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Merge pull request #1864 from chriseth/sol_knowledgeEngine2

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Transfer knowledge about the state across jumps.
This commit is contained in:
chriseth 2015-05-12 16:17:31 +02:00
commit b6bd56bccd
1 changed files with 57 additions and 0 deletions
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57
libsolidity/SolidityOptimizer.cpp
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@ -251,6 +251,63 @@ BOOST_AUTO_TEST_CASE(function_calls)
compareVersions("f(uint256)", 36);
}
BOOST_AUTO_TEST_CASE(storage_write_in_loops)
{
char const* sourceCode = R"(
contract test {
uint d;
function f(uint a) returns (uint r) {
var x = d;
for (uint i = 1; i < a * a; i++) {
r = d;
d = i;
}
}
}
)";
compileBothVersions(sourceCode);
compareVersions("f(uint256)", 0);
compareVersions("f(uint256)", 10);
compareVersions("f(uint256)", 36);
}
BOOST_AUTO_TEST_CASE(retain_information_in_branches)
{
// This tests that the optimizer knows that we already have "z == sha3(y)" inside both branches.
char const* sourceCode = R"(
contract c {
bytes32 d;
uint a;
function f(uint x, bytes32 y) returns (uint r_a, bytes32 r_d) {
bytes32 z = sha3(y);
if (x > 8) {
z = sha3(y);
a = x;
} else {
z = sha3(y);
a = x;
}
r_a = a;
r_d = d;
}
}
)";
compileBothVersions(sourceCode);
compareVersions("f(uint256,bytes32)", 0, "abc");
compareVersions("f(uint256,bytes32)", 8, "def");
compareVersions("f(uint256,bytes32)", 10, "ghi");
m_optimize = true;
bytes optimizedBytecode = compileAndRun(sourceCode, 0, "c");
size_t numSHA3s = 0;
eth::eachInstruction(optimizedBytecode, [&](Instruction _instr, u256 const&) {
if (_instr == eth::Instruction::SHA3)
numSHA3s++;
});
BOOST_CHECK_EQUAL(1, numSHA3s);
}
BOOST_AUTO_TEST_CASE(cse_intermediate_swap)
{
eth::KnownState state;