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| author | Alex Beregszaszi <alex@rtfs.hu> | 2016-10-25 19:38:37 +0800 |
|---|---|---|
| committer | Alex Beregszaszi <alex@rtfs.hu> | 2016-11-30 19:16:43 +0800 |
| commit | 25160bfc26cd5ae4b5104625caba41c1533614ba (patch) | |
| tree | 931d52540abeefdb0f1a7ec7efce26cff9d13193 | |
| parent | f70f8cf06aea5dcd44b6256b040e05d2a3f7045d (diff) | |
| download | dexon-solidity-25160bfc26cd5ae4b5104625caba41c1533614ba.tar.gz dexon-solidity-25160bfc26cd5ae4b5104625caba41c1533614ba.tar.zst dexon-solidity-25160bfc26cd5ae4b5104625caba41c1533614ba.zip | |
Add optimiser rule for SUB with 0
| -rw-r--r-- | libevmasm/ExpressionClasses.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/libevmasm/ExpressionClasses.cpp b/libevmasm/ExpressionClasses.cpp index e32b2da2..cb327252 100644 --- a/libevmasm/ExpressionClasses.cpp +++ b/libevmasm/ExpressionClasses.cpp @@ -245,17 +245,18 @@ Rules::Rules() // invariants involving known constants {{Instruction::ADD, {X, 0}}, [=]{ return X; }}, + {{Instruction::SUB, {X, 0}}, [=]{ return X; }}, {{Instruction::MUL, {X, 1}}, [=]{ return X; }}, {{Instruction::DIV, {X, 1}}, [=]{ return X; }}, {{Instruction::SDIV, {X, 1}}, [=]{ return X; }}, {{Instruction::OR, {X, 0}}, [=]{ return X; }}, {{Instruction::XOR, {X, 0}}, [=]{ return X; }}, {{Instruction::AND, {X, ~u256(0)}}, [=]{ return X; }}, + {{Instruction::AND, {X, 0}}, [=]{ return u256(0); }}, {{Instruction::MUL, {X, 0}}, [=]{ return u256(0); }}, {{Instruction::DIV, {X, 0}}, [=]{ return u256(0); }}, {{Instruction::MOD, {X, 0}}, [=]{ return u256(0); }}, {{Instruction::MOD, {0, X}}, [=]{ return u256(0); }}, - {{Instruction::AND, {X, 0}}, [=]{ return u256(0); }}, {{Instruction::OR, {X, ~u256(0)}}, [=]{ return ~u256(0); }}, {{Instruction::EQ, {X, 0}}, [=]() -> Pattern { return {Instruction::ISZERO, {X}}; } }, // operations involving an expression and itself |