MIPS 指令集(共31条）
| 助记符
| 指令格式
| 示例
| 示例含义
| 操作及其解释
| Bit #
| 31..26
| 25..21
| 20..16
| 15..11
| 10..6
| 5..0
|
|
|
| R-type
| op
| rs
| rt
| rd
| shamt
| func
|
|
|
| add
| 000000
| rs
| rt
| rd
| 00000
| 100000
| add $1,$2,$3
| $1=$2+$3
| rd <- rs + rt ；其中rs＝$2，rt=$3, rd=$1
| addu
| 000000
| rs
| rt
| rd
| 00000
| 100001
| addu $1,$2,$3
| $1=$2+$3
| rd <- rs + rt ；其中rs＝$2，rt=$3, rd=$1,无符号数
| sub
| 000000
| rs
| rt
| rd
| 00000
| 100010
| sub $1,$2,$3
| $1=$2-$3
| rd <- rs - rt ；其中rs＝$2，rt=$3, rd=$1
| subu
| 000000
| rs
| rt
| rd
| 00000
| 100011
| subu $1,$2,$3
| $1=$2-$3
| rd <- rs - rt ；其中rs＝$2，rt=$3, rd=$1,无符号数
| and
| 000000
| rs
| rt
| rd
| 00000
| 100100
| and $1,$2,$3
| $1=$2 & $3
| rd <- rs & rt ；其中rs＝$2，rt=$3, rd=$1
| or
| 000000
| rs
| rt
| rd
| 00000
| 100101
| or $1,$2,$3
| $1=$2 | $3
| rd <- rs | rt ；其中rs＝$2，rt=$3, rd=$1
| xor
| 000000
| rs
| rt
| rd
| 00000
| 100110
| xor $1,$2,$3
| $1=$2 ^ $3
| rd <- rs xor rt ；其中rs＝$2，rt=$3, rd=$1(异或）
| nor
| 000000
| rs
| rt
| rd
| 00000
| 100111
| nor $1,$2,$3
| $1=~($2 | $3)
| rd <- not(rs | rt) ；其中rs＝$2，rt=$3, rd=$1(或非）
| slt
| 000000
| rs
| rt
| rd
| 00000
| 101010
| slt $1,$2,$3
| if($2<$3)
$1=1 else
$1=0
| if (rs < rt) rd=1 else rd=0 ；其中rs＝$2，rt=$3, rd=$1
| sltu
| 000000
| rs
| rt
| rd
| 00000
| 101011
| sltu $1,$2,$3
| if($2<$3)
$1=1 else
$1=0
| if (rs < rt) rd=1 else rd=0 ；其中rs＝$2，rt=$3, rd=$1
(无符号数）
| sll
| 000000
| 00000
| rt
| rd
| shamt
| 000000
| sll $1,$2,10
| $1=$2<<10
| rd <- rt << shamt ；shamt存放移位的位数，
也就是指令中的立即数，其中rt=$2, rd=$1
| srl
| 000000
| 00000
| rt
| rd
| shamt
| 000010
| srl $1,$2,10
| $1=$2>>10
| rd <- rt >> shamt ；(logical) ，其中rt=$2, rd=$1
| sra
| 000000
| 00000
| rt
| rd
| shamt
| 000011
| sra $1,$2,10
| $1=$2>>10
| rd <- rt >> shamt ；(arithmetic) 注意符号位保留
其中rt=$2, rd=$1
| sllv
| 000000
| rs
| rt
| rd
| 00000
| 000100
| sllv $1,$2,$3
| $1=$2<<$3
| rd <- rt << rs ；其中rs＝$3，rt=$2, rd=$1
| srlv
| 000000
| rs
| rt
| rd
| 00000
| 000110
| srlv $1,$2,$3
| $1=$2>>$3
| rd <- rt >> rs ；(logical)其中rs＝$3，rt=$2, rd=$1
| srav
| 000000
| rs
4000
| rt
| rd
| 00000
| 000111
| srav $1,$2,$3
| $1=$2>>$3
| rd <- rt >> rs ；(arithmetic) 注意符号位保留
其中rs＝$3，rt=$2, rd=$1
| jr
| 000000
| rs
| 00000
| 00000
| 00000
| 001000
| jr $31
| goto $31
| PC <- rs
| I-type
| op
| rs
| rt
| immediate
|
|
|
| addi
| 001000
| rs
| rt
| immediate
| addi $1,$2,100
| $1=$2+100
| rt <- rs + (sign-extend)immediate ；其中rt=$1,rs=$2
| addiu
| 001001
| rs
| rt
| immediate
| addiu $1,$2,100
| $1=$2+100
| rt <- rs + (zero-extend)immediate ；其中rt=$1,rs=$2
| andi
| 001100
| rs
| rt
| immediate
| andi $1,$2,10
| $1=$2 & 10
| rt <- rs & (zero-extend)immediate ；其中rt=$1,rs=$2
| ori
| 001101
| rs
| rt
| immediate
| andi $1,$2,10
| $1=$2 | 10
| rt <- rs | (zero-extend)immediate ；其中rt=$1,rs=$2
| xori
| 001110
| rs
| rt
| immediate
| andi $1,$2,10
| $1=$2 ^ 10
| rt <- rs xor (zero-extend)immediate ；其中rt=$1,rs=$2
| lui
| 001111
| 00000
| rt
| immediate
| lui $1,100
| $1=100*65536
| rt <- immediate*65536 ；将16位立即数放到目标寄存器高16
位，目标寄存器的低16位填0
| lw
| 100011
| rs
| rt
| immediate
| lw $1,10($2)
| $1=memory[$2
+10]
| rt <- memory[rs + (sign-extend)immediate] ；rt=$1,rs=$2
| sw
| 101011
| rs
| rt
| immediate
| sw $1,10($2)
| memory[$2+10]
=$1
| memory[rs + (sign-extend)immediate] <- rt ；rt=$1,rs=$2
| beq
| 000100
| rs
| rt
| immediate
| beq $1,$2,10
| if($1==$2)
goto PC+4+40
| if (rs == rt) PC <- PC+4 + (sign-extend)immediate<<2
| bne
| 000101
| rs
| rt
| immediate
| bne $1,$2,10
| if($1!=$2)
goto PC+4+40
| if (rs != rt) PC <- PC+4 + (sign-extend)immediate<<2
| slti
| 001010
| rs
| rt
| immediate
| slti $1,$2,10
| if($2<10)
$1=1 else
$1=0
| if (rs <(sign-extend)immediate) rt=1 else rt=0 ；
其中rs＝$2，rt=$1
| sltiu
| 001011
| rs
| rt
| immediate
| sltiu $1,$2,10
| if($2<10)
$1=1 else
$1=0
| if (rs <(zero-extend)immediate) rt=1 else rt=0 ；
其中rs＝$2，rt=$1
| J-type
| op
| address
|
|
|
| j
| 000010
| address
| j 10000
| goto 10000
| PC <- (PC+4)[31..28],address,0,0 ；address=10000/4
| jal
| 000011
| address
| jal 10000
| $31<-PC+4;
goto 10000
| $31<-PC+4；PC <- (PC+4)[31..28],address,0,0
；address=10000/4
|
|
注意：因为MIPS16只有16个16位的寄存器，所以JAL指令中$31改成$15, 所有立即数均无需扩展，LUI指令直接就是将立即数付给RT寄存器。 |
