#pragma GCC optimize "-O0"
#pragma GCC optimize "Og"
#include <ArduinoTrace.h>
volatile uint8_t a[3]={2,3,4},b=5,i=1; 


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  i=2;
  b=0;

  //------------------- PROCESO --------------------------//

  // for(i=0; i<3; i++){
  //   b=b+a[i];
  // }
  // i = 0;
  // while(i < 3){
  //   b=b+a[i];
  //   i++;
  // }
  //----------------------------------------------------- //
  //------------- Proceso en lenguaje ensamblador ----------//
  // // for convertido en while
  // i = 0;
  asm volatile(
  "ldi r18, 0 \n"
  "sts i, r18 \n"
  );

  // while(i < 3)
  asm volatile("init: ");
  asm volatile(
    "lds r18, i \n"
    "cpi r18, 3 \n" //r18-3 <--> i - 3
    "brlo body \n"  //i < 3
    "rjmp end \n"
  );

  asm volatile("body: ");
  // b=b+a[i];
  asm volatile(
    "lds r18, b \n" //r18 <-- (b)
    "lds r20, i \n"
    "ldi r21, 0 \n" //r21:r20 <-- (i) en 16 bits
    "subi r20, lo8(-(a)) \n"
    "sbci r21, hi8(-(a)) \n" //r21:r20 <-- dirección de a[i]
    "movw zl, r20 \n" //Z <-- dir de a[i]
    "ld r19, Z \n"  //r19 <-- (a[i])
    "add r18, r19 \n" //r18 <-- (b) + (a[i])
    "sts b, r18 \n" //b <-- (b) + (a[i])
  );
  //  i++;
  asm volatile(
    "lds r18, i \n"
    "inc r18 \n" //i++
    "sts i, r18 \n"
  );

  asm volatile("rjmp init");
  asm volatile("end: ");
  //----------------------------------------------------- //

  for(int j=0;j<3;j++)
  {
    Serial.print("a[");
    Serial.print(j);
    Serial.print("] = ");
    Serial.println(a[j]);
  }

  Serial.println();
  Serial.print("b = ");
  Serial.println(b);

//Al usar punto podemos ejecutar funciones miembros
}

void loop() {
  // put your main code here, to run repeatedly:

}