Index: lib/Headers/opencl-c.h
===================================================================
--- lib/Headers/opencl-c.h
+++ lib/Headers/opencl-c.h
@@ -14469,7 +14469,7 @@
 #if __OPENCL_C_VERSION__ >= CL_VERSION_1_2
 // OpenCL v1.2 s6.12.13, v2.0 s6.13.13 - printf
 
-int printf(__constant const char* st, ...) __attribute__((format(printf, 1, 2)));
+int printf(__constant const char* st, ...);
 #endif
 
 // OpenCL v1.1 s6.11.3, v1.2 s6.12.14, v2.0 s6.13.14 - Image Read and Write Functions
Index: lib/Sema/SemaExpr.cpp
===================================================================
--- lib/Sema/SemaExpr.cpp
+++ lib/Sema/SemaExpr.cpp
@@ -737,33 +737,20 @@
     return ExprError();
   E = Res.get();
 
-  QualType ScalarTy = Ty;
-  unsigned NumElts = 0;
-  if (const ExtVectorType *VecTy = Ty->getAs<ExtVectorType>()) {
-    NumElts = VecTy->getNumElements();
-    ScalarTy = VecTy->getElementType();
-  }
-
   // If this is a 'float'  or '__fp16' (CVR qualified or typedef)
   // promote to double.
   // Note that default argument promotion applies only to float (and
   // half/fp16); it does not apply to _Float16.
-  const BuiltinType *BTy = ScalarTy->getAs<BuiltinType>();
+  const BuiltinType *BTy = Ty->getAs<BuiltinType>();
   if (BTy && (BTy->getKind() == BuiltinType::Half ||
               BTy->getKind() == BuiltinType::Float)) {
     if (getLangOpts().OpenCL &&
         !getOpenCLOptions().isEnabled("cl_khr_fp64")) {
-      if (BTy->getKind() == BuiltinType::Half) {
-        QualType Ty = Context.FloatTy;
-        if (NumElts != 0)
-          Ty = Context.getExtVectorType(Ty, NumElts);
-        E = ImpCastExprToType(E, Ty, CK_FloatingCast).get();
-      }
+        if (BTy->getKind() == BuiltinType::Half) {
+            E = ImpCastExprToType(E, Context.FloatTy, CK_FloatingCast).get();
+        }
     } else {
-      QualType Ty = Context.DoubleTy;
-      if (NumElts != 0)
-        Ty = Context.getExtVectorType(Ty, NumElts);
-      E = ImpCastExprToType(E, Ty, CK_FloatingCast).get();
+      E = ImpCastExprToType(E, Context.DoubleTy, CK_FloatingCast).get();
     }
   }
 
Index: test/CodeGenOpenCL/printf.cl
===================================================================
--- test/CodeGenOpenCL/printf.cl
+++ test/CodeGenOpenCL/printf.cl
@@ -12,28 +12,26 @@
 
 
 // ALL-LABEL: @test_printf_float2(
-// FP64: %conv = fpext <2 x float> %0 to <2 x double>
-// FP64: %call = call spir_func i32 (i8 addrspace(2)*, ...) @printf(i8 addrspace(2)* getelementptr inbounds ([5 x i8], [5 x i8] addrspace(2)* @.str, i32 0, i32 0), <2 x double> %conv)
+// FP64: %call = call spir_func i32 (i8 addrspace(2)*, ...) @printf(i8 addrspace(2)* getelementptr inbounds ([7 x i8], [7 x i8] addrspace(2)* @.str, i32 0, i32 0), <2 x float> %0)
 
-// NOFP64:  call spir_func i32 (i8 addrspace(2)*, ...) @printf(i8 addrspace(2)* getelementptr inbounds ([5 x i8], [5 x i8] addrspace(2)* @.str, i32 0, i32 0), <2 x float> %0)
+
+// NOFP64:  call spir_func i32 (i8 addrspace(2)*, ...) @printf(i8 addrspace(2)* getelementptr inbounds ([7 x i8], [7 x i8] addrspace(2)* @.str, i32 0, i32 0), <2 x float> %0)
 kernel void test_printf_float2(float2 arg) {
-  printf("%v2f", arg);
+  printf("%v2hlf", arg);
 }
 
