blocks: Support capturing complex variable in block.

// rdar://10033896


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@139020 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGExprComplex.cpp

@@ -311,11 +311,7 @@ void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
 //===----------------------------------------------------------------------===//
 
 ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
-  CGF.ErrorUnsupported(E, "complex expression");
-  llvm::Type *EltTy =
-    CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
-  llvm::Value *U = llvm::UndefValue::get(EltTy);
-  return ComplexPairTy(U, U);
+  return EmitLoadOfLValue(E);
 }
 
 ComplexPairTy ComplexExprEmitter::

test/CodeGen/capture-complex-expr-block.c

@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 %s -emit-llvm -o - -fblocks -triple x86_64-apple-darwin10 | FileCheck %s
+// rdar://10033986
+
+int main ()
+{
+    _Complex double c;
+    ^() {
+      _Complex double z;
+      z = z + c;
+    };
+    return 0;
+}
+
+// CHECK: define internal void @__main_block_invoke_0
+// CHECK:  [[C1:%.*]] = alloca { double, double }, align 8
+// CHECK:  [[C1]].realp = getelementptr inbounds { double, double }* [[C1]], i32 0, i32 0
+// CHECK-NEXT:  [[C1]].real = load double* [[C1]].realp
+// CHECK-NEXT:  [[C1]].imagp = getelementptr inbounds { double, double }* [[C1]], i32 0, i32 1
+// CHECK-NEXT:  [[C1]].imag = load double* [[C1]].imagp