2 files changed, 58 insertions, 0 deletions
diff --git a/tests/autodiff/dynamic-dispatch-bwd-diff.slang b/tests/autodiff/dynamic-dispatch-bwd-diff.slang
new file mode 100644
index 000000000..5945c22cd
--- /dev/null
+++ b/tests/autodiff/dynamic-dispatch-bwd-diff.slang
@@ -0,0 +1,52 @@
+// Test calling backward differentiable function through dynamic dispatch.
+
+//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj -output-using-type
+//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+[anyValueSize(16)]
+interface IInterface
+{
+    [BackwardDifferentiable]
+    float calc(float x);
+}
+
+struct A : IInterface
+{
+    float a;
+    [BackwardDifferentiable]
+    float calc(float x) { return a*x*x; }
+};
+
+struct B : IInterface
+{
+    float a;
+    [BackwardDifferentiable]
+    float calc(float x) { return a*x*x*x; }
+};
+
+[BackwardDifferentiable]
+float run(IInterface obj, float x)
+{
+    return obj.calc(x);
+}
+
+//TEST_INPUT: type_conformance A:IInterface = 0
+//TEST_INPUT: type_conformance B:IInterface = 1
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    var obj = createDynamicObject<IInterface>(dispatchThreadID.x, 0.5f); // A
+    var p = diffPair(3.0);
+
+    __bwd_diff(run)(obj, p, 1.0f);
+    outputBuffer[0] = p.d; // A.calc, expect 3
+
+    obj = createDynamicObject<IInterface>(dispatchThreadID.x + 1, 1.5f); // B
+    p = diffPair(3.0);
+    __bwd_diff(run)(obj, p, 1.0f);
+    outputBuffer[1] = p.d; // B.calc, expect 40.5
+}
diff --git a/tests/autodiff/dynamic-dispatch-bwd-diff.slang.expected.txt b/tests/autodiff/dynamic-dispatch-bwd-diff.slang.expected.txt
new file mode 100644
index 000000000..57bb1ee65
--- /dev/null
+++ b/tests/autodiff/dynamic-dispatch-bwd-diff.slang.expected.txt
@@ -0,0 +1,6 @@
+type: float
+3.000000
+40.500000
+0.000000
+0.000000
+0.000000