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First simplify switch with known constant expression.

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This commit is contained in:
chriseth 2019-03-06 19:39:29 +01:00
parent 0f336f30ca
commit 791fde953d
6 changed files with 23 additions and 14 deletions
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5
libyul/optimiser/StructuralSimplifier.cpp
View File

@ -180,6 +180,9 @@ void StructuralSimplifier::simplify(std::vector<yul::Statement>& _statements)
return {};
},
[&](Switch& _switchStmt) -> OptionalStatements {
if (boost::optional<u256> const constExprVal = hasLiteralValue(*_switchStmt.expression))
return replaceConstArgSwitch(_switchStmt, constExprVal.get());
removeEmptyDefaultFromSwitch(_switchStmt);
removeEmptyCasesFromSwitch(_switchStmt);
@ -187,8 +190,6 @@ void StructuralSimplifier::simplify(std::vector<yul::Statement>& _statements)
return reduceNoCaseSwitch(_switchStmt);
else if (_switchStmt.cases.size() == 1)
return reduceSingleCaseSwitch(_switchStmt);
else if (boost::optional<u256> const constExprVal = hasLiteralValue(*_switchStmt.expression))
return replaceConstArgSwitch(_switchStmt, constExprVal.get());
return {};
},

4
test/libyul/yulOptimizerTests/structuralSimplifier/switch_remove_empty_all.yul
View File

@ -5,7 +5,7 @@
case 1 { }
default { }
switch 4
switch mload(4)
case 0 { }
case 1 { }
default { }
@ -15,5 +15,5 @@
// {
// let y := 200
// pop(add(y, 4))
// pop(4)
// pop(mload(4))
// }

10
test/libyul/yulOptimizerTests/structuralSimplifier/switch_remove_empty_case.yul
View File

@ -1,15 +1,19 @@
{
let y := 200
switch y
switch calldataload(0)
case 0 { }
case 1 { y := 9 }
case 2 { y := 10 }
}
// ----
// structuralSimplifier
// {
// let y := 200
// if eq(1, y)
// {
// switch calldataload(0)
// case 1 {
// y := 9
// }
// case 2 {
// y := 10
// }
// }

4
test/libyul/yulOptimizerTests/structuralSimplifier/switch_remove_empty_cases.yul
View File

@ -1,6 +1,6 @@
{
let y := 200
switch y
switch calldataload(0)
case 0 { }
case 1 { y := 9 }
default { }
@ -9,7 +9,7 @@
// structuralSimplifier
// {
// let y := 200
// if eq(1, y)
// if eq(1, calldataload(0))
// {
// y := 9
// }

10
test/libyul/yulOptimizerTests/structuralSimplifier/switch_remove_empty_default_case.yul
View File

@ -1,15 +1,19 @@
{
let y := 200
switch y
switch calldataload(0)
case 1 { y := 9 }
case 2 { y := 10 }
default { }
}
// ----
// structuralSimplifier
// {
// let y := 200
// if eq(1, y)
// {
// switch calldataload(0)
// case 1 {
// y := 9
// }
// case 2 {
// y := 10
// }
// }

4
test/libyul/yulOptimizerTests/structuralSimplifier/switch_to_if.yul
View File

@ -1,10 +1,10 @@
{
switch 1 case 2 { mstore(0, 0) }
switch calldataload(0) case 2 { mstore(0, 0) }
}
// ----
// structuralSimplifier
// {
// if eq(2, 1)
// if eq(2, calldataload(0))
// {
// mstore(0, 0)
// }