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sf/cmif: optimize dispatch table walk to use binary search over linear search

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This commit is contained in:
Michael Scire
2021-12-06 13:13:46 -08:00
parent 1019bc54e6
commit 09c6aa29dd
3 changed files with 110 additions and 22 deletions
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37
libraries/libstratosphere/include/stratosphere/sf/impl/sf_impl_autogen_interface_macros.hpp
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@@ -85,16 +85,41 @@ namespace ams::sf::impl {
constexpr const auto &BaseEntries = ::ams::sf::cmif::ServiceDispatchTraits<BASECLASS>::DispatchTable.GetEntries(); \
constexpr size_t BaseSize = BaseEntries.size(); \
\
std::array<::ams::sf::cmif::ServiceCommandMeta, BaseSize + CurSize> combined_entries{}; \
for (size_t i = 0; i < BaseSize; ++i) { \
combined_entries[i] = BaseEntries[i]; \
constexpr size_t CombinedSize = BaseSize + CurSize; \
\
std::array<size_t, CombinedSize> map{}; \
for (size_t i = 0; i < CombinedSize; ++i) { map[i] = i; } \
\
for (size_t i = 1; i < CombinedSize; ++i) { \
size_t j = i; \
while (j > 0) { \
const auto li = map[j]; \
const auto ri = map[j - 1]; \
\
const auto &lhs = (li < BaseSize) ? BaseEntries[li] : cur_entries[li - BaseSize]; \
const auto &rhs = (ri < BaseSize) ? BaseEntries[ri] : cur_entries[ri - BaseSize]; \
\
if (!(rhs > lhs)) { \
break; \
} \
\
std::swap(map[j], map[j - 1]); \
\
--j; \
} \
} \
for (size_t i = 0; i < CurSize; ++i) { \
combined_entries[BaseSize + i] = cur_entries[i]; \
\
std::array<::ams::sf::cmif::ServiceCommandMeta, CombinedSize> combined_entries{}; \
for (size_t i = 0; i < CombinedSize; ++i) { \
if (map[i] < BaseSize) { \
combined_entries[i] = BaseEntries[map[i]]; \
} else { \
combined_entries[i] = cur_entries[map[i] - BaseSize]; \
} \
} \
\
return ::ams::sf::cmif::ServiceDispatchTable { combined_entries }; \
} () \
}() \
}; \
};