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This commit is contained in:
Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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31
libc/math/rint.c Normal file
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#include "libc/math/math.h"
#include "libc/str/str.h"
#if FLT_EVAL_METHOD == 0 || FLT_EVAL_METHOD == 1
#define EPS DBL_EPSILON
#elif FLT_EVAL_METHOD == 2
#define EPS LDBL_EPSILON
#endif
static const double_t toint = 1 / EPS;
double rint(double x) {
int e, s;
uint64_t i;
double_t y;
memcpy(&i, &x, 8);
e = i >> 52 & 0x7ff;
s = i >> 63;
if (e >= 0x3ff + 52) {
return x;
}
if (s) {
y = x - toint + toint;
} else {
y = x + toint - toint;
}
if (y == 0) {
return s ? -0.0 : 0;
}
return y;
}