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Complete the GT/LT rules.

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chriseth
2019-03-13 12:01:23 +01:00
parent 2f37cd0986
commit 571f400a3e
2 changed files with 4 additions and 1 deletions
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libevmasm/RuleList.h
+3 -1
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@@ -146,10 +146,12 @@ std::vector<SimplificationRule<Pattern>> simplificationRuleListPart2(
{{Instruction::SHR, {0, X}}, [=]{ return X; }, false},
{{Instruction::SHL, {X, 0}}, [=]{ return u256(0); }, true},
{{Instruction::SHR, {X, 0}}, [=]{ return u256(0); }, true},
{{Instruction::LT, {X, 0}}, [=]{ return u256(0); }, true},
{{Instruction::GT, {X, 0}}, [=]() -> Pattern { return {Instruction::ISZERO, {{Instruction::ISZERO, {X}}}}; }, false},
{{Instruction::LT, {0, X}}, [=]() -> Pattern { return {Instruction::ISZERO, {{Instruction::ISZERO, {X}}}}; }, false},
{{Instruction::GT, {X, ~u256(0)}}, [=]{ return u256(0); }, true},
{{Instruction::LT, {~u256(0), X}}, [=]{ return u256(0); }, true},
{{Instruction::GT, {0, X}}, [=]{ return u256(0); }, true},
{{Instruction::LT, {X, 0}}, [=]{ return u256(0); }, true},
{{Instruction::AND, {{Instruction::BYTE, {X, Y}}, {u256(0xff)}}}, [=]() -> Pattern { return {Instruction::BYTE, {X, Y}}; }, false},
{{Instruction::BYTE, {X, 31}}, [=]() -> Pattern { return {Instruction::AND, {X, u256(0xff)}}; }, false}
};