SPV: Implement Vulkan 1.1 features and extensions.
diff --git a/Test/spv.subgroup.tesc b/Test/spv.subgroup.tesc
new file mode 100644
index 0000000..63bf5e5
--- /dev/null
+++ b/Test/spv.subgroup.tesc
@@ -0,0 +1,12 @@
+#version 450

+#extension GL_KHR_shader_subgroup_basic: enable

+layout(vertices=1) out;

+layout(set = 0, binding = 0, std430) buffer Output

+{

+  uvec4 result[];

+};

+

+void main (void)

+{

+  result[gl_PrimitiveID] = uvec4(gl_SubgroupSize, gl_SubgroupInvocationID, 0, 0);

+}