changedtest.c

汇编经典教程profession_assembly_language（Richard Blum著） 的code

/* changedtest.c - An example of setting registers in the changed registers list */
#include <stdio.h>

int main()
{
   int data1 = 10;
   int result = 20;

   asm ("movl %1, %%eax\n\t"
        "addl %%eax, %0"
        : "=r"(result)
        : "r"(data1), "0"(result)
        : "%eax");

   printf("The result is %d\n", result);
   return 0;
}