/*
 * Source file for floating point operations.
 * 
 * CAR (Cool ARM Ripoff) copyright (c) 2026 David J Goeke. All rights reserved.
 * Unauthorized (re)distribution is prohibited.
*/

// This is mostly just wrappers around the hardware/system FPU.
// We don't do any calculations ourselves.

#include "include/defs.h"

DEFINE_OP(fp_add)
{
	register_instruction_t i = convert_raw2register(ri);
	
	uint8_t dest = i.dest;
	uint8_t src1 = i.src1;
	uint8_t src2 = i.src2;
	
	state->gprs[dest] = (uint32_t) ((float) state->gprs[src1] + (float) state->gprs[src2]);
	
	OP_RETURN_NORMAL
}

DEFINE_OP(fp_sub)
{
	register_instruction_t i = convert_raw2register(ri);
	
	uint8_t dest = i.dest;
	uint8_t src1 = i.src1;
	uint8_t src2 = i.src2;
	
	state->gprs[dest] = (uint32_t) ((float) state->gprs[src1] - (float) state->gprs[src2]);
	
	OP_RETURN_NORMAL
}

DEFINE_OP(fp_mul)
{
	register_instruction_t i = convert_raw2register(ri);
	
	uint8_t dest = i.dest;
	uint8_t src1 = i.src1;
	uint8_t src2 = i.src2;
	
	state->gprs[dest] = (uint32_t) ((float) state->gprs[src1] * (float) state->gprs[src2]);
	
	OP_RETURN_NORMAL
}

DEFINE_OP(fp_div)
{
	register_instruction_t i = convert_raw2register(ri);
	
	uint8_t dest = i.dest;
	uint32_t src1 = state->gprs[i.src1];
	uint32_t src2 = state->gprs[i.src2];
	
	if (src1 != 0 && src2 != 0)
	{
		state->gprs[dest] = (uint32_t) ((float) src1 / (float) src2);
		OP_RETURN_NORMAL
	}
	
	state->gprs[dest] = 0xffffffff;
	
	OP_RETURN_NORMAL
}

DEFINE_OP(fp_mod)
{
	register_instruction_t i = convert_raw2register(ri);
	
	uint8_t dest = i.dest;
	uint32_t src1 = state->gprs[i.src1];
	uint32_t src2 = state->gprs[i.src2];
	
	if (src1 != 0 && src2 != 0)
	{
		state->gprs[dest] = (uint32_t) ((float) src1 / (float) src2);
		OP_RETURN_NORMAL
	}
	
	state->gprs[dest] = 0xffffffff;
	
	OP_RETURN_NORMAL
}