llvmbot wrote:

<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-ir

Author: Deric Cheung (Icohedron)

<details>
<summary>Changes</summary>

This PR relands #<!-- -->122992.

A reland was attempted before (#<!-- -->123853), but it [failed to pass the 
`sanitizer-aarch64-linux-bootstrap-hwasan` 
buildbot](https://github.com/llvm/llvm-project/pull/123853#issuecomment-2608389396).
 

An issue (#<!-- -->124045) was made to document the failure and to try to 
determine the cause.

Currently we do not have working local reproduction of the issue, so it is 
difficult to debug and test fixes.
Our current guess is that the hwasan check is somehow being aborted when an 
error is reported via  `report_fatal_error` in the test 
[`reflect-error.ll`](https://github.com/Icohedron/llvm-project/blob/4363cd2685ad5a1772c8a66796d644783bce0951/clang/test/SemaHLSL/BuiltIns/reflect-errors.hlsl).

To get this PR up and running, we are temporarily marking hwasan as unsupported 
in the `report_fatal_error.ll` test.



---

Patch is 30.04 KiB, truncated to 20.00 KiB below, full version: 
https://github.com/llvm/llvm-project/pull/125599.diff


13 Files Affected:

- (modified) clang/include/clang/Basic/BuiltinsSPIRV.td (+6) 
- (modified) clang/lib/CodeGen/CGBuiltin.cpp (+13) 
- (modified) clang/lib/Headers/hlsl/hlsl_detail.h (+16) 
- (modified) clang/lib/Headers/hlsl/hlsl_intrinsics.h (+43) 
- (modified) clang/lib/Sema/SemaSPIRV.cpp (+32) 
- (added) clang/test/CodeGenHLSL/builtins/reflect.hlsl (+177) 
- (added) clang/test/CodeGenSPIRV/Builtins/reflect.c (+32) 
- (added) clang/test/SemaHLSL/BuiltIns/reflect-errors.hlsl (+33) 
- (added) clang/test/SemaSPIRV/BuiltIns/reflect-errors.c (+23) 
- (modified) llvm/include/llvm/IR/IntrinsicsSPIRV.td (+1) 
- (modified) llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp (+12-4) 
- (added) llvm/test/CodeGen/SPIRV/hlsl-intrinsics/reflect.ll (+33) 
- (added) llvm/test/CodeGen/SPIRV/opencl/reflect-error.ll (+14) 


``````````diff
diff --git a/clang/include/clang/Basic/BuiltinsSPIRV.td 
b/clang/include/clang/Basic/BuiltinsSPIRV.td
index f72c555921dfe..34933e889ba31 100644
--- a/clang/include/clang/Basic/BuiltinsSPIRV.td
+++ b/clang/include/clang/Basic/BuiltinsSPIRV.td
@@ -19,3 +19,9 @@ def SPIRVLength : Builtin {
   let Attributes = [NoThrow, Const];
   let Prototype = "void(...)";
 }
+
+def SPIRVReflect : Builtin {
+  let Spellings = ["__builtin_spirv_reflect"];
+  let Attributes = [NoThrow, Const];
+  let Prototype = "void(...)";
+}
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 361e4c4bf2e2e..509784888b445 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -20790,6 +20790,19 @@ Value *CodeGenFunction::EmitSPIRVBuiltinExpr(unsigned 
BuiltinID,
         /*ReturnType=*/X->getType()->getScalarType(), Intrinsic::spv_length,
         ArrayRef<Value *>{X}, nullptr, "spv.length");
   }
+  case SPIRV::BI__builtin_spirv_reflect: {
+    Value *I = EmitScalarExpr(E->getArg(0));
+    Value *N = EmitScalarExpr(E->getArg(1));
+    assert(E->getArg(0)->getType()->hasFloatingRepresentation() &&
+           E->getArg(1)->getType()->hasFloatingRepresentation() &&
+           "Reflect operands must have a float representation");
