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run time improvements in computing the column multiplicity

This commit is contained in:
aletempiac 2023-11-23 16:29:33 +01:00
parent acdd08fd9b
commit 43f4dccb4f
1 changed files with 11 additions and 30 deletions
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41
src/acd/ac_decomposition.hpp
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@ -101,7 +101,7 @@ private:
};
private:
static constexpr uint32_t max_num_vars = 8;
static constexpr uint32_t max_num_vars = 10;
using STT = kitty::static_truth_table<max_num_vars>;
public:
@ -153,7 +153,7 @@ public:
[this]( STT const& tt ) { return column_multiplicity<2u>( tt ); },
[this]( STT const& tt ) { return column_multiplicity<3u>( tt ); },
[this]( STT const& tt ) { return column_multiplicity5<4u>( tt ); },
[this]( STT const& tt ) { return column_multiplicity5<5u>( tt ); } // slow, do not use
[this]( STT const& tt ) { return column_multiplicity5<5u>( tt ); }
};
for ( uint32_t i = start; i <= ps.lut_size - 1 && i <= ps.max_free_set_vars; ++i )
@ -290,7 +290,7 @@ private:
{
uint64_t multiplicity_set[4] = { 0u, 0u, 0u, 0u };
uint32_t multiplicity = 0;
uint32_t num_blocks = ( num_vars > 6 ) ? ( 1u << ( num_vars - 6 ) ) : 1;
uint32_t const num_blocks = ( num_vars > 6 ) ? ( 1u << ( num_vars - 6 ) ) : 1;
uint64_t constexpr masks_bits[] = { 0x0, 0x3, 0xF, 0x3F };
uint64_t constexpr masks_idx[] = { 0x0, 0x0, 0x0, 0x3 };
@ -321,40 +321,16 @@ private:
return multiplicity;
}
template<uint32_t free_set_size>
uint32_t column_multiplicity4( STT tt )
{
unsigned char multiplicity_set[1 << 16] = { 0 };
uint32_t multiplicity = 0;
uint32_t num_blocks = ( num_vars > 6 ) ? ( 1u << ( num_vars - 6 ) ) : 1;
uint64_t constexpr masks[] = { 0x0, 0x3, 0xF, 0xFF, 0xFFFF };
static_assert( free_set_size <= 4 );
/* extract iset functions */
auto it = std::begin( tt );
for ( auto i = 0u; i < num_blocks; ++i )
{
for ( auto j = 0; j < ( 64 >> free_set_size ); ++j )
{
multiplicity += multiplicity_set[*it & masks[free_set_size]]++ == 0 ? 1 : 0;
*it >>= ( 1u << free_set_size );
}
++it;
}
return multiplicity;
}
template<uint32_t free_set_size>
uint32_t column_multiplicity5( STT tt )
{
uint32_t num_blocks = ( num_vars > 6 ) ? ( 1u << ( num_vars - 6 ) ) : 1;
uint32_t const num_blocks = ( num_vars > 6 ) ? ( 1u << ( num_vars - 6 ) ) : 1;
uint64_t constexpr masks[] = { 0x0, 0x3, 0xF, 0xFF, 0xFFFF, 0xFFFFFFFF };
static_assert( free_set_size == 5 || free_set_size == 4 );
uint32_t size = 0;
uint64_t prev = -1;
std::array<uint32_t, 64> multiplicity_set;
/* extract iset functions */
@ -363,7 +339,12 @@ private:
{
for ( auto j = 0; j < ( 64 >> free_set_size ); ++j )
{
multiplicity_set[size++] = static_cast<uint32_t>( *it & masks[free_set_size] );
uint32_t fs_fn = static_cast<uint32_t>( *it & masks[free_set_size] );
if ( fs_fn != prev )
{
multiplicity_set[size++] = fs_fn;
prev = fs_fn;
}
*it >>= ( 1u << free_set_size );
}
++it;