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Peephole optimizer for "iszero iszero <tag> jumpi".

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This commit is contained in:
chriseth
2019-03-07 15:52:02 +01:00
parent c753b6bce5
commit e0d1b2f5b3
9 changed files with 169 additions and 96 deletions
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test/libevmasm/Optimiser.cpp
+54 -21
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@@ -969,27 +969,60 @@ BOOST_AUTO_TEST_CASE(peephole_swap_comparison)
BOOST_AUTO_TEST_CASE(peephole_truthy_and)
{
AssemblyItems items{
AssemblyItem(Tag, 1),
Instruction::BALANCE,
u256(0),
Instruction::NOT,
Instruction::AND,
AssemblyItem(PushTag, 1),
Instruction::JUMPI
};
AssemblyItems expectation{
AssemblyItem(Tag, 1),
Instruction::BALANCE,
AssemblyItem(PushTag, 1),
Instruction::JUMPI
};
PeepholeOptimiser peepOpt(items);
BOOST_REQUIRE(peepOpt.optimise());
BOOST_CHECK_EQUAL_COLLECTIONS(
items.begin(), items.end(),
expectation.begin(), expectation.end()
);
AssemblyItems items{
AssemblyItem(Tag, 1),
Instruction::BALANCE,
u256(0),
Instruction::NOT,
Instruction::AND,
AssemblyItem(PushTag, 1),
Instruction::JUMPI
};
AssemblyItems expectation{
AssemblyItem(Tag, 1),
Instruction::BALANCE,
AssemblyItem(PushTag, 1),
Instruction::JUMPI
};
PeepholeOptimiser peepOpt(items);
BOOST_REQUIRE(peepOpt.optimise());
BOOST_CHECK_EQUAL_COLLECTIONS(
items.begin(), items.end(),
expectation.begin(), expectation.end()
);
}
BOOST_AUTO_TEST_CASE(peephole_iszero_iszero_jumpi)
{
AssemblyItems items{
AssemblyItem(Tag, 1),
u256(0),
Instruction::CALLDATALOAD,
Instruction::ISZERO,
Instruction::ISZERO,
AssemblyItem(PushTag, 1),
Instruction::JUMPI,
u256(0),
u256(0x20),
Instruction::RETURN
};
AssemblyItems expectation{
AssemblyItem(Tag, 1),
u256(0),
Instruction::CALLDATALOAD,
AssemblyItem(PushTag, 1),
Instruction::JUMPI,
u256(0),
u256(0x20),
Instruction::RETURN
};
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)