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Fixed global history predictor.

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This commit is contained in:
Ross Thompson 2023-02-17 16:05:48 -06:00
parent a95be0b567
commit 2f1bebfd57
2 changed files with 14 additions and 13 deletions
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2
src/ifu/bpred/bpred.sv
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@ -101,7 +101,7 @@ module bpred (
end else if (`BPRED_TYPE == "BPGLOBAL") begin:Predictor
globalhistory #(`BPRED_SIZE) DirPredictor(.clk, .reset, .StallF, .StallD, .StallE, .StallM, .FlushD, .FlushE, .FlushM,
.PCNextF, .PCM, .DirPredictionF, .DirPredictionWrongE,
.DirPredictionF, .DirPredictionWrongE,
.BranchInstrE(InstrClassE[0]), .BranchInstrM(InstrClassM[0]), .PCSrcE);
end else if (`BPRED_TYPE == "BPSPECULATIVEGLOBAL") begin:Predictor

25
src/ifu/bpred/globalhistory.sv
View File

@ -28,34 +28,35 @@
`include "wally-config.vh"
module globalhistory #(parameter k = 10) (
module global #(parameter k = 10) (
input logic clk,
input logic reset,
input logic StallF, StallD, StallE, StallM,
input logic FlushD, FlushE, FlushM,
// input logic [`XLEN-1:0] LookUpPC,
input logic StallF, StallD, StallE, StallM, StallW,
input logic FlushD, FlushE, FlushM, FlushW,
output logic [1:0] DirPredictionF,
output logic DirPredictionWrongE,
// update
input logic [`XLEN-1:0] PCNextF, PCM,
input logic BranchInstrE, BranchInstrM, PCSrcE
);
logic [k-1:0] IndexNextF, IndexE;
logic [1:0] DirPredictionD, DirPredictionE;
logic [1:0] NewDirPredictionE, NewDirPredictionM;
logic [k-1:0] GHRF, GHRD, GHRE, GHR;
logic [k-1:0] GHRF, GHRD, GHRE, GHRM, GHR;
logic [k-1:0] GHRNext;
logic PCSrcM;
assign IndexNextF = GHR;
assign IndexE = GHRM;
ram2p1r1wbe #(2**k, 2) PHT(.clk(clk),
.ce1(~StallF), .ce2(~StallM & ~FlushM),
.ra1(GHR),
.ra1(IndexNextF),
.rd1(DirPredictionF),
.wa2(GHRE),
.wd2(NewDirPredictionE),
.we2(BranchInstrE & ~StallM & ~FlushM),
.wa2(IndexE),
.wd2(NewDirPredictionM),
.we2(BranchInstrM & ~StallW & ~FlushW),
.bwe2(1'b1));
flopenrc #(2) PredictionRegD(clk, reset, FlushD, ~StallD, DirPredictionF, DirPredictionD);
@ -66,7 +67,6 @@ module globalhistory #(parameter k = 10) (
assign DirPredictionWrongE = PCSrcE != DirPredictionE[1] & BranchInstrE;
assign GHRNext = BranchInstrM ? {PCSrcM, GHR[k-1:1]} : GHR;
flopenr #(k) GHRReg(clk, reset, ~StallM & ~FlushM & BranchInstrM, GHRNext, GHR);
flopenrc #(1) PCSrcMReg(clk, reset, FlushM, ~StallM, PCSrcE, PCSrcM);
@ -74,6 +74,7 @@ module globalhistory #(parameter k = 10) (
flopenrc #(k) GHRFReg(clk, reset, FlushD, ~StallF, GHR, GHRF);
flopenrc #(k) GHRDReg(clk, reset, FlushD, ~StallD, GHRF, GHRD);
flopenrc #(k) GHREReg(clk, reset, FlushE, ~StallE, GHRD, GHRE);
flopenrc #(k) GHRMReg(clk, reset, FlushM, ~StallM, GHRE, GHRM);
endmodule