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Fixed another bug with the speculative gshare with instruction class prediction.

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This commit is contained in:
Ross Thompson 2023-01-29 00:33:40 -06:00
parent f6aafd6bad
commit f93eaeef8e
2 changed files with 6 additions and 4 deletions
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6
pipelined/regression/wave.do
View File

@ -584,6 +584,8 @@ 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/BPPredWrongE
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/BPPredWrongM
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
@ -625,7 +627,7 @@ add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/Fl
add wave -noupdate /testbench/dut/core/ifu/bpred/bpred/Predictor/DirPredictor/OldGHRF
add wave -noupdate /testbench/dut/core/priv/priv/csr/counters/counters/HPMCOUNTER_REGW
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} {217131 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} {296884 ns} 0}
quietly wave cursor active 5
configure wave -namecolwidth 250
configure wave -valuecolwidth 194
@ -641,4 +643,4 @@ configure wave -griddelta 40
configure wave -timeline 0
configure wave -timelineunits ns
update
WaveRestoreZoom {135840 ns} {362253 ns}
WaveRestoreZoom {18545889 ns} {18546113 ns}

4
pipelined/src/ifu/brpred/speculativegshare.sv
View File

@ -112,7 +112,7 @@ module speculativegshare
// GHRF;
always_comb begin
if(FlushD) begin
if(FlushD | DirPredictionWrongE) begin
GHRNextF = GHRNextD[k-1:0];
end else if(BranchInstrF) GHRNextF = {DirPredictionF[1], GHRF[k-1:1]};
else GHRNextF = GHRF;
@ -124,7 +124,7 @@ module speculativegshare
// use with out instruction class prediction
//assign GHRNextD = FlushD ? GHRNextE[k-1:0] : GHRF[k-1:0];
// with instruction class prediction
assign GHRNextD = FlushD ? GHRNextE[k-1:0] :
assign GHRNextD = (FlushD | DirPredictionWrongE) ? GHRNextE[k-1:0] :
WrongPredInstrClassD[0] & BranchInstrD ? {DirPredictionD[1], GHRF[k-1:1]} : // shift right
WrongPredInstrClassD[0] & ~BranchInstrD ? {OldGHRF[k-2:0], GHRExtraF}: // shift left
GHRF[k-1:0];