AD: Primal-Hoisting Rework + Checkpoint Policy Framework (#2702)

1 files changed, 42 insertions, 0 deletions

diff --git a/tests/autodiff/reverse-control-flow-1.slang b/tests/autodiff/reverse-control-flow-1.slang
new file mode 100644
index 000000000..7d2f518be
--- /dev/null
+++ b/tests/autodiff/reverse-control-flow-1.slang
@@ -0,0 +1,42 @@
+//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;
+
+typedef DifferentialPair<float> dpfloat;
+typedef float.Differential dfloat;
+
+[BackwardDifferentiable]
+float test_single_branch(float y)
+{
+    float o;
+    if (y > 0.5)
+    {
+        o = y * 2.0f;
+    }
+    else
+    {
+        o = y + 1.0f;
+    }
+
+    return o;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    {
+        dpfloat dpa = dpfloat(1.0, 0.0);
+
+        __bwd_diff(test_single_branch)(dpa, 1.0f);
+        outputBuffer[0] = dpa.d; // Expect: 2.0
+    }
+
+    {
+        dpfloat dpa = dpfloat(0.4, 0.0);
+        
+        __bwd_diff(test_single_branch)(dpa, 1.0f);
+        outputBuffer[1] = dpa.d; // Expect: 1.0
+    }
+}