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Improved no class prediction mode.

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This commit is contained in:
Ross Thompson 2023-01-26 10:54:43 -06:00
parent 19a964325a
commit 3577220625
1 changed files with 6 additions and 3 deletions
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9
pipelined/src/ifu/brpred/bpred.sv
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@ -132,9 +132,6 @@ module bpred (
// 1) A direction (1 = Taken, 0 = Not Taken)
// 2) Any information which is necessary for the predictor to build its next state.
// For a 2 bit table this is the prediction count.
assign SelBPPredF = (PredInstrClassF[0] & DirPredictionF[1] & PredValidF) |
PredInstrClassF[2] |
(PredInstrClassF[1] & PredValidF) ;
// Part 2 Branch target address prediction
// *** For now the BTB will house the direct and indirect targets
@ -183,8 +180,14 @@ module bpred (
assign InstrClassF[3] = ((PostSpillInstrRawF[6:0] & 7'h77) == 7'h67 & (PostSpillInstrRawF[11:07] & 5'h1B) == 5'h01) | // jal(r) must link to ra or x5
(`C_SUPPORTED & (cjal | cjalr) & ((PostSpillInstrRawF[11:7] & 5'h1b) == 5'h01));
assign PredInstrClassF = InstrClassF;
assign SelBPPredF = (PredInstrClassF[0] & DirPredictionF[1]) |
PredInstrClassF[2] |
(PredInstrClassF[1]) ;
end else begin
assign PredInstrClassF = BTBPredInstrClassF;
assign SelBPPredF = (PredInstrClassF[0] & DirPredictionF[1] & PredValidF) |
PredInstrClassF[2] |
(PredInstrClassF[1] & PredValidF) ;
end