kopia lustrzana https://github.com/micropython/micropython
24 wiersze
374 B
C
24 wiersze
374 B
C
#include <math.h>
|
|
#include <stdint.h>
|
|
|
|
double frexp(double x, int *e)
|
|
{
|
|
union { double d; uint64_t i; } y = { x };
|
|
int ee = y.i>>52 & 0x7ff;
|
|
|
|
if (!ee) {
|
|
if (x) {
|
|
x = frexp(x*0x1p64, e);
|
|
*e -= 64;
|
|
} else *e = 0;
|
|
return x;
|
|
} else if (ee == 0x7ff) {
|
|
return x;
|
|
}
|
|
|
|
*e = ee - 0x3fe;
|
|
y.i &= 0x800fffffffffffffull;
|
|
y.i |= 0x3fe0000000000000ull;
|
|
return y.d;
|
|
}
|