Cheri-research/Toooba
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Delay BTB update by a cycle for timing.

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This should not be a primary degredation of performance since the
redirection gets on seperately from this update which will only affect
future predictions.
This commit is contained in:
Jonathan Woodruff
2022-01-08 10:15:22 +00:00
parent b84562a027
commit e600fd7d38
1 changed files with 4 additions and 3 deletions
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7
src_Core/RISCY_OOO/procs/lib/Btb.bsv
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@@ -38,6 +38,7 @@
import Types::*;
import ProcTypes::*;
import ConfigReg::*;
import DReg::*;
import Map::*;
import Vector::*;
import CHERICC_Fat::*;
@@ -100,7 +101,7 @@ module mkBtbCore(NextAddrPred#(hashSz))
fullRecords <- replicateM(mkMapLossyBRAM);
Vector#(SupSizeX2, MapSplit#(HashedTag#(hashSz), BtbIndex, VnD#(CompressedTarget), BtbAssociativity))
compressedRecords <- replicateM(mkMapLossyBRAM);
RWire#(BtbUpdate) updateEn <- mkRWire;
Reg#(Maybe#(BtbUpdate)) updateEn <- mkDReg(Invalid);
function BtbAddr getBtbAddr(CapMem pc) = unpack(truncateLSB(getAddr(pc)));
function BtbBank getBank(CapMem pc) = getBtbAddr(pc).bank;
@@ -111,7 +112,7 @@ module mkBtbCore(NextAddrPred#(hashSz))
// no flush, accept update
(* fire_when_enabled, no_implicit_conditions *)
rule canonUpdate(updateEn.wget matches tagged Valid .upd);
rule canonUpdate(updateEn matches tagged Valid .upd);
let pc = upd.pc;
let nextPc = upd.nextPc;
let taken = upd.taken;
@@ -149,7 +150,7 @@ module mkBtbCore(NextAddrPred#(hashSz))
endmethod
method Action update(CapMem pc, CapMem nextPc, Bool taken);
updateEn.wset(BtbUpdate {pc: pc, nextPc: nextPc, taken: taken});
updateEn <= Valid(BtbUpdate {pc: pc, nextPc: nextPc, taken: taken});
endmethod
`ifdef SECURITY