More Arithmetic

What is MIPS code for a = b + c + d + e?

    add $s0, $s1, $s2   # a = b + c
    add $s0, $s0, $s3   # a = a + d
    add $s0, $s0, $s4   # a = a + e

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What is MIPS code for a = (b + c) - (d + e)?

    add $t0, $s1, $s2   # $t0 = b + c
    add $t1, $s3, $s4   # $t1 = d + e
    sub $s0, $t0, $t1   # a = $t0 - $t1

Registers $s0 - $s7 are used for variables from your program.
Example: a, b, c

Registers $t0 - $t9 are used for temporary, intermediate values.
Example: (b + c)

What is MIPS code for a += b?

    add $s0, $s0, $s1   # a = a + b

Alyce Brady, Kalamazoo College