.data

min:
.long 0
max:
.long 0

.text
.type max_diff,@function
.global max_diff
#rdi - a
#rsi - b
#rdx - c
#rcx - d

max_diff:
	MOV %rdi, min
	MOV %rdi, max
comp_b:
	CMP min, %rsi
	JL b_min
	MOV %rsi, max
comp_c:
	CMP min, %rdx
	JL c_min
	MOV %rdx, max
comp_d:
	CMP min, %rcx
	JL d_min
	MOV %rcx, max
exit:
	MOVL min, %eax
	MOVL max, %ebx
	SUB %eax,%ebx
	MOVL %ebx, %eax
	RET

b_min:
	MOV %rsi, min
	JMP comp_c
c_min:
	MOV %rdx, min
	JMP comp_d
d_min:
	MOV %rcx, min
	JMP exit