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Copy pathApex-Simulator_2.c
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Apex-Simulator_2.c
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#include <stdio.h>
#include <stdlib.h>
#include<string.h>
#ifndef VALID
#define VALID 1
#endif
#ifndef INVALID
#define INVALID 0
#endif
long data_Memory[1000];
int pc = 0;
int line_Number = 0;
void fetch();
void decode();
void execute(); //PC value starts from '0', if 1 is desired substract 1 from pc calculations at every step
void mul2();
void div2();
void div3();
void div4();
void memory();
void writeback();
void intialize();
void simulate(char file_name[]);
void display();
typedef struct {
long value;
int status;
int ins_id;
}registers;
registers register_File[16] = {};
typedef struct {
int address; //address offset only for load and store
char opcode[25];
int src1;
int src2;
int dest;
int literal;
long result;
int index; // comparing with ind to check if the last arithmatic ins has reached wb // for BZ, BAL & BNZ send the pc value along
int branch; // 1 if decoded to be taken 0 otherwise
int id; // for avoiding the conflict which ins is updating status of the dest reg
} Instructions;
Instructions instruction[100];
Instructions * ptr_instruction = instruction;
const Instructions nop = {0, "nop", 0, 0, 0, 0, 0.0, 0, 0, 0};
Instructions if_input = {0, "nop", 0, 0, 0, 0, 0.0, 0, 0, 0};
Instructions idrf_input = {0, "nop", 0, 0, 0, 0, 0.0, 0, 0, 0};
Instructions iex_input = {0, "nop", 0, 0, 0, 0, 0.0, 0, 0, 0};
Instructions imul2_input = {0, "nop", 0, 0, 0, 0, 0.0, 0, 0, 0};
Instructions idiv2_input = {0, "nop", 0, 0, 0, 0, 0.0, 0, 0, 0};
Instructions idiv3_input = {0, "nop", 0, 0, 0, 0, 0.0, 0, 0, 0};
Instructions idiv4_input = {0, "nop", 0, 0, 0, 0, 0.0, 0, 0, 0};
Instructions imem_input = {0, "nop", 0, 0, 0, 0, 0.0, 0, 0, 0};
Instructions iwb_input = {0, "nop", 0, 0, 0, 0, 0.0, 0, 0, 0};
int last_arithmetic_ind = 100;
long last_arithmetic_result = -10;
int ind = 0;
int bflag = 0; // adds one more cycle for branch instructions
int hflag = 0;
int mflag = 0;
int dflag = 0;
int d1flag = 0;
int d2flag = 0;
int id = 0; //for conflicting register status validation
int ch = 0;
int main() {
char file_name[20];
while (1){
printf("\n Enter '1' for 'INITIALIZATION', '2' to 'SIMULATE', '3' to 'DISPLAY', and '0' to TERMINATE\n\t");
scanf("%d", &ch);
if (ch == 1)
intialize();
else if (ch == 2){
printf("\n Enter the filename you want to simulate : \t ");
scanf("%s", file_name);
simulate(file_name);
}
else if (ch == 3)
display();
else if (ch == 0)
break;
else
printf("\n Enter a Valid Command");
}
}
void simulate(char file_name[]){
printf("\n\t Enter the no. of clock cycles: ");
int cycles = 0;
scanf("%d", &cycles);
FILE * ptr_File = fopen (file_name,"r");
char line[255];
while( feof( ptr_File ) == 0){
fgets (line, 255, ptr_File);
printf("\n%d", line_Number);
printf("\t%s", line);
line_Number++;
sscanf(line,"%[^,]", ptr_instruction->opcode);
if (!(strcmp(ptr_instruction->opcode, "MOVC"))){
sscanf(line, "%[^,],R%d,#%d", ptr_instruction->opcode, &ptr_instruction->dest, &ptr_instruction->literal);
printf("\t%s R%d %d", ptr_instruction->opcode, ptr_instruction->dest, ptr_instruction->literal);
}
else if (!(strcmp(ptr_instruction->opcode, "STORE"))){
sscanf(line, "%[^,],R%d,R%d,#%d", ptr_instruction->opcode, &ptr_instruction->src1, &ptr_instruction->src2, &ptr_instruction->literal);
printf("\t%s R%d R%d %d", ptr_instruction->opcode, ptr_instruction->src1, ptr_instruction->src2, ptr_instruction->literal);
}
else if (!(strcmp(ptr_instruction->opcode, "LOAD"))){
sscanf(line, "%[^,],R%d,R%d,#%d", ptr_instruction->opcode, &ptr_instruction->dest, &ptr_instruction->src1, &ptr_instruction->literal);
printf("\t%s R%d R%d %d", ptr_instruction->opcode, ptr_instruction->dest, ptr_instruction->src1, ptr_instruction->literal);
}
