/*
 *	Copyright (c) 2024 Scott Duensing, scott@kangaroopunch.com
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 *	SOFTWARE.
 */


#include "math.h"


int16_t mathSignedDivision(int16_t a, int16_t b, int16_t *remainder) {
	byte    signA = 0;  // Zero indicates positive.
	byte    signB = 0;
	int16_t r;

	if (a < 0) {
		signA = 1;
		a = -a;
	}
	if (b < 0) {
		signB = 1;
		b = -b;
	}

	POKEW(DIVU_NUM_L, a);
	POKEW(DIVU_DEN_L, b);
	r = PEEKW(QUOU_LL);
	*remainder = PEEKW(REMU_HL);

	if (signA + signB == 1) r = -r;

	return r;
}


int32_t mathSignedMultiply(int16_t a, int16_t b) {
	byte    signA = 0;  // Zero indicates positive.
	byte    signB = 0;
	int32_t r;

	if (a < 0) {
		signA = 1;
		a = -a;
	}
	if (b < 0) {
		signB = 1;
		b = -b;
	}

	POKEW(MULU_A_L, a);
	POKEW(MULU_B_L, b);
	r = PEEKD(MULU_LL);

	if (signA + signB == 1) r = -r;

	return r;
}


uint16_t mathUnSignedDivision(uint16_t a, uint16_t b, uint16_t *remainder) {
	POKEW(DIVU_NUM_L, a);
	POKEW(DIVU_DEN_L, b);
	*remainder = PEEKW(REMU_HL);
	return PEEKW(QUOU_LL);
}


uint32_t mathUnsignedMultiply(uint16_t a, uint16_t b) {
	POKEW(MULU_A_L, a);
	POKEW(MULU_B_L, b);
	return PEEKD(MULU_LL);
}