diff --git a/tests/hlsl/round.shader_test b/tests/hlsl/round.shader_test
index c76709734..9fb087974 100644
--- a/tests/hlsl/round.shader_test
+++ b/tests/hlsl/round.shader_test
@@ -44,3 +44,14 @@ float4 main() : sv_target
 uniform 0 float4 -1 0 2 10
 draw quad
 todo(msl & sm>=6) probe (0, 0) f32(-1.0, 0.0, 2.0, 10.0) 4
+
+[pixel shader]
+float4 main() : sv_target
+{
+    return round(float4(-1.5, -0.5, 0.5, 1.5));
+}
+
+[test]
+draw quad
+if(sm<6)  todo(sm>=4) probe (0, 0) f32(-1.0,  0.0, 1.0, 2.0)
+if(sm>=6) probe (0, 0) f32(-2.0, -0.0, 0.0, 2.0)