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Computer Architecture Cheat Sheet (DRAFT) by

This is a draft cheat sheet. It is a work in progress and is not finished yet.

ADD – Add (with overflow)

Operation: $d = $s + $t; advance_pc (4);
Syntax: add $d, $s, $t
Encoding: 0000 00ss ssst tttt dddd d000 0010 0000

ADDI -- Add immediate (with overflow)

Operation: $t = $s + imm; advance_pc (4);
Syntax: addi $t, $s, imm
Encoding: 0010 00ss ssst tttt iiii iiii iiii iiii

ADDIU -- Add immediate unsigned (no overflow)

Operation: $t = $s + imm; advance_pc (4);
Syntax: addiu $t, $s, imm
Encoding: 0010 01ss ssst tttt iiii iiii iiii iiii

ADDIU -- Add immediate unsigned (no overflow)

Operation:  $t = $s + imm; advance_pc (4);  
Syntax:  addiu $t, $s, imm  
Encoding:  0010 01ss ssst tttt iiii iiii iiii iiii

ADDU -- Add unsigned (no overflow)

Operation:  $d = $s + $t; advance_pc (4);  
Syntax:  addu $d, $s, $t  
Encoding:  0000 00ss ssst tttt dddd d000 0010 0001

AND -- Bitwise and

Operation:  $d = $s & $t; advance_pc (4);  
Syntax:  and $d, $s, $t  
Encoding:  0000 00ss ssst tttt dddd d000 0010 0100

ANDI -- Bitwise and immediate

Operation:  $t = $s & imm; advance_pc (4);  
Syntax:  andi $t, $s, imm  
Encoding:  0011 00ss ssst tttt iiii iiii iiii iiii

ANDI -- Bitwise and immediate

Operation:  $t = $s & imm; advance_pc (4);  
Syntax:  andi $t, $s, imm  
Encoding:  0011 00ss ssst tttt iiii iiii iiii iiii

BEQ -- Branch on equal

Operation:  if $s == $t advance_pc (offset << 2)); else advance_pc (4);  
Syntax:  beq $s, $t, offset  
Encoding:  0001 00ss ssst tttt iiii iiii iiii iiii

BGEZ -- Branch on greater than or equal to zero

Operation:  if $s >= 0 advance_pc (offset << 2)); else advance_pc (4);  
Syntax:  bgez $s, offset  
Encoding:  0000 01ss sss0 0001 iiii iiii iiii iiii

BGEZAL -- Branch on greater than or

equal to zero and link
Operation:  if $s >= 0 $31 = PC + 8 (or nPC + 4); advance_pc (offset << 2)); else advance_pc (4);  
Syntax:  bgezal $s, offset  
Encoding:  0000 01ss sss1 0001 iiii iiii iiii iiii
 

BGTZ -- Branch on greater than zero

Operation:  if $s > 0 advance_pc (offset << 2)); else advance_pc (4);  
Syntax:  bgtz $s, offset  
Encoding:  0001 11ss sss0 0000 iiii iiii iiii iiii

BLEZ -- Branch on less than or equal to zero

Operation: if $s <= 0 advance_pc (offset << 2)); else advance_pc (4);
Syntax: blez $s, offset
Encoding: 0001 10ss sss0 0000 iiii iiii iiii iiii

BLTZ -- Branch on less than zero

Operation: if $s < 0 advance_pc (offset << 2)); else advance_pc (4);
Syntax: bltz $s, offset
Encoding: 0000 01ss sss0 0000 iiii iiii iiii iiii

BLTZAL -- Branch on less than zero and link

Operation: if $s < 0 $31 = PC + 8 (or nPC + 4); advance_pc (offset << 2)); else advance_pc (4);
Syntax: bltzal $s, offset
Encoding: 0000 01ss sss1 0000 iiii iiii iiii iiii

BLTZAL -- Branch on less than zero and link

Operation: if $s < 0 $31 = PC + 8 (or nPC + 4); advance_pc (offset << 2)); else advance_pc (4);
Syntax: bltzal $s, offset
Encoding: 0000 01ss sss1 0000 iiii iiii iiii iiii