diff --git a/test/libyul/YulOptimizerTest.cpp b/test/libyul/YulOptimizerTest.cpp
index 221f3414d..8b0561378 100644
--- a/test/libyul/YulOptimizerTest.cpp
+++ b/test/libyul/YulOptimizerTest.cpp
@@ -60,6 +60,7 @@
 #include <libyul/backends/evm/EVMDialect.h>
 #include <libyul/backends/evm/EVMMetrics.h>
 #include <libyul/backends/wasm/WordSizeTransform.h>
+#include <libyul/backends/wasm/WasmDialect.h>
 #include <libyul/AsmPrinter.h>
 #include <libyul/AsmParser.h>
 #include <libyul/AsmAnalysis.h>
@@ -98,12 +99,24 @@ YulOptimizerTest::YulOptimizerTest(string const& _filename)
 	file.exceptions(ios::badbit);
 
 	m_source = parseSourceAndSettings(file);
-	if (m_settings.count("yul"))
+	if (m_settings.count("dialect"))
 	{
-		m_yul = true;
-		m_validatedSettings["yul"] = "true";
-		m_settings.erase("yul");
+		auto dialectName = m_settings["dialect"];
+		if (dialectName == "yul")
+			m_dialect = &Dialect::yul();
+		else if (dialectName == "ewasm")
+			m_dialect = &WasmDialect::instance();
+		else if (dialectName == "evm")
+			m_dialect = &EVMDialect::strictAssemblyForEVMObjects(dev::test::Options::get().evmVersion());
+		else
+			BOOST_THROW_EXCEPTION(runtime_error("Invalid dialect " + dialectName));
+
+		m_validatedSettings["dialect"] = dialectName;
+		m_settings.erase("dialect");
 	}
+	else
+		m_dialect = &EVMDialect::strictAssemblyForEVMObjects(dev::test::Options::get().evmVersion());
+
 	if (m_settings.count("step"))
 	{
 		m_validatedSettings["step"] = m_settings["step"];
@@ -350,7 +363,7 @@ TestCase::TestResult YulOptimizerTest::run(ostream& _stream, string const& _line
 		return TestResult::FatalError;
 	}
 
-	m_obtainedResult = AsmPrinter{m_yul}(*m_ast) + "\n";
+	m_obtainedResult = AsmPrinter{m_dialect->flavour == AsmFlavour::Yul}(*m_ast) + "\n";
 
 	if (m_optimizerStep != m_validatedSettings["step"])
 	{
@@ -406,7 +419,7 @@ bool YulOptimizerTest::parse(ostream& _stream, string const& _linePrefix, bool c
 {
 	AssemblyStack stack(
 		dev::test::Options::get().evmVersion(),
-		m_yul ? AssemblyStack::Language::Yul : AssemblyStack::Language::StrictAssembly,
+		m_dialect->flavour == AsmFlavour::Yul ? AssemblyStack::Language::Yul : AssemblyStack::Language::StrictAssembly,
 		dev::solidity::OptimiserSettings::none()
 	);
 	if (!stack.parseAndAnalyze("", m_source) || !stack.errors().empty())
@@ -415,7 +428,6 @@ bool YulOptimizerTest::parse(ostream& _stream, string const& _linePrefix, bool c
 		printErrors(_stream, stack.errors());
 		return false;
 	}
-	m_dialect = m_yul ? &Dialect::yul() : &EVMDialect::strictAssemblyForEVMObjects(dev::test::Options::get().evmVersion());
 	m_ast = stack.parserResult()->code;
 	m_analysisInfo = stack.parserResult()->analysisInfo;
 	return true;
diff --git a/test/libyul/YulOptimizerTest.h b/test/libyul/YulOptimizerTest.h
index a9cc04ab1..d74e3fc16 100644
--- a/test/libyul/YulOptimizerTest.h
+++ b/test/libyul/YulOptimizerTest.h
@@ -71,7 +71,6 @@ private:
 	static void printErrors(std::ostream& _stream, langutil::ErrorList const& _errors);
 
 	std::string m_source;
-	bool m_yul = false;
 	std::string m_optimizerStep;
 	std::string m_expectation;
 
diff --git a/test/libyul/yulOptimizerTests/disambiguator/for_statement.yul b/test/libyul/yulOptimizerTests/disambiguator/for_statement.yul
index ae7c0e114..79b372972 100644
--- a/test/libyul/yulOptimizerTests/disambiguator/for_statement.yul
