Allow ArrayStride on untyped pointers (KhronosGroup#5746)

Author: alan-baker

source/val/validate_annotation.cpp

@@ -123,7 +123,8 @@ spv_result_t ValidateDecorationTarget(ValidationState_t& _, spv::Decoration dec,
     case spv::Decoration::ArrayStride:
       if (target->opcode() != spv::Op::OpTypeArray &&
           target->opcode() != spv::Op::OpTypeRuntimeArray &&
-          target->opcode() != spv::Op::OpTypePointer) {
+          target->opcode() != spv::Op::OpTypePointer &&
+          target->opcode() != spv::Op::OpTypeUntypedPointerKHR) {
         return fail(0) << "must be an array or pointer type";
       }
       break;

test/val/val_annotation_test.cpp

@@ -257,6 +257,22 @@ OpFunctionEnd
   EXPECT_EQ(SPV_SUCCESS, ValidateInstructions());
 }
 
+TEST_F(DecorationTest, ArrayStrideUntypedPointerKHR) {
+  const std::string text = R"(
+OpCapability Shader
+OpCapability Linkage
+OpCapability UntypedPointersKHR
+OpExtension "SPV_KHR_untyped_pointers"
+OpExtension "SPV_KHR_storage_buffer_storage_class"
+OpMemoryModel Logical GLSL450
+OpDecorate %ptr ArrayStride 4
+%ptr = OpTypeUntypedPointerKHR StorageBuffer
+)";
+
+  CompileSuccessfully(text);
+  EXPECT_EQ(SPV_SUCCESS, ValidateInstructions());
+}
+
 using MemberOnlyDecorations = spvtest::ValidateBase<std::string>;
 
 TEST_P(MemberOnlyDecorations, MemberDecoration) {