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merge conflict resolved -- Ross and I made the same fix

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bbracker 2021-05-03 10:10:42 -04:00
commit c643372e1d
2 changed files with 65 additions and 64 deletions
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126
wally-pipelined/src/ifu/localHistoryPredictor.sv
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@ -30,74 +30,74 @@
module localHistoryPredictor module localHistoryPredictor
#( parameter int m = 6, // 2^m = number of local history branches #( parameter int m = 6, // 2^m = number of local history branches
parameter int k = 10 // number of past branches stored parameter int k = 10 // number of past branches stored
) )
(input logic clk, (input logic clk,
input logic reset, input logic reset,
input logic StallF, StallD, StallE, FlushF, FlushD, FlushE, input logic StallF, StallD, StallE, FlushF, FlushD, FlushE,
input logic [`XLEN-1:0] LookUpPC, input logic [`XLEN-1:0] LookUpPC,
output logic [1:0] Prediction, output logic [1:0] Prediction,
// update // update
input logic [`XLEN-1:0] UpdatePC, input logic [`XLEN-1:0] UpdatePC,
input logic UpdateEN, PCSrcE, input logic UpdateEN, PCSrcE,
input logic [1:0] UpdatePrediction input logic [1:0] UpdatePrediction
); );
logic [2**m-1:0][k-1:0] LHRNextF; logic [2**m-1:0][k-1:0] LHRNextF;
logic [k-1:0] LHRF, LHRFNext, ForwardLHRNext; logic [k-1:0] LHRF, ForwardLHRNext, LHRFNext;
logic [m-1:0] LookUpPCIndex, UpdatePCIndex; logic [m-1:0] LookUpPCIndex, UpdatePCIndex;
logic [1:0] PredictionMemory; logic [1:0] PredictionMemory;
logic DoForwarding, DoForwardingF, DoForwardingPHT, DoForwardingPHTF; logic DoForwarding, DoForwardingF, DoForwardingPHT, DoForwardingPHTF;
logic [1:0] UpdatePredictionF; logic [1:0] UpdatePredictionF;
assign LHRFNext = {PCSrcE, LHRF[k-1:1]}; assign LHRFNext = {PCSrcE, LHRF[k-1:1]};
assign UpdatePCIndex = {UpdatePC[m+1] ^ UpdatePC[1], UpdatePC[m:2]}; assign UpdatePCIndex = {UpdatePC[m+1] ^ UpdatePC[1], UpdatePC[m:2]};
assign LookUpPCIndex = {LookUpPC[m+1] ^ LookUpPC[1], LookUpPC[m:2]}; assign LookUpPCIndex = {LookUpPC[m+1] ^ LookUpPC[1], LookUpPC[m:2]};
// INCASE we do ahead pipelining // INCASE we do ahead pipelining
// SRAM2P1R1W #(m,k) LHR(.clk(clk)), // SRAM2P1R1W #(m,k) LHR(.clk(clk)),
// .reset(reset), // .reset(reset),
// .RA1(LookUpPCIndex), // need hashing function to get correct PC address // .RA1(LookUpPCIndex), // need hashing function to get correct PC address
// .RD1(LHRF), // .RD1(LHRF),
// .REN1(~StallF), // .REN1(~StallF),
// .WA1(UpdatePCIndex), // .WA1(UpdatePCIndex),
// .WD1(LHRENExt), // .WD1(LHRENExt),
// .WEN1(UpdateEN), // .WEN1(UpdateEN),
// .BitWEN1(2'b11)); // .BitWEN1(2'b11));
genvar index; genvar index;
generate generate
for (index = 0; index < 2**m; index = index +1) begin for (index = 0; index < 2**m; index = index +1) begin
flopenr #(k) LocalHistoryRegister(.clk(clk), flopenr #(k) LocalHistoryRegister(.clk(clk),
.reset(reset), .reset(reset),
.en(UpdateEN && (index == UpdatePCIndex)), .en(UpdateEN && (index == UpdatePCIndex)),
.d(LHRFNext), .d(LHRFNext),
.q(LHRNextF[index])); .q(LHRNextF[index]));
end end
endgenerate endgenerate
// need to forward when updating to the same address as reading. // need to forward when updating to the same address as reading.
