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Possible fix for speculative gshare.

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This commit is contained in:
Ross Thompson 2023-01-28 16:14:19 -06:00
parent 6d75e3c22b
commit 8a277f6b75
3 changed files with 68 additions and 55 deletions
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78
pipelined/regression/wave.do
View File

@ -61,10 +61,10 @@ add wave -noupdate -expand -group {Execution Stage} /testbench/dut/core/ifu/Inst
add wave -noupdate -expand -group {Execution Stage} /testbench/InstrEName
add wave -noupdate -expand -group {Execution Stage} /testbench/dut/core/ieu/c/InstrValidE
add wave -noupdate -expand -group {Execution Stage} /testbench/FunctionName/FunctionName/FunctionName
add wave -noupdate -group {Memory Stage} /testbench/dut/core/PCM
add wave -noupdate -group {Memory Stage} /testbench/dut/core/InstrM
add wave -noupdate -group {Memory Stage} /testbench/InstrMName
add wave -noupdate -group {Memory Stage} /testbench/dut/core/lsu/IEUAdrM
add wave -noupdate -expand -group {Memory Stage} /testbench/dut/core/PCM
add wave -noupdate -expand -group {Memory Stage} /testbench/dut/core/InstrM
add wave -noupdate -expand -group {Memory Stage} /testbench/InstrMName
add wave -noupdate -expand -group {Memory Stage} /testbench/dut/core/lsu/IEUAdrM
add wave -noupdate -group {WriteBack stage} /testbench/PCW
add wave -noupdate -group {WriteBack stage} /testbench/InstrW
add wave -noupdate -group {WriteBack stage} /testbench/InstrWName
@ -99,6 +99,7 @@ add wave -noupdate -group Bpred /testbench/dut/core/ifu/bpred/bpred/BPPredWrongE
add wave -noupdate -group {PCNext Generation} /testbench/dut/core/ifu/PCNextF
add wave -noupdate -group {PCNext Generation} /testbench/dut/core/ifu/PCF
add wave -noupdate -group {PCNext Generation} /testbench/dut/core/ifu/PCPlus2or4F
add wave -noupdate -group {PCNext Generation} /testbench/dut/core/ifu/bpred/bpred/PCNext0F
add wave -noupdate -group {PCNext Generation} /testbench/dut/core/ifu/PCNext1F
add wave -noupdate -group {PCNext Generation} /testbench/dut/core/ifu/BPPredWrongE
add wave -noupdate -group RegFile -expand /testbench/dut/core/ieu/dp/regf/rf
@ -573,12 +574,6 @@ add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/WrongPredInstrClassD
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/PredictionInstrClassWrongE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/InstrClassE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/PredInstrClassE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/DirectClassDecode/CompressedOpcF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/DirectClassDecode/InstrClassF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/DirectClassDecode/cjal
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/DirectClassDecode/cj
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/DirectClassDecode/cjr
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/DirectClassDecode/cjalr
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/rd
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/PostSpillInstrRawF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/BTBPredPCWrongM
@ -588,34 +583,47 @@ add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/FallThroughWrongE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/PredInstrClassD
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/InstrClassD
add wave -noupdate -color Firebrick /testbench/dut/core/ifu/bpred/bpred/WrongPredInstrClassD
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/PCSrcE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/DirPredictionE
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/IndexNextF
add wave -noupdate -expand -group {branch direction} -expand -group {branch outcome} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/PCSrcE
add wave -noupdate -expand -group {branch direction} -expand -group {branch outcome} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/DirPredictionE
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/TableDirPredictionF
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/MatchXF
add wave -noupdate -expand -group {branch direction} -expand -group conditions /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/DirPredictionWrongE
add wave -noupdate -expand -group {branch direction} -expand -group conditions /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/BranchInstrE
add wave -noupdate -expand -group {branch direction} -expand -group conditions /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/FlushM
add wave -noupdate -expand -group {branch direction} -expand -group conditions /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/FlushE
add wave -noupdate -expand -group {branch direction} -expand -group ghr /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRF
