diff options
Diffstat (limited to 'utils/TableGen/RegisterInfoEmitter.cpp')
| -rw-r--r-- | utils/TableGen/RegisterInfoEmitter.cpp | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/utils/TableGen/RegisterInfoEmitter.cpp b/utils/TableGen/RegisterInfoEmitter.cpp index dcc4b95..6853a0f 100644 --- a/utils/TableGen/RegisterInfoEmitter.cpp +++ b/utils/TableGen/RegisterInfoEmitter.cpp @@ -145,7 +145,6 @@ static void generateHashTable(raw_ostream &OS, const char *Name, HT.assign(HSize, Sentinel); // Insert all entries. - MaxProbes = 0; for (unsigned i = 0, e = Data.size(); i != e; ++i) { UUPair D = Data[i]; unsigned Idx = (D.first * 11 + D.second * 97) & (HSize - 1); @@ -155,10 +154,24 @@ static void generateHashTable(raw_ostream &OS, const char *Name, ProbeAmt += 1; } HT[Idx] = D; + } + + // Now measure the max number of probes for any worst case miss. + MaxProbes = 0; + unsigned TotalProbes = 0; + for (unsigned i = 0, e = HSize; i != e; ++i) { + unsigned Idx = i; + unsigned ProbeAmt = 1; + while (HT[Idx] != Sentinel) { + Idx = (Idx + ProbeAmt) & (HSize - 1); + ProbeAmt += 1; + } + TotalProbes += ProbeAmt; MaxProbes = std::max(MaxProbes, ProbeAmt); } - OS << "\n // Max number of probes: " << MaxProbes; - } while (MaxProbes >= 8); + OS << "\n // Max number of probes: " << MaxProbes + << format(", avg %.1f", float(TotalProbes)/HSize); + } while (MaxProbes >= 6); // Print the hash table. OS << "\n // Used entries: " << Data.size() |