+    assert(E->getArg(0)->getType()->isVectorType() &&
+           E->getArg(1)->getType()->isVectorType() &&
+           "Reflect operands must be a vector");
+    return Builder.CreateIntrinsic(
+        /*ReturnType=*/I->getType(), Intrinsic::spv_reflect,
+        ArrayRef<Value *>{I, N}, nullptr, "spv.reflect");
+  }
   }
   return nullptr;
 }
diff --git a/clang/lib/Headers/hlsl/hlsl_detail.h 
b/clang/lib/Headers/hlsl/hlsl_detail.h
index b2c8cc6c5c3db..0d568539cd66a 100644
--- a/clang/lib/Headers/hlsl/hlsl_detail.h
+++ b/clang/lib/Headers/hlsl/hlsl_detail.h
@@ -79,6 +79,22 @@ constexpr enable_if_t<is_same<float, T>::value || 
is_same<half, T>::value, T>
 distance_vec_impl(vector<T, N> X, vector<T, N> Y) {
   return length_vec_impl(X - Y);
 }
+
+template <typename T>
+constexpr enable_if_t<is_same<float, T>::value || is_same<half, T>::value, T>
+reflect_impl(T I, T N) {
+  return I - 2 * N * I * N;
+}
+
+template <typename T, int L>
+constexpr vector<T, L> reflect_vec_impl(vector<T, L> I, vector<T, L> N) {
+#if (__has_builtin(__builtin_spirv_reflect))
+  return __builtin_spirv_reflect(I, N);
+#else
+  return I - 2 * N * __builtin_hlsl_dot(I, N);
+#endif
+}
+
 } // namespace __detail
 } // namespace hlsl
 #endif //_HLSL_HLSL_DETAILS_H_
diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h 
b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index d1f5fdff8b600..4e416ffc0e1e3 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -2008,6 +2008,49 @@ double3 rcp(double3);
 _HLSL_BUILTIN_ALIAS(__builtin_hlsl_elementwise_rcp)
 double4 rcp(double4);
 
+//===----------------------------------------------------------------------===//
+// reflect builtin
+//===----------------------------------------------------------------------===//
+
+/// \fn T reflect(T I, T N)
+/// \brief Returns a reflection using an incident ray, \a I, and a surface
+/// normal, \a N.
+/// \param I The incident ray.
+/// \param N The surface normal.
+///
+/// The return value is a floating-point vector that represents the reflection
+/// of the incident ray, \a I, off a surface with the normal \a N.
+///
+/// This function calculates the reflection vector using the following formula:
+/// V = I - 2 * N * dot(I N) .
+///
+/// N must already be normalized in order to achieve the desired result.
+///
+/// The operands must all be a scalar or vector whose component type is
+/// floating-point.
+///
+/// Result type and the type of all operands must be the same type.
+
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
+const inline half reflect(half I, half N) {
+  return __detail::reflect_impl(I, N);
+}
+
+const inline float reflect(float I, float N) {
+  return __detail::reflect_impl(I, N);
+}
+
+template <int L>
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
+const inline vector<half, L> reflect(vector<half, L> I, vector<half, L> N) {
+  return __detail::reflect_vec_impl(I, N);
+}
+
+template <int L>
+const inline vector<float, L> reflect(vector<float, L> I, vector<float, L> N) {
+  return __detail::reflect_vec_impl(I, N);
+}
+
 
//===----------------------------------------------------------------------===//
