lib/libm/trunc.c


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#include "libm.h" // for FORCE_EVAL

#include <math.h>   // for trunc
#include <stdint.h> // for uint64_t

double trunc(double x)
{
	union {
		double f;
		uint64_t i;
	} u = { x };
	int e = (int)(u.i >> 52 & 0x7ff) - 0x3ff + 12;
	uint64_t m;

	if (e >= 52 + 12)
		return x;
	if (e < 12)
		e = 1;
	m = -1ULL >> e;
	if ((u.i & m) == 0)
		return x;
	FORCE_EVAL(x + 0x1p120f);
	u.i &= ~m;
	return u.f;
}