diff --git a/clang/include/clang/Basic/Builtins.def b/clang/include/clang/Basic/Builtins.def
--- a/clang/include/clang/Basic/Builtins.def
+++ b/clang/include/clang/Basic/Builtins.def
@@ -659,8 +659,10 @@
 BUILTIN(__builtin_elementwise_max, "v.", "nct")
 BUILTIN(__builtin_elementwise_min, "v.", "nct")
 BUILTIN(__builtin_elementwise_ceil, "v.", "nct")
+BUILTIN(__builtin_elementwise_cos, "v.", "nct")
 BUILTIN(__builtin_elementwise_floor, "v.", "nct")
 BUILTIN(__builtin_elementwise_roundeven, "v.", "nct")
+BUILTIN(__builtin_elementwise_sin, "v.", "nct")
 BUILTIN(__builtin_elementwise_trunc, "v.", "nct")
 BUILTIN(__builtin_elementwise_add_sat, "v.", "nct")
 BUILTIN(__builtin_elementwise_sub_sat, "v.", "nct")
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -3055,12 +3055,19 @@
   case Builtin::BI__builtin_elementwise_ceil:
     return RValue::get(
         emitUnaryBuiltin(*this, E, llvm::Intrinsic::ceil, "elt.ceil"));
+  case Builtin::BI__builtin_elementwise_cos:
+    return RValue::get(
+        emitUnaryBuiltin(*this, E, llvm::Intrinsic::cos, "elt.cos"));
   case Builtin::BI__builtin_elementwise_floor:
     return RValue::get(
         emitUnaryBuiltin(*this, E, llvm::Intrinsic::floor, "elt.floor"));
   case Builtin::BI__builtin_elementwise_roundeven:
     return RValue::get(emitUnaryBuiltin(*this, E, llvm::Intrinsic::roundeven,
                                         "elt.roundeven"));
+  case Builtin::BI__builtin_elementwise_sin:
+    return RValue::get(
+        emitUnaryBuiltin(*this, E, llvm::Intrinsic::sin, "elt.sin"));
+  
   case Builtin::BI__builtin_elementwise_trunc:
     return RValue::get(
         emitUnaryBuiltin(*this, E, llvm::Intrinsic::trunc, "elt.trunc"));
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -2571,8 +2571,10 @@
   // These builtins restrict the element type to floating point
   // types only.
   case Builtin::BI__builtin_elementwise_ceil:
+  case Builtin::BI__builtin_elementwise_cos:
   case Builtin::BI__builtin_elementwise_floor:
   case Builtin::BI__builtin_elementwise_roundeven:
+  case Builtin::BI__builtin_elementwise_sin:
   case Builtin::BI__builtin_elementwise_trunc: {
     if (PrepareBuiltinElementwiseMathOneArgCall(TheCall))
       return ExprError();
diff --git a/clang/test/CodeGen/builtins-elementwise-math.c b/clang/test/CodeGen/builtins-elementwise-math.c
--- a/clang/test/CodeGen/builtins-elementwise-math.c
+++ b/clang/test/CodeGen/builtins-elementwise-math.c
@@ -333,6 +333,22 @@
   vf2 = __builtin_elementwise_ceil(vf1);
 }
 
+void test_builtin_elementwise_cos(float f1, float f2, double d1, double d2,
+  float4 vf1, float4 vf2) {
+  // CHECK-LABEL: define void @test_builtin_elementwise_cos(
+  // CHECK:      [[F1:%.+]] = load float, float* %f1.addr, align 4
+  // CHECK-NEXT:  call float @llvm.cos.f32(float [[F1]])
+  f2 = __builtin_elementwise_cos(f1);
+
+  // CHECK:      [[D1:%.+]] = load double, double* %d1.addr, align 8
+  // CHECK-NEXT: call double @llvm.cos.f64(double [[D1]])
+  d2 = __builtin_elementwise_cos(d1);
+
+  // CHECK:      [[VF1:%.+]] = load <4 x float>, <4 x float>* %vf1.addr, align 16
+  // CHECK-NEXT: call <4 x float> @llvm.cos.v4f32(<4 x float> [[VF1]])
+  vf2 = __builtin_elementwise_cos(vf1);
+}
+
 void test_builtin_elementwise_floor(float f1, float f2, double d1, double d2,
                                     float4 vf1, float4 vf2) {
   // CHECK-LABEL: define void @test_builtin_elementwise_floor(
@@ -365,6 +381,22 @@
   vf2 = __builtin_elementwise_roundeven(vf1);
 }
 
