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Changed the performance counters to track different data.

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Now rather than tracking jump(r) we track jump(r) and taken branches.
This commit is contained in:
Ross Thompson 2023-01-26 13:21:16 -06:00
parent 6025bbc9ae
commit 4fa2dcc2a5
7 changed files with 72 additions and 16 deletions
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35
pipelined/regression/wave.do
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@ -1,4 +1,5 @@
onerror {resume} onerror {resume}
quietly virtual signal -install /testbench/dut/core/ifu/bpred/bpred { /testbench/dut/core/ifu/bpred/bpred/PostSpillInstrRawF[11:7]} rd
quietly WaveActivateNextPane {} 0 quietly WaveActivateNextPane {} 0
add wave -noupdate /testbench/clk add wave -noupdate /testbench/clk
add wave -noupdate /testbench/reset add wave -noupdate /testbench/reset
@ -36,11 +37,11 @@ add wave -noupdate -group HDU -expand -group Stall -color Orange /testbench/dut/
add wave -noupdate -group HDU -expand -group Stall -color Orange /testbench/dut/core/StallE add wave -noupdate -group HDU -expand -group Stall -color Orange /testbench/dut/core/StallE
add wave -noupdate -group HDU -expand -group Stall -color Orange /testbench/dut/core/StallM add wave -noupdate -group HDU -expand -group Stall -color Orange /testbench/dut/core/StallM
add wave -noupdate -group HDU -expand -group Stall -color Orange /testbench/dut/core/StallW add wave -noupdate -group HDU -expand -group Stall -color Orange /testbench/dut/core/StallW
add wave -noupdate -group {instruction pipeline} /testbench/InstrFName add wave -noupdate -expand -group {instruction pipeline} /testbench/InstrFName
add wave -noupdate -group {instruction pipeline} /testbench/dut/core/ifu/PostSpillInstrRawF add wave -noupdate -expand -group {instruction pipeline} /testbench/dut/core/ifu/PostSpillInstrRawF
add wave -noupdate -group {instruction pipeline} /testbench/dut/core/ifu/InstrD add wave -noupdate -expand -group {instruction pipeline} /testbench/dut/core/ifu/InstrD
add wave -noupdate -group {instruction pipeline} /testbench/dut/core/ifu/InstrE add wave -noupdate -expand -group {instruction pipeline} /testbench/dut/core/ifu/InstrE
add wave -noupdate -group {instruction pipeline} /testbench/dut/core/ifu/InstrM add wave -noupdate -expand -group {instruction pipeline} /testbench/dut/core/ifu/InstrM
add wave -noupdate -group PCS /testbench/dut/core/ifu/PCNextF add wave -noupdate -group PCS /testbench/dut/core/ifu/PCNextF
add wave -noupdate -group PCS /testbench/dut/core/PCF add wave -noupdate -group PCS /testbench/dut/core/PCF
add wave -noupdate -group PCS /testbench/dut/core/ifu/PCD add wave -noupdate -group PCS /testbench/dut/core/ifu/PCD
@ -567,8 +568,28 @@ add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/RASPredictor/PtrQ
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/RASPredictor/PopF add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/RASPredictor/PopF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/RASPredictor/PushE add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/RASPredictor/PushE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/RASPredictor/RASPCF add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/RASPredictor/RASPCF
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/RASPredictor/RepairD
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
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/PredictionPCWrongE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/TargetWrongE
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
TreeUpdate [SetDefaultTree] TreeUpdate [SetDefaultTree]
WaveRestoreCursors {{Cursor 2} {314596 ns} 1} {{Cursor 3} {314460 ns} 1} {{Cursor 4} {219681 ns} 1} {{Cursor 4} {341201 ns} 1} {{Cursor 5} {117097 ns} 0} WaveRestoreCursors {{Cursor 2} {314596 ns} 1} {{Cursor 3} {314460 ns} 1} {{Cursor 4} {219681 ns} 1} {{Cursor 4} {341201 ns} 1} {{Cursor 5} {48955828 ns} 0}
quietly wave cursor active 5 quietly wave cursor active 5
configure wave -namecolwidth 250 configure wave -namecolwidth 250
