#pragma GCC optimize "-Og"
#include "ArduinoTrace.h"

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  PORTD=PORTD|(1<<PD4);        //board pin 4 pull-up resistor
  DDRB=DDRB|(1<<PB0);          //led pin output
}

void loop() {
  // put your main code here, to run repeatedly:
  // if((PIND&0x10)==0)         //si pulsador oprimido (bit 4 de PIND en 0)   
  // {
  //   PORTB=PORTB|(1<<PB0);    //led on
  // }
  // else                       //sino:
  // {
  //   PORTB=PORTB&~(1<<PB0);   //led off
  // }

  // if((PIND&0x10)==0)
  // {
  //   goto L10;
  // }
  // else
  // {
  //   goto L20;
  // }

  asm goto
  (
    "sbis %0,4 \n"
    "rjmp %l[L10] \n"
    "rjmp %l[L20]"
    :
    :"I"(_SFR_IO_ADDR(PIND))
    :
    :L10,L20
  );

  L10:
  //PORTB=PORTB|(1<<PB0); 
  asm volatile
  (
    "sbi %0,0"
    :
    :"I"(_SFR_IO_ADDR(PORTB))
    :
  );

  //goto L30;
  asm goto
  (
    "rjmp %l[L30]"
    ::::L30
  );

  L20:
  //PORTB=PORTB&~(1<<PB0);
  asm volatile
  (
    "cbi %0,0"
    :
    :"I"(_SFR_IO_ADDR(PORTB))
    :
  );
  L30:

  delay(100);
}