How to set a variable in GCC with Intel syntax inline assembly?

Question

Why doesn\'t this code set temp to 1? How do I actually do that?

int temp;
__asm__(
    \".intel_syntax;\"
    \"mov %0, eax;\"
    \"mov eax, %         


        

Answer 1

You want temp to be an output, not an input, I think. Try:

  __asm__(
      ".intel_syntax;"
      "mov eax, %1;"
      "mov %0, eax;"
      ".att_syntax;"
      : "=r"(temp)
      : "r"(1) 
      : "eax");