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Removed pessimistic x propagation issue for wally32priv test in the branch predictor.

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This commit is contained in:
Ross Thompson 2023-01-27 15:28:31 -06:00
parent c1ae7c068e
commit 857004c3a3
1 changed files with 12 additions and 0 deletions
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12
pipelined/src/ifu/brpred/speculativegshare.sv
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@ -106,9 +106,21 @@ module speculativegshare
satCounter2 BPDirUpdateE(.BrDir(PCSrcE), .OldState(DirPredictionE), .NewState(NewDirPredictionE));
// GHR pipeline
// this version fails the regression test do to pessimistic x propagation.
/* -----\/----- EXCLUDED -----\/-----
assign GHRNextF = FlushD ? (BranchInstrE ? GHRNextD[k:1] : GHRNextD[k-1:0]) :
BranchInstrF ? {DirPredictionF[1], GHRF[k-1:1]} :
GHRF;
-----/\----- EXCLUDED -----/\----- */
always_comb begin
if(FlushD) begin
if(BranchInstrE) GHRNextF = GHRNextD[k:1];
else GHRNextF = GHRNextD[k-1:0];
end else if(BranchInstrF) GHRNextF = {DirPredictionF[1], GHRF[k-1:1]};
else GHRNextF = GHRF;
end
flopenr #(k) GHRFReg(clk, reset, (~StallF) | FlushD, GHRNextF, OldGHRF);
flopenr #(1) GHRFExtraReg(clk, reset, (~StallF) | FlushD, GHRNextF[0], OldGHRExtraF);