Intro to MIPS Assembly Language

Let's Start with Addition

a = b + c;

add a, b, c

• This is general format for MIPS add instruction (and sub instruction), but what are variables a, b, and c?
• add and sub instructions always acts on registers
• Let's assume variables a, b, c, d, e have been put in $s0, $s1, $s2, $s3, $s4
• add a, b, c should be add $s0, $s1, $s2

---

• Operands always have to be in registers?
  • There is also an addi instruction (but not a subi instruction) that adds an immediately following constant.

a = b + 4;

addi $s0, $s1, 4