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optimized branch predictor by removing unnecessary registers.

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This commit is contained in:
Ross Thompson 2023-01-29 22:39:37 -06:00
parent dd9d2be89c
commit 63267ff378
1 changed files with 6 additions and 6 deletions
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12
pipelined/src/ifu/bpred/speculativegshare.sv
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@ -128,15 +128,15 @@ module speculativegshare #(parameter int k = 10 ) (
flopenr #(k) GHRDReg(clk, reset, (~StallD) | FlushD, GHRNextD, GHRD); flopenr #(k) GHRDReg(clk, reset, (~StallD) | FlushD, GHRNextD, GHRD);
assign GHRNextE = BranchInstrE & ~FlushM ? {PCSrcE, GHRD[k-2:0]} : // if the branch is not flushed assign GHRNextE = BranchInstrE & ~FlushM ? {PCSrcE, GHRD[k-2:0]} : // if the branch is not flushed
FlushE ? GHRNextM : // branch is flushed FlushE ? GHRE : // branch is flushed
GHRD; GHRD;
flopenr #(k) GHREReg(clk, reset, (~StallE) | FlushE, GHRNextE, GHRE); flopenr #(k) GHREReg(clk, reset, (BranchInstrE & ~StallE) | FlushE, GHRNextE, GHRE);
assign GHRNextM = FlushM ? GHRNextW : GHRE; //assign GHRNextM = FlushM ? GHRM : GHRE;
flopenr #(k) GHRMReg(clk, reset, (~StallM) | FlushM, GHRNextM, GHRM); //flopenr #(k) GHRMReg(clk, reset, (BranchInstrM & ~StallM) | FlushM, GHRNextM, GHRM);
assign GHRNextW = FlushW ? GHRW : GHRM; //assign GHRNextW = FlushW ? GHRW : GHRM;
flopenr #(k) GHRWReg(clk, reset, (BranchInstrW & ~StallW) | FlushW, GHRNextW, GHRW); //flopenr #(k) GHRWReg(clk, reset, (BranchInstrW & ~StallW) | FlushW, GHRNextW, GHRW);
assign DirPredictionWrongE = PCSrcE != DirPredictionE[1] & BranchInstrE; assign DirPredictionWrongE = PCSrcE != DirPredictionE[1] & BranchInstrE;