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https://github.com/openhwgroup/cvw
synced 2025-02-11 06:05:49 +00:00
Switched to gshare from global history.
Fixed a few minor bugs.
This commit is contained in:
parent
181a28e875
commit
9386e6a524
wally-pipelined
config
busybear
coremark
rv32ic
rv64ic
rv64icfd
src/ifu
@ -89,4 +89,4 @@
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`define TWO_BIT_PRELOAD "../config/busybear/twoBitPredictor.txt"
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`define BTB_PRELOAD "../config/busybear/BTBPredictor.txt"
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`define BPTYPE "BPGLOBAL" // BPGLOBAL or BPTWOBIT or BPGSHARE
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`define BPTYPE "BPGSHARE" // BPGLOBAL or BPTWOBIT or BPGSHARE
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@ -92,4 +92,4 @@
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`define TWO_BIT_PRELOAD "../config/coremark/twoBitPredictor.txt"
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`define BTB_PRELOAD "../config/coremark/BTBPredictor.txt"
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`define BPTYPE "BPGLOBAL" // BPGLOBAL or BPTWOBIT or BPGSHARE
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`define BPTYPE "BPGSHARE" // BPGLOBAL or BPTWOBIT or BPGSHARE
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@ -88,4 +88,4 @@
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`define TWO_BIT_PRELOAD "../config/rv32ic/twoBitPredictor.txt"
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`define BTB_PRELOAD "../config/rv32ic/BTBPredictor.txt"
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`define BPTYPE "BPGLOBAL" // BPGLOBAL or BPTWOBIT or BPGSHARE
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`define BPTYPE "BPGSHARE" // BPGLOBAL or BPTWOBIT or BPGSHARE
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@ -91,4 +91,4 @@
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`define TWO_BIT_PRELOAD "../config/rv64ic/twoBitPredictor.txt"
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`define BTB_PRELOAD "../config/rv64ic/BTBPredictor.txt"
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`define BPTYPE "BPGLOBAL" // BPGLOBAL or BPTWOBIT or BPGSHARE
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`define BPTYPE "BPGSHARE" // BPGLOBAL or BPTWOBIT or BPGSHARE
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@ -91,4 +91,4 @@
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`define TWO_BIT_PRELOAD "../config/rv64icfd/twoBitPredictor.txt"
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`define BTB_PRELOAD "../config/rv64icfd/BTBPredictor.txt"
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`define BPTYPE "BPGLOBAL" // BPGLOBAL or BPTWOBIT or BPGSHARE
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`define BPTYPE "BPGSHARE" // BPGLOBAL or BPTWOBIT or BPGSHARE
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@ -66,7 +66,7 @@ module bpred
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// Part 1 branch direction prediction
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generate
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generate
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if (`BPTYPE == "BPTWOBIT") begin:Predictor
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twoBitPredictor DirPredictor(.clk(clk),
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.reset(reset),
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@ -91,7 +91,7 @@ generate
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.UpdatePrediction(UpdateBPPredE));
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end else if (`BPTYPE == "BPGSHARE") begin:Predictor
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globalHistoryPredictor DirPredictor(.clk(clk),
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gsharePredictor DirPredictor(.clk(clk),
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.reset(reset),
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.*, // Stalls and flushes
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.LookUpPC(PCNextF),
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@ -102,7 +102,7 @@ generate
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.PCSrcE(PCSrcE),
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.UpdatePrediction(UpdateBPPredE));
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end
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endgenerate
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endgenerate
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// this predictor will have two pieces of data,
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@ -41,8 +41,13 @@ module gsharePredictor
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input logic [1:0] UpdatePrediction
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);
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localparam int Depth = 2^k;
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logic [k-1:0] GHRF, GHRD, GHRE;
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logic [k-1:0] LookUpPCIndexD, LookUpPCIndexE;
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logic [k-1:0] LookUpPCIndex, UpdatePCIndex;
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logic [1:0] PredictionMemory;
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logic DoForwarding, DoForwardingF;
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logic [1:0] UpdatePredictionF;
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flopenr #(k) GlobalHistoryRegister(.clk(clk),
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.reset(reset),
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@ -51,18 +56,13 @@ module gsharePredictor
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.q(GHRF));
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logic [k-1:0] LookUpPCIndex, UpdatePCIndex;
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logic [1:0] PredictionMemory;
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logic DoForwarding, DoForwardingF;
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logic [1:0] UpdatePredictionF;
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// for gshare xor the PC with the GHR
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assign UpdatePCIndex = GHRE ^ UpdatePC[k-1:0];
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assign LookUpPCIndex = LookUpPC ^ GHRF[k-1:0];
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assign UpdatePCIndex = GHRE ^ UpdatePC[k:1];
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assign LookUpPCIndex = GHRF ^ LookUpPC[k:1];
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// Make Prediction by reading the correct address in the PHT and also update the new address in the PHT
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// GHR referes to the address that the past k branches points to in the prediction stage
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// GHRE refers to the address that the past k branches points to in the exectution stage
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SRAM2P1R1W #(Depth, 2) PHT(.clk(clk),
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SRAM2P1R1W #(k, 2) PHT(.clk(clk),
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.reset(reset),
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.RA1(LookUpPCIndex),
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.RD1(PredictionMemory),
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