Homework Fourth Chapter

4.48

Take the finger stage

Icode:ifun = m1[pc] = c:0

RA:RB <= M1[pc+1]

Valc <= M4[pc+2]

Valp <= PC + 6

Decoding phase

Valb <= R[RB]

Implementation phase

ValE <= Valb + valc

Setcc

Visit stage

Write Back Stage

R[RB] <= ValE

4.50

Take a finger

BOOL Need_regids =

Icode in {irrmovl, IOPL, IPUSHL, IPOPL,

IIRMOVL, IRMMOVL, IMRMOVL, IADDL

};

BOOL Need_valc =

Icode in {iirmovl, IRMMOVL, IMRMOVL, Ijxx, ICALL, IADDL

};

Decoding and writeback

int Srca = [

Icode in {irrmovl, IRMMOVL, IOPL, IPUSHL}: RA;

Icode in {Ipopl,iret}: RESP;

1:rnone; # Don ' t need register

];

int SrcB = [

Icode in {IOPL, IRMMOVL, IMRMOVL, iaddl}: RB;

Icode in {IPUSHL, IPOPL, ICALL, IRET}: RESP;

Icode in {ileave}: REBP;

1:rnone; # Don ' t need register

];

int dste = [

Icode in {IRRMOVL} && cnd:rb;

Icode in {iirmovl, IOPL, iaddl}: RB;

Icode in {IPUSHL, IPOPL, ICALL, IRET, ileave}: RESP;

1:rnone; # Don ' t write any register

];

int dstm = [

Icode in {imrmovl, Ipopl}:ra;

Icode in {ileave}: REBP;

1:rnone; # Don ' t write any register

];

Perform

int AluA = [

Icode in {IRRMOVL, IOPL}: ValA;

Icode in {iirmovl, IRMMOVL, IMRMOVL, iaddl}: Valc;

Icode in {ICALL, ipushl}:-4;

Icode in {IRET, IPOPL, Ileave}:4;

# Other instructions don ' t need ALU

];

int alub = [

Icode in {irmmovl, IMRMOVL, IOPL, ICALL,IPUSHL, IRET, IPOPL, Ileave, iaddl}: Valb;

Icode in {irrmovl, iirmovl}:0;

# Other instructions don ' t need ALU

];

BOOL SET_CC = Icode in {IOPL, iaddl};

Visit

int mem_addr = [

Icode in {irmmovl, IPUSHL, ICALL, IMRMOVL}: ValE;

Icode in {ipopl, IRET}: ValA;

Icode in {ileave}: valb;

# Other instructions don ' t need address

];

BOOL Mem_read = Icode in {imrmovl, IPOPL, IRET, ileave};

Homework Fourth Chapter