else if ((!(strcmp(ptr_instruction->opcode, "MUL")) || !(strcmp(ptr_instruction->opcode, "ADD")) || !(strcmp(ptr_instruction->opcode, "SUB")) || !(strcmp(ptr_instruction->opcode, "OR")) || !(strcmp(ptr_instruction->opcode, "AND")) || !(strcmp(ptr_instruction->opcode, "EX-OR")))){
sscanf(line, "%[^,],R%d,R%d,R%d", ptr_instruction->opcode, &ptr_instruction->dest, &ptr_instruction->src1, &ptr_instruction->src2);
printf("\t%s R%d R%d R%d", ptr_instruction->opcode, ptr_instruction->dest, ptr_instruction->src1, ptr_instruction->src2);
}
else if ((!(strcmp(ptr_instruction->opcode, "BZ")) || !(strcmp(ptr_instruction->opcode, "BNZ")))){
sscanf(line, "%[^,],#%d", ptr_instruction->opcode, &ptr_instruction->literal);
printf("\t%s %d", ptr_instruction->opcode, ptr_instruction->literal);
}
else if (!(strcmp(ptr_instruction->opcode, "JUMP"))){
sscanf(line, "%[^,],R%d,#%d", ptr_instruction->opcode, &ptr_instruction->src1, &ptr_instruction->literal);
printf("\t%s R%d %d", ptr_instruction->opcode, ptr_instruction->src1, ptr_instruction->literal);
}
else if (!(strcmp(ptr_instruction->opcode, "HALT"))){
sscanf(line, "%[^,]", ptr_instruction->opcode);
printf("\t%s", ptr_instruction->opcode);
}
else if (!(strcmp(ptr_instruction->opcode, "DIV"))) {
sscanf(line, "%[^,],R%d,R%d,R%d", ptr_instruction->opcode, &ptr_instruction->dest, &ptr_instruction->src1, &ptr_instruction->src2);
printf("\t%s R%d R%d R%d", ptr_instruction->opcode, ptr_instruction->dest, ptr_instruction->src1, ptr_instruction->src2);
}
else if (!(strcmp(ptr_instruction->opcode, "JAL"))){
sscanf(line, "%[^,],R%d,R%d,#%d", ptr_instruction->opcode, &ptr_instruction->dest, &ptr_instruction->src1, &ptr_instruction->literal);
printf("\t%s R%d R%d %d", ptr_instruction->opcode, ptr_instruction->dest, ptr_instruction->src1, ptr_instruction->literal);
}
else{
printf("\t%s", "Not a valid opcode");
}
ptr_instruction++;
}
fclose(ptr_File);
for (int i = 1; i <= cycles; i++){
printf("\n--------Cycle No. = %d---------", i);
writeback();
memory();
if (dflag == 1 || hflag == 1){
if (d2flag == 1 || hflag == 1)
div4();
if (d1flag == 1 || hflag == 1)
div3();
div2();
}
if (mflag == 1)
mul2();
execute();
decode();
fetch();
if (hflag == 100)
break;
}
}
void fetch(){
if((pc <= line_Number) && hflag == 0){
if_input = instruction[pc];
if (!(strcmp(if_input.opcode, "MOVC"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d %d", if_input.opcode, if_input.dest, if_input.literal);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d %d stalled", if_input.opcode, if_input.dest, if_input.literal);
}
}
else if (!(strcmp(if_input.opcode, "STORE"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d R%d %d", if_input.opcode, if_input.src1, if_input.src2, if_input.literal);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d R%d %d stalled", if_input.opcode, if_input.src1, if_input.src2, if_input.literal);
}
}
else if (!(strcmp(if_input.opcode, "LOAD"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d R%d %d", if_input.opcode, if_input.dest, if_input.src1, if_input.literal);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d R%d %d stalled", if_input.opcode, if_input.dest, if_input.src1, if_input.literal);
}
}
else if (!(strcmp(if_input.opcode, "ADD"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d R%d R%d", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d R%d R%d stalled", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
}
}
else if (!(strcmp(if_input.opcode, "SUB"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d R%d R%d", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d R%d R%d stalled", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
}
}
else if (!(strcmp(if_input.opcode, "MUL"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d R%d R%d", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d R%d R%d stalled", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
}
}
else if (!(strcmp(if_input.opcode, "DIV"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d R%d R%d", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d R%d R%d stalled", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