 // rsqrt builtins
 
//===----------------------------------------------------------------------===//
diff --git a/clang/lib/Sema/SemaSPIRV.cpp b/clang/lib/Sema/SemaSPIRV.cpp
index dc49fc7907357..94534485e07c3 100644
--- a/clang/lib/Sema/SemaSPIRV.cpp
+++ b/clang/lib/Sema/SemaSPIRV.cpp
@@ -69,6 +69,38 @@ bool SemaSPIRV::CheckSPIRVBuiltinFunctionCall(unsigned 
BuiltinID,
     TheCall->setType(RetTy);
     break;
   }
+  case SPIRV::BI__builtin_spirv_reflect: {
+    if (SemaRef.checkArgCount(TheCall, 2))
+      return true;
+
+    ExprResult A = TheCall->getArg(0);
+    QualType ArgTyA = A.get()->getType();
+    auto *VTyA = ArgTyA->getAs<VectorType>();
+    if (VTyA == nullptr) {
+      SemaRef.Diag(A.get()->getBeginLoc(),
+                   diag::err_typecheck_convert_incompatible)
+          << ArgTyA
+          << SemaRef.Context.getVectorType(ArgTyA, 2, VectorKind::Generic) << 1
+          << 0 << 0;
+      return true;
+    }
+
+    ExprResult B = TheCall->getArg(1);
+    QualType ArgTyB = B.get()->getType();
+    auto *VTyB = ArgTyB->getAs<VectorType>();
+    if (VTyB == nullptr) {
+      SemaRef.Diag(A.get()->getBeginLoc(),
+                   diag::err_typecheck_convert_incompatible)
+          << ArgTyB
+          << SemaRef.Context.getVectorType(ArgTyB, 2, VectorKind::Generic) << 1
+          << 0 << 0;
+      return true;
+    }
+
+    QualType RetTy = ArgTyA;
+    TheCall->setType(RetTy);
+    break;
+  }
   }
   return false;
 }
diff --git a/clang/test/CodeGenHLSL/builtins/reflect.hlsl 
b/clang/test/CodeGenHLSL/builtins/reflect.hlsl
new file mode 100644
index 0000000000000..35ee059697c4b
--- /dev/null
+++ b/clang/test/CodeGenHLSL/builtins/reflect.hlsl
@@ -0,0 +1,177 @@
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py 
UTC_ARGS: --version 5
+// RUN: %clang_cc1 -finclude-default-header -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -fnative-half-type \
+// RUN:   -emit-llvm -O1 -o - | FileCheck %s
+// RUN: %clang_cc1 -finclude-default-header -triple \
+// RUN:   spirv-unknown-vulkan-compute %s -fnative-half-type \
+// RUN:   -emit-llvm -O1 -o - | FileCheck %s --check-prefix=SPVCHECK
+
+// CHECK-LABEL: define noundef nofpclass(nan inf) half 
@_Z17test_reflect_halfDhDh(
+// CHECK-SAME: half noundef nofpclass(nan inf) [[I:%.*]], half noundef 
nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    [[MUL_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn half 
[[I]], 0xH4000
+// CHECK-NEXT:    [[TMP0:%.*]] = fmul reassoc nnan ninf nsz arcp afn half 
[[N]], [[N]]
+// CHECK-NEXT:    [[MUL2_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn half 
[[TMP0]], [[MUL_I]]
+// CHECK-NEXT:    [[SUB_I:%.*]] = fsub reassoc nnan ninf nsz arcp afn half 
[[I]], [[MUL2_I]]
+// CHECK-NEXT:    ret half [[SUB_I]]
+//
+// SPVCHECK-LABEL: define spir_func noundef nofpclass(nan inf) half 
@_Z17test_reflect_halfDhDh(
+// SPVCHECK-SAME: half noundef nofpclass(nan inf) [[I:%.*]], half noundef 
nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0:[0-9]+]] {
+// SPVCHECK-NEXT:  [[ENTRY:.*:]]
+// SPVCHECK-NEXT:    [[MUL_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn half 
[[I]], 0xH4000
