30,15 → 30,7 |
#include <print.h> |
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#define FMATH_MANTISA_MASK ( 0x000fffffffffffffLL ) |
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int fmath_is_negative(double num) |
{ |
fmath_ld_union_t fmath_ld_union; |
fmath_ld_union.bf = num; |
return ((fmath_ld_union.ldd[7])&0x80)==0x80; /*first bit is sign, IA32 is little endian -> 8th byte*/ |
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} |
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#define FMATH_NAN ( 0x0001000000000001LL ) |
signed short fmath_get_binary_exponent(double num) |
{ |
fmath_ld_union_t fmath_ld_union; |
77,7 → 69,6 |
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if (exp<0) { |
*intp = 0.0; |
*intp = fmath_set_sign(0.0L,fmath_is_negative(num)); |
return num; |
} |
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85,7 → 76,6 |
if (exp>51) { |
*intp=num; |
num=0.0; |
num= fmath_set_sign(0.0L,fmath_is_negative(*intp)); |
return num; |
} |
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106,19 → 96,7 |
return fmath_ld_union_num.bf-fmath_ld_union_int.bf; |
}; |
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double fmath_set_sign(double num,__u8 sign) |
{ |
fmath_ld_union_t fmath_ld_union; |
fmath_ld_union.bf = num; |
fmath_ld_union.ldd[7]=((fmath_ld_union.ldd[7])&0x7f)|(sign<<7); /* change 64th bit (IA32 is a little endian)*/ |
return fmath_ld_union.bf; |
} |
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double fmath_abs(double num) |
{ |
return fmath_set_sign(num,0); |
} |
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double fmath_dpow(double base, double exponent) |
{ |
double value=1.0; |
141,3 → 119,28 |
return value; |
} |
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int fmath_is_nan(double num) |
{ |
__u16 exp; |
fmath_ld_union_t fmath_ld_union; |
fmath_ld_union.bf = num; |
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 */ |
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if (exp!=0x07ff) return 0; |
if (fmath_get_binary_mantisa(num)>=FMATH_NAN) return 1; |
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return 0; |
} |
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int fmath_is_infinity(double num) |
{ |
__u16 exp; |
fmath_ld_union_t fmath_ld_union; |
fmath_ld_union.bf = num; |
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 */ |
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if (exp!=0x07ff) return 0; |
if (fmath_get_binary_mantisa(num)==0x0) return 1; |
return 0; |
} |