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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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29
libc/math/round.c Normal file
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#include "libc/math/libm.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 round(double x) {
union {
double f;
uint64_t i;
} u = {x};
int e = u.i >> 52 & 0x7ff;
double_t y;
if (e >= 0x3ff + 52) return x;
if (u.i >> 63) x = -x;
y = x + toint - toint - x;
if (y > 0.5) {
y = y + x - 1;
} else if (y <= -0.5) {
y = y + x + 1;
} else {
y = y + x;
}
if (u.i >> 63) y = -y;
return y;
}