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Add optimizer rules for multiplication and division by left-shifted one.

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Daniel Kirchner
2019-05-14 16:20:45 +02:00
parent 74fbf5402d
commit a5427bc63a
2 changed files with 26 additions and 0 deletions
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libevmasm/RuleList.h
+25
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@@ -391,6 +391,31 @@ std::vector<SimplificationRule<Pattern>> simplificationRuleListPart7(
false
});
rules.push_back({
// MUL(X, SHL(Y, 1)) -> SHL(Y, X)
{Instruction::MUL, {X, {Instruction::SHL, {Y, u256(1)}}}},
[=]() -> Pattern {
return {Instruction::SHL, {Y, X}};
},
false
});
rules.push_back({
// MUL(SHL(X, 1), Y) -> SHL(X, Y)
{Instruction::MUL, {{Instruction::SHL, {X, u256(1)}}, Y}},
[=]() -> Pattern {
return {Instruction::SHL, {X, Y}};
},
false
});
rules.push_back({
// DIV(X, SHL(Y, 1)) -> SHR(Y, X)
{Instruction::DIV, {X, {Instruction::SHL, {Y, u256(1)}}}},
[=]() -> Pattern {
return {Instruction::SHR, {Y, X}};
},
false
});
std::function<bool()> feasibilityFunction = [=]() {
if (B.d() > 256)