1 files changed, 41 insertions, 0 deletions
diff --git a/tests/autodiff/for-loop-eliminate-dead-code.slang b/tests/autodiff/for-loop-eliminate-dead-code.slang
new file mode 100644
index 000000000..be1093c23
--- /dev/null
+++ b/tests/autodiff/for-loop-eliminate-dead-code.slang
@@ -0,0 +1,41 @@
+//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+static const uint kMaxSurfaceBounces = 2;
+
+[BackwardDifferentiable]
+void updatePathContrib(inout float3 result, float3 val)
+{
+    result = result + val;
+}
+
+[BackwardDifferentiable]
+float3 evalPath(uint2 pixel)
+{
+    float3 result = float3(0.f);
+    float3 thp = float3(1.f);
+
+    [MaxIters(kMaxSurfaceBounces)]
+    for (int i = 0; i < kMaxSurfaceBounces; i++)
+    {
+        float3 neeContrib = float3(1.f);
+        updatePathContrib(result, thp * neeContrib);
+        thp = thp * float3(0.9f);
+    }
+    return result;
+}
+
+void execute(const uint2 pixel)
+{
+    float3 dColor = float3(1.f);
+    __bwd_diff(evalPath)(pixel, dColor);
+}
+
+[numthreads(64, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    execute(dispatchThreadID.xy);
+}