emfloat.h

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C头文件 代码 · 共 117 行

#include <stdio.h>

/*
** DEFINES
*/
#define u8 unsigned char
#define u16 unsigned short
#define u32 unsigned long
#define uchar unsigned char
#define ulong unsigned long

#define MAX_EXP 32767L
#define MIN_EXP (-32767L)

#define IFPF_IS_ZERO 0
#define IFPF_IS_SUBNORMAL 1
#define IFPF_IS_NORMAL 2
#define IFPF_IS_INFINITY 3
#define IFPF_IS_NAN 4
#define IFPF_TYPE_COUNT 5

#define ZERO_ZERO                       0
#define ZERO_SUBNORMAL                  1
#define ZERO_NORMAL                     2
#define ZERO_INFINITY                   3
#define ZERO_NAN                        4

#define SUBNORMAL_ZERO                  5
#define SUBNORMAL_SUBNORMAL             6
#define SUBNORMAL_NORMAL                7
#define SUBNORMAL_INFINITY              8
#define SUBNORMAL_NAN                   9

#define NORMAL_ZERO                     10
#define NORMAL_SUBNORMAL                11
#define NORMAL_NORMAL                   12
#define NORMAL_INFINITY                 13
#define NORMAL_NAN                      14

#define INFINITY_ZERO                   15
#define INFINITY_SUBNORMAL              16
#define INFINITY_NORMAL                 17
#define INFINITY_INFINITY               18
#define INFINITY_NAN                    19

#define NAN_ZERO                        20
#define NAN_SUBNORMAL                   21
#define NAN_NORMAL                      22
#define NAN_INFINITY                    23
#define NAN_NAN                         24
#define OPERAND_ZERO                    0
#define OPERAND_SUBNORMAL               1
#define OPERAND_NORMAL                  2
#define OPERAND_INFINITY                3
#define OPERAND_NAN                     4

/*
** Following already defined in NMGLOBAL.H
**
#define INTERNAL_FPF_PRECISION 4
*/

/*
** TYPEDEFS
*/

typedef struct
{
        u8 type;        /* Indicates, NORMAL, SUBNORMAL, etc. */
        u8 sign;        /* Mantissa sign */
        short exp;      /* Signed exponent...no bias */
        u16 mantissa[INTERNAL_FPF_PRECISION];
} InternalFPF;

/*
** PROTOTYPES
*/
void SetupCPUEmFloatArrays(InternalFPF *abase,
        InternalFPF *bbase, InternalFPF *cbase, ulong arraysize);
ulong DoEmFloatIteration(InternalFPF *abase,
        InternalFPF *bbase, InternalFPF *cbase,
        ulong arraysize, ulong loops, double *wat_time);
static void SetInternalFPFZero(InternalFPF *dest,
                        uchar sign);
static void SetInternalFPFInfinity(InternalFPF *dest,
                        uchar sign);
static void SetInternalFPFNaN(InternalFPF *dest);
static int IsMantissaZero(u16 *mant);
static void Add16Bits(u16 *carry,u16 *a,u16 b,u16 c);
static void Sub16Bits(u16 *borrow,u16 *a,u16 b,u16 c);
static void ShiftMantLeft1(u16 *carry,u16 *mantissa);
static void ShiftMantRight1(u16 *carry,u16 *mantissa);
static void StickyShiftRightMant(InternalFPF *ptr,int amount);
static void normalize(InternalFPF *ptr);
static void denormalize(InternalFPF *ptr,int minimum_exponent);
void RoundInternalFPF(InternalFPF *ptr);
static void choose_nan(InternalFPF *x,InternalFPF *y,InternalFPF *z,
                int intel_flag);
static void AddSubInternalFPF(uchar operation,InternalFPF *x,
                InternalFPF *y,InternalFPF *z);
static void MultiplyInternalFPF(InternalFPF *x,InternalFPF *y,
                        InternalFPF *z);
static void DivideInternalFPF(InternalFPF *x,InternalFPF *y, 
                        InternalFPF *z);
static void LongToInternalFPF(long mylong,
                InternalFPF *dest);
static int InternalFPFToString(char *dest,
                InternalFPF *src);

/*
** EXTERNALS
*/
extern ulong StartStopwatch();
extern ulong StopStopwatch(ulong elapsed);
extern long randwc(long num);