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Optomized gshare.

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This commit is contained in:
Ross Thompson 2023-01-25 11:41:16 -06:00
parent a5bd78a622
commit 5030a56f57
1 changed files with 7 additions and 10 deletions
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17
pipelined/src/ifu/brpred/speculativegshare.sv
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@ -45,7 +45,7 @@ module speculativegshare
input logic PCSrcE
);
logic MatchF, MatchD, MatchE, MatchM;
logic MatchF, MatchD, MatchE;
logic MatchNextX, MatchXF;
logic [1:0] TableDirPredictionF, DirPredictionD, DirPredictionE;
@ -57,7 +57,7 @@ module speculativegshare
logic [k:-1] GHRNextD, OldGHRD;
logic [k:0] GHRNextE, GHRNextM, GHRNextW;
logic [k-1:0] IndexNextF, IndexF;
logic [k-1:0] IndexD, IndexE, IndexM;
logic [k-1:0] IndexD, IndexE;
logic PCSrcM, PCSrcW;
logic [`XLEN-1:0] PCW;
@ -68,15 +68,14 @@ module speculativegshare
assign IndexF = GHRF ^ {PCF[k+1] ^ PCF[1], PCF[k:2]};
assign IndexD = GHRD[k-1:0] ^ {PCD[k+1] ^ PCD[1], PCD[k:2]};
assign IndexE = GHRE[k-1:0] ^ {PCE[k+1] ^ PCE[1], PCE[k:2]};
assign IndexM = GHRM[k-1:0] ^ {PCM[k+1] ^ PCM[1], PCM[k:2]};
ram2p1r1wbe #(2**k, 2) PHT(.clk(clk),
.ce1(~StallF | reset), .ce2(~StallW & ~FlushW),
.ra1(IndexNextF),
.rd1(TableDirPredictionF),
.wa2(IndexM),
.wd2(NewDirPredictionM),
.we2(BranchInstrM & ~StallW & ~FlushW),
.wa2(IndexE),
.wd2(NewDirPredictionE),
.we2(BranchInstrE & ~StallM & ~FlushM),
.bwe2(1'b1));
// if there are non-flushed branches in the pipeline we need to forward the prediction from that stage to the NextF demi stage
@ -84,15 +83,13 @@ module speculativegshare
assign MatchF = BranchInstrF & ~FlushD & (IndexNextF == IndexF);
assign MatchD = BranchInstrD & ~FlushE & (IndexNextF == IndexD);
assign MatchE = BranchInstrE & ~FlushM & (IndexNextF == IndexE);
assign MatchM = BranchInstrM & ~FlushW & (IndexNextF == IndexM);
assign MatchNextX = MatchF | MatchD | MatchE | MatchM;
assign MatchNextX = MatchF | MatchD | MatchE;
flopenr #(1) MatchReg(clk, reset, ~StallF, MatchNextX, MatchXF);
assign ForwardNewDirPrediction = MatchF ? NewDirPredictionF :
MatchD ? NewDirPredictionD :
MatchE ? NewDirPredictionE :
NewDirPredictionM;
NewDirPredictionE ;
flopenr #(2) ForwardDirPredicitonReg(clk, reset, ~StallF, ForwardNewDirPrediction, ForwardDirPredictionF);