diff --git a/.run/spice.run.xml b/.run/spice.run.xml
index 13bbfd476..307ec2696 100644
--- a/.run/spice.run.xml
+++ b/.run/spice.run.xml
@@ -1,5 +1,5 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="spice" type="CMakeRunConfiguration" factoryName="Application" PROGRAM_PARAMS="build -d -O0 -ir ../../media/test-project/test.spice" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" PROJECT_NAME="Spice" TARGET_NAME="spice" CONFIG_NAME="Debug" RUN_TARGET_PROJECT_NAME="Spice" RUN_TARGET_NAME="spice">
+  <configuration default="false" name="spice" type="CMakeRunConfiguration" factoryName="Application" PROGRAM_PARAMS="run -d -O3 -ir ../../media/test-project/test.spice" REDIRECT_INPUT="false" ELEVATE="false" USE_EXTERNAL_CONSOLE="false" EMULATE_TERMINAL="false" PASS_PARENT_ENVS_2="true" PROJECT_NAME="Spice" TARGET_NAME="spice" CONFIG_NAME="Debug" RUN_TARGET_PROJECT_NAME="Spice" RUN_TARGET_NAME="spice">
     <envs>
       <env name="SPICE_STD_DIR" value="$PROJECT_DIR$/std" />
     </envs>
diff --git a/src/ast/ASTBuilder.cpp b/src/ast/ASTBuilder.cpp
index 2b9dfa2c6..43e7b390c 100644
--- a/src/ast/ASTBuilder.cpp
+++ b/src/ast/ASTBuilder.cpp
@@ -791,7 +791,7 @@ std::any ASTBuilder::visitCastExpr(SpiceParser::CastExprContext *ctx) {
   auto castExprNode = createNode<CastExprNode>(ctx);
 
   // Enrich
-  castExprNode->isCasted = ctx->LPAREN();
+  castExprNode->isCast = ctx->LPAREN();
 
   // Visit children
   visitChildren(ctx);
diff --git a/src/ast/ASTNodes.h b/src/ast/ASTNodes.h
index b62e6e212..ef01be3f3 100644
--- a/src/ast/ASTNodes.h
+++ b/src/ast/ASTNodes.h
@@ -1581,7 +1581,7 @@ class CastExprNode : public ASTNode {
   [[nodiscard]] CompileTimeValue getCompileTimeValue() const override;
 
   // Public members
-  bool isCasted = false;
+  bool isCast = false;
 };
 
 // ==================================================== PrefixUnaryExprNode ======================================================
diff --git a/src/irgenerator/GenExpressions.cpp b/src/irgenerator/GenExpressions.cpp
index 08dca1c04..44e0cd149 100644
--- a/src/irgenerator/GenExpressions.cpp
+++ b/src/irgenerator/GenExpressions.cpp
@@ -500,7 +500,7 @@ std::any IRGenerator::visitCastExpr(const CastExprNode *node) {
   diGenerator.setSourceLocation(node);
 
   // Check if only one operand is present -> loop through
-  if (!node->isCasted)
+  if (!node->isCast)
     return visit(node->prefixUnaryExpr());
 
   // It is a cast expression
diff --git a/src/irgenerator/GenValues.cpp b/src/irgenerator/GenValues.cpp
index bfed54d3c..d232c8f3d 100644
--- a/src/irgenerator/GenValues.cpp
+++ b/src/irgenerator/GenValues.cpp
@@ -136,10 +136,12 @@ std::any IRGenerator::visitFctCall(const FctCallNode *node) {
   if (node->hasArgs) {
     argValues.reserve(node->argLst()->args().size());
     const std::vector<AssignExprNode *> args = node->argLst()->args();
+    const std::vector<SymbolType> paramSTypes =
+        data.isFctPtrCall() ? firstFragEntry->getType().getBaseType().getFunctionParamTypes() : spiceFunc->getParamTypes();
+    assert(paramSTypes.size() == args.size());
     for (size_t i = 0; i < args.size(); i++) {
       AssignExprNode *argNode = args.at(i);
-      SymbolType expectedSTy = data.isFctPtrCall() ? firstFragEntry->getType().getBaseType().getFunctionParamTypes().at(i)
-                                                   : spiceFunc->paramList.at(i).type;
+      const SymbolType& expectedSTy = paramSTypes.at(i);
       const SymbolType &actualSTy = argNode->getEvaluatedSymbolType(manIdx);
 