+void test_builtin_elementwise_sin(float f1, float f2, double d1, double d2,
+  float4 vf1, float4 vf2) {
+  // CHECK-LABEL: define void @test_builtin_elementwise_sin(
+  // CHECK:      [[F1:%.+]] = load float, float* %f1.addr, align 4
+  // CHECK-NEXT:  call float @llvm.sin.f32(float [[F1]])
+  f2 = __builtin_elementwise_sin(f1);
+
+  // CHECK:      [[D1:%.+]] = load double, double* %d1.addr, align 8
+  // CHECK-NEXT: call double @llvm.sin.f64(double [[D1]])
+  d2 = __builtin_elementwise_sin(d1);
+
+  // CHECK:      [[VF1:%.+]] = load <4 x float>, <4 x float>* %vf1.addr, align 16
+  // CHECK-NEXT: call <4 x float> @llvm.sin.v4f32(<4 x float> [[VF1]])
+  vf2 = __builtin_elementwise_sin(vf1);
+}
+
 void test_builtin_elementwise_trunc(float f1, float f2, double d1, double d2,
                                     float4 vf1, float4 vf2) {
   // CHECK-LABEL: define void @test_builtin_elementwise_trunc(
diff --git a/clang/test/Sema/builtins-elementwise-math.c b/clang/test/Sema/builtins-elementwise-math.c
--- a/clang/test/Sema/builtins-elementwise-math.c
+++ b/clang/test/Sema/builtins-elementwise-math.c
@@ -280,6 +280,27 @@
   // expected-error@-1 {{1st argument must be a floating point type (was 'unsigned4' (vector of 4 'unsigned int' values))}}
 }
 
+void test_builtin_elementwise_cos(int i, float f, double d, float4 v, int3 iv, unsigned u, unsigned4 uv) {
+
+  struct Foo s = __builtin_elementwise_cos(f);
+  // expected-error@-1 {{initializing 'struct Foo' with an expression of incompatible type 'float'}}
+
+  i = __builtin_elementwise_cos();
+  // expected-error@-1 {{too few arguments to function call, expected 1, have 0}}
+
+  i = __builtin_elementwise_cos(i);
+  // expected-error@-1 {{1st argument must be a floating point type (was 'int')}}
+
+  i = __builtin_elementwise_cos(f, f);
+  // expected-error@-1 {{too many arguments to function call, expected 1, have 2}}
+
+  u = __builtin_elementwise_cos(u);
+  // expected-error@-1 {{1st argument must be a floating point type (was 'unsigned int')}}
+
+  uv = __builtin_elementwise_cos(uv);
+  // expected-error@-1 {{1st argument must be a floating point type (was 'unsigned4' (vector of 4 'unsigned int' values))}}
+}
+
 void test_builtin_elementwise_floor(int i, float f, double d, float4 v, int3 iv, unsigned u, unsigned4 uv) {
 
   struct Foo s = __builtin_elementwise_floor(f);
@@ -322,6 +343,27 @@
   // expected-error@-1 {{1st argument must be a floating point type (was 'unsigned4' (vector of 4 'unsigned int' values))}}
 }
 
+void test_builtin_elementwise_sin(int i, float f, double d, float4 v, int3 iv, unsigned u, unsigned4 uv) {
+
+  struct Foo s = __builtin_elementwise_sin(f);
+  // expected-error@-1 {{initializing 'struct Foo' with an expression of incompatible type 'float'}}
+
+  i = __builtin_elementwise_sin();
+  // expected-error@-1 {{too few arguments to function call, expected 1, have 0}}
+
+  i = __builtin_elementwise_sin(i);
+  // expected-error@-1 {{1st argument must be a floating point type (was 'int')}}
+
+  i = __builtin_elementwise_sin(f, f);
+  // expected-error@-1 {{too many arguments to function call, expected 1, have 2}}
+
+  u = __builtin_elementwise_sin(u);
+  // expected-error@-1 {{1st argument must be a floating point type (was 'unsigned int')}}
+
+  uv = __builtin_elementwise_sin(uv);
+  // expected-error@-1 {{1st argument must be a floating point type (was 'unsigned4' (vector of 4 'unsigned int' values))}}
+}
+
 void test_builtin_elementwise_trunc(int i, float f, double d, float4 v, int3 iv, unsigned u, unsigned4 uv) {
 
   struct Foo s = __builtin_elementwise_trunc(f);
diff --git a/clang/test/SemaCXX/builtins-elementwise-math.cpp b/clang/test/SemaCXX/builtins-elementwise-math.cpp
--- a/clang/test/SemaCXX/builtins-elementwise-math.cpp
+++ b/clang/test/SemaCXX/builtins-elementwise-math.cpp
@@ -59,3 +59,17 @@
   static_assert(!is_const<decltype(__builtin_elementwise_ceil(a))>::value);
   static_assert(!is_const<decltype(__builtin_elementwise_ceil(b))>::value);
 }
+
+void test_builtin_elementwise_cos() {
+  const float a = 42.0;
+  float b = 42.3;
+  static_assert(!is_const<decltype(__builtin_elementwise_cos(a))>::value);
+  static_assert(!is_const<decltype(__builtin_elementwise_cos(b))>::value);
+}
+
+void test_builtin_elementwise_sin() {
+  const float a = 42.0;
+  float b = 42.3;
+  static_assert(!is_const<decltype(__builtin_elementwise_sin(a))>::value);
+  static_assert(!is_const<decltype(__builtin_elementwise_sin(b))>::value);
+}
\ No newline at end of file