add wave -noupdate -expand -group {branch direction} -expand -group ghr /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRD
add wave -noupdate -expand -group {branch direction} -expand -group ghr /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRE
add wave -noupdate -expand -group {branch direction} -expand -group ghr /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRM
add wave -noupdate -expand -group {branch direction} -expand -group ghr -color Orange /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRW
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/BranchInstrE
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/OldGHRE
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/BranchInstrF
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/FlushD
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRNextM
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/BranchInstrE
add wave -noupdate -expand -group {branch direction} -expand -group nextghr2 /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRNextF
add wave -noupdate -expand -group {branch direction} -expand -group nextghr2 /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRNextD
add wave -noupdate -expand -group {branch direction} -expand -group nextghr2 /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRNextE
add wave -noupdate -expand -group {branch direction} -expand -group nextghr2 /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRNextM
add wave -noupdate -expand -group {branch direction} -expand -group nextghr2 /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRNextW
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/BranchInstrE
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/NewDirPredictionE
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/IndexE
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/StallM
add wave -noupdate -expand -group {branch direction} /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/FlushM
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/IndexNextF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/TableDirPredictionF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/MatchXF
add wave -noupdate -expand -group ghr /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRF
add wave -noupdate -expand -group ghr /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRD
add wave -noupdate -expand -group ghr /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRE
add wave -noupdate -expand -group ghr /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRM
add wave -noupdate -expand -group ghr -color Orange /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRW
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/OldGHRD
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/BranchInstrE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/OldGHRE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/TargetPredictor/PCNextF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/TargetPredictor/TableBTBPredictionF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/BPPredPCF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/SelBPPredF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/PredValidF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/BranchInstrF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/FlushD
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRNextM
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/BranchInstrE
add wave -noupdate -expand -group nextghr2 /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRNextF
add wave -noupdate -expand -group nextghr2 /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRNextD
add wave -noupdate -expand -group nextghr2 /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRNextE
add wave -noupdate -expand -group nextghr2 /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/GHRNextM
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/BranchInstrE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/NewDirPredictionE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/IndexE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/StallM
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/FlushM
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/OldGHRF
TreeUpdate [SetDefaultTree]
WaveRestoreCursors {{Cursor 2} {314596 ns} 1} {{Cursor 3} {314460 ns} 1} {{Cursor 4} {219681 ns} 1} {{Cursor 4} {5919 ns} 1} {{Cursor 5} {2337 ns} 0}
WaveRestoreCursors {{Cursor 2} {314596 ns} 1} {{Cursor 3} {314460 ns} 1} {{Cursor 4} {219681 ns} 1} {{Cursor 4} {5919 ns} 1} {{Cursor 5} {5845 ns} 0}
quietly wave cursor active 5
configure wave -namecolwidth 250
configure wave -valuecolwidth 194
@ -631,4 +639,4 @@ configure wave -griddelta 40
configure wave -timeline 0
configure wave -timelineunits ns
update
WaveRestoreZoom {2195 ns} {2479 ns}
WaveRestoreZoom {5721 ns} {5893 ns}