}
}
else if (!(strcmp(if_input.opcode, "AND"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d R%d R%d", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d R%d R%d stalled", if_input.opcode, if_input.src1, if_input.src2, if_input.src2);
}
}
else if (!(strcmp(if_input.opcode, "OR"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d R%d R%d", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d R%d R%d stalled", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
}
}
else if (!(strcmp(if_input.opcode, "EX-OR"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d R%d R%d", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d R%d R%d stalled", if_input.opcode, if_input.dest, if_input.src1, if_input.src2);
}
}
else if (!(strcmp(if_input.opcode, "BNZ"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s %d", if_input.opcode, if_input.literal);
if_input.index = (pc);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s %d stalled", if_input.opcode, if_input.literal);
}
}
else if (!(strcmp(if_input.opcode, "BZ"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s %d", if_input.opcode, if_input.literal);
if_input.index = (pc);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s %d stalled", if_input.opcode, if_input.literal);
}
}
else if (!(strcmp(if_input.opcode, "HALT"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s", if_input.opcode);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s stalled", if_input.opcode);
}
}
else if (!(strcmp(if_input.opcode, "JUMP"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d %d", if_input.opcode, if_input.src1, if_input.literal);
idrf_input = if_input;
if_input = nop;
pc++;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d %d stalled", if_input.opcode, if_input.src1, if_input.literal);
}
}
else if (!(strcmp(if_input.opcode, "JAL"))){
if(!(strcmp(idrf_input.opcode, "nop"))){
if (bflag == 0){
printf("\n Fetch stage : \t\t %s R%d R%d %d", if_input.opcode, if_input.dest, if_input.src1, if_input.literal);
pc++;
if_input.index = (pc*4 + 4000);
idrf_input = if_input;
if_input = nop;
}
else{
bflag = 0;
printf("\n Fetch stage : \t\t idle");
}
}
else{
printf("\n Fetch stage : \t\t %s R%d R%d %d stalled", if_input.opcode, if_input.dest, if_input.src1, if_input.literal);
}
}
// else if
}
else
printf("\n Fetch stage : \t\t idle");
}
void decode(){
//printf("\n\t\t ind : %d", ind);
if((strcmp(idrf_input.opcode, "nop"))){
if (!(strcmp(idrf_input.opcode, "MOVC"))){
if(!(strcmp(iex_input.opcode, "nop")) && register_File[idrf_input.dest].status == VALID){
printf("\n Decode stage : \t %s R%d %d", idrf_input.opcode, idrf_input.dest, idrf_input.literal);
register_File[idrf_input.dest].status = INVALID;
idrf_input.id = id;
register_File[idrf_input.dest].ins_id = idrf_input.id;
//printf("\n reg : %d, ins : %d, id : %d", register_File[idrf_input.dest].ins_id, idrf_input.id, id );
id++;
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d %d stalled", idrf_input.opcode, idrf_input.dest, idrf_input.literal);
}
else if (!(strcmp(idrf_input.opcode, "STORE"))){
if((!(strcmp(iex_input.opcode, "nop"))) && register_File[idrf_input.src1].status == VALID && register_File[idrf_input.src2].status == VALID){
printf("\n Decode stage : \t %s R%d R%d %d", idrf_input.opcode, idrf_input.src1, idrf_input.src2, idrf_input.literal);
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d R%d %d stalled", idrf_input.opcode, idrf_input.src1, idrf_input.src2, idrf_input.literal);
}
else if (!(strcmp(idrf_input.opcode, "LOAD"))){
if((!(strcmp(iex_input.opcode, "nop"))) && register_File[idrf_input.src1].status == VALID && register_File[idrf_input.dest].status == VALID){
register_File[idrf_input.dest].status = INVALID;
printf("\n Decode stage : \t %s R%d R%d %d", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.literal);
idrf_input.id = id;
