden;
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extern double __ieee754_y1(double) attribute_hidden;
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extern double __ieee754_jn(int, double) attribute_hidden;
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extern double __ieee754_yn(int, double) attribute_hidden;
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extern double __ieee754_remainder(double, double) attribute_hidden;
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extern int32_t __ieee754_rem_pio2(double, double *) attribute_hidden;
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#if defined(_SCALB_INT)
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extern double __ieee754_scalb(double, int) attribute_hidden;
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#else
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extern double __ieee754_scalb(double, double) attribute_hidden;
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#endif
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/* fdlibm kernel function */
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#ifndef _IEEE_LIBM
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extern double __kernel_standard(double, double, int) attribute_hidden;
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#endif
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extern double __kernel_sin(double, double, int) attribute_hidden;
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extern double __kernel_cos(double, double) attribute_hidden;
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extern double __kernel_tan(double, double, int) attribute_hidden;
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extern int32_t __kernel_rem_pio2(const double *, double *, int, int, const unsigned int,
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const int32_t *) attribute_hidden;
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#endif /* _MATH_PRIVATE_H_ */
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