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several options for pcnextf on fence.i

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This commit is contained in:
Ross Thompson 2022-12-19 23:33:12 -06:00
parent d18ef45c18
commit 67e0b021ae
1 changed files with 7 additions and 1 deletions
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8
pipelined/src/ifu/bpred.sv
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@ -269,8 +269,14 @@ module bpred
mux2 #(`XLEN) pccorrectemux(.d0(PCLinkE), .d1(IEUAdrE), .s(PCSrcE), .y(PCCorrectE));
// If the fence/csrw was predicted as a taken branch then we select PCF, rather PCE.
// could also just use PCM+4
// could also just use PCM+4, which should be pclinke
mux2 #(`XLEN) pcmuxBPWrongInvalidateFlush(.d0(PCE), .d1(PCF), .s(BPPredWrongM), .y(NextValidPCE));
//logic [`XLEN-1:0] PCLinkM;
//flopenr #(`XLEN) PCPEReg(clk, reset, ~StallM, PCLinkE, PCLinkM);
//assign NextValidPCE = PCLinkM;
// of the three, the mux is the cheapest, but the least clear.
// this could move entirely into ifu with no relation to bp with the third.
//assign NextValidPCE = PCE;