1. MIPS Instruction Fields
op (6비트, opcode that specifies the operation)
rs (5비트, first source operand 주소)
rt (5비트, second source operand 주소)
rd (5비트, destination register 주소)
shamt (5비트, shift amount)
funct (6비트, function code)2. R-format instruction
• add rd, rs, rt
add $t0, $s1, $s2 (t0 = s1 + s2)
add -> opcode, funct
$s1 -> rs
$s2 -> rt
$t0 -> rd
sa -> 0
• sub rd, rs, rt
sub $t2, $s3, $s4 (t2 = s3 - s4)