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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

6
wally-pipelined/src/ifu/bpred.sv
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@ -66,7 +66,7 @@ module bpred
// Part 1 branch direction prediction
generate
generate
if (`BPTYPE == "BPTWOBIT") begin:Predictor
twoBitPredictor DirPredictor(.clk(clk),
.reset(reset),
@ -91,7 +91,7 @@ generate
.UpdatePrediction(UpdateBPPredE));
end else if (`BPTYPE == "BPGSHARE") begin:Predictor
globalHistoryPredictor DirPredictor(.clk(clk),
gsharePredictor DirPredictor(.clk(clk),
.reset(reset),
.*, // Stalls and flushes
.LookUpPC(PCNextF),
@ -102,7 +102,7 @@ generate
.PCSrcE(PCSrcE),
.UpdatePrediction(UpdateBPPredE));
end
endgenerate
endgenerate
// this predictor will have two pieces of data,

18
wally-pipelined/src/ifu/gshare.sv
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@ -41,8 +41,13 @@ module gsharePredictor
input logic [1:0] UpdatePrediction
);
localparam int Depth = 2^k;
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),
@ -51,18 +56,13 @@ module gsharePredictor
.q(GHRF));
logic [k-1:0] LookUpPCIndex, UpdatePCIndex;
logic [1:0] PredictionMemory;
logic DoForwarding, DoForwardingF;
logic [1:0] UpdatePredictionF;
// 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),
SRAM2P1R1W #(k, 2) PHT(.clk(clk),
.reset(reset),
.RA1(LookUpPCIndex),
.RD1(PredictionMemory),