+++ b/test/libyul/yulOptimizerTests/disambiguator/for_statement.yul
@@ -8,7 +8,7 @@
 }
 // ====
 // step: disambiguator
-// yul: true
+// dialect: yul
 // ----
 // {
 //     { let a:u256, b:u256 }
diff --git a/test/libyul/yulOptimizerTests/disambiguator/funtion_call.yul b/test/libyul/yulOptimizerTests/disambiguator/funtion_call.yul
index b081ebe6f..fe54227d3 100644
--- a/test/libyul/yulOptimizerTests/disambiguator/funtion_call.yul
+++ b/test/libyul/yulOptimizerTests/disambiguator/funtion_call.yul
@@ -8,7 +8,7 @@
 }
 // ====
 // step: disambiguator
-// yul: true
+// dialect: yul
 // ----
 // {
 //     {
diff --git a/test/libyul/yulOptimizerTests/disambiguator/if_statement.yul b/test/libyul/yulOptimizerTests/disambiguator/if_statement.yul
index 5dd6ac3bf..2dee55ae7 100644
--- a/test/libyul/yulOptimizerTests/disambiguator/if_statement.yul
+++ b/test/libyul/yulOptimizerTests/disambiguator/if_statement.yul
@@ -7,7 +7,7 @@
 }
 // ====
 // step: disambiguator
-// yul: true
+// dialect: yul
 // ----
 // {
 //     { let a:u256, b:u256, c:u256 }
diff --git a/test/libyul/yulOptimizerTests/disambiguator/long_names.yul b/test/libyul/yulOptimizerTests/disambiguator/long_names.yul
index 2b9f3e522..b5db97637 100644
--- a/test/libyul/yulOptimizerTests/disambiguator/long_names.yul
+++ b/test/libyul/yulOptimizerTests/disambiguator/long_names.yul
@@ -1,7 +1,7 @@
 { { let aanteuhdaoneudbrgkjiuaothduiathudaoeuh:u256 } { let aanteuhdaoneudbrgkjiuaothduiathudaoeuh:u256 } }
 // ====
 // step: disambiguator
-// yul: true
+// dialect: yul
 // ----
 // {
 //     {
diff --git a/test/libyul/yulOptimizerTests/disambiguator/smoke_yul.yul b/test/libyul/yulOptimizerTests/disambiguator/smoke_yul.yul
index d0702de6f..2ed2b9ad1 100644
--- a/test/libyul/yulOptimizerTests/disambiguator/smoke_yul.yul
+++ b/test/libyul/yulOptimizerTests/disambiguator/smoke_yul.yul
@@ -1,6 +1,6 @@
 { }
 // ====
 // step: disambiguator
-// yul: true
+// dialect: yul
 // ----
 // { }
diff --git a/test/libyul/yulOptimizerTests/disambiguator/switch_statement.yul b/test/libyul/yulOptimizerTests/disambiguator/switch_statement.yul
index 497f4985c..647c78fda 100644
--- a/test/libyul/yulOptimizerTests/disambiguator/switch_statement.yul
+++ b/test/libyul/yulOptimizerTests/disambiguator/switch_statement.yul
@@ -9,7 +9,7 @@
 }
 // ====
 // step: disambiguator
-// yul: true
+// dialect: yul
 // ----
 // {
 //     { let a:u256, b:u256, c:u256 }
diff --git a/test/libyul/yulOptimizerTests/disambiguator/variables.yul b/test/libyul/yulOptimizerTests/disambiguator/variables.yul
index 2d3318702..319809706 100644
--- a/test/libyul/yulOptimizerTests/disambiguator/variables.yul
+++ b/test/libyul/yulOptimizerTests/disambiguator/variables.yul
@@ -1,7 +1,7 @@
 { { let a:u256 } { let a:u256 } }
 // ====
 // step: disambiguator
-// yul: true
+// dialect: yul
 // ----
 // {
 //     { let a:u256 }
diff --git a/test/libyul/yulOptimizerTests/disambiguator/variables_clash.yul b/test/libyul/yulOptimizerTests/disambiguator/variables_clash.yul
index 9501b8a1c..9474dfc86 100644
--- a/test/libyul/yulOptimizerTests/disambiguator/variables_clash.yul
+++ b/test/libyul/yulOptimizerTests/disambiguator/variables_clash.yul
@@ -1,7 +1,7 @@
 { { let a:u256 let a_1:u256 } { let a:u256 } }
 // ====
 // step: disambiguator
-// yul: true
+// dialect: yul
 // ----
 // {
 //     {
diff --git a/test/libyul/yulOptimizerTests/disambiguator/variables_inside_functions.yul b/test/libyul/yulOptimizerTests/disambiguator/variables_inside_functions.yul