+// SPVCHECK-NEXT:    [[TMP0:%.*]] = fmul reassoc nnan ninf nsz arcp afn half 
[[N]], [[N]]
+// SPVCHECK-NEXT:    [[MUL2_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn half 
[[TMP0]], [[MUL_I]]
+// SPVCHECK-NEXT:    [[SUB_I:%.*]] = fsub reassoc nnan ninf nsz arcp afn half 
[[I]], [[MUL2_I]]
+// SPVCHECK-NEXT:    ret half [[SUB_I]]
+//
+half test_reflect_half(half I, half N) {
+    return reflect(I, N);
+}
+
+// CHECK-LABEL: define noundef nofpclass(nan inf) <2 x half> 
@_Z18test_reflect_half2Dv2_DhS_(
+// CHECK-SAME: <2 x half> noundef nofpclass(nan inf) [[I:%.*]], <2 x half> 
noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    [[HLSL_DOT_I:%.*]] = tail call reassoc nnan ninf nsz arcp 
afn half @llvm.dx.fdot.v2f16(<2 x half> [[I]], <2 x half> [[N]])
+// CHECK-NEXT:    [[DOTSCALAR:%.*]] = fmul reassoc nnan ninf nsz arcp afn half 
[[HLSL_DOT_I]], 0xH4000
+// CHECK-NEXT:    [[TMP0:%.*]] = insertelement <2 x half> poison, half 
[[DOTSCALAR]], i64 0
+// CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <2 x half> [[TMP0]], <2 x half> 
poison, <2 x i32> zeroinitializer
+// CHECK-NEXT:    [[MUL1_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn <2 x 
half> [[TMP1]], [[N]]
+// CHECK-NEXT:    [[SUB_I:%.*]] = fsub reassoc nnan ninf nsz arcp afn <2 x 
half> [[I]], [[MUL1_I]]
+// CHECK-NEXT:    ret <2 x half> [[SUB_I]]
+//
+// SPVCHECK-LABEL: define spir_func noundef nofpclass(nan inf) <2 x half> 
@_Z18test_reflect_half2Dv2_DhS_(
+// SPVCHECK-SAME: <2 x half> noundef nofpclass(nan inf) [[I:%.*]], <2 x half> 
noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// SPVCHECK-NEXT:  [[ENTRY:.*:]]
+// SPVCHECK-NEXT:    [[SPV_REFLECT_I:%.*]] = tail call reassoc nnan ninf nsz 
arcp afn noundef <2 x half> @llvm.spv.reflect.v2f16(<2 x half> [[I]], <2 x 
half> [[N]])
+// SPVCHECK-NEXT:    ret <2 x half> [[SPV_REFLECT_I]]
+//
+half2 test_reflect_half2(half2 I, half2 N) {
+    return reflect(I, N);
+}
+
+// CHECK-LABEL: define noundef nofpclass(nan inf) <3 x half> 
@_Z18test_reflect_half3Dv3_DhS_(
+// CHECK-SAME: <3 x half> noundef nofpclass(nan inf) [[I:%.*]], <3 x half> 
noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    [[HLSL_DOT_I:%.*]] = tail call reassoc nnan ninf nsz arcp 
afn half @llvm.dx.fdot.v3f16(<3 x half> [[I]], <3 x half> [[N]])
+// CHECK-NEXT:    [[DOTSCALAR:%.*]] = fmul reassoc nnan ninf nsz arcp afn half 
[[HLSL_DOT_I]], 0xH4000
+// CHECK-NEXT:    [[TMP0:%.*]] = insertelement <3 x half> poison, half 
[[DOTSCALAR]], i64 0
+// CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <3 x half> [[TMP0]], <3 x half> 
poison, <3 x i32> zeroinitializer
+// CHECK-NEXT:    [[MUL1_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn <3 x 
half> [[TMP1]], [[N]]
+// CHECK-NEXT:    [[SUB_I:%.*]] = fsub reassoc nnan ninf nsz arcp afn <3 x 
half> [[I]], [[MUL1_I]]
+// CHECK-NEXT:    ret <3 x half> [[SUB_I]]
+//
+// SPVCHECK-LABEL: define spir_func noundef nofpclass(nan inf) <3 x half> 
@_Z18test_reflect_half3Dv3_DhS_(
+// SPVCHECK-SAME: <3 x half> noundef nofpclass(nan inf) [[I:%.*]], <3 x half> 
noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// SPVCHECK-NEXT:  [[ENTRY:.*:]]
