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Tests for optimizing constants.

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chriseth 2017-03-03 16:17:00 +01:00
parent 6bfd894f46
commit 05dac99922
1 changed files with 62 additions and 0 deletions
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62
test/libsolidity/SolidityOptimizer.cpp
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@ -31,6 +31,7 @@
#include <boost/test/unit_test.hpp> #include <boost/test/unit_test.hpp>
#include <boost/lexical_cast.hpp> #include <boost/lexical_cast.hpp>
#include <chrono>
#include <string> #include <string>
#include <tuple> #include <tuple>
#include <memory> #include <memory>
@ -1234,6 +1235,67 @@ BOOST_AUTO_TEST_CASE(computing_constants)
) == optimizedBytecode.cend()); ) == optimizedBytecode.cend());
} }
BOOST_AUTO_TEST_CASE(constant_optimization_early_exit)
{
// This tests that the constant optimizer does not try to find the best representation
// indefinitely but instead stops after some number of iterations.
char const* sourceCode = R"(
pragma solidity ^0.4.0;
contract HexEncoding {
function hexEncodeTest(address addr) returns (bytes32 ret) {
uint x = uint(addr) / 2**32;
// Nibble interleave
x = x & 0x00000000000000000000000000000000ffffffffffffffffffffffffffffffff;
x = (x | (x * 2**64)) & 0x0000000000000000ffffffffffffffff0000000000000000ffffffffffffffff;
x = (x | (x * 2**32)) & 0x00000000ffffffff00000000ffffffff00000000ffffffff00000000ffffffff;
x = (x | (x * 2**16)) & 0x0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff;
x = (x | (x * 2** 8)) & 0x00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff;
x = (x | (x * 2** 4)) & 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f;
// Hex encode
uint h = (x & 0x0808080808080808080808080808080808080808080808080808080808080808) / 8;
uint i = (x & 0x0404040404040404040404040404040404040404040404040404040404040404) / 4;
uint j = (x & 0x0202020202020202020202020202020202020202020202020202020202020202) / 2;
x = x + (h & (i | j)) * 0x27 + 0x3030303030303030303030303030303030303030303030303030303030303030;
// Store and load next batch
assembly {
mstore(0, x)
}
x = uint(addr) * 2**96;
// Nibble interleave
x = x & 0x00000000000000000000000000000000ffffffffffffffffffffffffffffffff;
x = (x | (x * 2**64)) & 0x0000000000000000ffffffffffffffff0000000000000000ffffffffffffffff;
x = (x | (x * 2**32)) & 0x00000000ffffffff00000000ffffffff00000000ffffffff00000000ffffffff;
x = (x | (x * 2**16)) & 0x0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff0000ffff;
x = (x | (x * 2** 8)) & 0x00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff00ff;
x = (x | (x * 2** 4)) & 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f;
// Hex encode
h = (x & 0x0808080808080808080808080808080808080808080808080808080808080808) / 8;
i = (x & 0x0404040404040404040404040404040404040404040404040404040404040404) / 4;
j = (x & 0x0202020202020202020202020202020202020202020202020202020202020202) / 2;
x = x + (h & (i | j)) * 0x27 + 0x3030303030303030303030303030303030303030303030303030303030303030;
// Store and hash
assembly {
mstore(32, x)
ret := sha3(0, 40)
}
}
}
)";
auto start = std::chrono::steady_clock::now();
compileBothVersions(sourceCode);
double duration = std::chrono::duration<double>(std::chrono::steady_clock::now() - start).count();
BOOST_CHECK_MESSAGE(duration < 20, "Compilation of constants took longer than 20 seconds.");
compareVersions("hexEncodeTest(address)", u256(0x123456789));
}
BOOST_AUTO_TEST_CASE(inconsistency) BOOST_AUTO_TEST_CASE(inconsistency)
{ {
// This is a test of a bug in the optimizer. // This is a test of a bug in the optimizer.