index b160f032c..66d36e431 100644
--- a/test/libyul/yulOptimizerTests/disambiguator/variables_inside_functions.yul
+++ b/test/libyul/yulOptimizerTests/disambiguator/variables_inside_functions.yul
@@ -7,7 +7,7 @@
 }
 // ====
 // step: disambiguator
-// yul: true
+// dialect: yul
 // ----
 // {
 //     {
diff --git a/test/libyul/yulOptimizerTests/expressionInliner/simple.yul b/test/libyul/yulOptimizerTests/expressionInliner/simple.yul
index 4302da79f..c1a1c147e 100644
--- a/test/libyul/yulOptimizerTests/expressionInliner/simple.yul
+++ b/test/libyul/yulOptimizerTests/expressionInliner/simple.yul
@@ -4,7 +4,7 @@
 }
 // ====
 // step: expressionInliner
-// yul: true
+// dialect: yul
 // ----
 // {
 //     function f() -> x:u256
diff --git a/test/libyul/yulOptimizerTests/expressionInliner/with_args.yul b/test/libyul/yulOptimizerTests/expressionInliner/with_args.yul
index 2bdd8ffd8..8dd694aec 100644
--- a/test/libyul/yulOptimizerTests/expressionInliner/with_args.yul
+++ b/test/libyul/yulOptimizerTests/expressionInliner/with_args.yul
@@ -4,7 +4,7 @@
 }
 // ====
 // step: expressionInliner
-// yul: true
+// dialect: yul
 // ----
 // {
 //     function f(a:u256) -> x:u256
diff --git a/test/libyul/yulOptimizerTests/functionGrouper/empty_block.yul b/test/libyul/yulOptimizerTests/functionGrouper/empty_block.yul
index 51699b7a8..950118647 100644
--- a/test/libyul/yulOptimizerTests/functionGrouper/empty_block.yul
+++ b/test/libyul/yulOptimizerTests/functionGrouper/empty_block.yul
@@ -1,7 +1,7 @@
 { let a:u256 { } function f() -> x:bool { let b:u256 := 4:u256 {} for {} f() {} {} } }
 // ====
 // step: functionGrouper
-// yul: true
+// dialect: yul
 // ----
 // {
 //     {
diff --git a/test/libyul/yulOptimizerTests/functionGrouper/multi_fun_mixed.yul b/test/libyul/yulOptimizerTests/functionGrouper/multi_fun_mixed.yul
index 73af943aa..559452a98 100644
--- a/test/libyul/yulOptimizerTests/functionGrouper/multi_fun_mixed.yul
+++ b/test/libyul/yulOptimizerTests/functionGrouper/multi_fun_mixed.yul
@@ -6,7 +6,7 @@
 }
 // ====
 // step: functionGrouper
-// yul: true
+// dialect: yul
 // ----
 // {
 //     {
diff --git a/test/libyul/yulOptimizerTests/functionGrouper/nested_fun.yul b/test/libyul/yulOptimizerTests/functionGrouper/nested_fun.yul
index ac67a4461..14b28fbab 100644
--- a/test/libyul/yulOptimizerTests/functionGrouper/nested_fun.yul
+++ b/test/libyul/yulOptimizerTests/functionGrouper/nested_fun.yul
@@ -10,7 +10,7 @@
 }
 // ====
 // step: functionGrouper
-// yul: true
+// dialect: yul
 // ----
 // {
 //     { let a:u256 }
diff --git a/test/libyul/yulOptimizerTests/functionGrouper/single_fun.yul b/test/libyul/yulOptimizerTests/functionGrouper/single_fun.yul
index ec72697a7..94af92287 100644
--- a/test/libyul/yulOptimizerTests/functionGrouper/single_fun.yul
+++ b/test/libyul/yulOptimizerTests/functionGrouper/single_fun.yul
@@ -3,7 +3,7 @@
 }
 // ====
 // step: functionGrouper
-// yul: true
+// dialect: yul
 // ----
 // {
 //     { let a:u256 }
diff --git a/test/libyul/yulOptimizerTests/functionHoister/empty_block.yul b/test/libyul/yulOptimizerTests/functionHoister/empty_block.yul
index 4d3b90d45..4a7c0a7a2 100644
--- a/test/libyul/yulOptimizerTests/functionHoister/empty_block.yul
+++ b/test/libyul/yulOptimizerTests/functionHoister/empty_block.yul
@@ -9,7 +9,7 @@
 }
 // ====
