From 86675155eb79532039ba79655ed14a76998e9f85 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Wed, 15 Feb 2023 17:18:00 -0800
Subject: Treat user defined backward derivative function as non
 differentiable. (#2650)

Co-authored-by: Yong He <yhe@nvidia.com>
---
 tests/autodiff/backward-diff-check.slang           | 27 ++++++++++++++++++++++
 .../backward-diff-check.slang.expected.txt         |  6 +++++
 2 files changed, 33 insertions(+)
 create mode 100644 tests/autodiff/backward-diff-check.slang
 create mode 100644 tests/autodiff/backward-diff-check.slang.expected.txt

(limited to 'tests')

diff --git a/tests/autodiff/backward-diff-check.slang b/tests/autodiff/backward-diff-check.slang
new file mode 100644
index 000000000..2718f31f1
--- /dev/null
+++ b/tests/autodiff/backward-diff-check.slang
@@ -0,0 +1,27 @@
+//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()
+{
+    return 2.0f;
+}
+
+float noDiffFunc(float x) { return x; }
+[BackwardDerivativeOf(test)]
+void d_test(float dOut)
+{
+    outputBuffer[0] = noDiffFunc(dOut);
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    __bwd_diff(test)(3.0f);
+}
diff --git a/tests/autodiff/backward-diff-check.slang.expected.txt b/tests/autodiff/backward-diff-check.slang.expected.txt
new file mode 100644
index 000000000..72bbdbbcd
--- /dev/null
+++ b/tests/autodiff/backward-diff-check.slang.expected.txt
@@ -0,0 +1,6 @@
+type: float
+3.000000
+0.000000
+0.000000
+0.000000
+0.000000
-- 
cgit v1.2.3