#include <stdint.h>
#include <float.h>
#include <math.h>

#include "internal/libm.h"

#define EPS DBL_EPSILON

static const double toint = 1/EPS;

double ceil(double x)
{
	union {double f; uint64_t i;} u = {x};
	int e = u.i >> 52 & 0x7ff;
	double y;

	if (e >= 0x3ff+52 || x == 0)
		return x;
	
    if (u.i >> 63) {
		y = x - toint + toint - x;
    } else {
		y = x + toint - toint - x;
    }

    if (e <= 0x3ff-1) {
		FORCE_EVAL(y);
		return u.i >> 63 ? -0.0 : 1;
	}
	
    if (y < 0)
		return x + y + 1;
	return x + y;
}

float ceilf(float x) {
	union {float f; uint32_t i;} u = {x};
	int e = (int)(u.i >> 23 & 0xff) - 0x7f;
	uint32_t m;

	if (e >= 23)
		return x;
	if (e >= 0) {
		m = 0x007fffff >> e;
		if ((u.i & m) == 0)
			return x;
		FORCE_EVAL(x + 0x1p120f);
		if (u.i >> 31 == 0)
			u.i += m;
		u.i &= ~m;
	} else {
		FORCE_EVAL(x + 0x1p120f);
		if (u.i >> 31)
			u.f = -0.0;
		else if (u.i << 1)
			u.f = 1.0;
	}
	return u.f;
}