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simplified simple stride slightly

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This commit is contained in:
Karlis Susters
2023-04-15 15:49:34 +03:00
parent 8e3d6409c0
commit cc65297cf9
1 changed files with 7 additions and 10 deletions
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17
src_Core/RISCY_OOO/coherence/src/Prefetcher.bsv
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@@ -1513,7 +1513,7 @@ endmodule
typedef struct {
Addr lastAddr;
Bit#(13) stride;
Int#(13) stride;
Bit#(2) confidence;
} SimpleStrideEntry deriving (Bits, Eq, FShow);
@@ -1530,14 +1530,14 @@ provisos(
Vector#(strideTableSize, Reg#(SimpleStrideEntry)) strideTable <- replicateM(mkReg(unpack(0)));
Reg#(Addr) addrToPrefetch <- mkReg(0);
Reg#(Bit#(13)) strideToPrefetch <- mkReg(0);
Reg#(Int#(13)) strideToPrefetch <- mkReg(0);
Ehr#(2, Bit#(3)) prefetchesIssued <- mkEhr(fromInteger(valueOf(cLinesAheadToPrefetch)));
method Action reportAccess(Addr addr, Bit#(16) pcHash, HitOrMiss hitMiss);
$display("%t report access %x %x", $time, addr, pcHash);
strideTableIndexT idx = truncate(pcHash);
SimpleStrideEntry entry = strideTable[idx];
Bit#(13) calc_stride = truncate(addr - entry.lastAddr);
Int#(13) calc_stride = unpack(truncate(addr - entry.lastAddr));
$display("found stride %x", entry.stride);
entry.lastAddr = addr;
if (calc_stride == entry.stride) begin
@@ -1566,18 +1566,15 @@ provisos(
method ActionValue#(Addr) getNextPrefetchAddr
if (prefetchesIssued[0] < fromInteger(valueOf(cLinesAheadToPrefetch)));
Bit#(13) strideToUse;
Bit#(13) cLineSize = fromInteger(valueof(DataSz));
Int#(13) strideToUse = strideToPrefetch;
Int#(13) cLineSize = fromInteger(valueof(DataSz));
if (abs(strideToPrefetch) < cLineSize) begin
strideToUse = (strideToPrefetch[12] == 1) ? -cLineSize : cLineSize;
end
else begin
strideToUse = strideToPrefetch;
strideToUse = (strideToPrefetch < 0) ? -cLineSize : cLineSize;
end
prefetchesIssued[0] <= prefetchesIssued[0] + 1;
let reqAddr = addrToPrefetch +
(signExtend(strideToUse) * zeroExtend(prefetchesIssued[0] + 1));
(pack(signExtend(strideToUse)) * zeroExtend(prefetchesIssued[0] + 1));
check(reqAddr[63:12] == addrToPrefetch[63:12]);
$display("%t getprefetchaddr ret %x", $time, reqAddr);