register_File[idrf_input.dest].ins_id = idrf_input.id;
id++;
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d R%d %d stalled", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.literal);
}
else if (!(strcmp(idrf_input.opcode, "ADD"))){
if((!(strcmp(iex_input.opcode, "nop"))) && register_File[idrf_input.src1].status == VALID && register_File[idrf_input.src2].status == VALID && register_File[idrf_input.dest].status == VALID){
register_File[idrf_input.dest].status = INVALID;
printf("\n Decode stage : \t %s R%d R%d R%d", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
idrf_input.index = ind;
ind++;
idrf_input.id = id;
register_File[idrf_input.dest].ins_id = idrf_input.id;
id++;
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d R%d R%d stalled", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
}
else if (!(strcmp(idrf_input.opcode, "SUB"))){
if((!(strcmp(iex_input.opcode, "nop"))) && register_File[idrf_input.src1].status == VALID && register_File[idrf_input.src2].status == VALID && register_File[idrf_input.dest].status == VALID){
register_File[idrf_input.dest].status = INVALID;
printf("\n Decode stage : \t %s R%d R%d R%d", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
idrf_input.index = ind;
ind++;
idrf_input.id = id;
register_File[idrf_input.dest].ins_id = idrf_input.id;
id++;
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d R%d R%d stalled", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
}
else if (!(strcmp(idrf_input.opcode, "MUL"))){
if((!(strcmp(iex_input.opcode, "nop"))) && register_File[idrf_input.src1].status == VALID && register_File[idrf_input.src2].status == VALID && register_File[idrf_input.dest].status == VALID){
register_File[idrf_input.dest].status = INVALID;
printf("\n Decode stage : \t %s R%d R%d R%d", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
idrf_input.index = ind;
ind++;
idrf_input.id = id;
register_File[idrf_input.dest].ins_id = idrf_input.id;
id++;
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d R%d R%d stalled", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
}
else if (!(strcmp(idrf_input.opcode, "DIV"))){
if((!(strcmp(iex_input.opcode, "nop"))) && register_File[idrf_input.src1].status == VALID && register_File[idrf_input.src2].status == VALID && register_File[idrf_input.dest].status == VALID){
register_File[idrf_input.dest].status = INVALID;
printf("\n Decode stage : \t %s R%d R%d R%d", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
idrf_input.index = ind;
ind++;
idrf_input.id = id;
register_File[idrf_input.dest].ins_id = idrf_input.id;
id++;
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d R%d R%d stalled", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
}
else if (!(strcmp(idrf_input.opcode, "AND"))){
if((!(strcmp(iex_input.opcode, "nop"))) && register_File[idrf_input.src1].status == VALID && register_File[idrf_input.src2].status == VALID && register_File[idrf_input.dest].status == VALID){
register_File[idrf_input.dest].status = INVALID;
printf("\n Decode stage : \t %s R%d R%d R%d", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
idrf_input.index = ind;
ind++;
idrf_input.id = id;
register_File[idrf_input.dest].ins_id = idrf_input.id;
id++;
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d R%d R%d stalled", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
}
else if (!(strcmp(idrf_input.opcode, "OR"))){
if((!(strcmp(iex_input.opcode, "nop"))) && register_File[idrf_input.src1].status == VALID && register_File[idrf_input.src2].status == VALID && register_File[idrf_input.dest].status == VALID){
register_File[idrf_input.dest].status = INVALID;
printf("\n Decode stage : \t %s R%d R%d R%d", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
idrf_input.index = ind;
ind++;
idrf_input.id = id;
register_File[idrf_input.dest].ins_id = idrf_input.id;
id++;
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d R%d R%d stalled", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
