Add OpUnreachable

include/sirit/sirit.h

@@ -292,6 +292,9 @@ public:
     /// Returns with no value from a function with void return type.
     void OpReturn();
 
+    /// Behavior is undefined if this instruction is executed.
+    void OpUnreachable();
+
     /// Return a value from a function.
     Id OpReturnValue(Id value);
 

src/instructions/flow.cpp

@@ -67,6 +67,11 @@ void Module::OpReturn() {
     *code << spv::Op::OpReturn << EndOp{};
 }
 
+void Module::OpUnreachable() {
+    code->Reserve(1);
+    *code << spv::Op::OpUnreachable << EndOp{};
+}
+
 Id Module::OpReturnValue(Id value) {
     code->Reserve(2);
     return *code << spv::Op::OpReturnValue << value << EndOp{};