#include "hwo/fixpoint.h"

/* fp_asin()	returns: -90..+90 */
fixpoint_t fp_asin(fixpoint_t sin)
{
	if ((sin == 0) || (sin > fp_make(1)))
		return 0;
	if (sin == fp_make(1))
		return fp_make(90);
	if (sin == fp_make(-1))
		return fp_make(-90);
	if (sin > 0)
		return fp_sin_lookup_reverse(sin);
	if (sin < 0)
		return -fp_sin_lookup_reverse(-sin);
	return 0;
};