diff --git a/pipelined/src/ifu/ifu.sv b/pipelined/src/ifu/ifu.sv index 196746361..27b56f219 100644 --- a/pipelined/src/ifu/ifu.sv +++ b/pipelined/src/ifu/ifu.sv @@ -243,20 +243,15 @@ module ifu ( assign PrivilegedChangePCM = RetM | TrapM; - logic SelBPPredF; logic [`XLEN-1:0] BPPredPCF, PCNext0F; - logic BPPredWrongM; + // The true correct target is IEUAdrE if PCSrcE is 1 else it is the fall through PCLinkE. mux2 #(`XLEN) pccorrectemux(.d0(PCLinkE), .d1(IEUAdrE), .s(PCSrcE), .y(PCCorrectE)); mux2 #(`XLEN) pcmux2(.d0(PCNext1F), .d1(PCBPWrongInvalidate), .s(InvalidateICacheM), .y(PCNext2F)); mux2 #(`XLEN) pcmux3(.d0(PCNext2F), .d1(PrivilegedNextPCM), .s(PrivilegedChangePCM), .y(UnalignedPCNextF)); - mux2 #(`XLEN) pcmux0(.d0(PCPlus2or4F), .d1(BPPredPCF), .s(SelBPPredF), .y(PCNext0F)); mux2 #(`XLEN) pcmux1(.d0(PCNext0F), .d1(PCCorrectE), .s(BPPredWrongE), .y(PCNext1F)); - // Mux only required on instruction class miss prediction. - mux2 #(`XLEN) pcmuxBPWrongInvalidateFlush(.d0(PCE), .d1(PCF), - .s(BPPredWrongM), .y(PCBPWrongInvalidate)); @@ -266,18 +261,24 @@ module ifu ( // branch and jump predictor if (`BPRED_ENABLED) begin : bpred - + logic BPPredWrongM; + logic SelBPPredF; bpred bpred(.clk, .reset, .StallF, .StallD, .StallE, .StallM, .FlushF, .FlushD, .FlushE, .FlushM, .InstrD, .PCNextF, .BPPredPCF, .SelBPPredF, .PCE, .PCSrcE, .IEUAdrE, .PCD, .PCLinkE, .InstrClassM, .BPPredWrongE, .BPPredWrongM, .BPPredDirWrongM, .BTBPredPCWrongM, .RASPredPCWrongM, .BPPredClassNonCFIWrongM); + + mux2 #(`XLEN) pcmux0(.d0(PCPlus2or4F), .d1(BPPredPCF), .s(SelBPPredF), .y(PCNext0F)); + // Mux only required on instruction class miss prediction. + mux2 #(`XLEN) pcmuxBPWrongInvalidateFlush(.d0(PCE), .d1(PCF), + .s(BPPredWrongM), .y(PCBPWrongInvalidate)); end else begin : bpred assign BPPredWrongE = PCSrcE; assign {BPPredDirWrongM, BTBPredPCWrongM, RASPredPCWrongM, BPPredClassNonCFIWrongM} = '0; - assign SelBPPredF = 1'b0; + assign PCNext0F = PCPlus2or4F; //assign PCNext1F = PCPlus2or4F; //assign PCBPWrongInvalidate = PCE; end