}
else if (!(strcmp(idrf_input.opcode, "EX-OR"))){
if((!(strcmp(iex_input.opcode, "nop"))) && register_File[idrf_input.src1].status == VALID && register_File[idrf_input.src2].status == VALID && register_File[idrf_input.dest].status == VALID){
register_File[idrf_input.dest].status = INVALID;
printf("\n Decode stage : \t %s R%d R%d R%d", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
idrf_input.index = ind;
ind++;
idrf_input.id = id;
register_File[idrf_input.dest].ins_id = idrf_input.id;
id++;
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d R%d R%d stalled", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.src2);
}
else if (!(strcmp(idrf_input.opcode, "BNZ"))){
if((!(strcmp(iex_input.opcode, "nop"))) && last_arithmetic_result != 0 && last_arithmetic_ind == (ind - 1)){
printf("\n Decode stage : \t %s %d", idrf_input.opcode, idrf_input.literal);
//set to one if taken branch
idrf_input.branch = 1;
iex_input = idrf_input;
idrf_input = nop;
}
else if((!(strcmp(iex_input.opcode, "nop"))) && last_arithmetic_result == 0 && last_arithmetic_ind == (ind - 1)){
printf("\n Decode stage : \t %s %d", idrf_input.opcode, idrf_input.literal);
idrf_input.branch = 0;
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s %d stalled", idrf_input.opcode, idrf_input.literal);
}
else if (!(strcmp(idrf_input.opcode, "BZ"))){
if((!(strcmp(iex_input.opcode, "nop"))) && last_arithmetic_result == 0 && last_arithmetic_ind == (ind - 1)){
printf("\n Decode stage : \t %s %d", idrf_input.opcode, idrf_input.literal);
//set to one if taken branch
idrf_input.branch = 1;
iex_input = idrf_input;
idrf_input = nop;
}
else if((!(strcmp(iex_input.opcode, "nop"))) && last_arithmetic_result != 0 && last_arithmetic_ind == (ind - 1)){
printf("\n Decode stage : \t %s %d", idrf_input.opcode, idrf_input.literal);
idrf_input.branch = 0;
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s %d stalled", idrf_input.opcode, idrf_input.literal);
}
else if (!(strcmp(idrf_input.opcode, "HALT"))){
if (!(strcmp(iex_input.opcode, "nop"))){
printf("\n Decode stage : \t %s ", idrf_input.opcode);
if_input = nop;
hflag = 1; // HALT flag
iex_input = idrf_input;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s stalled", idrf_input.opcode);
}
else if (!(strcmp(idrf_input.opcode, "JUMP"))){
if(!(strcmp(iex_input.opcode, "nop"))) {
printf("\n Decode stage : \t %s R%d %d", idrf_input.opcode, idrf_input.src1, idrf_input.literal);
iex_input = idrf_input;
if_input = nop;
bflag = 1;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d %d", idrf_input.opcode, idrf_input.src1, idrf_input.literal);
}
else if (!(strcmp(idrf_input.opcode, "JAL"))){
if(!(strcmp(iex_input.opcode, "nop"))) {
register_File[idrf_input.dest].status = INVALID;
printf("\n Decode stage : \t %s R%d R%d %d", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.literal);
iex_input = idrf_input;
if_input = nop;
bflag = 1;
idrf_input = nop;
}
else
printf("\n Decode stage : \t %s R%d R%d %d", idrf_input.opcode, idrf_input.dest, idrf_input.src1, idrf_input.literal);
}
//else if
}
else
printf("\n Decode stage : \t idle");
}
void execute(){
if((strcmp(iex_input.opcode, "nop"))){
if (!(strcmp(iex_input.opcode, "MOVC"))){
iex_input.result = iex_input.literal;
if (iex_input.id == register_File[iex_input.dest].ins_id)
register_File[iex_input.dest].status = VALID;
register_File[iex_input.dest].value = iex_input.result;
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s R%d %d", iex_input.opcode, iex_input.dest, iex_input.literal);
//printf("\n reg : %d, ins : %d, id : %d", register_File[iex_input.dest].ins_id, iex_input.id, id );
imem_input = iex_input;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d %d stalled", iex_input.opcode, iex_input.dest, iex_input.literal);
}
else if (!(strcmp(iex_input.opcode, "STORE"))){
iex_input.address = register_File[iex_input.src2].value + iex_input.literal;
