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Optimize MLD one-to-many getNodeQueryLevel

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This commit is contained in:
Michael Krasnyk 2017-09-29 10:02:01 +02:00
parent 790b574114
commit e7be271c43
1 changed files with 17 additions and 14 deletions
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31
src/engine/routing_algorithms/many_to_many.cpp
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@ -143,24 +143,27 @@ inline LevelID getNodeQueryLevel(const MultiLevelPartition &partition,
const std::size_t phantom_index,
const std::vector<std::size_t> &phantom_indices)
{
auto level = [&partition, node](const SegmentID &source, const SegmentID &target) {
if (source.enabled && target.enabled)
return partition.GetQueryLevel(source.id, target.id, node);
return INVALID_LEVEL_ID;
auto min_level = [&partition, node](const PhantomNode &phantom_node) {
const auto &forward_segment = phantom_node.forward_segment_id;
const auto forward_level =
forward_segment.enabled ? partition.GetHighestDifferentLevel(node, forward_segment.id)
: INVALID_LEVEL_ID;
const auto &reverse_segment = phantom_node.reverse_segment_id;
const auto reverse_level =
reverse_segment.enabled ? partition.GetHighestDifferentLevel(node, reverse_segment.id)
: INVALID_LEVEL_ID;
return std::min(forward_level, reverse_level);
};
const auto &source_phantom = phantom_nodes[phantom_index];
auto result = INVALID_LEVEL_ID;
// Get minimum level over all phantoms of the highest different level with respect to node
// This is equivalent to min_{∀ source, target} partition.GetQueryLevel(source, node, target)
auto result = min_level(phantom_nodes[phantom_index]);
for (const auto &index : phantom_indices)
{
const auto &target_phantom = phantom_nodes[index];
auto min_level = std::min(
std::min(level(source_phantom.forward_segment_id, target_phantom.forward_segment_id),
level(source_phantom.forward_segment_id, target_phantom.reverse_segment_id)),
std::min(level(source_phantom.reverse_segment_id, target_phantom.forward_segment_id),
level(source_phantom.reverse_segment_id, target_phantom.reverse_segment_id)));
result = std::min(result, min_level);
result = std::min(result, min_level(phantom_nodes[index]));
}
return result;
}