/* mactest2.c - An example of using inline assembly macros in a program */#include <stdio.h>#define GREATER(a, b, result) ({ \    asm("cmp %1, %2\n\t" \        "jge 0f\n\t" \        "movl %1, %0\n\t" \        "jmp 1f\n\t" \        "0:\n\t" \        "movl %2, %0\n\t" \        "1:" \        :"=r"(result) \        :"r"(a), "r"(b)); })int main(){   int data1 = 10;   int data2 = 20;   int result;   GREATER(data1, data2, result);   printf("a = %d, b = %d    result: %d\n", data1, data2, result);   data1 = 30;   GREATER(data1, data2, result);   printf("a = %d, b = %d    result: %d\n", data1, data2, result);   return 0;}