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Parameterized testbench branch predictor preload.

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Ross Thompson 2023-01-31 00:08:11 -06:00
parent 22ef051603
commit b64b3016e2
2 changed files with 4 additions and 7 deletions
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9
pipelined/src/ifu/bpred/speculativegshare.sv
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@ -46,7 +46,7 @@ module speculativegshare #(parameter int k = 10 ) (
logic MatchNextX, MatchXF; logic MatchNextX, MatchXF;
logic [1:0] TableDirPredictionF, DirPredictionD, DirPredictionE; logic [1:0] TableDirPredictionF, DirPredictionD, DirPredictionE;
logic [1:0] NewDirPredictionF, NewDirPredictionD, NewDirPredictionE; logic [1:0] NewDirPredictionE;
logic [k-1:0] GHRF, GHRD, GHRE; logic [k-1:0] GHRF, GHRD, GHRE;
logic GHRLastF; logic GHRLastF;
@ -79,8 +79,8 @@ module speculativegshare #(parameter int k = 10 ) (
flopenr #(1) MatchReg(clk, reset, ~StallF, MatchNextX, MatchXF); flopenr #(1) MatchReg(clk, reset, ~StallF, MatchNextX, MatchXF);
assign ForwardNewDirPrediction = MatchF ? NewDirPredictionF : assign ForwardNewDirPrediction = MatchF ? {2{DirPredictionF[1]}} :
MatchD ? NewDirPredictionD : MatchD ? {2{DirPredictionD[1]}} :
NewDirPredictionE ; NewDirPredictionE ;
flopenr #(2) ForwardDirPredicitonReg(clk, reset, ~StallF, ForwardNewDirPrediction, ForwardDirPredictionF); flopenr #(2) ForwardDirPredicitonReg(clk, reset, ~StallF, ForwardNewDirPrediction, ForwardDirPredictionF);
@ -91,10 +91,7 @@ module speculativegshare #(parameter int k = 10 ) (
flopenr #(2) PredictionRegD(clk, reset, ~StallD, DirPredictionF, DirPredictionD); flopenr #(2) PredictionRegD(clk, reset, ~StallD, DirPredictionF, DirPredictionD);
flopenr #(2) PredictionRegE(clk, reset, ~StallE, DirPredictionD, DirPredictionE); flopenr #(2) PredictionRegE(clk, reset, ~StallE, DirPredictionD, DirPredictionE);
// New prediction pipeline
assign NewDirPredictionF = {DirPredictionF[1], DirPredictionF[1]};
flopenr #(2) NewPredDReg(clk, reset, ~StallD, NewDirPredictionF, NewDirPredictionD);
satCounter2 BPDirUpdateE(.BrDir(PCSrcE), .OldState(DirPredictionE), .NewState(NewDirPredictionE)); satCounter2 BPDirUpdateE(.BrDir(PCSrcE), .OldState(DirPredictionE), .NewState(NewDirPredictionE));
// GHR pipeline // GHR pipeline

2
pipelined/testbench/testbench.sv
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@ -471,7 +471,7 @@ logic [3:0] dummy;
genvar adrindex; genvar adrindex;
// Initializing all zeroes into the branch predictor memory. // Initializing all zeroes into the branch predictor memory.
for(adrindex = 0; adrindex < 1024; adrindex++) begin for(adrindex = 0; adrindex < 2**`BPRED_SIZE; adrindex++) begin
initial begin initial begin
force dut.core.ifu.bpred.bpred.Predictor.DirPredictor.PHT.mem[adrindex] = 0; force dut.core.ifu.bpred.bpred.Predictor.DirPredictor.PHT.mem[adrindex] = 0;
force dut.core.ifu.bpred.bpred.TargetPredictor.memory.mem[adrindex] = 0; force dut.core.ifu.bpred.bpred.TargetPredictor.memory.mem[adrindex] = 0;