计算机系统MiniSys的各条指令.pdf

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1、MiniSys的31条指令助记符指令格式示例示例含义操作及解释BIT#31..2625..2120..1615..1110..65..0R-类型oprsrtrdshamtfuncadd000000rsrtrd00000100000add$1,$2,$3$1=$2+S3(rd)←(rs)+(rt);rs=$2,rt=$3,rd=$1addu000000rsrtrd00000100001addu$1,$2,$3$1=$2+S3(rd)←(rs)+(rt);rs=$2,rt=$3,rd=$1,无符号数sub000000rsrtrd00000100010sub$1,$2,$3$1=$2-S3(rd)←

2、(rs)-(rt);rs=$2,rt=$3,rd=$1subu000000rsrtrd00000100011subu$1,$2,$3$1=$2-S3(rd)←(rs)-(rt);rs=$2,rt=$3,rd=$1,无符号数and000000rsrtrd00000100100and$1,$2,$3$1=$2&S3(rd)←(rs)&(rt);rs=$2,rt=$3,rd=$1or000000rsrtrd00000100101or$1,$2,$3$1=$2

3、S3(rd)←(rs)

4、(rt);rs=$2,rt=$3,rd=$1xor000000rsrtrd00000100110xor$1,$2,$3

5、$1=$2^S3(rd)←(rs)^(rt);rs=$2,rt=$3,rd=$1nor000000rsrtrd00000100111nor$1,$2,$3$1=~($2

6、S3)(rd)←~((rs)

7、(rt));rs=$2,rt=$3,rd=$1if($2<$3)slt000000rsrtrd00000101010slt$1,$2,$3$1=1elseif(rs

8、$1,$2,$3$1=1else无符号数$1=0sll00000000000rtrdshamt000000sll$1,$2,10$1=$2<<10(rd)←(rt)<>shamt,rt=$2,rd=$1,shamt=10,srl00000000000rtrdshamt000010srl$1,$2,10$1=$2>>10(逻辑右移)(rd)←(rt)>>shamt,rt=$2,rd=$1,shamt=10,sra00000000000rtrdshamt000011sra$1,$2,10$1=$2>>10(算术右移，注意符号

9、位保留)sllv000000rsrtrd00000000100sllv$1,$2,$3$1=$2<<$3(rd)←(rt)<<(rs),rs=$3,rt=$2,rd=$1srlv000000rsrtrd00000000110srlv$1,$2,$3$1=$2>>$3(rd)←(rt)>>(rs),rs=$3,rt=$2,rd=$1,(逻辑右移)(rd)←(rt)>>(rs),rs=$3,rt=$2,rd=$1,(算术右移，srav000000rsrtrd00000000111srav$1,$2,$3$1=$2>>$3注意符号位保留)jr000000rs000000000000000001000

10、jr$31goto$31(PC)←(rs)I-类型oprsrtimmediateaddi001000rsrtimmediateaddi$1,$2,10$1=$2+10(rt)←(rs)+(sign-extend)immediate,rt=$1,rs=$2addiu001001rsrtimmediateaddiu$1,$2,10$1=$2+10(rt)←(rs)+(sign-extend)immediate,rt=$1,rs=$2andi001100rsrtimmediateandi$1,$2,10$1=$2&10(rt)←(rs)&(zero-extend)immediate,rt=$1,rs

11、=$2ori001101rsrtimmediateori$1,$2,10$1=$2

12、10(rt)←(rs)

13、(zero-extend)immediate,rt=$1,rs=$2xori001110rsrtimmediatexori$1,$2,10$1=$2^10(rt)←(rs)^(zero-extend)immediate,rt=$1,rs=$2(rt)←immediate<<16&0FFFF0