Assembler error, SoftwareSerial, add even parity bit

Projects Programming
6

It doesn't look related but change tunedDelay() the following routine:

/* static */ 
inline void SoftwareSerial7e1::tunedDelay(volatile uint16_t delay) { 
  volatile uint8_t tmp=0;
  asm volatile("sbiw    %0, 0x01 \n\t"
    "ldi %1, 0xFF \n\t"
    "cpi %A0, 0xFF \n\t"
    "cpc %B0, %1 \n\t"
    "brne .-10 \n\t"
    : "+r" (delay), "+a" (tmp)
    : "0" (delay)
    );
    
}

Note the added volatile statements. For me it compiles so.