 // ALL-LABEL: @test_printf_half2(
-// FP64: %conv = fpext <2 x half> %0 to <2 x double>
-// FP64:  %call = call spir_func i32 (i8 addrspace(2)*, ...) @printf(i8 addrspace(2)* getelementptr inbounds ([5 x i8], [5 x i8] addrspace(2)* @.str, i32 0, i32 0), <2 x double> %conv) #2
+// FP64:  %call = call spir_func i32 (i8 addrspace(2)*, ...) @printf(i8 addrspace(2)* getelementptr inbounds ([6 x i8], [6 x i8] addrspace(2)* @.str.1, i32 0, i32 0), <2 x half> %0)
 
-// NOFP64: %conv = fpext <2 x half> %0 to <2 x float>
-// NOFP64:  %call = call spir_func i32 (i8 addrspace(2)*, ...) @printf(i8 addrspace(2)* getelementptr inbounds ([5 x i8], [5 x i8] addrspace(2)* @.str, i32 0, i32 0), <2 x float> %conv) #2
+// NOFP64:  %call = call spir_func i32 (i8 addrspace(2)*, ...) @printf(i8 addrspace(2)* getelementptr inbounds ([6 x i8], [6 x i8] addrspace(2)* @.str.1, i32 0, i32 0), <2 x half> %0)
 kernel void test_printf_half2(half2 arg) {
-  printf("%v2f", arg);
+  printf("%v2hf", arg);
 }
 
 #ifdef cl_khr_fp64
 // FP64-LABEL: @test_printf_double2(
-// FP64: call spir_func i32 (i8 addrspace(2)*, ...) @printf(i8 addrspace(2)* getelementptr inbounds ([5 x i8], [5 x i8] addrspace(2)* @.str, i32 0, i32 0), <2 x double> %0) #2
+// FP64: call spir_func i32 (i8 addrspace(2)*, ...) @printf(i8 addrspace(2)* getelementptr inbounds ([6 x i8], [6 x i8] addrspace(2)* @.str.2, i32 0, i32 0), <2 x double> %0)
 kernel void test_printf_double2(double2 arg) {
-  printf("%v2f", arg);
+  printf("%v2lf", arg);
 }
 #endif
Index: test/SemaOpenCL/printf-format-string-warnings.cl
===================================================================
--- test/SemaOpenCL/printf-format-string-warnings.cl
+++ test/SemaOpenCL/printf-format-string-warnings.cl
@@ -1,13 +1,14 @@
 // RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only -cl-std=CL2.0 -finclude-default-header
 
-// Make sure warnings are produced based on printf format strings.
+// FIXME: Make sure warnings are produced based on printf format strings.
 
+// expected-no-diagnostics
 
 kernel void format_string_warnings(__constant char* arg) {
 
-  printf("%d", arg); // expected-warning {{format specifies type 'int' but the argument has type '__constant char *'}}
+  printf("%d", arg);
 
-  printf("not enough arguments %d %d", 4); // expected-warning {{more '%' conversions than data arguments}}
+  printf("not enough arguments %d %d", 4);
 
-  printf("too many arguments", 4); // expected-warning {{data argument not used by format string}}
+  printf("too many arguments", 4);
 }
Index: test/SemaOpenCL/printf-format-strings.cl
===================================================================
--- test/SemaOpenCL/printf-format-strings.cl
+++ test/SemaOpenCL/printf-format-strings.cl
@@ -13,10 +13,10 @@
 kernel void format_v4f32(float4 arg)
 {
 #ifdef cl_khr_fp64
-    printf("%v4f\n", arg);
+    printf("%v4f\n", arg); // expected-warning{{format specifies type 'double __attribute__((ext_vector_type(4)))' but the argument has type 'float4' (vector of 4 'float' values)}}
 
     // Precision modifier
-    printf("%.2v4f\n", arg);
+    printf("%.2v4f\n", arg); // expected-warning{{format specifies type 'double __attribute__((ext_vector_type(4)))' but the argument has type 'float4' (vector of 4 'float' values)}}
 #else
     // FIXME: These should not warn, and the type should be expected to be float.
     printf("%v4f\n", arg);  // expected-warning {{double __attribute__((ext_vector_type(4)))' but the argument has type 'float4' (vector of 4 'float' values)}}