+/// \brief Invert the given condition
+Value *AMDGPUStructurizeCFG::invert(Value *Condition) {
+
+ // First: Check if it's a constant
+ if (Condition == BoolTrue)
+ return BoolFalse;
+
+ if (Condition == BoolFalse)
+ return BoolTrue;
+
+ if (Condition == BoolUndef)
+ return BoolUndef;
+
+ // Second: If the condition is already inverted, return the original value
+ if (match(Condition, m_Not(m_Value(Condition))))
+ return Condition;
+
+ // Third: Check all the users for an invert
+ BasicBlock *Parent = cast<Instruction>(Condition)->getParent();
+ for (Value::use_iterator I = Condition->use_begin(),
+ E = Condition->use_end(); I != E; ++I) {
+
+ Instruction *User = dyn_cast<Instruction>(*I);
+ if (!User || User->getParent() != Parent)
+ continue;
+
+ if (match(*I, m_Not(m_Specific(Condition))))
+ return *I;
+ }
+
+ // Last option: Create a new instruction
+ return BinaryOperator::CreateNot(Condition, "", Parent->getTerminator());
+}
+