2
pipelined/src/ifu/brpred/bpred.sv
View File

@ -28,7 +28,7 @@
`include "wally-config.vh"
`define INSTR_CLASS_PRED 1
`define INSTR_CLASS_PRED 0
module bpred (
input logic clk, reset,

41
pipelined/src/ifu/brpred/speculativegshare.sv
View File

@ -53,10 +53,10 @@ module speculativegshare
logic [k-1:0] GHRF, OldGHRF;
logic OldGHRExtraF;
logic [k:0] GHRD, OldGHRE, GHRE, GHRM, GHRW;
logic [k-1:0] GHRNextF;
logic [k:0] GHRNextD;
logic [k:0] GHRNextE, GHRNextM, GHRNextW;
logic [k-1:0] GHRD, OldGHRE, GHRE, GHRM, GHRW;
logic [k-1:0] GHRNextF;
logic [k-1:0] GHRNextD;
logic [k-1:0] GHRNextE, GHRNextM, GHRNextW;
logic [k-1:0] IndexNextF, IndexF;
logic [k-1:0] IndexD, IndexE;
@ -113,31 +113,36 @@ module speculativegshare
always_comb begin
if(FlushD) begin
if(BranchInstrE) GHRNextF = GHRNextD[k:1];
else GHRNextF = GHRNextD[k-1:0];
//if(BranchInstrE) GHRNextF = {PCSrcE, GHRNextD[k-1:1]};
//else GHRNextF = GHRNextD[k-1:0];
GHRNextF = GHRNextD[k-1:0];
end else if(BranchInstrF) GHRNextF = {DirPredictionF[1], GHRF[k-1:1]};
else GHRNextF = GHRF;
end
flopenr #(k) GHRFReg(clk, reset, (~StallF) | FlushD, GHRNextF, OldGHRF);
flopenr #(1) GHRFExtraReg(clk, reset, (~StallF) | FlushD, GHRNextF[0], OldGHRExtraF);
assign GHRF = WrongPredInstrClassD[0] & BranchInstrD ? {DirPredictionD[1], OldGHRF[k-1:1]} : // shift right
WrongPredInstrClassD[0] & ~BranchInstrD ? {OldGHRF[k-2:0], OldGHRExtraF}: // shift left
OldGHRF[k-1:0];
flopenr #(k) GHRFReg(clk, reset, (~StallF) | FlushD, GHRNextF, GHRF);
//flopenr #(k) GHRFReg(clk, reset, (~StallF) | FlushD, GHRNextF, OldGHRF);
//flopenr #(1) GHRFExtraReg(clk, reset, (~StallF) | FlushD, GHRNextF[0], OldGHRExtraF);
// assign GHRF = WrongPredInstrClassD[0] & BranchInstrD ? {DirPredictionD[1], OldGHRF[k-1:1]} : // shift right
// WrongPredInstrClassD[0] & ~BranchInstrD ? {OldGHRF[k-2:0], OldGHRExtraF}: // shift left
// OldGHRF[k-1:0];
assign GHRNextD = FlushD ? {GHRNextE} : {DirPredictionF[1], GHRF};
//assign GHRNextD = FlushD ? {GHRNextE} : {DirPredictionF[1], GHRF[k-1:1]};
assign GHRNextD = FlushD ? GHRNextE[k-1:0] : GHRF[k-1:0];
flopenr #(k+1) GHRDReg(clk, reset, (~StallD) | FlushD, GHRNextD, GHRD);
flopenr #(k) GHRDReg(clk, reset, (~StallD) | FlushD, GHRNextD, GHRD);
assign GHRNextE = FlushE ? GHRNextM : GHRD;
flopenr #(k+1) GHREReg(clk, reset, (~StallE) | FlushE, GHRNextE, OldGHRE);
assign GHRE = BranchInstrE ? {PCSrcE, OldGHRE[k-1:0]} : OldGHRE;
assign GHRNextE = DirPredictionWrongE & BranchInstrE & ~FlushM ? {PCSrcE, GHRD[k-2:0]} : // if the branch is not flushed and was mispredicted
FlushE ? GHRNextM : // branch is flushed
GHRD;
flopenr #(k) GHREReg(clk, reset, (~StallE) | FlushE, GHRNextE, GHRE);
//assign GHRE = BranchInstrE ? {PCSrcE, OldGHRE[k-1:0]} : OldGHRE;
assign GHRNextM = FlushM ? GHRNextW : GHRE;
flopenr #(k+1) GHRMReg(clk, reset, (~StallM) | FlushM, GHRNextM, GHRM);
flopenr #(k) GHRMReg(clk, reset, (~StallM) | FlushM, GHRNextM, GHRM);
assign GHRNextW = FlushW ? GHRW : GHRM;
flopenr #(k+1) GHRWReg(clk, reset, (BranchInstrM & ~StallW) | FlushW, GHRNextW, GHRW);
flopenr #(k) GHRWReg(clk, reset, (BranchInstrW & ~StallW) | FlushW, GHRNextW, GHRW);
assign DirPredictionWrongE = PCSrcE != DirPredictionE[1] & BranchInstrE;