configure wave -valuecolwidth 194 configure wave -valuecolwidth 194
@ -584,4 +605,4 @@ configure wave -griddelta 40
configure wave -timeline 0 configure wave -timeline 0
configure wave -timelineunits ns configure wave -timelineunits ns
update update
WaveRestoreZoom {117047 ns} {117181 ns} WaveRestoreZoom {48955732 ns} {48955990 ns}

36
pipelined/src/ifu/brpred/bpred.sv
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@ -55,6 +55,7 @@ module bpred (
input logic [`XLEN-1:0] IEUAdrE, // The branch/jump target address input logic [`XLEN-1:0] IEUAdrE, // The branch/jump target address
input logic [`XLEN-1:0] PCLinkE, // The address following the branch instruction. (AKA Fall through address) input logic [`XLEN-1:0] PCLinkE, // The address following the branch instruction. (AKA Fall through address)
output logic [3:0] InstrClassM, // The valid instruction class. 1-hot encoded as jalr, ret, jr (not ret), j, br output logic [3:0] InstrClassM, // The valid instruction class. 1-hot encoded as jalr, ret, jr (not ret), j, br
output logic JumpOrTakenBranchM, // The valid instruction class. 1-hot encoded as jalr, ret, jr (not ret), j, br
// Report branch prediction status // Report branch prediction status
output logic BPPredWrongE, // Prediction is wrong output logic BPPredWrongE, // Prediction is wrong
@ -82,7 +83,18 @@ module bpred (
logic [`XLEN-1:0] PCNext0F; logic [`XLEN-1:0] PCNext0F;
logic [`XLEN-1:0] PCCorrectE; logic [`XLEN-1:0] PCCorrectE;
logic [3:0] WrongPredInstrClassD; logic [3:0] WrongPredInstrClassD;
//************ new resolve issues
logic BTBTargetWrongE;
logic RASTargetWrongE;
logic JumpOrTakenBranchE;
logic [`XLEN-1:0] PredPCD, PredPCE, RASPCD, RASPCE;
// Part 1 branch direction prediction // Part 1 branch direction prediction
// look into the 2 port Sram model. something is wrong. // look into the 2 port Sram model. something is wrong.
if (`BPTYPE == "BPTWOBIT") begin:Predictor if (`BPTYPE == "BPTWOBIT") begin:Predictor
@ -200,6 +212,7 @@ module bpred (
flopenrc #(4) InstrClassRegM(clk, reset, FlushM, ~StallM, InstrClassE, InstrClassM); flopenrc #(4) InstrClassRegM(clk, reset, FlushM, ~StallM, InstrClassE, InstrClassM);
flopenrc #(4) InstrClassRegW(clk, reset, FlushW, ~StallW, InstrClassM, InstrClassW); flopenrc #(4) InstrClassRegW(clk, reset, FlushW, ~StallW, InstrClassM, InstrClassW);
flopenrc #(1) BPPredWrongMReg(clk, reset, FlushM, ~StallM, BPPredWrongE, BPPredWrongM); flopenrc #(1) BPPredWrongMReg(clk, reset, FlushM, ~StallM, BPPredWrongE, BPPredWrongM);
flopenrc #(1) JumpOrTakenBranchMReg(clk, reset, FlushM, ~StallM, JumpOrTakenBranchE, JumpOrTakenBranchM);
// branch predictor // branch predictor
flopenrc #(4) BPPredWrongRegM(clk, reset, FlushM, ~StallM, flopenrc #(4) BPPredWrongRegM(clk, reset, FlushM, ~StallM,
@ -234,9 +247,13 @@ module bpred (
assign BPPredWrongE = (PredictionPCWrongE & |InstrClassE) | BPPredClassNonCFIWrongE; assign BPPredWrongE = (PredictionPCWrongE & |InstrClassE) | BPPredClassNonCFIWrongE;
// If we have a jump, jump register or jal or jalr and the PC is wrong we need to increment the performance counter. // If we have a jump, jump register or jal or jalr and the PC is wrong we need to increment the performance counter.
assign BTBPredPCWrongE = (InstrClassE[3] | InstrClassE[1] | InstrClassE[0]) & PredictionPCWrongE; //assign BTBPredPCWrongE = (InstrClassE[3] | InstrClassE[1] | InstrClassE[0]) & PredictionPCWrongE;
//assign BTBPredPCWrongE = TargetWrongE & (InstrClassE[3] | InstrClassE[1] | InstrClassE[0]) & PCSrcE;
assign BTBPredPCWrongE = BTBTargetWrongE;
// similar with RAS. Over counts ras if the class prediction was wrong. // similar with RAS. Over counts ras if the class prediction was wrong.
assign RASPredPCWrongE = InstrClassE[2] & PredictionPCWrongE; //assign RASPredPCWrongE = TargetWrongE & InstrClassE[2] & PCSrcE;
assign RASPredPCWrongE = RASTargetWrongE;
// Finally if the real instruction class is non CFI but the predictor said it was we need to count. // Finally if the real instruction class is non CFI but the predictor said it was we need to count.
