What is the value stored in register %rbx by the execution of the following program?

.pos 0x0
irmovq a, %rbx
irmovq b, %rcx
mrmovq (%rbx), %rbx
mrmovq (%rcx), %rcx
subq %rbx, %rcx # %rcx - %rbx
cmovne %rcx, %rbx
halt
.align 8
a: .quad 3
b: .quad 8

answer:

y

explanation:

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answer; i believe the correct answer is 50 pounds;