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Merge pull request #3822 from ethereum/swap-comparison

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Replace comparison operators with opposites if preceded by SWAP1
This commit is contained in:
chriseth
2018-04-05 11:57:26 +02:00
committed by GitHub
parent c6adad9368 8dc9113e37
commit c6da5c1650
4 changed files with 110 additions and 6 deletions
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test/libsolidity/SolidityEndToEndTest.cpp
+44
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@@ -11097,6 +11097,50 @@ BOOST_AUTO_TEST_CASE(staticcall_for_view_and_pure)
}
}
BOOST_AUTO_TEST_CASE(swap_peephole_optimisation)
{
char const* sourceCode = R"(
contract C {
function lt(uint a, uint b) returns (bool c) {
assembly {
a
b
swap1
lt
=: c
}
}
function add(uint a, uint b) returns (uint c) {
assembly {
a
b
swap1
add
=: c
}
}
function div(uint a, uint b) returns (uint c) {
assembly {
a
b
swap1
div
=: c
}
}
}
)";
compileAndRun(sourceCode);
BOOST_CHECK(callContractFunction("lt(uint256,uint256)", u256(1), u256(2)) == encodeArgs(u256(1)));
BOOST_CHECK(callContractFunction("lt(uint256,uint256)", u256(2), u256(1)) == encodeArgs(u256(0)));
BOOST_CHECK(callContractFunction("add(uint256,uint256)", u256(1), u256(2)) == encodeArgs(u256(3)));
BOOST_CHECK(callContractFunction("add(uint256,uint256)", u256(100), u256(200)) == encodeArgs(u256(300)));
BOOST_CHECK(callContractFunction("div(uint256,uint256)", u256(2), u256(1)) == encodeArgs(u256(2)));
BOOST_CHECK(callContractFunction("div(uint256,uint256)", u256(200), u256(10)) == encodeArgs(u256(20)));
BOOST_CHECK(callContractFunction("div(uint256,uint256)", u256(1), u256(0)) == encodeArgs(u256(0)));
BOOST_CHECK(callContractFunction("div(uint256,uint256)", u256(0), u256(1)) == encodeArgs(u256(0)));
}
BOOST_AUTO_TEST_SUITE_END()
}