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Switched to gshare from global history.

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Fixed a few minor bugs.
This commit is contained in:
Ross Thompson 2021-03-18 16:05:59 -05:00
parent 8f4051543c
commit 1091dd10c1
7 changed files with 68 additions and 68 deletions
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2
wally-pipelined/config/busybear/wally-config.vh
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@ -89,4 +89,4 @@
`define TWO_BIT_PRELOAD "../config/busybear/twoBitPredictor.txt"
`define BTB_PRELOAD "../config/busybear/BTBPredictor.txt"
`define BPTYPE "BPGLOBAL" // BPGLOBAL or BPTWOBIT or BPGSHARE
`define BPTYPE "BPGSHARE" // BPGLOBAL or BPTWOBIT or BPGSHARE

2
wally-pipelined/config/coremark/wally-config.vh
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@ -92,4 +92,4 @@
`define TWO_BIT_PRELOAD "../config/coremark/twoBitPredictor.txt"
`define BTB_PRELOAD "../config/coremark/BTBPredictor.txt"
`define BPTYPE "BPGLOBAL" // BPGLOBAL or BPTWOBIT or BPGSHARE
`define BPTYPE "BPGSHARE" // BPGLOBAL or BPTWOBIT or BPGSHARE

2
wally-pipelined/config/rv32ic/wally-config.vh
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@ -88,4 +88,4 @@
`define TWO_BIT_PRELOAD "../config/rv32ic/twoBitPredictor.txt"
`define BTB_PRELOAD "../config/rv32ic/BTBPredictor.txt"
`define BPTYPE "BPGLOBAL" // BPGLOBAL or BPTWOBIT or BPGSHARE
`define BPTYPE "BPGSHARE" // BPGLOBAL or BPTWOBIT or BPGSHARE

2
wally-pipelined/config/rv64ic/wally-config.vh
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@ -91,4 +91,4 @@
`define TWO_BIT_PRELOAD "../config/rv64ic/twoBitPredictor.txt"
`define BTB_PRELOAD "../config/rv64ic/BTBPredictor.txt"
`define BPTYPE "BPGLOBAL" // BPGLOBAL or BPTWOBIT or BPGSHARE
`define BPTYPE "BPGSHARE" // BPGLOBAL or BPTWOBIT or BPGSHARE

2
wally-pipelined/config/rv64icfd/wally-config.vh
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@ -91,4 +91,4 @@
`define TWO_BIT_PRELOAD "../config/rv64icfd/twoBitPredictor.txt"
`define BTB_PRELOAD "../config/rv64icfd/BTBPredictor.txt"
`define BPTYPE "BPGLOBAL" // BPGLOBAL or BPTWOBIT or BPGSHARE
`define BPTYPE "BPGSHARE" // BPGLOBAL or BPTWOBIT or BPGSHARE

62
wally-pipelined/src/ifu/bpred.sv
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@ -66,43 +66,43 @@ module bpred
// Part 1 branch direction prediction
generate
if (`BPTYPE == "BPTWOBIT") begin:Predictor
twoBitPredictor DirPredictor(.clk(clk),
.reset(reset),
.LookUpPC(PCNextF),
.Prediction(BPPredF),
// update
.UpdatePC(PCE),
.UpdateEN(InstrClassE[0]),
.UpdatePrediction(UpdateBPPredE));
generate
if (`BPTYPE == "BPTWOBIT") begin:Predictor
twoBitPredictor DirPredictor(.clk(clk),
.reset(reset),
.LookUpPC(PCNextF),
.Prediction(BPPredF),
// update
.UpdatePC(PCE),
.UpdateEN(InstrClassE[0]),
.UpdatePrediction(UpdateBPPredE));
end else if (`BPTYPE == "BPGLOBAL") begin:Predictor
globalHistoryPredictor DirPredictor(.clk(clk),
.reset(reset),
.*, // Stalls and flushes
.LookUpPC(PCNextF),
.Prediction(BPPredF),
// update
.UpdatePC(PCE),
.UpdateEN(InstrClassE[0]),
.PCSrcE(PCSrcE),
.UpdatePrediction(UpdateBPPredE));
.reset(reset),
.*, // Stalls and flushes
.LookUpPC(PCNextF),
.Prediction(BPPredF),
// update
.UpdatePC(PCE),
.UpdateEN(InstrClassE[0]),
.PCSrcE(PCSrcE),
.UpdatePrediction(UpdateBPPredE));
end else if (`BPTYPE == "BPGSHARE") begin:Predictor
globalHistoryPredictor DirPredictor(.clk(clk),
.reset(reset),
.*, // Stalls and flushes
.LookUpPC(PCNextF),
.Prediction(BPPredF),
// update
.UpdatePC(PCE),
.UpdateEN(InstrClassE[0]),
.PCSrcE(PCSrcE),
.UpdatePrediction(UpdateBPPredE));
end
endgenerate
gsharePredictor DirPredictor(.clk(clk),
.reset(reset),
.*, // Stalls and flushes
.LookUpPC(PCNextF),
.Prediction(BPPredF),
// update
.UpdatePC(PCE),
.UpdateEN(InstrClassE[0]),
.PCSrcE(PCSrcE),
.UpdatePrediction(UpdateBPPredE));
end
endgenerate
// this predictor will have two pieces of data,

