MIPS Addressing Modes

Audio version available in www.youtube.com/Aksharam
subscribe the channal

Computer Architecture and Organization
V semester
Anna University
By
Babu M, Assistant Professor
Department of ECE
RMK College of Engineering and Technology
Chennai

1. MIPS ADDRESSING MODES Immediate Addressing Mode Register Addressing Mode Base or Displacement Addressing Mode PC-Relative Addressing Mode Pseudo Direct Addressing Mode

2. Immediate Addressing Mode Eg:1. addi $s0, $zero,7 Eg:4. ori $t0,$ t1,8 $s0 = 0 + 7 $t0 = $t1 | 8

3. Register Addressing Mode Eg:1. add $s1,$s2,$s3 Eg:2. or $t0,$t1 ,$t2 Eg:3. srl $s7,$s0,4 $s1 = $s2 + $s3 $t0 = $t1 + $t2 $s7 = $s0 >> 4

4. Base / Displacement Addressing Mode Eg:1. lw $s1 , 4($s2) Eg:2. sw $s0, 8($s4) $s1 = Mem [$s2+4] Mem [$s4+8] = $s0

5. PC – Relative Addressing Mode Eg:1. beq $s1 , $s2, 25 Eg:2. bne $s0 , $ s1 , 20 if($s1==$s2) goto PC+4+100 if($s0!=$s1) goto PC+4+80

6. Pseudo Direct Addressing Mode Eg:1. j 2500 Eg:2. jr $ ra Eg:3. jal 2500 go to 10000 goto $ ra $ ra =PC+4 goto 10000

7. EXAMPLE Loop: add $t1,$s3,$s3 add $t1 ,$t1,$t1 add $t1,$t1 ,$s6 lw $ t0,0($t 1 ) bne $t0 ,$s5,Exit add $ s3,$s3,$s 4 j loop Exit: 35 9 8 19 19 9 32 5 8 21 2 2 2000 8000 8004 8008 9 9 9 32 9 22 9 32 19 20 19 32 8012 8016 8020 8024 8028 Starting address 8000

8. 0000 0000 0001 0000 0101 0001 0000 0000 0000 0000 0001 0000 0101 0001 0000 0000 00000000000100000101000100000000 000000 00000100000101000100000000 R - Type 000000 00000100000101000100 000000 sll 000000 00000 10000 01010 00100 000000 sll $t2, op rs rt rd Shift amt fn $s0, 4 0x00105100 00105100 hex