/* regtest2.c - An example of using placeholders */#include <stdio.h>int main(){   int data1 = 10;   int data2 = 20;   int result;   asm ("imull %1, %2\n\t"        "movl %2, %0"        : "=r"(result)        : "r"(data1), "r"(data2));   printf("The result is %d\n", result);   return 0;}