       // If the arrays are both of size -1 or 0, they are both pointers and do not need to be cast implicitly
diff --git a/src/irgenerator/OpRuleConversionManager.cpp b/src/irgenerator/OpRuleConversionManager.cpp
index 9304fec92..02e54851b 100644
--- a/src/irgenerator/OpRuleConversionManager.cpp
+++ b/src/irgenerator/OpRuleConversionManager.cpp
@@ -1489,7 +1489,7 @@ LLVMExprResult OpRuleConversionManager::getPrefixBitwiseNotInst(const ASTNode *n
   case TY_INT:   // fallthrough
   case TY_SHORT: // fallthrough
   case TY_LONG:
-    return {.value = builder.CreateNeg(lhsV())};
+    return {.value = builder.CreateNot(lhsV())};
   default:
     break;
   }
diff --git a/src/typechecker/TypeChecker.cpp b/src/typechecker/TypeChecker.cpp
index 65bd13117..2a70be99a 100644
--- a/src/typechecker/TypeChecker.cpp
+++ b/src/typechecker/TypeChecker.cpp
@@ -1051,7 +1051,7 @@ std::any TypeChecker::visitMultiplicativeExpr(MultiplicativeExprNode *node) {
 
 std::any TypeChecker::visitCastExpr(CastExprNode *node) {
   // Check if cast is applied
-  if (!node->isCasted)
+  if (!node->isCast)
     return visit(node->prefixUnaryExpr());
 
   // Visit source type
diff --git a/std/io/cli-subcommand.spice b/std/io/cli-subcommand.spice
index 300ed3ed5..95d79f23d 100644
--- a/std/io/cli-subcommand.spice
+++ b/std/io/cli-subcommand.spice
@@ -63,7 +63,7 @@ public f<int> CliSubcommand.parse(unsigned int argc, string[] argv, int layer =
             return EXIT_CODE_SUCCESS;
         }
 
-        // Check for flags
+        // Check for options
         foreach const CliOption<bool>& boolOption : iterate(this.boolOptions) {
             if arg == boolOption.getName() {
                 bool value = true;
@@ -72,8 +72,6 @@ public f<int> CliSubcommand.parse(unsigned int argc, string[] argv, int layer =
                 continue 2; // Continue with next argument
             }
         }
-
-        // Check for other options
         foreach const CliOption<string>& stringOption : iterate(this.stringOptions) {
             if arg == stringOption.getName() {
                 // get the argument value
diff --git a/test/test-files/irgenerator/lambdas/success-function-lambda/ir-code.ll b/test/test-files/irgenerator/lambdas/success-function-lambda/ir-code.ll
index c03891984..5d7613af9 100644
--- a/test/test-files/irgenerator/lambdas/success-function-lambda/ir-code.ll
+++ b/test/test-files/irgenerator/lambdas/success-function-lambda/ir-code.ll
@@ -118,7 +118,7 @@ define private i16 @_Z15lambda.L13C49.018__rt_string.Strings(%struct.String %0,
   %7 = sext i16 %6 to i32
   %8 = call i32 (ptr, ...) @printf(ptr noundef @printf.str.3, ptr %5, i32 %7)
   %9 = load i16, ptr %b, align 2
-  %10 = sub i16 0, %9
+  %10 = xor i16 %9, -1
   store i16 %10, ptr %3, align 2
   ret i16 %10
 }