Inline trivial shader functions that are only called once

I.e. functions that consist of a single return statement.

diff --git a/source/programcompiler.cpp b/source/programcompiler.cpp
index 7224df1efba672d4afb7ecb12923a0109ae9f6f6..0e749c9736588ddaa5192d74a70fb9719dc16f05 100644 (file)
--- a/source/programcompiler.cpp
+++ b/source/programcompiler.cpp
@@ -173,6 +173,9 @@ bool ProgramCompiler::optimize(Stage &stage)
 {
        apply<ConstantConditionEliminator>(stage);
 
+       set<FunctionDeclaration *> inlineable = apply<InlineableFunctionLocator>(stage);
+       apply<FunctionInliner>(stage, inlineable);
+
        set<Node *> unused = apply<UnusedVariableLocator>(stage);
        set<Node *> unused2 = apply<UnusedFunctionLocator>(stage);
        unused.insert(unused2.begin(), unused2.end());
@@ -957,6 +960,108 @@ void ProgramCompiler::DeclarationReorderer::visit(Block &block)
 }
 
 
+ProgramCompiler::InlineableFunctionLocator::InlineableFunctionLocator():
+       in_function(0)
+{ }
+
+void ProgramCompiler::InlineableFunctionLocator::visit(FunctionCall &call)
+{
+       FunctionDeclaration *def = call.declaration;
+       if(def && def->definition!=def)
+               def = def->definition;
+
+       if(def)
+       {
+               unsigned &count = refcounts[def];
+               ++count;
+               if(count>1 || def==in_function)
+                       inlineable.erase(def);
+       }
+
+       TraversingVisitor::visit(call);
+}
+
+void ProgramCompiler::InlineableFunctionLocator::visit(FunctionDeclaration &func)
+{
+       unsigned &count = refcounts[func.definition];
+       if(!count && func.parameters.empty())
+               inlineable.insert(func.definition);
+
+       SetForScope<FunctionDeclaration *> set(in_function, &func);
+       TraversingVisitor::visit(func);
+}
+
+
+ProgramCompiler::FunctionInliner::FunctionInliner():
+       extract_result(0)
+{ }
+
+ProgramCompiler::FunctionInliner::FunctionInliner(const set<FunctionDeclaration *> &in):
+       inlineable(in),
+       extract_result(0)
+{ }
+
+void ProgramCompiler::FunctionInliner::visit_and_inline(RefPtr<Expression> &ptr)
+{
+       inline_result = 0;
+       ptr->visit(*this);
+       if(inline_result)
+               ptr = inline_result;
+}
+
+void ProgramCompiler::FunctionInliner::visit(Block &block)
+{
+       if(extract_result)
+               --extract_result;
+
+       for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); ++i)
+       {
+               (*i)->visit(*this);
+               if(extract_result)
+                       --extract_result;
+       }
+}
+
+void ProgramCompiler::FunctionInliner::visit(UnaryExpression &unary)
+{
+       visit_and_inline(unary.expression);
+       inline_result = 0;
+}
+
+void ProgramCompiler::FunctionInliner::visit(BinaryExpression &binary)
+{
+       visit_and_inline(binary.left);
+       visit_and_inline(binary.right);
+       inline_result = 0;
+}
+
+void ProgramCompiler::FunctionInliner::visit(FunctionCall &call)
+{
+       for(vector<RefPtr<Expression> >::iterator i=call.arguments.begin(); i!=call.arguments.end(); ++i)
+               visit_and_inline(*i);
+
+       FunctionDeclaration *def = call.declaration;
+       if(def && def->definition!=def)
+               def = def->definition;
+
+       if(def && inlineable.count(def))
+       {
+               extract_result = 2;
+               def->visit(*this);
+       }
+       else
+               inline_result = 0;
+}
+
+void ProgramCompiler::FunctionInliner::visit(Return &ret)
+{
+       TraversingVisitor::visit(ret);
+
+       if(extract_result)
+               inline_result = ret.expression->clone();
+}
+
+
 ProgramCompiler::ExpressionEvaluator::ExpressionEvaluator():
        variable_values(0),
        result(0.0f),

diff --git a/source/programcompiler.h b/source/programcompiler.h
index 8c4034d4e906baae7812ee66ecc1b84abff39448..46c37930d6d4e948299f6ef43b637746dc3e4256 100644 (file)
--- a/source/programcompiler.h
+++ b/source/programcompiler.h
@@ -179,6 +179,38 @@ private:
                virtual void visit(ProgramSyntax::FunctionDeclaration &) { kind = FUNCTION; }
        };
 
+       struct InlineableFunctionLocator: Visitor
+       {
+               typedef std::set<ProgramSyntax::FunctionDeclaration *> ResultType;
+
+               std::map<ProgramSyntax::FunctionDeclaration *, unsigned> refcounts;
+               std::set<ProgramSyntax::FunctionDeclaration *> inlineable;
+               ProgramSyntax::FunctionDeclaration *in_function;
+
+               InlineableFunctionLocator();
+
+               const ResultType &get_result() const { return inlineable; }
+               virtual void visit(ProgramSyntax::FunctionCall &);
+               virtual void visit(ProgramSyntax::FunctionDeclaration &);
+       };
+
+       struct FunctionInliner: Visitor
+       {
+               std::set<ProgramSyntax::FunctionDeclaration *> inlineable;
+               unsigned extract_result;
+               RefPtr<ProgramSyntax::Expression> inline_result;
+
+               FunctionInliner();
+               FunctionInliner(const std::set<ProgramSyntax::FunctionDeclaration *> &);
+
+               void visit_and_inline(RefPtr<ProgramSyntax::Expression> &);
+               virtual void visit(ProgramSyntax::Block &);
+               virtual void visit(ProgramSyntax::UnaryExpression &);
+               virtual void visit(ProgramSyntax::BinaryExpression &);
+               virtual void visit(ProgramSyntax::FunctionCall &);
+               virtual void visit(ProgramSyntax::Return &);
+       };
+
        struct ExpressionEvaluator: ProgramSyntax::NodeVisitor
        {
                typedef std::map<ProgramSyntax::VariableDeclaration *, ProgramSyntax::Expression *> ValueMap;