The set instructions read the condition codes and store a byte 1 or byte 0 in the destination operand.

 typedef intdata_t;
 #define COMP <

 int comp(data_t a, data_t b)
 {
    return a COMP b;
 }
   

Assum a is in %edx and b is in %eax

1.           cmpl %eax, %edx
             setl %al
             movzbl %al, %eax
          
   

2.           cmpw %ax, %dx
             setge %al
             movzbl %al, %eax
          
   

3.           cmpl %al, %dl
             setb %al
             movzbl %al, %eax
          
   

4.           cmpl %eax, %edx
             setne %al
             movzbl %al, %eax