+// SPVCHECK-NEXT:    [[SPV_REFLECT_I:%.*]] = tail call reassoc nnan ninf nsz 
arcp afn noundef <3 x half> @llvm.spv.reflect.v3f16(<3 x half> [[I]], <3 x 
half> [[N]])
+// SPVCHECK-NEXT:    ret <3 x half> [[SPV_REFLECT_I]]
+//
+half3 test_reflect_half3(half3 I, half3 N) {
+    return reflect(I, N);
+}
+
+// CHECK-LABEL: define noundef nofpclass(nan inf) <4 x half> 
@_Z18test_reflect_half4Dv4_DhS_(
+// CHECK-SAME: <4 x half> noundef nofpclass(nan inf) [[I:%.*]], <4 x half> 
noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    [[HLSL_DOT_I:%.*]] = tail call reassoc nnan ninf nsz arcp 
afn half @llvm.dx.fdot.v4f16(<4 x half> [[I]], <4 x half> [[N]])
+// CHECK-NEXT:    [[DOTSCALAR:%.*]] = fmul reassoc nnan ninf nsz arcp afn half 
[[HLSL_DOT_I]], 0xH4000
+// CHECK-NEXT:    [[TMP0:%.*]] = insertelement <4 x half> poison, half 
[[DOTSCALAR]], i64 0
+// CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <4 x half> [[TMP0]], <4 x half> 
poison, <4 x i32> zeroinitializer
+// CHECK-NEXT:    [[MUL1_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn <4 x 
half> [[TMP1]], [[N]]
+// CHECK-NEXT:    [[SUB_I:%.*]] = fsub reassoc nnan ninf nsz arcp afn <4 x 
half> [[I]], [[MUL1_I]]
+// CHECK-NEXT:    ret <4 x half> [[SUB_I]]
+//
+// SPVCHECK-LABEL: define spir_func noundef nofpclass(nan inf) <4 x half> 
@_Z18test_reflect_half4Dv4_DhS_(
+// SPVCHECK-SAME: <4 x half> noundef nofpclass(nan inf) [[I:%.*]], <4 x half> 
noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// SPVCHECK-NEXT:  [[ENTRY:.*:]]
+// SPVCHECK-NEXT:    [[SPV_REFLECT_I:%.*]] = tail call reassoc nnan ninf nsz 
arcp afn noundef <4 x half> @llvm.spv.reflect.v4f16(<4 x half> [[I]], <4 x 
half> [[N]])
+// SPVCHECK-NEXT:    ret <4 x half> [[SPV_REFLECT_I]]
+//
+half4 test_reflect_half4(half4 I, half4 N) {
+    return reflect(I, N);
+}
+
+// CHECK-LABEL: define noundef nofpclass(nan inf) float 
@_Z18test_reflect_floatff(
+// CHECK-SAME: float noundef nofpclass(nan inf) [[I:%.*]], float noundef 
nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    [[MUL_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn float 
[[I]], 2.000000e+00
+// CHECK-NEXT:    [[TMP0:%.*]] = fmul reassoc nnan ninf nsz arcp afn float 
[[N]], [[N]]
+// CHECK-NEXT:    [[MUL2_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn float 
[[TMP0]], [[MUL_I]]
+// CHECK-NEXT:    [[SUB_I:%.*]] = fsub reassoc nnan ninf nsz arcp afn float 
[[I]], [[MUL2_I]]
+// CHECK-NEXT:    ret float [[SUB_I]]
+//
+// SPVCHECK-LABEL: define spir_func noundef nofpclass(nan inf) float 
@_Z18test_reflect_floatff(
+// SPVCHECK-SAME: float noundef nofpclass(nan inf) [[I:%.*]], float noundef 
nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// SPVCHECK-NEXT:  [[ENTRY:.*:]]
+// SPVCHECK-NEXT:    [[MUL_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn float 
[[I]], 2.000000e+00
+// SPVCHECK-NEXT:    [[TMP0:%.*]] = fmul reassoc nnan ninf nsz arcp afn float 
[[N]], [[N]]
+// SPVCHECK-NEXT:    [[MUL2_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn 
float [[TMP0]], [[MUL_I]]
+// SPVCHECK-NEXT:    [[SUB_I:%.*]] = fsub reassoc nnan ninf nsz arcp afn float 
[[I]], [[MUL2_I]]
+// SPVCHECK-NEXT:    ret float [[SUB_I]]
+//
