T536_DTU/dtu/dtu_main_t536/app/floatspc.h

/*******************************************************
* 版本号：  1.00   版本号
* 文件名：  floatspc.c  
* 生成日期：2005.11.11 
* 作者：   钟振新
******************************************************/
#ifndef FLOAT_SPECIAL
#define FLOAT_SPECIAL

#ifdef MODE_LITTLE_ENDIAN
#define CPU_ENDIAN_BIG 0 
#else
#define CPU_ENDIAN_BIG 1 // 1-大尾格式,用于motorola等cpu 
#endif

#define _FPCLASS_SNAN 1
#define _FPCLASS_QNAN 2
#define _FPCLASS_OVER 3

#ifndef FAST
#define FAST 
#endif

#ifndef NULL
#define NULL 0
#endif

#ifdef __cplusplus
     extern "C"{
#endif	


typedef union _u08
{
  unsigned char value;
} _08;

typedef union _u16
{
  struct
  {
  	#if CPU_ENDIAN_BIG 
  	  _08 high08, low08;
  	#else
      _08 low08, high08;
    #endif
  } s;
  unsigned short value;
} _16;

typedef union _u32
{
  struct
  {
    #if CPU_ENDIAN_BIG 
      _16 high16, low16;
    #else
      _16 low16, high16;
    #endif
  } s;
  uint32_t value;
} _32;

typedef struct
{
  _32 i32;
} _rtl_float_t;


int isnan_f (void *_f);


/*长整数快速开根号*/
unsigned short sqrt_16(uint32_t x);
	
float sqrt_32f(uint32_t x);
/*浮点数快速开根号*/
float sqrt_f(float x);

DWORD  sqrt_32fix(DWORD x);

#ifdef __cplusplus
	}
#endif

#endif