Index: lib/Sema/SemaExprMember.cpp
===================================================================
--- lib/Sema/SemaExprMember.cpp
+++ lib/Sema/SemaExprMember.cpp
@@ -384,7 +384,9 @@
     }
   }
 
-  if (!HalvingSwizzle) {
+  // OpenCL mode requires swizzle length to be in accordance with accepted
+  // sizes. Clang however supports arbitrary lengths for other languages.
+  if (S.getLangOpts().OpenCL && !HalvingSwizzle) {
     unsigned SwizzleLength = CompName->getLength();
 
     if (HexSwizzle)
Index: test/Sema/vector_swizzle_length.c
===================================================================
--- /dev/null
+++ test/Sema/vector_swizzle_length.c
@@ -0,0 +1,10 @@
+// RUN: %clang_cc1 -x c %s -verify -pedantic -fsyntax-only
+// expected-no-diagnostics
+
+typedef float float8 __attribute__((ext_vector_type(8)));
+
+void foo() {
+    float8 f2 = (float8){0, 0, 0, 0, 0, 0, 0, 0};
+    (void)f2.s01234;
+    (void)f2.xyzxy;
+}
Index: test/SemaOpenCL/vector_swizzle_length.cl
===================================================================
--- test/SemaOpenCL/vector_swizzle_length.cl
+++ test/SemaOpenCL/vector_swizzle_length.cl
@@ -1,9 +1,9 @@
-// RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only
+// RUN: %clang_cc1 -x cl %s -verify -pedantic -fsyntax-only
 
 typedef float float8 __attribute__((ext_vector_type(8)));
 
 void foo() {
-    float8 f2 = (float8)(0, 0, 0, 0, 0, 0, 0, 0);
+    float8 f2 = (float8){0, 0, 0, 0, 0, 0, 0, 0};
 
     f2.s01234; // expected-error {{vector component access has invalid length 5.  Supported: 1,2,3,4,8,16}}
     f2.xyzxy; // expected-error {{vector component access has invalid length 5.  Supported: 1,2,3,4,8,16}}