[clang][Interp] Implement ~ operator for complex values

Author: tbaederr

clang/lib/AST/Interp/ByteCodeExprGen.cpp

@@ -3827,6 +3827,18 @@ bool ByteCodeExprGen<Emitter>::VisitComplexUnaryOperator(
     // we sometimes have to do the lvalue-to-rvalue conversion here manually.
     return this->emitArrayElemPop(classifyPrim(E->getType()), 1, E);
 
+  case UO_Not: // ~x
+    if (!this->visit(SubExpr))
+      return false;
+    // Negate the imaginary component.
+    if (!this->emitArrayElem(ElemT, 1, E))
+      return false;
+    if (!this->emitNeg(ElemT, E))
+      return false;
+    if (!this->emitInitElem(ElemT, 1, E))
+      return false;
+    return DiscardResult ? this->emitPopPtr(E) : true;
+
   default:
     return this->emitInvalid(E);
   }

clang/test/AST/Interp/complex.cpp

@@ -115,6 +115,8 @@ static_assert(__imag(Doubles[2]) == 0.0, "");
 static_assert(__real(Doubles[3]) == 0.0, "");
 static_assert(__imag(Doubles[3]) == 0.0, "");
 
+static_assert(~(0.5 + 1.5j) == (0.5 + -1.5j), "");
+
 void func(void) {
   __complex__ int arr;
   _Complex int result;