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Add more optimization rules

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Yoichi Hirai 2016-10-24 17:33:57 +02:00 committed by Alex Beregszaszi
parent 4ff89dda1d
commit df4b405f9c
1 changed files with 6 additions and 0 deletions
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6
libevmasm/ExpressionClasses.cpp
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@ -255,6 +255,7 @@ Rules::Rules()
{{Instruction::AND, {X, 0}}, [=]{ return u256(0); }},
{{Instruction::MUL, {X, 0}}, [=]{ return u256(0); }},
{{Instruction::DIV, {X, 0}}, [=]{ return u256(0); }},
{{Instruction::DIV, {0, X}}, [=]{ return u256(0); }},
{{Instruction::MOD, {X, 0}}, [=]{ return u256(0); }},
{{Instruction::MOD, {0, X}}, [=]{ return u256(0); }},
{{Instruction::OR, {X, ~u256(0)}}, [=]{ return ~u256(0); }},
@ -272,6 +273,11 @@ Rules::Rules()
{{Instruction::MOD, {X, X}}, [=]{ return u256(0); }},
{{Instruction::NOT, {{Instruction::NOT, {X}}}}, [=]{ return X; }},
{{Instruction::XOR, {{{X}, {Instruction::XOR, {X, Y}}}}}, [=]{ return Y; }},
{{Instruction::OR, {{{X}, {Instruction::AND, {X, Y}}}}}, [=]{ return X; }},
{{Instruction::AND, {{{X}, {Instruction::OR, {X, Y}}}}}, [=]{ return X; }},
{{Instruction::AND, {{{X}, {Instruction::NOT, {X}}}}}, [=]{ return u256(0); }},
{{Instruction::OR, {{{X}, {Instruction::NOT, {X}}}}}, [=]{ return ~u256(0); }},
};
// Double negation of opcodes with binary result
for (auto const& op: vector<Instruction>{