assign BPPredClassNonCFIWrongE = PredictionInstrClassWrongE & ~|InstrClassE; assign BPPredClassNonCFIWrongE = PredictionInstrClassWrongE & ~|InstrClassE;
@ -260,10 +277,23 @@ module bpred (
// end // end
// performance counters // performance counters
// 1. class (class wrong / minstret) (PredictionInstrClassWrongM / csr) // 1. class (class wrong / minstret) (PredictionInstrClassWrongM / csr) // Correct now
// 2. target btb (btb target wrong / class[0,1,3]) (btb target wrong / (br + j + jal) // 2. target btb (btb target wrong / class[0,1,3]) (btb target wrong / (br + j + jal)
// 3. target ras (ras target wrong / class[2]) // 3. target ras (ras target wrong / class[2])
// 4. direction (br dir wrong / class[0]) // 4. direction (br dir wrong / class[0])
assign BTBTargetWrongE = (PredPCE != IEUAdrE) & (InstrClassE[0] | InstrClassE[1] | InstrClassE[3]) & PCSrcE;
assign RASTargetWrongE = (RASPCE != IEUAdrE) & InstrClassE[2] & PCSrcE;
assign JumpOrTakenBranchE = (InstrClassE[0] & PCSrcE) | InstrClassE[1] | InstrClassE[3];
flopenrc #(`XLEN) BTBTargetDReg(clk, reset, FlushD, ~StallD, PredPCF, PredPCD);
flopenrc #(`XLEN) BTBTargetEReg(clk, reset, FlushE, ~StallE, PredPCD, PredPCE);
flopenrc #(`XLEN) RASTargetDReg(clk, reset, FlushD, ~StallD, RASPCF, RASPCD);
flopenrc #(`XLEN) RASTargetEReg(clk, reset, FlushE, ~StallE, RASPCD, RASPCE);
endmodule endmodule

3
pipelined/src/ifu/ifu.sv
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@ -60,6 +60,7 @@ module ifu (
output logic [`XLEN-1:0] PCM, // Memory stage instruction address output logic [`XLEN-1:0] PCM, // Memory stage instruction address
// branch predictor // branch predictor
output logic [3:0] InstrClassM, // The valid instruction class. 1-hot encoded as jalr, ret, jr (not ret), j, br output logic [3:0] InstrClassM, // The valid instruction class. 1-hot encoded as jalr, ret, jr (not ret), j, br
output logic JumpOrTakenBranchM,
output logic DirPredictionWrongM, // Prediction direction is wrong output logic DirPredictionWrongM, // Prediction direction is wrong
output logic BTBPredPCWrongM, // Prediction target wrong output logic BTBPredPCWrongM, // Prediction target wrong
output logic RASPredPCWrongM, // RAS prediction is wrong output logic RASPredPCWrongM, // RAS prediction is wrong
@ -327,7 +328,7 @@ module ifu (
.StallF, .StallD, .StallE, .StallM, .StallW, .StallF, .StallD, .StallE, .StallM, .StallW,
.FlushD, .FlushE, .FlushM, .FlushW, .FlushD, .FlushE, .FlushM, .FlushW,
.InstrD, .PCNextF, .PCPlus2or4F, .PCNext1F, .PCE, .PCM, .PCSrcE, .IEUAdrE, .PCF, .NextValidPCE, .InstrD, .PCNextF, .PCPlus2or4F, .PCNext1F, .PCE, .PCM, .PCSrcE, .IEUAdrE, .PCF, .NextValidPCE,
.PCD, .PCLinkE, .InstrClassM, .BPPredWrongE, .PostSpillInstrRawF, .PCD, .PCLinkE, .InstrClassM, .BPPredWrongE, .PostSpillInstrRawF, .JumpOrTakenBranchM,
.DirPredictionWrongM, .BTBPredPCWrongM, .RASPredPCWrongM, .PredictionInstrClassWrongM); .DirPredictionWrongM, .BTBPredPCWrongM, .RASPredPCWrongM, .PredictionInstrClassWrongM);
end else begin : bpred end else begin : bpred

3
pipelined/src/privileged/csr.sv
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@ -62,6 +62,7 @@ module csr #(parameter
input logic RASPredPCWrongM, input logic RASPredPCWrongM,
input logic PredictionInstrClassWrongM, input logic PredictionInstrClassWrongM,
input logic [3:0] InstrClassM, input logic [3:0] InstrClassM,
input logic JumpOrTakenBranchM, // actual instruction class
