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trans.cpp
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#include<bits/stdc++.h>
using namespace std;
string str(int x,int len){
string s;
for(int i=len-1;i>=0;i--)
s=s+char('0'+(x>>i&1));
return s;
}
int reg[33];
int mem[2333];
//#define OP_IMM 0010011
//#define OP_RRR 0110011
map<string,char>CMD_TYPE;
map<string,string>OP_FUN3;
int main(){
freopen("instr.txt","r",stdin);
freopen("instr.bin","w",stdout);
CMD_TYPE["addi"]='I';
CMD_TYPE["andi"]='I';
CMD_TYPE["ori"]='I';
CMD_TYPE["xori"]='I';
CMD_TYPE["add"]='R';
CMD_TYPE["sub"]='R';
CMD_TYPE["and"]='R';
CMD_TYPE["or"]='R';
CMD_TYPE["xor"]='R';
CMD_TYPE["beq"]='B';
CMD_TYPE["bne"]='B';
CMD_TYPE["blt"]='B';
CMD_TYPE["bge"]='B';
string instr;
string rd;
while(cin>>instr){
int rd,rs1,rs2,imm;
if(instr=="auipc"){
cin>>rd>>imm;
cout<<str(imm,20)+str(rd,5)+string("0010111")<<endl;
}
if(instr=="jal"){
cin>>rd>>imm;
cout<<str(imm,20)+str(rd,5)+string("1101111")<<endl;
}
if(instr=="jalr"){
cin>>rd>>rs1>>imm;
cout<<str(imm,12)+str(rs1,5)+string("000")+str(rd,5)+string("1100111")<<endl;
}
if(instr=="lui"){
cin>>rd>>imm;
cout<<str(imm,20)+str(rd,5)+string("0110111")<<endl;
}
if(instr=="lw"){
cin>>rd>>rs1>>imm;
string FUN3="010";
reg[rd]=mem[(reg[rs1]+imm)/4];
cout<<str(imm,12)+str(rs1,5)+FUN3+str(rd,5)+string("0000011")<<endl;
}
if(instr=="sw"){
cin>>rs2>>rs1>>imm;
mem[(reg[rs1]+imm)/4]=reg[rs2];
string IM=str(imm,12);/*
cerr<<IM.substr(0,7)<<endl;
cerr<<str(rs2,5)<<endl;
cerr<<str(rs1,5)<<endl;
cerr<<"010"<<endl;
cerr<<IM.substr(7,5)<<endl;
cerr<<"0100011"<<endl;*/
cout<<IM.substr(0,7)+str(rs2,5)+str(rs1,5)+"010"+IM.substr(7,5)+string("0100011")<<endl;
}
if(CMD_TYPE[instr]=='I'){
cin>>rd>>rs1>>imm;
string FUN3;
if(instr=="addi")reg[rd]=reg[rs1]+imm,FUN3="000";
if(instr=="xori")reg[rd]=reg[rs1]^imm,FUN3="100";
if(instr=="ori")reg[rd]=reg[rs1]|imm,FUN3="110";
if(instr=="andi")reg[rd]=reg[rs1]&imm,FUN3="111";
cout<<str(imm,12)+str(rs1,5)+FUN3+str(rd,5)+string("0010011")<<endl;
}
if(CMD_TYPE[instr]=='R'){
cin>>rd>>rs1>>rs2;
string FUN3;
string fun7=str(0,7);
if(instr=="add")reg[rd]=reg[rs1]+reg[rs2],FUN3="000";
if(instr=="sub")reg[rd]=reg[rs1]-reg[rs2],FUN3="000",fun7="0100000";
if(instr=="xor")reg[rd]=reg[rs1]^reg[rs2],FUN3="100";
if(instr=="or")reg[rd]=reg[rs1]|reg[rs2],FUN3="110";
if(instr=="and")reg[rd]=reg[rs1]®[rs2],FUN3="111";
cout<<fun7+str(rs2,5)+str(rs1,5)+FUN3+str(rd,5)+string("0110011")<<endl;
}
if(CMD_TYPE[instr]=='B'){
cin>>rs1>>rs2>>imm;
string FUN3;
string fun7=str(0,7);
if(instr=="beq")FUN3="000";
if(instr=="bne")FUN3="001";
if(instr=="blt")FUN3="100";
if(instr=="bge")FUN3="101";
string IM=str(imm,12);
cout<<IM.substr(0,7)+str(rs2,5)+str(rs1,5)+FUN3+IM.substr(7,5)+string("1100011")<<endl;
}
}
cerr<<"trans done"<<endl;
// for(int i=0;i<8;i++)
// fprintf(stderr,"reg[%d]=%x\n",i,reg[i]);
// for(int i=0;i<8;i++)
// fprintf(stderr,"mem[%d]=%x\n",i,mem[i]);
return 0;
}