+float test_reflect_float(float I, float N) {
+    return reflect(I, N);
+}
+
+// CHECK-LABEL: define noundef nofpclass(nan inf) <2 x float> 
@_Z19test_reflect_float2Dv2_fS_(
+// CHECK-SAME: <2 x float> noundef nofpclass(nan inf) [[I:%.*]], <2 x float> 
noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    [[HLSL_DOT_I:%.*]] = tail call reassoc nnan ninf nsz arcp 
afn float @llvm.dx.fdot.v2f32(<2 x float> [[I]], <2 x float> [[N]])
+// CHECK-NEXT:    [[DOTSCALAR:%.*]] = fmul reassoc nnan ninf nsz arcp afn 
float [[HLSL_DOT_I]], 2.000000e+00
+// CHECK-NEXT:    [[TMP0:%.*]] = insertelement <2 x float> poison, float 
[[DOTSCALAR]], i64 0
+// CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <2 x float> [[TMP0]], <2 x 
float> poison, <2 x i32> zeroinitializer
+// CHECK-NEXT:    [[MUL1_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn <2 x 
float> [[TMP1]], [[N]]
+// CHECK-NEXT:    [[SUB_I:%.*]] = fsub reassoc nnan ninf nsz arcp afn <2 x 
float> [[I]], [[MUL1_I]]
+// CHECK-NEXT:    ret <2 x float> [[SUB_I]]
+//
+// SPVCHECK-LABEL: define spir_func noundef nofpclass(nan inf) <2 x float> 
@_Z19test_reflect_float2Dv2_fS_(
+// SPVCHECK-SAME: <2 x float> noundef nofpclass(nan inf) [[I:%.*]], <2 x 
float> noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// SPVCHECK-NEXT:  [[ENTRY:.*:]]
+// SPVCHECK-NEXT:    [[SPV_REFLECT_I:%.*]] = tail call reassoc nnan ninf nsz 
arcp afn noundef <2 x float> @llvm.spv.reflect.v2f32(<2 x float> [[I]], <2 x 
float> [[N]])
+// SPVCHECK-NEXT:    ret <2 x float> [[SPV_REFLECT_I]]
+//
+float2 test_reflect_float2(float2 I, float2 N) {
+    return reflect(I, N);
+}
+
+// CHECK-LABEL: define noundef nofpclass(nan inf) <3 x float> 
@_Z19test_reflect_float3Dv3_fS_(
+// CHECK-SAME: <3 x float> noundef nofpclass(nan inf) [[I:%.*]], <3 x float> 
noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    [[HLSL_DOT_I:%.*]] = tail call reassoc nnan ninf nsz arcp 
afn float @llvm.dx.fdot.v3f32(<3 x float> [[I]], <3 x float> [[N]])
+// CHECK-NEXT:    [[DOTSCALAR:%.*]] = fmul reassoc nnan ninf nsz arcp afn 
float [[HLSL_DOT_I]], 2.000000e+00
+// CHECK-NEXT:    [[TMP0:%.*]] = insertelement <3 x float> poison, float 
[[DOTSCALAR]], i64 0
+// CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <3 x float> [[TMP0]], <3 x 
float> poison, <3 x i32> zeroinitializer
+// CHECK-NEXT:    [[MUL1_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn <3 x 
float> [[TMP1]], [[N]]
+// CHECK-NEXT:    [[SUB_I:%.*]] = fsub reassoc nnan ninf nsz arcp afn <3 x 
float> [[I]], [[MUL1_I]]
+// CHECK-NEXT:    ret <3 x float> [[SUB_I]]
+//
+// SPVCHECK-LABEL: define spir_func noundef nofpclass(nan inf) <3 x float> 
@_Z19test_reflect_float3Dv3_fS_(
+// SPVCHECK-SAME: <3 x float> noundef nofpclass(nan inf) [[I:%.*]], <3 x 
float> noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// SPVCHECK-NEXT:  [[ENTRY:.*:]]
+// SPVCHECK-NEXT:    [[SPV_REFLECT_I:%.*]] = tail call reassoc nnan ninf nsz 
arcp afn noundef <3 x float> @llvm.spv.reflect.v3f32(<3 x float> [[I]], <3 x 
float> [[N]])
+// SPVCHECK-NEXT:    ret <3 x float> [[SPV_REFLECT_I]]
+//
+float3 test_reflect_float3(float3 I, float3 N) {
+    return reflect(I, N);
+}
+
