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Fix BTB entry aliasing with C extension

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This commit is contained in:
James Clarke
2019-11-02 20:38:35 +00:00
parent a0fd5a8f37
commit 78cad5bbcc
1 changed files with 3 additions and 2 deletions
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5
src_Core/RISCY_OOO/procs/lib/Btb.bsv
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@@ -39,9 +39,10 @@ interface NextAddrPred;
endinterface
// Local BTB Typedefs
typedef 1 PcLsbsIgnore;
typedef 256 BtbEntries; // 4KB BTB
typedef Bit#(TLog#(BtbEntries)) BtbIndex;
typedef Bit#(TSub#(TSub#(AddrSz, TLog#(BtbEntries)), 2)) BtbTag;
typedef Bit#(TSub#(TSub#(AddrSz, TLog#(BtbEntries)), PcLsbsIgnore)) BtbTag;
typedef struct {
Addr pc;
@@ -65,7 +66,7 @@ module mkBtb(NextAddrPred);
Bool flushDone = True;
`endif
function BtbIndex getIndex(Addr pc) = truncate(pc >> 2);
function BtbIndex getIndex(Addr pc) = truncate(pc >> valueof(PcLsbsIgnore));
function BtbTag getTag(Addr pc) = truncateLSB(pc);
// no flush, accept update