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s R%d R%d %d", iex_input.opcode, iex_input.src1, iex_input.src2, iex_input.literal);
imem_input = iex_input;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d R%d %d stalled", iex_input.opcode, iex_input.src1, iex_input.src2, iex_input.literal);
}
else if (!(strcmp(iex_input.opcode, "LOAD"))){
iex_input.address = register_File[iex_input.src1].value + iex_input.literal;
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s R%d R%d %d", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.literal);
imem_input = iex_input;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d R%d %d stalled", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.literal);
}
else if (!(strcmp(iex_input.opcode, "ADD"))){
iex_input.result = register_File[iex_input.src1].value + register_File[iex_input.src2].value;
if (iex_input.id == register_File[iex_input.dest].ins_id)
register_File[iex_input.dest].status = VALID;
register_File[iex_input.dest].value = iex_input.result;
last_arithmetic_ind = iex_input.index;
last_arithmetic_result = iex_input.result;
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s R%d R%d R%d", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
imem_input = iex_input;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d R%d R%d stalled", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
}
else if (!(strcmp(iex_input.opcode, "SUB"))){
iex_input.result = register_File[iex_input.src1].value - register_File[iex_input.src2].value;
if (iex_input.id == register_File[iex_input.dest].ins_id)
register_File[iex_input.dest].status = VALID;
register_File[iex_input.dest].value = iex_input.result;
last_arithmetic_ind = iex_input.index;
last_arithmetic_result = iex_input.result;
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s R%d R%d R%d", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
imem_input = iex_input;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d R%d R%d stalled", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
}
else if (!(strcmp(iex_input.opcode, "MUL"))){
if(!(strcmp(imul2_input.opcode, "nop"))){
printf("\n Mul1 stage : \t\t %s R%d R%d R%d", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
imul2_input = iex_input;
iex_input = nop;
mflag = 1;
}
else
printf("\n Mul1 stage : \t\t %s R%d R%d R%d stalled", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
}
else if (!(strcmp(iex_input.opcode, "DIV"))){
if(!(strcmp(idiv2_input.opcode, "nop"))){
printf("\n DU1 stage : \t\t %s R%d R%d R%d", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
idiv2_input = iex_input;
iex_input = nop;
dflag = 1;
}
else
printf("\n DU1 stage : \t\t %s R%d R%d R%d stalled", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
}
else if (!(strcmp(iex_input.opcode, "AND"))){
iex_input.result = register_File[iex_input.src1].value & register_File[iex_input.src2].value;
if (iex_input.id == register_File[iex_input.dest].ins_id)
register_File[iex_input.dest].status = VALID;
register_File[iex_input.dest].value = iex_input.result;
last_arithmetic_ind = iex_input.index;
last_arithmetic_result = iex_input.result;
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s R%d R%d R%d", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
imem_input = iex_input;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d R%d R%d stalled", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
}
else if (!(strcmp(iex_input.opcode, "OR"))){
iex_input.result = register_File[iex_input.src1].value | register_File[iex_input.src2].value;
if (iex_input.id == register_File[iex_input.dest].ins_id)
register_File[iex_input.dest].status = VALID;
register_File[iex_input.dest].value = iex_input.result;
last_arithmetic_ind = iex_input.index;
last_arithmetic_result = iex_input.result;
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s R%d R%d R%d", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
