diff --git a/src/ifu/bpred/bpred.sv b/src/ifu/bpred/bpred.sv index cb7dc7fbd..f7cec5be7 100644 --- a/src/ifu/bpred/bpred.sv +++ b/src/ifu/bpred/bpred.sv @@ -135,7 +135,7 @@ module bpred ( end else if (`BPRED_TYPE == "BP_LOCAL_AHEAD") begin:Predictor localaheadbp #(`BPRED_NUM_LHR, `BPRED_SIZE) DirPredictor(.clk, .reset, .StallF, .StallD, .StallE, .StallM, .StallW, .FlushD, .FlushE, .FlushM, .FlushW, - .PCNextF, .PCM, .BPDirPredF(BPDirPredF), .BPDirPredWrongE, + .PCNextF, .PCM, .BPDirPredD(BPDirPredF), .BPDirPredWrongE, .BranchE, .BranchM, .PCSrcE); end diff --git a/src/ifu/bpred/localaheadbp.sv b/src/ifu/bpred/localaheadbp.sv index 80b1c12d1..617a5fca1 100644 --- a/src/ifu/bpred/localaheadbp.sv +++ b/src/ifu/bpred/localaheadbp.sv @@ -35,7 +35,7 @@ module localaheadbp #(parameter m = 6, // 2^m = number of local history branches input logic reset, input logic StallF, StallD, StallE, StallM, StallW, input logic FlushD, FlushE, FlushM, FlushW, - output logic [1:0] BPDirPredF, + output logic [1:0] BPDirPredD, output logic BPDirPredWrongE, // update input logic [`XLEN-1:0] PCNextF, PCM, @@ -43,9 +43,10 @@ module localaheadbp #(parameter m = 6, // 2^m = number of local history branches ); logic [k-1:0] IndexNextF, IndexM; - logic [1:0] BPDirPredD, BPDirPredE; - //logic [1:0] BPDirPredE; - logic [1:0] NewBPDirPredE, NewBPDirPredM; + //logic [1:0] BPDirPredD, BPDirPredE; + logic [1:0] BPDirPredE; + logic [1:0] BPDirPredM; + logic [1:0] NewBPDirPredE, NewBPDirPredM, NewBPDirPredW; logic [k-1:0] LHRF, LHRD, LHRE, LHRM, LHRW, LHRNextF; logic [k-1:0] LHRNextW; @@ -63,19 +64,21 @@ module localaheadbp #(parameter m = 6, // 2^m = number of local history branches ram2p1r1wbe #(2**k, 2) PHT(.clk(clk), .ce1(~StallF), .ce2(~StallW & ~FlushW), .ra1(LHRF), - .rd1(BPDirPredF), + .rd1(BPDirPredD), .wa2(IndexM), - .wd2(NewBPDirPredM), + .wd2(NewBPDirPredW), .we2(BranchM), .bwe2(1'b1)); - flopenrc #(2) PredictionRegD(clk, reset, FlushD, ~StallD, BPDirPredF, BPDirPredD); + //flopenrc #(2) PredictionRegD(clk, reset, FlushD, ~StallD, BPDirPredF, BPDirPredD); flopenrc #(2) PredictionRegE(clk, reset, FlushE, ~StallE, BPDirPredD, BPDirPredE); + flopenrc #(2) PredictionRegM(clk, reset, FlushM, ~StallM, BPDirPredE, BPDirPredM); - satCounter2 BPDirUpdateE(.BrDir(PCSrcE), .OldState(BPDirPredE), .NewState(NewBPDirPredE)); - flopenrc #(2) NewPredictionRegM(clk, reset, FlushM, ~StallM, NewBPDirPredE, NewBPDirPredM); + satCounter2 BPDirUpdateE(.BrDir(PCSrcE), .OldState(BPDirPredM), .NewState(NewBPDirPredM)); + //flopenrc #(2) NewPredictionRegM(clk, reset, FlushM, ~StallM, NewBPDirPredE, NewBPDirPredM); + flopenrc #(2) NewPredictionRegW(clk, reset, FlushW, ~StallW, NewBPDirPredM, NewBPDirPredW); - assign BPDirPredWrongE = PCSrcE != BPDirPredE[1] & BranchE; + assign BPDirPredWrongE = PCSrcE != BPDirPredM[1] & BranchE; // This is the main difference between global and local history basic implementations. In global, // the ghr wraps back into itself directly without