#include <stdio.h>
#include <time.h>

#include "../include/ejit/ejit.h"

struct ejit_func *compile()
{
	struct ejit_operand args[1] = {
		EJIT_OPERAND_GPR(0, EJIT_INT64) /* loc 0 contains n */
	};
	struct ejit_func *f = ejit_create_func(EJIT_INT64, 1, args);
	struct ejit_reloc recurse = ejit_bgti(f, EJIT_GPR(0), 2); /* n <= 2 */
	ejit_reti(f, 1);

	struct ejit_label label = ejit_label(f);
	ejit_patch(f, recurse, label);

	/* fib(n - 1) */
	ejit_subi(f, EJIT_GPR(0), EJIT_GPR(0), 1);
	struct ejit_operand arg[1] = {
		EJIT_OPERAND_GPR(0, EJIT_INT64)
	};
	ejit_calli(f, f, 1, arg);
	ejit_retval(f, EJIT_GPR(1)); /* loc 1 contains temp result */

	/* fib(n - 2) */
	ejit_subi(f, EJIT_GPR(0), EJIT_GPR(0), 1);
	ejit_calli(f, f, 1, arg);
	ejit_retval(f, EJIT_GPR(0)); /* loc 0 now contains second temp result */

	ejit_addr(f, EJIT_GPR(0), EJIT_GPR(0), EJIT_GPR(1)); /* add results */
	ejit_retr(f, EJIT_GPR(0));

	bool try_jit = true;
#ifdef NOJIT
	try_jit = false;
#endif

	/* the highest location we used was 1, so we need to request 2 locations
	 * for general purpose registers in total. No floating point registers,
	 * so 0. */
	ejit_select_compile_func(f, 2, 0, true, try_jit);
	return f;
}

int main(int argc, char *argv[])
{
	if(argc != 3){
		fprintf(stderr, "Usage: %s compile_num loop_num\n", argv[0]);
		return -1;
	}

	size_t compile_num = strtoull(argv[1], 0, 0);
	struct ejit_func **info = calloc(compile_num, sizeof(struct ejit_func *));

	clock_t t = clock();
	for(size_t i = 0; i < compile_num; ++i){
		info[i] = compile();
	}
	t = clock() - t;

	double compile_time_total = ((double)t) / CLOCKS_PER_SEC;
	double compile_time_one = compile_time_total / compile_num;
	printf("Compilation for n = %lu took %fs (1/%f).\n",
			compile_num, compile_time_total, compile_time_one);

	size_t run_num = strtoull(argv[2], 0, 0);
	t = clock();
	struct ejit_arg arg[1] = {
		(struct ejit_arg){.type = EJIT_INT64, .l = run_num}
	};
	size_t result = ejit_run_func(info[0], 1, arg);
	t = clock() - t;

	double run_time_total = ((double)t) / CLOCKS_PER_SEC;
	printf("Running loop for n = %lu took %fs with res %lu\n",
			run_num, run_time_total, result);

	for(size_t i = 0; i < compile_num; ++i)
		ejit_destroy_func(info[i]);

	free(info);
	return 0;
}