imem_input = iex_input;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d R%d R%d stalled", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
}
else if (!(strcmp(iex_input.opcode, "EX-OR"))){
iex_input.result = register_File[iex_input.src1].value ^ register_File[iex_input.src2].value;
if (iex_input.id == register_File[iex_input.dest].ins_id)
register_File[iex_input.dest].status = VALID;
register_File[iex_input.dest].value = iex_input.result;
last_arithmetic_ind = iex_input.index;
last_arithmetic_result = iex_input.result;
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s R%d R%d R%d", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
imem_input = iex_input;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d R%d R%d stalled", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
}
else if (!(strcmp(iex_input.opcode, "BNZ"))){
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s %d", iex_input.opcode, iex_input.literal);
iex_input.result = (iex_input.index + (iex_input.literal/4));
imem_input = iex_input;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d R%d R%d stalled", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
}
else if (!(strcmp(iex_input.opcode, "BZ"))){
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s %d", iex_input.opcode, iex_input.literal);
iex_input.result = (iex_input.index + (iex_input.literal/4));
imem_input = iex_input;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d R%d R%d stalled", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.src2);
}
else if (!(strcmp(iex_input.opcode, "HALT"))){
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s ", iex_input.opcode);
idiv2_input = iex_input;
iex_input = nop;
hflag = 1;
}
else
printf("\n Execution stage : \t %s ", iex_input.opcode);
}
else if (!(strcmp(iex_input.opcode, "JUMP"))){
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s R%d %d", iex_input.opcode, iex_input.src1, iex_input.literal);
iex_input.result = (register_File[iex_input.src1].value + iex_input.literal - 4000 )/4;
imem_input = iex_input;
bflag = 1;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d %d stalled", iex_input.opcode, iex_input.src1, iex_input.literal);
}
else if (!(strcmp(iex_input.opcode, "JAL"))){
if(!(strcmp(imem_input.opcode, "nop"))){
printf("\n Execution stage : \t %s R%d R%d %d", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.literal);
iex_input.result = (register_File[iex_input.src1].value + iex_input.literal - 4000)/4;
imem_input = iex_input;
bflag = 1;
iex_input = nop;
}
else
printf("\n Execution stage : \t %s R%d R%d %d", iex_input.opcode, iex_input.dest, iex_input.src1, iex_input.literal);
}
//else if // for other instr
}
else
printf("\n Execution stage : \t idle");
}
void memory(){
if((strcmp(imem_input.opcode, "nop"))){
if (!(strcmp(imem_input.opcode, "MOVC"))){
if (imem_input.id == register_File[imem_input.dest].ins_id)
register_File[imem_input.dest].status = INVALID;
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s R%d %d", imem_input.opcode, imem_input.dest, imem_input.literal);
//printf("\n reg : %d, ins : %d, id : %d", register_File[imem_input.dest].ins_id, imem_input.id, id );
iwb_input = imem_input;
imem_input = nop;
}
else
printf("\n Memory stage : \t %s R%d %d stalled", imem_input.opcode, imem_input.dest, imem_input.literal);
}
else if (!(strcmp(imem_input.opcode, "STORE"))){
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s R%d R%d %d", imem_input.opcode, imem_input.src1, imem_input.src2, imem_input.literal);
data_Memory[imem_input.address/4] = register_File[imem_input.src1].value;
iwb_input = imem_input;
//printf("\n\t\t in data memory : %ld", data_Memory[imem_input.address/4]);
imem_input = nop;
}
else
printf("\n Memory stage : \t %s R%d R%d %d stalled", imem_input.opcode, imem_input.src1, imem_input.src2, imem_input.literal);
}
else if (!(strcmp(imem_input.opcode, "LOAD"))){
if (imem_input.id == register_File[imem_input.dest].ins_id)
register_File[imem_input.dest].status = INVALID;