input logic DCacheMiss, input logic DCacheMiss,
input logic DCacheAccess, input logic DCacheAccess,
input logic ICacheMiss, input logic ICacheMiss,
@ -255,7 +256,7 @@ module csr #(parameter
if (`ZICOUNTERS_SUPPORTED) begin:counters if (`ZICOUNTERS_SUPPORTED) begin:counters
csrc counters(.clk, .reset, .StallE, .StallM, .FlushM, csrc counters(.clk, .reset, .StallE, .StallM, .FlushM,
.InstrValidNotFlushedM, .LoadStallD, .CSRMWriteM, .InstrValidNotFlushedM, .LoadStallD, .CSRMWriteM,
.DirPredictionWrongM, .BTBPredPCWrongM, .RASPredPCWrongM, .PredictionInstrClassWrongM, .DirPredictionWrongM, .BTBPredPCWrongM, .RASPredPCWrongM, .PredictionInstrClassWrongM, .JumpOrTakenBranchM,
.InstrClassM, .DCacheMiss, .DCacheAccess, .ICacheMiss, .ICacheAccess, .InstrClassM, .DCacheMiss, .DCacheAccess, .ICacheMiss, .ICacheAccess,
.CSRAdrM, .PrivilegeModeW, .CSRWriteValM, .CSRAdrM, .PrivilegeModeW, .CSRWriteValM,
.MCOUNTINHIBIT_REGW, .MCOUNTEREN_REGW, .SCOUNTEREN_REGW, .MCOUNTINHIBIT_REGW, .MCOUNTEREN_REGW, .SCOUNTEREN_REGW,

3
pipelined/src/privileged/csrc.sv
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@ -49,6 +49,7 @@ module csrc #(parameter
input logic RASPredPCWrongM, input logic RASPredPCWrongM,
input logic PredictionInstrClassWrongM, input logic PredictionInstrClassWrongM,
input logic [3:0] InstrClassM, input logic [3:0] InstrClassM,
input logic JumpOrTakenBranchM, // actual instruction class
input logic DCacheMiss, input logic DCacheMiss,
input logic DCacheAccess, input logic DCacheAccess,
input logic ICacheMiss, input logic ICacheMiss,
@ -87,7 +88,7 @@ module csrc #(parameter
assign CounterEvent[4] = DirPredictionWrongM & InstrValidNotFlushedM; // Branch predictor wrong direction assign CounterEvent[4] = DirPredictionWrongM & InstrValidNotFlushedM; // Branch predictor wrong direction
assign CounterEvent[5] = InstrClassM[0] & InstrValidNotFlushedM; // branch instruction assign CounterEvent[5] = InstrClassM[0] & InstrValidNotFlushedM; // branch instruction
assign CounterEvent[6] = BTBPredPCWrongM & InstrValidNotFlushedM; // branch predictor wrong target assign CounterEvent[6] = BTBPredPCWrongM & InstrValidNotFlushedM; // branch predictor wrong target
assign CounterEvent[7] = (InstrClassM[3] | InstrClassM[1]) & InstrValidNotFlushedM; // jump instructions assign CounterEvent[7] = JumpOrTakenBranchM & InstrValidNotFlushedM; // jump or taken branch instructions
assign CounterEvent[8] = RASPredPCWrongM & InstrValidNotFlushedM; // return address stack wrong address assign CounterEvent[8] = RASPredPCWrongM & InstrValidNotFlushedM; // return address stack wrong address
assign CounterEvent[9] = InstrClassM[2] & InstrValidNotFlushedM; // return instructions assign CounterEvent[9] = InstrClassM[2] & InstrValidNotFlushedM; // return instructions
assign CounterEvent[10] = PredictionInstrClassWrongM & InstrValidNotFlushedM; // instruction class predictor wrong assign CounterEvent[10] = PredictionInstrClassWrongM & InstrValidNotFlushedM; // instruction class predictor wrong

3
pipelined/src/privileged/privileged.sv
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@ -51,6 +51,7 @@ module privileged (
input logic RASPredPCWrongM, // return adddress stack guessed wrong target input logic RASPredPCWrongM, // return adddress stack guessed wrong target
input logic PredictionInstrClassWrongM, // branch predictor guessed wrong instruction class input logic PredictionInstrClassWrongM, // branch predictor guessed wrong instruction class
