How use "asm" in C++ ?

Hi, I have some problem when I'm using 'asm' in C++.
I need to find max value in array, I wrote the code but it doesn't compare.

What I have tried:

void func1(int x[],int lenght){ // Find MAX 
    
    int max, z = x[0]; //Make first elem is MAX
    
    __asm__ volatile 
        (   
            "movl %1, %%eax;"
            "movl %%eax, %0;"
            : "=r" ( max )        
            : "r" ( z )         
            : "%eax" 
        );

    
    for(int i = 1 ; i < lenght; i++) //From second element to end
    {
        __asm__ volatile
        (   
            "movl %1, %%ebx;" // Move x[i] to EBX
            "cmpl %%ebx,%%eax;" 
            "jl DONE;"// If EAX less EBX JUMP to 'DONE'
            "DONE: movl %%ebx,%%eax;" // MOVE EBX to EAX
            "movl %%eax , %0" // MOVE EAX to 'max'
            :"=r"(max)
            :"r"(x[i])
        );
    }

    cout << "MAX" << endl;
    cout << max << endl;
}

Tags: C++, ASM