math2.h

来自「AVR下的ICC所有函数库代码」· C头文件 代码 · 共 44 行

#ifndef __MATH2_H
#define __MATH2_H

/* Based on Everett Greene's math2_a.c
 */

#define BYTE    signed char
#define UBYTE   unsigned char
#define WORD    signed short
#define LONG    signed long
#define ULONG   unsigned long
#define BOOL    UBYTE
#define FALSE   0
#define TRUE    (~FALSE)

typedef
  union {
    float       f;
    LONG        i;}             FI_union_t;

typedef
  struct {
    UBYTE       flag,
                sign;
    WORD        e2;
    LONG        m;}             EFG_intd_t;

/* for decompose */
#define ZERO_CODE               1
#define DENORMALIZED_CODE       2
#define INFINITY_CODE           3
#define SIGNALLING_NaN_CODE     4
#define NONSIGNALLING_NaN_CODE  5
#define PREFIX_FLAG             0x40
#define SIGN_FLAG               0X80

BYTE _decompose(LONG *x, EFG_intd_t *y);

#if !defined(min)
#define min(x, y)	((x < y) ? x : y)
#endif

#endif