5.40 · exercise

Fill in the Blank: Binary Arithmetic

Fill in the missing mnemonics and condition codes so each instruction performs the arithmetic or the unsigned branch described.

0 of 5 correct

Branch to endif when the earlier cmp found the first operand greater than or equal to the second, comparing both as unsigned values.

b. endif

Add x19, x22, and the current Carry flag into x25, leaving the condition flags unchanged.

x25, x19, x22

Add x21 and x24 into x27 and update the condition flags so a following adc can pick up the carry out.

x27, x21, x24

Subtract x2 from x1 into x0 without changing the condition flags.

x0, x1, x2

Branch to done when the earlier cmp found the first operand strictly greater than the second, comparing both as unsigned values.

b. done