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Remove unneccessary masking of tags.

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This commit is contained in:
chriseth 2020-07-08 20:13:11 +02:00
parent 76d3e579bc
commit d3abbd5610
2 changed files with 13 additions and 1 deletions
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1
Changelog.md
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@ -2,6 +2,7 @@
Compiler Features:
* Code Generator: Evaluate ``keccak256`` of string literals at compile-time.
* Peephole Optimizer: Remove unnecessary masking of tags.
Bugfixes:
* Type Checker: Fix overload resolution in combination with ``{value: ...}``.

13
libevmasm/PeepholeOptimiser.cpp
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@ -266,9 +266,10 @@ struct TagConjunctions: SimplePeepholeOptimizerMethod<TagConjunctions, 3>
std::back_insert_iterator<AssemblyItems> _out
)
{
if (_and != Instruction::AND)
return false;
if (
_pushTag.type() == PushTag &&
_and == Instruction::AND &&
_pushConstant.type() == Push &&
(_pushConstant.data() & u256(0xFFFFFFFF)) == u256(0xFFFFFFFF)
)
@ -276,6 +277,16 @@ struct TagConjunctions: SimplePeepholeOptimizerMethod<TagConjunctions, 3>
*_out = _pushTag;
return true;
}
else if (
// tag and constant are swapped
_pushConstant.type() == PushTag &&
_pushTag.type() == Push &&
(_pushTag.data() & u256(0xFFFFFFFF)) == u256(0xFFFFFFFF)
)
{
*_out = _pushConstant;
return true;
}
else
return false;
}