+// CHECK-LABEL: define noundef nofpclass(nan inf) <4 x float> 
@_Z19test_reflect_float4Dv4_fS_(
+// CHECK-SAME: <4 x float> noundef nofpclass(nan inf) [[I:%.*]], <4 x float> 
noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    [[HLSL_DOT_I:%.*]] = tail call reassoc nnan ninf nsz arcp 
afn float @llvm.dx.fdot.v4f32(<4 x float> [[I]], <4 x float> [[N]])
+// CHECK-NEXT:    [[DOTSCALAR:%.*]] = fmul reassoc nnan ninf nsz arcp afn 
float [[HLSL_DOT_I]], 2.000000e+00
+// CHECK-NEXT:    [[TMP0:%.*]] = insertelement <4 x float> poison, float 
[[DOTSCALAR]], i64 0
+// CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <4 x float> [[TMP0]], <4 x 
float> poison, <4 x i32> zeroinitializer
+// CHECK-NEXT:    [[MUL1_I:%.*]] = fmul reassoc nnan ninf nsz arcp afn <4 x 
float> [[TMP1]], [[N]]
+// CHECK-NEXT:    [[SUB_I:%.*]] = fsub reassoc nnan ninf nsz arcp afn <4 x 
float> [[I]], [[MUL1_I]]
+// CHECK-NEXT:    ret <4 x float> [[SUB_I]]
+//
+// SPVCHECK-LABEL: define spir_func noundef nofpclass(nan inf) <4 x float> 
@_Z19test_reflect_float4Dv4_fS_(
+// SPVCHECK-SAME: <4 x float> noundef nofpclass(nan inf) [[I:%.*]], <4 x 
float> noundef nofpclass(nan inf) [[N:%.*]]) local_unnamed_addr #[[ATTR0]] {
+// SPVCHECK-NEXT:  [[ENTRY:.*:]]
+// SPVCHECK-NEXT:    [[SPV_REFLECT_I:%.*]] = tail call reassoc nnan ninf nsz 
arcp afn noundef <4 x float> @llvm.spv.reflect.v4f32(<4 x float> [[I]], <4 x 
float> [[N]])
+// SPVCHECK-NEXT:    ret <4 x float> [[SPV_REFLECT_I]]
+//
+float4 test_reflect_float4(float4 I, float4 N) {
+    return reflect(I, N);
+}
diff --git a/clang/test/CodeGenSPIRV/Builtins/reflect.c 
b/clang/test/CodeGenSPIRV/Builtins/reflect.c
new file mode 100644
index 0000000000000..f51ac27a07457
--- /dev/null
+++ b/clang/test/CodeGenSPIRV/Builtins/reflect.c
@@ -0,0 +1,32 @@
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py 
UTC_ARGS: --version 5
+
+// RUN: %clang_cc1 -O1 -triple spirv-pc-vulkan-compute %s -emit-llvm -o - | 
FileCheck %s
+
+typedef float float2 __attribute__((ext_vector_type(2)));
+typedef float float3 __attribute__((ext_vector_type(3)));
+typedef float float4 __attribute__((ext_vector_type(4)));
+
+// CHECK-LABEL: define spir_func <2 x float> @test_reflect_float2(
+// CHECK-SAME: <2 x float> noundef [[X:%.*]], <2 x float> noundef [[Y:%.*]]) 
local_unnamed_addr #[[ATTR0:[0-9]+]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    [[SPV_REFLECT:%.*]] = tail call <2 x float> 
@llvm.spv.reflect.v2f32(<2 x float> [[X]], <2 x float> [[Y]])
+// CHECK-NEXT:    ret <2 x float> [[SPV_REFLECT]]
+//
+float2 test_reflect_float2(float2 X, float2 Y) { return 
__builtin_spirv_reflect(X, Y); }
+
+// CHECK-LABEL: define spir_func <3 x float> @test_reflect_float3(
+// CHECK-SAME: <3 x float> noundef [[X:%.*]], <3 x float> noundef [[Y:%.*]]) 
local_unnamed_addr #[[ATTR0]] {
+// CHECK-NEXT:  [[ENTRY:.*:]]
+// CHECK-NEXT:    [[SPV_REFLECT:%.*]] = tail call <3 x float> 
@llvm.spv.reflect.v3f32(<3 x float> [[X]], <3 x float> [[Y]])
+// CHECK-NEXT:    ret <3 x float> [[SPV_REFLECT]]
+//
+flo...
[truncated]

``````````

</details>


https://github.com/llvm/llvm-project/pull/125599
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