Tailoring the ALU to the MIPS

• Need to support the set-on-less-than instruction (slt)

  • remember: slt is an arithmetic instruction
  • produces a 1 if rs < rt and 0 otherwise
  • use subtraction: (a-b) < 0 implies a < b

• Need to support test for equality (beq $t5, $t6, $t7)

  • use subtraction: (a-b) = 0 implies a = b

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