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Remove useless SWAP1 in front of commutative operations

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This commit is contained in:
Alex Beregszaszi
2018-04-03 18:57:07 +02:00
parent 0edce4b570
commit 17bcabb6cf
3 changed files with 72 additions and 1 deletions
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test/libevmasm/Optimiser.cpp
+51
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@@ -858,6 +858,57 @@ BOOST_AUTO_TEST_CASE(peephole_pop_calldatasize)
BOOST_CHECK(items.empty());
}
BOOST_AUTO_TEST_CASE(peephole_commutative_swap1)
{
AssemblyItems items{
u256(1),
u256(2),
Instruction::SWAP1,
Instruction::ADD,
u256(4),
u256(5)
};
AssemblyItems expectation{
u256(1),
u256(2),
Instruction::ADD,
u256(4),
u256(5)
};
PeepholeOptimiser peepOpt(items);
BOOST_REQUIRE(peepOpt.optimise());
BOOST_CHECK_EQUAL_COLLECTIONS(
items.begin(), items.end(),
expectation.begin(), expectation.end()
);
}
BOOST_AUTO_TEST_CASE(peephole_noncommutative_swap1)
{
AssemblyItems items{
u256(1),
u256(2),
Instruction::SWAP1,
Instruction::SUB,
u256(4),
u256(5)
};
AssemblyItems expectation{
u256(1),
u256(2),
Instruction::SWAP1,
Instruction::SUB,
u256(4),
u256(5)
};
PeepholeOptimiser peepOpt(items);
BOOST_REQUIRE(!peepOpt.optimise());
BOOST_CHECK_EQUAL_COLLECTIONS(
items.begin(), items.end(),
expectation.begin(), expectation.end()
);
}
BOOST_AUTO_TEST_CASE(jumpdest_removal)
{
AssemblyItems items{