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s R%d R%d %d", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.literal);
iwb_input = imem_input;
imem_input = nop;
}
else
printf("\n Memory stage : \t %s R%d R%d %d stalled", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.literal);
}
else if (!(strcmp(imem_input.opcode, "ADD"))){
if (imem_input.id == register_File[imem_input.dest].ins_id)
register_File[imem_input.dest].status = INVALID;
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s R%d R%d R%d", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
iwb_input = imem_input;
imem_input = nop;
}
else
printf("\n Memory stage : \t %s R%d R%d R%d stalled", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
}
else if (!(strcmp(imem_input.opcode, "AND"))){
if (imem_input.id == register_File[imem_input.dest].ins_id)
register_File[imem_input.dest].status = INVALID;
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s R%d R%d R%d", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
iwb_input = imem_input;
imem_input = nop;
}
else
printf("\n Memory stage : \t %s R%d R%d R%d stalled", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
}
else if (!(strcmp(imem_input.opcode, "SUB"))){
if (imem_input.id == register_File[imem_input.dest].ins_id)
register_File[imem_input.dest].status = INVALID;
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s R%d R%d R%d", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
iwb_input = imem_input;
imem_input = nop;
}
else
printf("\n Memory stage : \t %s R%d R%d R%d stalled", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
}
else if (!(strcmp(imem_input.opcode, "MUL"))){
if (imem_input.id == register_File[imem_input.dest].ins_id)
register_File[imem_input.dest].status = INVALID;
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s R%d R%d R%d", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
iwb_input = imem_input;
imem_input = nop;
}
else
printf("\n Memory stage : \t %s R%d R%d R%d stalled", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
}
else if (!(strcmp(imem_input.opcode, "DIV"))){
if (imem_input.id == register_File[imem_input.dest].ins_id)
register_File[imem_input.dest].status = INVALID;
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s R%d R%d R%d", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
iwb_input = imem_input;
imem_input = nop;
}
else
printf("\n Memory stage : \t %s R%d R%d R%d stalled", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
}
else if (!(strcmp(imem_input.opcode, "OR"))){
if (imem_input.id == register_File[imem_input.dest].ins_id)
register_File[imem_input.dest].status = INVALID;
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s R%d R%d R%d", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
iwb_input = imem_input;
imem_input = nop;
}
else
printf("\n Memory stage : \t %s R%d R%d R%d stalled", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
}
else if (!(strcmp(imem_input.opcode, "EX-OR"))){
if (imem_input.id == register_File[imem_input.dest].ins_id)
register_File[imem_input.dest].status = INVALID;
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s R%d R%d R%d", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
iwb_input = imem_input;
imem_input = nop;
}
else
printf("\n Memory stage : \t %s R%d R%d R%d stalled", imem_input.opcode, imem_input.dest, imem_input.src1, imem_input.src2);
}
else if (!(strcmp(imem_input.opcode, "BNZ"))){
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s %d", imem_input.opcode, imem_input.literal);
iwb_input = imem_input;
imem_input = nop;
}
else
printf("\n Memory stage : \t %s %d stalled", imem_input.opcode, imem_input.literal);
}
else if (!(strcmp(imem_input.opcode, "BZ"))){
if(!(strcmp(iwb_input.opcode, "nop"))){
printf("\n Memory stage : \t %s %d", imem_input.opcode, imem_input.literal);
iwb_input = imem_input;
imem_input = nop;
}
else
printf("\n Memory stage : \t %s %d stalled", imem_input.opcode, imem_input.literal);
}