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Fixes u256 overflow in logical shift optimization rule and adds tests.

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This commit is contained in:
Bhargava Shastry
2019-03-13 11:19:20 +01:00
committed by chriseth
parent 2f37cd0986
commit 515fa872c8
7 changed files with 80 additions and 5 deletions
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test/libevmasm/Optimiser.cpp
+30
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@@ -238,6 +238,36 @@ BOOST_AUTO_TEST_CASE(cse_associativity2)
checkCSE(input, {Instruction::DUP2, Instruction::DUP2, Instruction::ADD, u256(5), Instruction::ADD});
}
BOOST_AUTO_TEST_CASE(cse_double_shift_right_overflow)
{
if (dev::test::Options::get().evmVersion().hasBitwiseShifting())
{
AssemblyItems input{
Instruction::CALLVALUE,
u256(2),
Instruction::SHR,
u256(-1),
Instruction::SHR
};
checkCSE(input, {u256(0)});
}
}
BOOST_AUTO_TEST_CASE(cse_double_shift_left_overflow)
{
if (dev::test::Options::get().evmVersion().hasBitwiseShifting())
{
AssemblyItems input{
Instruction::DUP1,
u256(2),
Instruction::SHL,
u256(-1),
Instruction::SHL
};
checkCSE(input, {u256(0)});
}
}
BOOST_AUTO_TEST_CASE(cse_storage)
{
AssemblyItems input{