Hi, I'm trying to find out the right way to pass an array variable as address into an Inline Assembly block as Input Constraint. Test Program: #include int array[3] = {111, 222, 333}; int main(void) { int out = 0; asm( ".intel_syntax noprefix \n\t" "lea eax, %[array] \n\t" "mov eax,[eax] \n\t" "inc eax \n\t" ".intel_syntax prefix \n\t" : "=a" (out) : [array] "m" (*array) ); printf("out = %i\n", out); return 0; } Compiling on i386 machine, it worked: COMMAND LINE: gcc -fPIC -DPIC -masm=intel prog_i386 prog_i386.c ASSEMBLY: mov %eax, DWORD PTR array@GOT[%ebx] #APP .intel_syntax noprefix lea eax, DWORD PTR [%eax] Compiling on x86_64 machine, it didn't work: COMMAND LINE: gcc -fPIC -DPIC -masm=intel -o prog_x86_64 prog_x86_64.c ERROR: /tmp/cc7z5OHz.s: Assembler messages: /tmp/cc7z5OHz.s:27: Error: invalid operand for 'mov' ('(' unexpected) /tmp/cc7z5OHz.s:38: Error: invalid operand for 'lea' ('(' unexpected) ASSEMBLY: mov %rax, QWORD PTR array@GOTPCREL(%rip) #APP .intel_syntax noprefix lea rax, DWORD PTR [%rax] I am hoping for a solution that is good for both compiling with -fPIC or not, if possible. What is the right way to pass an array variable into Inline Assembly? http://gcc.gnu.org/onlinedocs/gccint/Simple-Constraints.html#Simple-Constraints Is there any other constraint that I should be using instead? Thanks for your advice! -- Daniel Yek.