From e93cb8a4d1bb7d835bc3762ce25ced422e75e97a Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Fri, 20 Dec 2024 00:53:49 -0800
Subject: Check subscript/property accessor for differentiability. (#5922)

---
 tests/autodiff/subscript.slang | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 tests/autodiff/subscript.slang

(limited to 'tests')

diff --git a/tests/autodiff/subscript.slang b/tests/autodiff/subscript.slang
new file mode 100644
index 000000000..2b16597c0
--- /dev/null
+++ b/tests/autodiff/subscript.slang
@@ -0,0 +1,33 @@
+//TEST:COMPARE_COMPUTE(filecheck-buffer=CHK): -output-using-type
+
+interface ITest
+{
+    __subscript(int i) -> float
+    {
+        [BackwardDifferentiable] get;
+    }
+}
+struct Test : ITest
+{
+    __subscript(int i) -> float
+    {
+        [BackwardDifferentiable] get { return 5.0f * i; }
+    }
+}
+
+[Differentiable]
+float test(ITest arg)
+{
+    return arg[1];
+}
+
+//TEST_INPUT:set output = out ubuffer(data=[0 0 0 0], stride=4)
+RWStructuredBuffer<float> output;
+
+[numthreads(1,1,1)]
+void computeMain()
+{
+    Test t = {};
+    output[0] = test(t);
+    // CHK: 5.0
+}
\ No newline at end of file
-- 
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