[clang][Interp] Support ImplicitValueInitExpr for complex types

Initialize both elements to 0, once again.

Author: tbaederr

clang/lib/AST/Interp/ByteCodeExprGen.cpp

@@ -820,6 +820,19 @@ bool ByteCodeExprGen<Emitter>::VisitImplicitValueInitExpr(const ImplicitValueIni
     return true;
   }
 
+  if (QT->isAnyComplexType()) {
+    assert(Initializing);
+    QualType ElemQT = QT->getAs<ComplexType>()->getElementType();
+    PrimType ElemT = classifyPrim(ElemQT);
+    for (unsigned I = 0; I < 2; ++I) {
+      if (!this->visitZeroInitializer(ElemT, ElemQT, E))
+        return false;
+      if (!this->emitInitElem(ElemT, I, E))
+        return false;
+    }
+    return true;
+  }
+
   return false;
 }
 

clang/test/AST/Interp/complex.cpp

@@ -102,6 +102,16 @@ static_assert(__imag(I3) == 0, "");
 // constexpr _Complex _BitInt(8) A = 0;// = {4};
 
 
+constexpr _Complex double Doubles[4] = {{1.0, 2.0}};
+static_assert(__real(Doubles[0]) == 1.0, "");
+static_assert(__imag(Doubles[0]) == 2.0, "");
+static_assert(__real(Doubles[1]) == 0.0, "");
+static_assert(__imag(Doubles[1]) == 0.0, "");
+static_assert(__real(Doubles[2]) == 0.0, "");
+static_assert(__imag(Doubles[2]) == 0.0, "");
+static_assert(__real(Doubles[3]) == 0.0, "");
+static_assert(__imag(Doubles[3]) == 0.0, "");
+
 void func(void) {
   __complex__ int arr;
   _Complex int result;