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Fixed subtle bug in btb.

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This commit is contained in:
Ross Thompson 2023-01-25 15:16:53 -06:00
parent d4004c2c22
commit bb89bf82bf
2 changed files with 2 additions and 4 deletions
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1
pipelined/src/ifu/brpred/bpred.sv
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@ -146,7 +146,6 @@ module bpred (
.UpdateEN(|InstrClassE | PredictionInstrClassWrongE), .UpdateEN(|InstrClassE | PredictionInstrClassWrongE),
.PCE, .PCE,
.IEUAdrE, .IEUAdrE,
.UpdateInvalid(PredictionInstrClassWrongE),
.InstrClassE); .InstrClassE);
// Part 3 RAS // Part 3 RAS

5
pipelined/src/ifu/brpred/btb.sv
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@ -44,8 +44,7 @@ module btb
input logic UpdateEN, input logic UpdateEN,
input logic [`XLEN-1:0] PCE, input logic [`XLEN-1:0] PCE,
input logic [`XLEN-1:0] IEUAdrE, input logic [`XLEN-1:0] IEUAdrE,
input logic [3:0] InstrClassE, input logic [3:0] InstrClassE
input logic UpdateInvalid
); );
localparam TotalDepth = 2 ** Depth; localparam TotalDepth = 2 ** Depth;
@ -92,7 +91,7 @@ module btb
if (reset) begin if (reset) begin
ValidBits <= #1 {TotalDepth{1'b0}}; ValidBits <= #1 {TotalDepth{1'b0}};
end else if (UpdateEN & ~StallM & ~FlushM) begin end else if (UpdateEN & ~StallM & ~FlushM) begin
ValidBits[PCEIndex] <= #1 ~ UpdateInvalid; ValidBits[PCEIndex] <= #1 |InstrClassE;
end end
PredValidF = ValidBits[PCNextFIndex]; PredValidF = ValidBits[PCNextFIndex];
end end