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More btb cleanup.

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This commit is contained in:
Ross Thompson 2023-03-01 10:47:00 -06:00
parent 554e7d0973
commit 03a6679ba0
1 changed files with 1 additions and 6 deletions
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7
src/ifu/bpred/btb.sv
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@ -92,15 +92,11 @@ module btb #(parameter Depth = 10 ) (
assign {BTBIClassF, BTAF} = MatchX ? ForwardBTBPredictionF : {TableBTBPredF};
logic UpdateEn;
// An optimization may be using a PC relative address.
ram2p1r1wbe #(2**Depth, `XLEN+4) memory(
.clk, .ce1(~StallF | reset), .ra1(PCNextFIndex), .rd1(TableBTBPredF),
.ce2(~StallW & ~FlushW), .wa2(PCMIndex), .wd2({InstrClassM, IEUAdrM}), .we2(BTBWrongM), .bwe2('1));
assign UpdateEn = |InstrClassM | IClassWrongM;
flopenrc #(`XLEN) BTBD(clk, reset, FlushD, ~StallD, BTAF, BTAD);
// BTAE is not strickly necessary. However it is used by two parts of wally.
@ -108,8 +104,7 @@ module btb #(parameter Depth = 10 ) (
// 2. BTAWrongE is used by the performance counters to track when the BTB's BTA or instruction class is wrong.
flopenrc #(`XLEN) BTBTargetEReg(clk, reset, FlushE, ~StallE, BTAD, BTAE);
assign BTAWrongE = (BTAE != IEUAdrE) & (InstrClassE[0] | InstrClassE[1] & ~InstrClassE[2]);
//assign BTBWrongE = BTAWrongE | IClassWrongE;
//flopenrc #(1) BTBWrongMReg(clk, reset, FlushM, ~StallM, BTBWrongE, BTBWrongM);
flopenrc #(1) BTAWrongMReg(clk, reset, FlushM, ~StallM, BTAWrongE, BTAWrongM);
assign BTBWrongM = BTAWrongM | IClassWrongM;