cerc-io/solidity
16
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Merge pull request #6016 from ethereum/shift-optim

Browse Source 
Add more optimisation rules for shifts
This commit is contained in:
chriseth 2019-02-20 14:46:54 +01:00 committed by GitHub
commit e4ac27d9fe
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Changelog.md
View File

@ -6,6 +6,7 @@ Language Features:
Compiler Features:
* SMTChecker: Do not report underflow/overflow if they always revert. This removes false positives when using ``SafeMath``.
* Static Analyzer: Warn about expressions with custom types when they have no effect.
* Optimizer: Add rule for shifts with constants for Constantinople.
Bugfixes:

4
libevmasm/RuleList.h
View File

@ -140,6 +140,10 @@ std::vector<SimplificationRule<Pattern>> simplificationRuleListPart2(
{{Instruction::MOD, {0, X}}, [=]{ return u256(0); }, true},
{{Instruction::EQ, {X, 0}}, [=]() -> Pattern { return {Instruction::ISZERO, {X}}; }, false },
{{Instruction::EQ, {0, X}}, [=]() -> Pattern { return {Instruction::ISZERO, {X}}; }, false },
{{Instruction::SHL, {0, X}}, [=]{ return X; }, false},
{{Instruction::SHR, {0, X}}, [=]{ return X; }, false},
{{Instruction::SHL, {X, 0}}, [=]{ return u256(0); }, true},
{{Instruction::SHR, {X, 0}}, [=]{ return u256(0); }, true},
};
}