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Maybe have the baseline local history predictor working.

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Ross Thompson 2023-05-01 15:45:27 -05:00
parent 7437cb67e5
commit 4eff75449a
1 changed files with 14 additions and 14 deletions
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28
src/ifu/bpred/localHistoryPredictor.sv
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@ -46,16 +46,16 @@ module localHistoryPredictor #(parameter m = 6, // 2^m = number of local history
logic [1:0] BPDirPredD, BPDirPredE;
logic [1:0] NewBPDirPredE, NewBPDirPredM;
logic [k-1:0] GHRF, GHRD, GHRE, GHRM, GHR;
logic [k-1:0] GHRNext;
logic [k-1:0] LHRF, LHRD, LHRE, LHRM, LHR;
logic [k-1:0] LHRNextW;
logic PCSrcM;
logic [2**m-1:0][k-1:0] LHR;
logic [2**m-1:0][k-1:0] LHRArray;
logic [m-1:0] IndexLHRNextF, IndexLHRM;
logic UpdateM;
assign IndexNextF = GHRNext;
assign IndexM = GHRM;
assign IndexNextF = LHR;
assign IndexM = LHRM;
ram2p1r1wbe #(2**k, 2) PHT(.clk(clk),
.ce1(~StallF), .ce2(~StallW & ~FlushW),
@ -74,28 +74,28 @@ module localHistoryPredictor #(parameter m = 6, // 2^m = number of local history
assign BPDirPredWrongE = PCSrcE != BPDirPredE[1] & BranchE;
assign GHRNext = BranchM ? {PCSrcM, GHR[k-1:1]} : GHR;
assign LHRNextW = BranchM ? {PCSrcM, LHRM[k-1:1]} : LHRM;
// this is local history
genvar index;
assign UpdateM = BranchM & ~StallM & ~FlushM;
assign UpdateM = BranchM & ~StallW & ~FlushW;
assign IndexLHRM = {PCM[m+1] ^ PCM[1], PCM[m:2]};
for (index = 0; index < 2**m; index = index +1) begin:localhist
flopenr #(k) LocalHistoryRegister(.clk, .reset, .en(UpdateM & (index == IndexLHRM)),
.d(GHRNext), .q(LHR[index]));
.d(LHRNextW), .q(LHRArray[index]));
end
assign IndexLHRNextF = {PCNextF[m+1] ^ PCNextF[1], PCNextF[m:2]};
assign GHR = LHR[IndexLHRNextF];
assign LHR = LHRArray[IndexLHRNextF];
// this is global history
//flopenr #(k) GHRReg(clk, reset, ~StallM & ~FlushM & BranchM, GHRNext, GHR);
//flopenr #(k) LHRReg(clk, reset, ~StallM & ~FlushM & BranchM, LHRNextW, LHR);
flopenrc #(1) PCSrcMReg(clk, reset, FlushM, ~StallM, PCSrcE, PCSrcM);
flopenrc #(k) GHRFReg(clk, reset, FlushD, ~StallF, GHR, GHRF);
flopenrc #(k) GHRDReg(clk, reset, FlushD, ~StallD, GHRF, GHRD);
flopenrc #(k) GHREReg(clk, reset, FlushE, ~StallE, GHRD, GHRE);
flopenrc #(k) GHRMReg(clk, reset, FlushM, ~StallM, GHRE, GHRM);
flopenrc #(k) LHRFReg(clk, reset, FlushD, ~StallF, LHR, LHRF);
flopenrc #(k) LHRDReg(clk, reset, FlushD, ~StallD, LHRF, LHRD);
flopenrc #(k) LHREReg(clk, reset, FlushE, ~StallE, LHRD, LHRE);
flopenrc #(k) LHRMReg(clk, reset, FlushM, ~StallM, LHRE, LHRM);
endmodule