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[Fuzzer] Optimize UpdateFeatureFrequency #65288

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Merged
merged 1 commit into from
Sep 7, 2023
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[Fuzzer] Optimize UpdateFeatureFrequency #65288

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8 changes: 5 additions & 3 deletions compiler-rt/lib/fuzzer/FuzzerCorpus.h
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
#include "FuzzerSHA1.h"
#include "FuzzerTracePC.h"
#include <algorithm>
#include <bitset>
#include <chrono>
#include <numeric>
#include <random>
Expand Down Expand Up @@ -382,6 +383,7 @@ class InputCorpus {
}

// Remove most abundant rare feature.
IsRareFeature[Delete] = false;
RareFeatures[Delete] = RareFeatures.back();
RareFeatures.pop_back();

Expand All @@ -397,6 +399,7 @@ class InputCorpus {

// Add rare feature, handle collisions, and update energy.
RareFeatures.push_back(Idx);
IsRareFeature[Idx] = true;
GlobalFeatureFreqs[Idx] = 0;
for (auto II : Inputs) {
II->DeleteFeatureFreq(Idx);
Expand Down Expand Up @@ -450,9 +453,7 @@ class InputCorpus {
uint16_t Freq = GlobalFeatureFreqs[Idx32]++;

// Skip if abundant.
if (Freq > FreqOfMostAbundantRareFeature ||
std::find(RareFeatures.begin(), RareFeatures.end(), Idx32) ==
RareFeatures.end())
if (Freq > FreqOfMostAbundantRareFeature || !IsRareFeature[Idx32])
return;

// Update global frequencies.
Expand Down Expand Up @@ -581,6 +582,7 @@ class InputCorpus {
uint16_t FreqOfMostAbundantRareFeature = 0;
uint16_t GlobalFeatureFreqs[kFeatureSetSize] = {};
std::vector<uint32_t> RareFeatures;
std::bitset<kFeatureSetSize> IsRareFeature;

std::string OutputCorpus;
};
Expand Down