167 lines
4.6 KiB
C
167 lines
4.6 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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* $NetBSD: math_private.h,v 1.12 2005/07/21 12:55:58 christos 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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/* 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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* The ARM ports are little endian except for the FPA word order which is
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* big endian.
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*/
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#if (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || (defined(__arm__) && !defined(__VFP_FP__))
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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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unsigned int msw;
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unsigned int lsw;
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} parts;
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} ieee_double_shape_type;
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#endif
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#if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) && !(defined(__arm__) && !defined(__VFP_FP__))
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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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unsigned int lsw;
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unsigned int 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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/** Compute the value of the cosine of Arg, measured in radians.
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@param[in] Arg The value to compute the cosine of.
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@return The computed value of the cosine of Arg.
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**/
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double cos(double Arg);
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/** Compute the value of the sine of Arg.
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@param[in] Arg The value to compute the sine of.
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@return The computed value of the sine of Arg.
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**/
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double sin(double Arg);
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/** Compute the absolute value of Arg.
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@param[in] Arg The value to compute the absolute value of.
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@return The absolute value of Arg.
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**/
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double fabs(double Arg);
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/** Compute the largest integer value not greater than Arg.
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@param[in] Arg The value to compute the floor of.
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@return The largest integer value not greater than Arg, expressed as a floating-point number.
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**/
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double floor(double);
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/* ieee style elementary functions */
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extern int __ieee754_rem_pio2 (double,double*);
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/* fdlibm kernel function */
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extern double __kernel_sin (double, double, int);
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extern double __kernel_cos (double, double);
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extern int __kernel_rem_pio2 (double*,double*,int,int,int,const int*);
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/**@{
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C99, Posix, or NetBSD functions that are not part of the C95 specification.
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**/
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/*
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* Functions callable from C, intended to support IEEE arithmetic.
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*/
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double scalbn(double, int);
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double copysign(double, double);
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#endif /* _MATH_PRIVATE_H_ */ |