while at it, there should be two mov and two xrl here:

mov a, temp1lo
xrl a, temp2lo
jnz proceed
xrl a, temp1hi <- mov a,temp1hi
xrl a, temp2hi
jnz proceed



I guess this one is a little late because Jan was there earlier:

#include <8051.h>
unsigned char __xdata *temp1;
unsigned char __xdata *temp2;

void main(void)
{
    do
    {
        P3 = *temp1++; // just to do something
    }
    while (temp1 != temp2);
}

compiles to:

   0064                     330 00101$:

                                        ...


                            341 ;       equ.c:11: while (temp1 != temp2);
   0075 E5 08               342         mov     a,_temp1
   0077 B5 0A EA            343         cjne    a,_temp2,00101$
   007A E5 09               344         mov     a,(_temp1 + 1)
   007C B5 0B E5            345         cjne    a,(_temp2 + 1),00101$