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BPPredWrongM needs to be 0 when there is no branch predictor. BPPredWRongM is only used when there is an icacheflush.

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This commit is contained in:
Ross Thompson 2022-01-27 07:59:59 -06:00
parent 3ebcd35a8c
commit db0a0bd29e
1 changed files with 3 additions and 1 deletions
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4
pipelined/src/ifu/ifu.sv
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@ -334,7 +334,6 @@ module ifu (
mux2 #(`XLEN) pcmuxBPWrongInvalidateFlush(.d0(PCE), .d1(PCF), .s(BPPredWrongM), .y(PCBPWrongInvalidate));
mux2 #(`XLEN) pcmux3(.d0(PCNext2F), .d1(PrivilegedNextPCM), .s(PrivilegedChangePCM), .y(UnalignedPCNextF));
flopenrc #(1) BPPredWrongMReg(.clk, .reset, .en(~StallM), .clear(FlushM), .d(BPPredWrongE), .q(BPPredWrongM));
assign PCNextF = {UnalignedPCNextF[`XLEN-1:1], 1'b0}; // hart-SPEC p. 21 about 16-bit alignment
@ -344,6 +343,8 @@ module ifu (
if (`BPRED_ENABLED) begin : bpred
logic BPPredDirWrongE, BTBPredPCWrongE, RASPredPCWrongE, BPPredClassNonCFIWrongE;
flopenrc #(1) BPPredWrongMReg(.clk, .reset, .en(~StallM), .clear(FlushM), .d(BPPredWrongE), .q(BPPredWrongM));
bpred bpred(.clk, .reset,
.StallF, .StallD, .StallE,
.FlushF, .FlushD, .FlushE,
@ -369,6 +370,7 @@ module ifu (
end else begin : bpred
assign BPPredPCF = '0;
assign BPPredWrongE = PCSrcE;
assign BPPredWrongM = '0;
assign {SelBPPredF, BPPredDirWrongM, BTBPredPCWrongM, RASPredPCWrongM, BPPredClassNonCFIWrongM} = '0;
end