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Line 28... | Line 28... | ||
28 | 28 | ||
29 | #include <arch/fmath.h> |
29 | #include <arch/fmath.h> |
30 | #include <print.h> |
30 | #include <print.h> |
31 | 31 | ||
32 | #define FMATH_MANTISA_MASK ( 0x000fffffffffffffLL ) |
32 | #define FMATH_MANTISA_MASK ( 0x000fffffffffffffLL ) |
33 | - | ||
34 | int fmath_is_negative(double num) |
33 | #define FMATH_NAN ( 0x0001000000000001LL ) |
35 | { |
- | |
36 | fmath_ld_union_t fmath_ld_union; |
- | |
37 | fmath_ld_union.bf = num; |
- | |
38 | return ((fmath_ld_union.ldd[7])&0x80)==0x80; /*first bit is sign, IA32 is little endian -> 8th byte*/ |
- | |
39 | - | ||
40 | } |
- | |
41 | - | ||
42 | signed short fmath_get_binary_exponent(double num) |
34 | signed short fmath_get_binary_exponent(double num) |
43 | { |
35 | { |
44 | fmath_ld_union_t fmath_ld_union; |
36 | fmath_ld_union_t fmath_ld_union; |
45 | fmath_ld_union.bf = num; |
37 | fmath_ld_union.bf = num; |
46 | return (signed short)((((fmath_ld_union.ldd[7])&0x7f)<<4) + (((fmath_ld_union.ldd[6])&0xf0)>>4)) -FMATH_EXPONENT_BIAS; /* exponent is 11 bits lenght, so sevent bits is in 8th byte and 4 bits in 7th */ |
38 | return (signed short)((((fmath_ld_union.ldd[7])&0x7f)<<4) + (((fmath_ld_union.ldd[6])&0xf0)>>4)) -FMATH_EXPONENT_BIAS; /* exponent is 11 bits lenght, so sevent bits is in 8th byte and 4 bits in 7th */ |
Line 75... | Line 67... | ||
75 | 67 | ||
76 | exp=fmath_get_binary_exponent(num); |
68 | exp=fmath_get_binary_exponent(num); |
77 | 69 | ||
78 | if (exp<0) { |
70 | if (exp<0) { |
79 | *intp = 0.0; |
71 | *intp = 0.0; |
80 | *intp = fmath_set_sign(0.0L,fmath_is_negative(num)); |
- | |
81 | return num; |
72 | return num; |
82 | } |
73 | } |
83 | 74 | ||
84 | 75 | ||
85 | if (exp>51) { |
76 | if (exp>51) { |
86 | *intp=num; |
77 | *intp=num; |
87 | num=0.0; |
78 | num=0.0; |
88 | num= fmath_set_sign(0.0L,fmath_is_negative(*intp)); |
- | |
89 | return num; |
79 | return num; |
90 | } |
80 | } |
91 | 81 | ||
92 | fmath_ld_union_num.bf = num; |
82 | fmath_ld_union_num.bf = num; |
93 | 83 | ||
Line 104... | Line 94... | ||
104 | 94 | ||
105 | *intp=fmath_ld_union_int.bf; |
95 | *intp=fmath_ld_union_int.bf; |
106 | return fmath_ld_union_num.bf-fmath_ld_union_int.bf; |
96 | return fmath_ld_union_num.bf-fmath_ld_union_int.bf; |
107 | }; |
97 | }; |
108 | 98 | ||
109 | double fmath_set_sign(double num,__u8 sign) |
- | |
110 | { |
- | |
111 | fmath_ld_union_t fmath_ld_union; |
- | |
112 | fmath_ld_union.bf = num; |
- | |
113 | fmath_ld_union.ldd[7]=((fmath_ld_union.ldd[7])&0x7f)|(sign<<7); /* change 64th bit (IA32 is a little endian)*/ |
- | |
114 | return fmath_ld_union.bf; |
- | |
115 | } |
- | |
116 | - | ||
117 | double fmath_abs(double num) |
- | |
118 | { |
- | |
119 | return fmath_set_sign(num,0); |
- | |
120 | } |
- | |
121 | 99 | ||
122 | double fmath_dpow(double base, double exponent) |
100 | double fmath_dpow(double base, double exponent) |
123 | { |
101 | { |
124 | double value=1.0; |
102 | double value=1.0; |
125 | if (base<=0.0) return base; |
103 | if (base<=0.0) return base; |
Line 139... | Line 117... | ||
139 | "fstp %%st(1) \n\t" \ |
117 | "fstp %%st(1) \n\t" \ |
140 | "" : "=t" (value) : "0" (base), "u" (exponent) ); |
118 | "" : "=t" (value) : "0" (base), "u" (exponent) ); |
141 | return value; |
119 | return value; |
142 | } |
120 | } |
143 | 121 | ||
- | 122 | int fmath_is_nan(double num) |
|
- | 123 | { |
|
- | 124 | __u16 exp; |
|
- | 125 | fmath_ld_union_t fmath_ld_union; |
|
- | 126 | fmath_ld_union.bf = num; |
|
- | 127 | exp=(((fmath_ld_union.ldd[7])&0x7f)<<4) + (((fmath_ld_union.ldd[6])&0xf0)>>4); /* exponent is 11 bits lenght, so sevent bits is in 8th byte and 4 bits in 7th */ |
|
- | 128 | ||
- | 129 | if (exp!=0x07ff) return 0; |
|
- | 130 | if (fmath_get_binary_mantisa(num)>=FMATH_NAN) return 1; |
|
- | 131 | ||
- | 132 | ||
- | 133 | return 0; |
|
- | 134 | } |
|
- | 135 | ||
- | 136 | int fmath_is_infinity(double num) |
|
- | 137 | { |
|
- | 138 | __u16 exp; |
|
- | 139 | fmath_ld_union_t fmath_ld_union; |
|
- | 140 | fmath_ld_union.bf = num; |
|
- | 141 | exp=(((fmath_ld_union.ldd[7])&0x7f)<<4) + (((fmath_ld_union.ldd[6])&0xf0)>>4); /* exponent is 11 bits lenght, so sevent bits is in 8th byte and 4 bits in 7th */ |
|
- | 142 | ||
- | 143 | if (exp!=0x07ff) return 0; |
|
- | 144 | if (fmath_get_binary_mantisa(num)==0x0) return 1; |
|
- | 145 | return 0; |
|
- | 146 | } |