64
wally-pipelined/src/ifu/gshare.sv
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@ -32,45 +32,45 @@ module gsharePredictor
)
(input logic clk,
input logic reset,
input logic StallF, StallD, StallE, FlushF, FlushD, FlushE,
input logic StallF, StallD, StallE, FlushF, FlushD, FlushE,
input logic [`XLEN-1:0] LookUpPC,
output logic [1:0] Prediction,
// update
input logic [`XLEN-1:0] UpdatePC,
input logic UpdateEN, PCSrcE,
input logic [1:0] UpdatePrediction
);
localparam int Depth = 2^k;
logic [k-1:0] GHRF, GHRD, GHRE;
flopenr #(k) GlobalHistoryRegister(.clk(clk),
.reset(reset),
.en(UpdateEN),
.d({PCSrcE, GHRF[k-1:1] }),
.q(GHRF));
logic [k-1:0] GHRF, GHRD, GHRE;
logic [k-1:0] LookUpPCIndexD, LookUpPCIndexE;
logic [k-1:0] LookUpPCIndex, UpdatePCIndex;
logic [1:0] PredictionMemory;
logic DoForwarding, DoForwardingF;
logic [1:0] UpdatePredictionF;
flopenr #(k) GlobalHistoryRegister(.clk(clk),
.reset(reset),
.en(UpdateEN),
.d({PCSrcE, GHRF[k-1:1] }),
.q(GHRF));
// for gshare xor the PC with the GHR
assign UpdatePCIndex = GHRE ^ UpdatePC[k-1:0];
assign LookUpPCIndex = LookUpPC ^ GHRF[k-1:0];
assign UpdatePCIndex = GHRE ^ UpdatePC[k:1];
assign LookUpPCIndex = GHRF ^ LookUpPC[k:1];
// Make Prediction by reading the correct address in the PHT and also update the new address in the PHT
// GHR referes to the address that the past k branches points to in the prediction stage
// GHRE refers to the address that the past k branches points to in the exectution stage
SRAM2P1R1W #(Depth, 2) PHT(.clk(clk),
.reset(reset),
.RA1(LookUpPCIndex),
.RD1(PredictionMemory),
.REN1(1'b1),
.WA1(UpdatePCIndex),
.WD1(UpdatePrediction),
.WEN1(UpdateEN),
.BitWEN1(2'b11));
SRAM2P1R1W #(k, 2) PHT(.clk(clk),
.reset(reset),
.RA1(LookUpPCIndex),
.RD1(PredictionMemory),
.REN1(1'b1),
.WA1(UpdatePCIndex),
.WD1(UpdatePrediction),
.WEN1(UpdateEN),
.BitWEN1(2'b11));
// need to forward when updating to the same address as reading.
@ -93,17 +93,17 @@ module gsharePredictor
//pipeline for GHR
flopenrc #(k) LookUpDReg(.clk(clk),
.reset(reset),
.en(~StallD),
.clear(FlushD),
.d(LookUpPCIndex),
.q(LookUpPCIndexD));
.reset(reset),
.en(~StallD),
.clear(FlushD),
.d(LookUpPCIndex),
.q(LookUpPCIndexD));
flopenrc #(k) LookUpEReg(.clk(clk),
.reset(reset),
.en(~StallE),
.clear(FlushE),
.d(LookUpPCIndexD),
.q(LookUpPCIndexE));
.reset(reset),
.en(~StallE),
.clear(FlushE),
.d(LookUpPCIndexD),
.q(LookUpPCIndexE));
endmodule