input logic [3:0] InstrClassM, // actual instruction class input logic [3:0] InstrClassM, // actual instruction class
input logic JumpOrTakenBranchM, // actual instruction class
input logic DCacheMiss, // data cache miss input logic DCacheMiss, // data cache miss
input logic DCacheAccess, // data cache accessed (hit or miss) input logic DCacheAccess, // data cache accessed (hit or miss)
input logic ICacheMiss, // instruction cache miss input logic ICacheMiss, // instruction cache miss
@ -124,7 +125,7 @@ module privileged (
.MTimerInt, .MExtInt, .SExtInt, .MSwInt, .MTimerInt, .MExtInt, .SExtInt, .MSwInt,
.MTIME_CLINT, .InstrValidM, .FRegWriteM, .LoadStallD, .MTIME_CLINT, .InstrValidM, .FRegWriteM, .LoadStallD,
.DirPredictionWrongM, .BTBPredPCWrongM, .RASPredPCWrongM, .DirPredictionWrongM, .BTBPredPCWrongM, .RASPredPCWrongM,
.PredictionInstrClassWrongM, .InstrClassM, .DCacheMiss, .DCacheAccess, .ICacheMiss, .ICacheAccess, .PredictionInstrClassWrongM, .InstrClassM, .DCacheMiss, .DCacheAccess, .ICacheMiss, .ICacheAccess, .JumpOrTakenBranchM,
.NextPrivilegeModeM, .PrivilegeModeW, .CauseM, .SelHPTW, .NextPrivilegeModeM, .PrivilegeModeW, .CauseM, .SelHPTW,
.STATUS_MPP, .STATUS_SPP, .STATUS_TSR, .STATUS_TVM, .STATUS_MPP, .STATUS_SPP, .STATUS_TSR, .STATUS_TVM,
.STATUS_MIE, .STATUS_SIE, .STATUS_MXR, .STATUS_SUM, .STATUS_MPRV, .STATUS_TW, .STATUS_FS, .STATUS_MIE, .STATUS_SIE, .STATUS_MXR, .STATUS_SUM, .STATUS_MPRV, .STATUS_TW, .STATUS_FS,

5
pipelined/src/wally/wallypipelinedcore.sv
View File

@ -161,6 +161,7 @@ module wallypipelinedcore (
logic BigEndianM; logic BigEndianM;
logic FCvtIntE; logic FCvtIntE;
logic CommittedF; logic CommittedF;
logic JumpOrTakenBranchM;
// Bit manipulation unit // Bit manipulation unit
logic [`XLEN-1:0] BMUResultE; // Bit manipuation result BMU -> IEU logic [`XLEN-1:0] BMUResultE; // Bit manipuation result BMU -> IEU
@ -177,7 +178,7 @@ module wallypipelinedcore (
.PCLinkE, .PCSrcE, .IEUAdrE, .PCE, .BPPredWrongE, .PCLinkE, .PCSrcE, .IEUAdrE, .PCE, .BPPredWrongE,
// Mem // Mem
.CommittedF, .UnalignedPCNextF, .InvalidateICacheM, .CSRWriteFenceM, .CommittedF, .UnalignedPCNextF, .InvalidateICacheM, .CSRWriteFenceM,
.InstrD, .InstrM, .PCM, .InstrClassM, .DirPredictionWrongM, .InstrD, .InstrM, .PCM, .InstrClassM, .DirPredictionWrongM, .JumpOrTakenBranchM,
.BTBPredPCWrongM, .RASPredPCWrongM, .PredictionInstrClassWrongM, .BTBPredPCWrongM, .RASPredPCWrongM, .PredictionInstrClassWrongM,
// Faults out // Faults out
.IllegalBaseInstrFaultD, .InstrPageFaultF, .IllegalIEUInstrFaultD, .InstrMisalignedFaultM, .IllegalBaseInstrFaultD, .InstrPageFaultF, .IllegalIEUInstrFaultD, .InstrMisalignedFaultM,
@ -291,7 +292,7 @@ module wallypipelinedcore (
.FRegWriteM, .LoadStallD, .FRegWriteM, .LoadStallD,
.DirPredictionWrongM, .BTBPredPCWrongM, .DirPredictionWrongM, .BTBPredPCWrongM,
.RASPredPCWrongM, .PredictionInstrClassWrongM, .RASPredPCWrongM, .PredictionInstrClassWrongM,
.InstrClassM, .DCacheMiss, .DCacheAccess, .ICacheMiss, .ICacheAccess, .PrivilegedM, .InstrClassM, .JumpOrTakenBranchM, .DCacheMiss, .DCacheAccess, .ICacheMiss, .ICacheAccess, .PrivilegedM,
.InstrPageFaultF, .LoadPageFaultM, .StoreAmoPageFaultM, .InstrPageFaultF, .LoadPageFaultM, .StoreAmoPageFaultM,
.InstrMisalignedFaultM, .IllegalIEUInstrFaultD, .InstrMisalignedFaultM, .IllegalIEUInstrFaultD,
.LoadMisalignedFaultM, .StoreAmoMisalignedFaultM, .LoadMisalignedFaultM, .StoreAmoMisalignedFaultM,