1 typedef unsigned long ulong; 2 typedef unsigned int uint; 3 typedef unsigned short ushort; 4 typedef unsigned char uchar; 5 typedef signed char schar; 6 7 #include <float.h> 8 #include "mathi.h" 9 10 #define NANEXP (2047<<20) 11 #define NANMASK (2047<<20) 12 #define NANSIGN (1<<31) 13 14 int isInf(double, int); 15 16 double 17 NaN(void) 18 { 19 union 20 { 21 double d; 22 long x[2]; 23 } a; 24 25 a.x[1] = NANEXP; 26 a.x[0] = 1; 27 return a.d; 28 } 29 30 int 31 isNaN(double d) 32 { 33 union 34 { 35 double d; 36 long x[2]; 37 } a; 38 39 a.d = d; 40 if((a.x[1] & NANMASK) != NANEXP) 41 return 0; 42 return !isInf(d, 0); 43 } 44 45 double 46 Inf(int sign) 47 { 48 union 49 { 50 double d; 51 long x[2]; 52 } a; 53 54 a.x[1] = NANEXP; 55 a.x[0] = 0; 56 if(sign < 0) 57 a.x[1] |= NANSIGN; 58 return a.d; 59 } 60 61 int 62 isInf(double d, int sign) 63 { 64 union 65 { 66 double d; 67 long x[2]; 68 } a; 69 70 a.d = d; 71 if(a.x[0] != 0) 72 return 0; 73 if(a.x[1] == NANEXP) 74 return sign >= 0; 75 if(a.x[1] == (NANEXP|NANSIGN)) 76 return sign <= 0; 77 return 0; 78 } 79 80 ulong 81 getfcr(void) 82 { 83 return getFPcontrol(); 84 } 85 86 void 87 setfcr(ulong m) 88 { 89 FPcontrol(m, ~0); 90 } 91 92 ulong 93 getfsr(void) 94 { 95 return getFPstatus(); 96 } 97 98 void 99 setfsr(ulong m) 100 { 101 FPstatus(m, ~0); 102 } 103 104 105 106 107 108