forked from KolibriOS/kolibrios
87 lines
1.3 KiB
C
87 lines
1.3 KiB
C
#include <math.h>
|
|
|
|
double remainder(double numer, double denom)
|
|
{
|
|
double res;
|
|
asm("fldl %2;"
|
|
"fldl %1;"
|
|
"fprem1;"
|
|
"fstpl %0;"
|
|
"fstp %%st;"
|
|
: "=m"(res)
|
|
: "m"(numer), "m"(denom)
|
|
);
|
|
return res;
|
|
}
|
|
//remainder of 5.3 / 2 is -0.700000
|
|
//remainder of 18.5 / 4.2 is 1.700000
|
|
|
|
|
|
|
|
double fmod(double numer, double denom)
|
|
{
|
|
double res;
|
|
asm("fldl %2;"
|
|
"fldl %1;"
|
|
"fprem;"
|
|
"fstpl %0;"
|
|
"fstp %%st;"
|
|
: "=m"(res)
|
|
: "m"(numer), "m"(denom)
|
|
);
|
|
return res;
|
|
}
|
|
// fmod of 5.3 / 2 is 1.300000
|
|
// fmod of 18.5 / 4.2 is 1.700000
|
|
|
|
|
|
double modf(double x, double *intpart)
|
|
{
|
|
double res, intp;
|
|
asm("fldl %2;"
|
|
"fldl %2;"
|
|
"frndint;"
|
|
"fstl %1;"
|
|
"fxch;"
|
|
"fsubp %%st, %%st(1);"
|
|
"fstpl %0"
|
|
: "=m"(res), "=m"(intp)
|
|
: "m"(x)
|
|
);
|
|
*intpart = intp;
|
|
return res;
|
|
}
|
|
|
|
double ldexp (double x, int expon)
|
|
// = x * 2^expot
|
|
{
|
|
double res;
|
|
asm("fildl %2;"
|
|
"fldl %1;"
|
|
"fscale;"
|
|
"fstpl %0;"
|
|
"fstp %%st;"
|
|
: "=m"(res)
|
|
: "m"(x), "m"(expon)
|
|
);
|
|
|
|
return res;
|
|
}
|
|
|
|
double frexp (double x, int* expon)
|
|
{
|
|
double res;
|
|
asm("fldl %2;"
|
|
"fxtract;"
|
|
"fstpl %0;"
|
|
"fistpl %1;"
|
|
"fstp %%st;"
|
|
: "=m"(res), "=m"(*expon)
|
|
: "m"(x)
|
|
);
|
|
|
|
// *expon = (int)ex;
|
|
return res;
|
|
}
|
|
// 8.000000 = 0.500000 * 2^ 4
|