From 188b3b2bf686aada8772475aabf899a0420cbd0f Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 20 Apr 2021 18:14:20 +0300
Subject: [PATCH] Make ConstantFolder check the type of the value directly

---
 source/glsl/optimize.cpp | 66 ++++++++++++++++------------------------
 source/glsl/optimize.h   |  1 -
 2 files changed, 26 insertions(+), 41 deletions(-)

diff --git a/source/glsl/optimize.cpp b/source/glsl/optimize.cpp
index bdaced5c..63dfcb5c 100644
--- a/source/glsl/optimize.cpp
+++ b/source/glsl/optimize.cpp
@@ -553,18 +553,6 @@ void ExpressionInliner::visit(Iteration &iter)
 }
 
 
-BasicTypeDeclaration::Kind ConstantFolder::get_value_kind(const Variant &value)
-{
-	if(value.check_type<bool>())
-		return BasicTypeDeclaration::BOOL;
-	else if(value.check_type<int>())
-		return BasicTypeDeclaration::INT;
-	else if(value.check_type<float>())
-		return BasicTypeDeclaration::FLOAT;
-	else
-		return BasicTypeDeclaration::VOID;
-}
-
 template<typename T>
 T ConstantFolder::evaluate_logical(char oper, T left, T right)
 {
@@ -623,20 +611,18 @@ void ConstantFolder::visit(RefPtr<Expression> &expr)
 	if(!r_constant || r_literal || r_uses_iter_var)
 		return;
 
-	BasicTypeDeclaration::Kind kind = get_value_kind(r_constant_value);
-	if(kind==BasicTypeDeclaration::VOID)
-	{
-		r_constant = false;
-		return;
-	}
-
 	RefPtr<Literal> literal = new Literal;
-	if(kind==BasicTypeDeclaration::BOOL)
+	if(r_constant_value.check_type<bool>())
 		literal->token = (r_constant_value.value<bool>() ? "true" : "false");
-	else if(kind==BasicTypeDeclaration::INT)
+	else if(r_constant_value.check_type<int>())
 		literal->token = lexical_cast<string>(r_constant_value.value<int>());
-	else if(kind==BasicTypeDeclaration::FLOAT)
+	else if(r_constant_value.check_type<float>())
 		literal->token = lexical_cast<string>(r_constant_value.value<float>());
+	else
+	{
+		r_constant = false;
+		return;
+	}
 	literal->value = r_constant_value;
 	expr = literal;
 }
@@ -678,25 +664,27 @@ void ConstantFolder::visit(UnaryExpression &unary)
 	if(!can_fold)
 		return;
 
-	BasicTypeDeclaration::Kind kind = get_value_kind(r_constant_value);
-
 	char oper = unary.oper->token[0];
 	char oper2 = unary.oper->token[1];
 	if(oper=='!')
 	{
-		if(kind==BasicTypeDeclaration::BOOL)
+		if(r_constant_value.check_type<bool>())
 			set_result(!r_constant_value.value<bool>());
 	}
 	else if(oper=='~')
 	{
-		if(kind==BasicTypeDeclaration::INT)
+		if(r_constant_value.check_type<int>())
 			set_result(~r_constant_value.value<int>());
+		else if(r_constant_value.check_type<unsigned>())
+			set_result(~r_constant_value.value<unsigned>());
 	}
 	else if(oper=='-' && !oper2)
 	{
-		if(kind==BasicTypeDeclaration::INT)
+		if(r_constant_value.check_type<int>())
 			set_result(-r_constant_value.value<int>());
-		else if(kind==BasicTypeDeclaration::FLOAT)
+		else if(r_constant_value.check_type<unsigned>())
+			set_result(-r_constant_value.value<unsigned>());
+		else if(r_constant_value.check_type<float>())
 			set_result(-r_constant_value.value<float>());
 	}
 }
@@ -716,45 +704,43 @@ void ConstantFolder::visit(BinaryExpression &binary)
 	if(!can_fold)
 		return;
 
-	BasicTypeDeclaration::Kind left_kind = get_value_kind(left_value);
-	BasicTypeDeclaration::Kind right_kind = get_value_kind(r_constant_value);
 	// Currently only expressions with both sides of equal types are handled.
-	if(left_kind!=right_kind)
+	if(!left_value.check_same_type(r_constant_value))
 		return;
 
 	char oper = binary.oper->token[0];
 	char oper2 = binary.oper->token[1];
 	if(oper=='&' || oper=='|' || oper=='^')
 	{
-		if(oper2==oper && left_kind==BasicTypeDeclaration::BOOL)
+		if(oper2==oper && left_value.check_type<bool>())
 			set_result(evaluate_logical(oper, left_value.value<bool>(), r_constant_value.value<bool>()));
-		else if(!oper2 && left_kind==BasicTypeDeclaration::INT)
+		else if(!oper2 && left_value.check_type<int>())
 			set_result(evaluate_logical(oper, left_value.value<int>(), r_constant_value.value<int>()));
 	}
 	else if((oper=='<' || oper=='>') && oper2!=oper)
 	{
-		if(left_kind==BasicTypeDeclaration::INT)
+		if(left_value.check_type<int>())
 			set_result(evaluate_relation(binary.oper->token, left_value.value<int>(), r_constant_value.value<int>()));
-		else if(left_kind==BasicTypeDeclaration::FLOAT)
+		else if(left_value.check_type<float>())
 			set_result(evaluate_relation(binary.oper->token, left_value.value<float>(), r_constant_value.value<float>()));
 	}
 	else if((oper=='=' || oper=='!') && oper2=='=')
 	{
-		if(left_kind==BasicTypeDeclaration::INT)
+		if(left_value.check_type<int>())
 			set_result((left_value.value<int>()==r_constant_value.value<int>()) == (oper=='='));
-		if(left_kind==BasicTypeDeclaration::FLOAT)
+		if(left_value.check_type<float>())
 			set_result((left_value.value<float>()==r_constant_value.value<float>()) == (oper=='='));
 	}
 	else if(oper=='+' || oper=='-' || oper=='*' || oper=='/')
 	{
-		if(left_kind==BasicTypeDeclaration::INT)
+		if(left_value.check_type<int>())
 			set_result(evaluate_arithmetic(oper, left_value.value<int>(), r_constant_value.value<int>()));
-		else if(left_kind==BasicTypeDeclaration::FLOAT)
+		else if(left_value.check_type<float>())
 			set_result(evaluate_arithmetic(oper, left_value.value<float>(), r_constant_value.value<float>()));
 	}
 	else if(oper=='%' || ((oper=='<' || oper=='>') && oper2==oper))
 	{
-		if(left_kind!=BasicTypeDeclaration::INT)
+		if(!left_value.check_type<int>())
 			return;
 
 		if(oper=='%')
diff --git a/source/glsl/optimize.h b/source/glsl/optimize.h
index ea61b671..a714a97a 100644
--- a/source/glsl/optimize.h
+++ b/source/glsl/optimize.h
@@ -175,7 +175,6 @@ public:
 	bool apply(Stage &s) { s.content.visit(*this); return r_any_folded; }
 
 private:
-	static BasicTypeDeclaration::Kind get_value_kind(const Variant &);
 	template<typename T>
 	static T evaluate_logical(char, T, T);
 	template<typename T>
-- 
2.43.0