// first we compare to see if the update and lookup addreses are the same // first we compare to see if the update and lookup addreses are the same
assign DoForwarding = LookUpPCIndex == UpdatePCIndex; assign DoForwarding = LookUpPCIndex == UpdatePCIndex;
assign ForwardLHRNext = DoForwarding ? LHRFNext :LHRNextF[LookUpPCIndex]; assign ForwardLHRNext = DoForwarding ? LHRFNext :LHRNextF[LookUpPCIndex];
// Make Prediction by reading the correct address in the PHT and also update the new address in the PHT // Make Prediction by reading the correct address in the PHT and also update the new address in the PHT
// LHR referes to the address that the past k branches points to in the prediction stage // LHR referes to the address that the past k branches points to in the prediction stage
// LHRE refers to the address that the past k branches points to in the exectution stage // LHRE refers to the address that the past k branches points to in the exectution stage
SRAM2P1R1W #(k, 2) PHT(.clk(clk), SRAM2P1R1W #(k, 2) PHT(.clk(clk),
.reset(reset), .reset(reset),
.RA1(ForwardLHRNext), .RA1(ForwardLHRNext),
.RD1(PredictionMemory), .RD1(PredictionMemory),
.REN1(~StallF), .REN1(~StallF),
.WA1(LHRFNext), .WA1(LHRFNext),
.WD1(UpdatePrediction), .WD1(UpdatePrediction),
.WEN1(UpdateEN), .WEN1(UpdateEN),
.BitWEN1(2'b11)); .BitWEN1(2'b11));
assign DoForwardingPHT = LHRFNext == ForwardLHRNext; assign DoForwardingPHT = LHRFNext == ForwardLHRNext;
// register the update value and the forwarding signal into the Fetch stage // register the update value and the forwarding signal into the Fetch stage
// TODO: add stall logic *** // TODO: add stall logic ***
@ -115,24 +115,24 @@ assign DoForwardingPHT = LHRFNext == ForwardLHRNext;
//pipeline for LHR //pipeline for LHR
flopenrc #(k) LHRFReg(.clk(clk), flopenrc #(k) LHRFReg(.clk(clk),
.reset(reset), .reset(reset),
.en(~StallF), .en(~StallF),
.clear(FlushF), .clear(FlushF),
.d(ForwardLHRNext), .d(ForwardLHRNext),
.q(LHRF)); .q(LHRF));
/* /*
flopenrc #(k) LHRDReg(.clk(clk), flopenrc #(k) LHRDReg(.clk(clk),
.reset(reset), .reset(reset),
.en(~StallD), .en(~StallD),
.clear(FlushD), .clear(FlushD),
.d(LHRF), .d(LHRF),
.q(LHRD)); .q(LHRD));
flopenrc #(k) LHREReg(.clk(clk), flopenrc #(k) LHREReg(.clk(clk),
.reset(reset), .reset(reset),
.en(~StallE), .en(~StallE),
.clear(FlushE), .clear(FlushE),
.d(LHRD), .d(LHRD),
.q(LHRE)); .q(LHRE));
*/ */
endmodule endmodule

3
wally-pipelined/src/muldiv/div.sv
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@ -282,7 +282,8 @@ module csa #(parameter WIDTH=8) (input logic [WIDTH-1:0] a, b, c,
fa fa_inst (a[i], b[i], c[i], sum[i], carry_temp[i+1]); fa fa_inst (a[i], b[i], c[i], sum[i], carry_temp[i+1]);
end end
endgenerate endgenerate
assign carry = {1'b0, carry_temp[WIDTH-1:1], 1'b0}; //assign carry = {1'b0, carry_temp[WIDTH-1:1], 1'b0}; // trmimmed excess bit dh 5/3/21
assign carry = {carry_temp[WIDTH-1:1], 1'b0};
endmodule // adder endmodule // adder