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Move AND with constant inside OR.

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chriseth
2021-03-09 15:26:19 +01:00
parent 1d95f95635
commit 40c27ccc22
7 changed files with 152 additions and 0 deletions
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libevmasm/RuleList.h
+17
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@@ -507,6 +507,23 @@ std::vector<SimplificationRule<Pattern>> simplificationRuleListPart7(
});
}
// Combine alternating AND/OR/AND with constant,
// AND(OR(AND(X, A), Y), B) -> OR(AND(X, A & B), AND(Y, B))
// Many versions due to commutativity.
for (auto const& inner: {Builtins::AND(X, A), Builtins::AND(A, X)})
for (auto const& second: {Builtins::OR(inner, Y), Builtins::OR(Y, inner)})
{
// We might swap X and Y but this is not an issue anymore.
rules.push_back({
Builtins::AND(second, B),
[=]() -> Pattern { return Builtins::OR(Builtins::AND(X, A.d() & B.d()), Builtins::AND(Y, B)); }
});
rules.push_back({
Builtins::AND(B, second),
[=]() -> Pattern { return Builtins::OR(Builtins::AND(X, A.d() & B.d()), Builtins::AND(Y, B)); }
});
}
rules.push_back({
// MUL(X, SHL(Y, 1)) -> SHL(Y, X)
Builtins::MUL(X, Builtins::SHL(Y, Word(1))),