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Coverage: improve efficiency of the counter propagation to the expansion regions.

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This patch reduces the complexity of the two inner loops in order to speed up 
the loading of coverage data for very large functions.

llvm-svn: 214228
This commit is contained in:
Alex Lorenz 2014-07-29 21:42:24 +00:00
parent 1d332e5199
commit 9503511918
1 changed files with 12 additions and 8 deletions
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20
lib/ProfileData/CoverageMappingReader.cpp
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@ -251,15 +251,19 @@ std::error_code RawCoverageMappingReader::read(CoverageMappingRecord &Record) {
// from the expanded file.
// Perform multiple passes to correctly propagate the counters through
// all the nested expansion regions.
SmallVector<CounterMappingRegion *, 8> FileIDExpansionRegionMapping;
FileIDExpansionRegionMapping.resize(VirtualFileMapping.size(), nullptr);
for (unsigned Pass = 1, S = VirtualFileMapping.size(); Pass < S; ++Pass) {
for (auto &I : MappingRegions) {
if (I.Kind == CounterMappingRegion::ExpansionRegion) {
for (const auto &J : MappingRegions) {
if (J.FileID == I.ExpandedFileID) {
I.Count = J.Count;
break;
}
}
for (auto &R : MappingRegions) {
if (R.Kind != CounterMappingRegion::ExpansionRegion)
continue;
assert(!FileIDExpansionRegionMapping[R.ExpandedFileID]);
FileIDExpansionRegionMapping[R.ExpandedFileID] = &R;
}
for (auto &R : MappingRegions) {
if (FileIDExpansionRegionMapping[R.FileID]) {
FileIDExpansionRegionMapping[R.FileID]->Count = R.Count;
FileIDExpansionRegionMapping[R.FileID] = nullptr;
}
}
}