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Simplified RAS.

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This commit is contained in:
Ross Thompson 2023-01-31 14:54:05 -06:00
parent 122809b2b2
commit dd556e8763
1 changed files with 12 additions and 11 deletions
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23
pipelined/src/ifu/bpred/RASPredictor.sv
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@ -52,21 +52,22 @@ module RASPredictor #(parameter int StackSize = 16 )(
logic IncrRepairD, DecRepairD;
logic DecrementPtr;
logic FlushedRetDE;
logic WrongPredRetD;
assign PopF = PredInstrClassF[2] & ~StallD & ~FlushD;
assign RepairD = ((WrongPredInstrClassD[2]) & ~StallE & ~FlushE) | // Wrong class undo increment or decrement.
(~StallE & FlushE & InstrClassD[2]) | // ret in decode flushed
(~StallM & FlushM & InstrClassE[2]) ; // ret in execution flushed
assign IncrRepairD = (~StallE & FlushE & InstrClassD[2]) | // ret in decode flushed
(~StallM & FlushM & InstrClassE[2]) | // ret in execution flushed
(WrongPredInstrClassD[2] & ~InstrClassD[2] & ~StallE & ~FlushE); // Guessed it was a ret, but its not
assign DecRepairD = (WrongPredInstrClassD[2] & InstrClassD[2] & ~StallE & ~FlushE); // Guessed non ret but is a ret.
assign PushE = InstrClassE[3] & ~StallM & ~FlushM;
assign WrongPredRetD = (WrongPredInstrClassD[2]) & ~StallE & ~FlushE;
assign FlushedRetDE = (~StallE & FlushE & InstrClassD[2]) | (~StallM & FlushM & InstrClassE[2]);
assign RepairD = WrongPredRetD | FlushedRetDE ;
assign IncrRepairD = FlushedRetDE | (WrongPredRetD & ~InstrClassD[2]); // Guessed it was a ret, but its not
assign DecRepairD = WrongPredRetD & InstrClassD[2]; // Guessed non ret but is a ret.
assign CounterEn = PopF | PushE | RepairD;
assign DecrementPtr = (PopF | DecRepairD) & ~IncrRepairD;