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Consolidate RangeDispatcher under Dispatcher's umbrella.

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This commit is contained in:
Thomas Harte 2023-06-12 15:52:10 -04:00
parent 77c67ab59d
commit 1aa953dd4d
1 changed files with 54 additions and 52 deletions
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106
ClockReceiver/Dispatcher.hpp
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@ -11,6 +11,14 @@
namespace Dispatcher {
/// Provides glue for a run of calls like:
///
/// SequencerT.perform<0>(...)
/// SequencerT.perform<1>(...)
/// SequencerT.perform<2>(...)
/// ...etc...
///
/// Allowing the caller to execute any subrange of the calls.
template <typename SequencerT>
struct Dispatcher {
@ -38,15 +46,15 @@ private:
//
// Sensible choices by the optimiser are assumed.
#define index(n) \
case n: \
if constexpr (n <= SequencerT::max) { \
if constexpr (n == SequencerT::max) return; \
if constexpr (n < SequencerT::max) { \
if(use_end && end == n) return; \
} \
target.template perform<n>(args...); \
} \
#define index(n) \
case n: \
if constexpr (n <= SequencerT::max) { \
if constexpr (n == SequencerT::max) return; \
if constexpr (n < SequencerT::max) { \
if(use_end && end == n) return; \
} \
target.template perform<n>(start, end, args...); \
} \
[[fallthrough]];
#define index2(n) index(n); index(n+1);
@ -82,49 +90,43 @@ private:
};
/// An optional target for a Dispatcher which uses a classifier to divide the input region into typed ranges, issuing calls to the target
/// only to begin and end each subrange, and for the number of cycles spent within.
template <typename ClassifierT, TargetT>
struct RangeDispatcher {
static constexpr int max = ClassifierT::max;
template <int n, typename... Args>
void perform(int begin, int end, Arg&&... args) {
constexpr auto region = ClassifierT::region(n);
const auto clipped_start = std::max(start, find_begin(n));
const auto clipped_end = std::min(end, find_end(n));
if constexpr (n == find_begin(n)) {
target.begin<region>(clipped_start);
}
target.advance<region>(clipped_end - clipped_start);
if constexpr (n + 1 == find_end(n)) {
target.end<region>(clipped_end);
}
}
private:
constexpr int find_begin(int n) {
const auto type = ClassifierT::region(n);
while(n && ClassifierT::region(n - 1) == type) --n;
return n;
}
constexpr int find_end(int n) {
const auto type = ClassifierT::region(n);
while(n < ClassifierT::max && ClassifierT::region(n) == type) ++n;
return n;
}
};
}
#endif /* Dispatcher_hpp */
/*
template <typename ClassifierT, int x> constexpr int lower_bound() {
if constexpr (!x || ClassifierT::template type<x>() != ClassifierT::template type<x-1>()) {
return x;
} else {
return lower_bound<ClassifierT, x - 1>();
}
}
template <typename ClassifierT, typename TargetT>
void range_dispatch(TargetT &destination, int start, int end) {
#define case(x) case x: \
if constexpr (x+1 == ClassifierT::max || ClassifierT::template type<x+1>() != ClassifierT::template type<x>()) { \
const auto range_begin = std::max(start, lower_bound<ClassifierT, x>()); \
const auto range_end = std::min(end, x + 1); \
\
if(range_begin == lower_bound<ClassifierT, x>()) {\
destination.template begin<ClassifierT::template type<x>()>(range_begin); \
}\
destination.template perform<ClassifierT::template type<x>()>(range_begin, range_end); \
if(range_end == x+1) {\
destination.template end<ClassifierT::template type<x>()>(range_begin); \
}\
if(x+1 >= end) { \
break; \
} \
} \
[[fallthrough]];
switch(start) {
case(0)
case(1)
case(2)
case(3)
case(4)
case(5)
}
#undef case
}
*/