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[yul-phaser] Add RelativeProgramSize metric

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This commit is contained in:
Kamil Śliwak 2020-02-20 19:36:46 +01:00
parent 7edbbe4edd
commit 0e03839e62
3 changed files with 95 additions and 0 deletions
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52
test/yulPhaser/FitnessMetrics.cpp
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@ -26,6 +26,8 @@
#include <boost/test/unit_test.hpp>
#include <cmath>
using namespace std;
using namespace solidity::langutil;
using namespace solidity::util;
@ -121,6 +123,56 @@ BOOST_FIXTURE_TEST_CASE(evaluate_should_not_optimise_if_number_of_repetitions_is
BOOST_TEST(fitness != m_optimisedProgram.codeSize());
}
BOOST_AUTO_TEST_SUITE_END()
BOOST_AUTO_TEST_SUITE(RelativeProgramSizeTest)
BOOST_FIXTURE_TEST_CASE(evaluate_should_compute_the_size_ratio_between_optimised_program_and_original_program, ProgramBasedMetricFixture)
{
BOOST_TEST(RelativeProgramSize(m_program, 3).evaluate(m_chromosome) == round(1000.0 * m_optimisedProgram.codeSize() / m_program.codeSize()));
}
BOOST_FIXTURE_TEST_CASE(evaluate_should_repeat_the_optimisation_specified_number_of_times, ProgramBasedMetricFixture)
{
Program const& programOptimisedOnce = m_optimisedProgram;
Program programOptimisedTwice = optimisedProgram(programOptimisedOnce);
RelativeProgramSize metric(m_program, 3, 2);
size_t fitness = metric.evaluate(m_chromosome);
BOOST_TEST(fitness != 1000);
BOOST_TEST(fitness != RelativeProgramSize(programOptimisedTwice, 3, 1).evaluate(m_chromosome));
BOOST_TEST(fitness == round(1000.0 * programOptimisedTwice.codeSize() / m_program.codeSize()));
}
BOOST_FIXTURE_TEST_CASE(evaluate_should_return_one_if_number_of_repetitions_is_zero, ProgramBasedMetricFixture)
{
RelativeProgramSize metric(m_program, 3, 0);
BOOST_TEST(metric.evaluate(m_chromosome) == 1000);
}
BOOST_FIXTURE_TEST_CASE(evaluate_should_return_one_if_the_original_program_size_is_zero, ProgramBasedMetricFixture)
{
CharStream sourceStream = CharStream("{}", "");
Program program = get<Program>(Program::load(sourceStream));
RelativeProgramSize metric(program, 3);
BOOST_TEST(metric.evaluate(m_chromosome) == 1000);
BOOST_TEST(metric.evaluate(Chromosome("")) == 1000);
BOOST_TEST(metric.evaluate(Chromosome("afcxjLTLTDoO")) == 1000);
}
BOOST_FIXTURE_TEST_CASE(evaluate_should_multiply_the_result_by_scaling_factor, ProgramBasedMetricFixture)
{
double sizeRatio = static_cast<double>(m_optimisedProgram.codeSize()) / m_program.codeSize();
BOOST_TEST(RelativeProgramSize(m_program, 0).evaluate(m_chromosome) == round(1.0 * sizeRatio));
BOOST_TEST(RelativeProgramSize(m_program, 1).evaluate(m_chromosome) == round(10.0 * sizeRatio));
BOOST_TEST(RelativeProgramSize(m_program, 2).evaluate(m_chromosome) == round(100.0 * sizeRatio));
BOOST_TEST(RelativeProgramSize(m_program, 3).evaluate(m_chromosome) == round(1000.0 * sizeRatio));
BOOST_TEST(RelativeProgramSize(m_program, 4).evaluate(m_chromosome) == round(10000.0 * sizeRatio));
}
BOOST_AUTO_TEST_SUITE_END()
BOOST_AUTO_TEST_SUITE_END()
BOOST_AUTO_TEST_SUITE_END()

17
tools/yulPhaser/FitnessMetrics.cpp
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@ -17,6 +17,8 @@
#include <tools/yulPhaser/FitnessMetrics.h>
#include <cmath>
using namespace std;
using namespace solidity::phaser;
@ -33,3 +35,18 @@ size_t ProgramSize::evaluate(Chromosome const& _chromosome)
{
return optimisedProgram(_chromosome).codeSize();
}
size_t RelativeProgramSize::evaluate(Chromosome const& _chromosome)
{
size_t const scalingFactor = pow(10, m_fixedPointPrecision);
size_t unoptimisedSize = optimisedProgram(Chromosome("")).codeSize();
if (unoptimisedSize == 0)
return scalingFactor;
size_t optimisedSize = optimisedProgram(_chromosome).codeSize();
return static_cast<size_t>(round(
static_cast<double>(optimisedSize) / unoptimisedSize * scalingFactor
));
}

26
tools/yulPhaser/FitnessMetrics.h
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@ -87,4 +87,30 @@ public:
size_t evaluate(Chromosome const& _chromosome) override;
};
/**
* Fitness metric based on the size of a specific program after applying the optimisations from the
* chromosome to it in relation to the original, unoptimised program.
*
* Since metric values are integers, the class multiplies the ratio by 10^@a _fixedPointPrecision
* before rounding it.
*/
class RelativeProgramSize: public ProgramBasedMetric
{
public:
explicit RelativeProgramSize(
Program _program,
size_t _fixedPointPrecision,
size_t _repetitionCount = 1
):
ProgramBasedMetric(std::move(_program), _repetitionCount),
m_fixedPointPrecision(_fixedPointPrecision) {}
size_t fixedPointPrecision() const { return m_fixedPointPrecision; }
size_t evaluate(Chromosome const& _chromosome) override;
private:
size_t m_fixedPointPrecision;
};
}