diff --git a/test/Feature/HLSLLib/D3DCOLORtoUBYTE4.test b/test/Feature/HLSLLib/D3DCOLORtoUBYTE4.test
new file mode 100644
index 00000000..dbf75ff7
--- /dev/null
+++ b/test/Feature/HLSLLib/D3DCOLORtoUBYTE4.test
@@ -0,0 +1,59 @@
+#--- source.hlsl
+StructuredBuffer<float4> In0 : register(t0);
+RWStructuredBuffer<uint4> Out0 : register(u1);
+
+[numthreads(1,1,1)]
+void main() {
+  Out0[0] = D3DCOLORtoUBYTE4(In0[0]);
+  Out0[1] = D3DCOLORtoUBYTE4(float4(0, 11.11, -50.5, 100));
+}
+//--- pipeline.yaml
+
+---
+Shaders:
+  - Stage: Compute
+    Entry: main
+    DispatchSize: [1, 1, 1]
+Buffers:
+  - Name: In0
+    Format: Float32
+    Stride: 16
+    Data: [0, 11.11, -50.5, 100]
+  - Name: Out0
+    Format: UInt32
+    Stride: 16
+    ZeroInitSize: 32
+  - Name: ExpectedOut0
+    Format: UInt32
+    Stride: 16
+    Data: [ 4294954419, 2833, 0, 25500, 4294954419, 2833, 0, 25500 ]
+Results:
+  - Result: Test0
+    Rule: BufferExact
+    Actual: Out0
+    Expected: ExpectedOut0
+DescriptorSets:
+  - Resources:
+    - Name: In0
+      Kind: StructuredBuffer
+      DirectXBinding:
+        Register: 0
+        Space: 0
+      VulkanBinding:
+        Binding: 0
+    - Name: Out0
+      Kind: RWStructuredBuffer
+      DirectXBinding:
+        Register: 1
+        Space: 0
+      VulkanBinding:
+        Binding: 1
+#--- end
+
+
+# https://github.com/llvm/llvm-project/issues/149561
+# XFAIL: Clang-Vulkan
+
+# RUN: split-file %s %t
+# RUN: %dxc_target -HV 202x -T cs_6_5 -Fo %t.o %t/source.hlsl
+# RUN: %offloader %t/pipeline.yaml %t.o