 // step: functionHoister
-// yul: true
+// dialect: yul
 // ----
 // {
 //     let a:u256
diff --git a/test/libyul/yulOptimizerTests/functionHoister/multi_mixed.yul b/test/libyul/yulOptimizerTests/functionHoister/multi_mixed.yul
index 7d41d59e7..78e4b49ab 100644
--- a/test/libyul/yulOptimizerTests/functionHoister/multi_mixed.yul
+++ b/test/libyul/yulOptimizerTests/functionHoister/multi_mixed.yul
@@ -7,7 +7,7 @@
 }
 // ====
 // step: functionHoister
-// yul: true
+// dialect: yul
 // ----
 // {
 //     let a:u256
diff --git a/test/libyul/yulOptimizerTests/functionHoister/nested.yul b/test/libyul/yulOptimizerTests/functionHoister/nested.yul
index 50d962907..813598503 100644
--- a/test/libyul/yulOptimizerTests/functionHoister/nested.yul
+++ b/test/libyul/yulOptimizerTests/functionHoister/nested.yul
@@ -8,7 +8,7 @@
 }
 // ====
 // step: functionHoister
-// yul: true
+// dialect: yul
 // ----
 // {
 //     let a:u256
diff --git a/test/libyul/yulOptimizerTests/functionHoister/single.yul b/test/libyul/yulOptimizerTests/functionHoister/single.yul
index 70c3ecb3d..70ecfdb8e 100644
--- a/test/libyul/yulOptimizerTests/functionHoister/single.yul
+++ b/test/libyul/yulOptimizerTests/functionHoister/single.yul
@@ -4,7 +4,7 @@
 }
 // ====
 // step: functionHoister
-// yul: true
+// dialect: yul
 // ----
 // {
 //     let a:u256
diff --git a/test/libyul/yulOptimizerTests/mainFunction/empty_block.yul b/test/libyul/yulOptimizerTests/mainFunction/empty_block.yul
index efe904d89..09a04e1d3 100644
--- a/test/libyul/yulOptimizerTests/mainFunction/empty_block.yul
+++ b/test/libyul/yulOptimizerTests/mainFunction/empty_block.yul
@@ -9,7 +9,7 @@
 }
 // ====
 // step: mainFunction
-// yul: true
+// dialect: yul
 // ----
 // {
 //     function main()
diff --git a/test/libyul/yulOptimizerTests/mainFunction/multi_fun_mixed.yul b/test/libyul/yulOptimizerTests/mainFunction/multi_fun_mixed.yul
index 2f4de38b6..7aaab11e5 100644
--- a/test/libyul/yulOptimizerTests/mainFunction/multi_fun_mixed.yul
+++ b/test/libyul/yulOptimizerTests/mainFunction/multi_fun_mixed.yul
@@ -7,7 +7,7 @@
 }
 // ====
 // step: mainFunction
-// yul: true
+// dialect: yul
 // ----
 // {
 //     function main()
diff --git a/test/libyul/yulOptimizerTests/mainFunction/nested_fun.yul b/test/libyul/yulOptimizerTests/mainFunction/nested_fun.yul
index 2c9d120b3..61cb67233 100644
--- a/test/libyul/yulOptimizerTests/mainFunction/nested_fun.yul
+++ b/test/libyul/yulOptimizerTests/mainFunction/nested_fun.yul
@@ -8,7 +8,7 @@
 }
 // ====
 // step: mainFunction
-// yul: true
+// dialect: yul
 // ----
 // {
 //     function main()
diff --git a/test/libyul/yulOptimizerTests/mainFunction/sigle_fun.yul b/test/libyul/yulOptimizerTests/mainFunction/sigle_fun.yul
index c7de43441..63154e8c3 100644
--- a/test/libyul/yulOptimizerTests/mainFunction/sigle_fun.yul
+++ b/test/libyul/yulOptimizerTests/mainFunction/sigle_fun.yul
@@ -4,7 +4,7 @@
 }
 // ====
 // step: mainFunction
-// yul: true
+// dialect: yul
 // ----
 // {
 //     function main()
diff --git a/test/libyul/yulOptimizerTests/mainFunction/smoke.yul b/test/libyul/yulOptimizerTests/mainFunction/smoke.yul
index 3ae7cb5f7..54ad2d843 100644
--- a/test/libyul/yulOptimizerTests/mainFunction/smoke.yul
+++ b/test/libyul/yulOptimizerTests/mainFunction/smoke.yul
@@ -1,7 +1,7 @@
 {}
 // ====
 // step: mainFunction
-// yul: true
+// dialect: yul
 // ----
 // {
 //     function main()