math.h

ti公司的dsp常用算法和程序.共有七个文件.C30Fast_FFT,C30FFT,fft2xx,fftRound2,ieeeConv,MatRix,SPI等.

/********************************************************************/
/* math.h   v4.40                                                   */
/* Copyright (c) 1991 Texas Instruments Incorporated                */
/********************************************************************/
#ifndef _MATH
#define _MATH

#if _INLINE
#define __INLINE static inline
#else
#define __INLINE
#endif

#define HUGE_VAL  3.4028235e38       /* maximum number                        */

/***************************************************************/
/* FUNCTION DECLARATIONS.                                      */
/***************************************************************/
         double asin(double _x);
         double acos(double _x);
         double atan(double _x);
         double atan2(double _y, double _x);
__INLINE double ceil(double _x);
         double cos(double _x);
         double cosh(double _x);
         double exp(double _x);
         double fabs(double _x);
__INLINE double floor(double _x);
__INLINE double fmod(double _x, double _y);
         double frexp(double _x, int *_exp);
         double ldexp(double _x, int _exp);
         double log(double _x);
         double log10(double _x);
         double modf(double _x, double *_iptr);
         double pow(double _x, double _y);
         double sin(double _x);
         double sinh(double _x);
         double sqrt(double _x);
         double tan(double _x);
         double tanh(double _x);

#if _INLINE
/****************************************************************************/
/*  ceil()       				                            */
/****************************************************************************/
static inline double ceil(double x)
{
     double y; 
     return (modf(x, &y) > 0 ? y + 1.0 : y);
}

/****************************************************************************/
/*  floor()      				                            */
/****************************************************************************/
static inline double floor(double x)
{
     double y; 
     return (modf(x, &y) < 0 ? y - 1.0 : y);
}

/****************************************************************************/
/*  fmod()       				                            */
/****************************************************************************/
static inline double fmod(double x, double y)
{
   double d = fabs(x); 

   if (d - fabs(y) == d) return (0.0);
   modf(x/y, &d);
   return (x - d * y);
}
#endif /* _INLINE */
#undef __INLINE

#endif /* _MATH   */