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MIPS 指令集(共31条）
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) 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) if (rs < rt) rd=1 else rd=0 ；其中rs＝$2，rt=$3, rd=$1 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， 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 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 rt rd 00000 000111 srav $1,$2,$3 $1=$2>>$3 rd <- rt >> rs ；(arithmetic) 注意符号位保留 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 lw 100011 rs rt immediate lw $1,10($2) $1=memory[$2 rt <- memory[rs + (sign-extend)immediate] ；rt=$1,rs=$2 sw 101011 rs rt immediate sw $1,10($2) memory[$2+10] memory[rs + (sign-extend)immediate] <- rt ；rt=$1,rs=$2 beq 000100 rs rt immediate beq $1,$2,10 if($1==$2) if (rs == rt) PC <- PC+4 + (sign-extend)immediate<<2 bne 000101 rs rt immediate bne $1,$2,10 if($1!=$2) if (rs != rt) PC <- PC+4 + (sign-extend)immediate<<2 slti 001010 rs rt immediate slti $1,$2,10 if($2<10) if (rs <(sign-extend)immediate) rt=1 else rt=0 ； sltiu 001011 rs rt immediate sltiu $1,$2,10 if($2<10) if (rs <(zero-extend)immediate) rt=1 else rt=0 ； 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; $31<-PC+4；PC <- (PC+4)[31..28],address,0,0 |
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