1 files changed, 47 insertions, 0 deletions
diff --git a/tests/autodiff/force-inline-differentiable.slang b/tests/autodiff/force-inline-differentiable.slang
new file mode 100644
index 000000000..5d22a525f
--- /dev/null
+++ b/tests/autodiff/force-inline-differentiable.slang
@@ -0,0 +1,47 @@
+//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHECK): -slang -compute -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+// A general test for differentiable, force-inlined functions.
+//
+// This test was added to expose a bug in legalizeDefUse() where an IRVar can be be hoisted to 
+// after its uses (when it is already in the same block, but gets reinserted), and cause 
+// a validation bug.
+// 
+
+__generic<T : __BuiltinFloatingPointType, let R : int, let C : int>
+[ForceInline, PreferRecompute, Differentiable]
+vector<T, R> column(matrix<T, R, C> m, int i) {
+    vector<T, R> result;
+    [ForceUnroll]
+    for (int j = 0; j < R; j++) {
+        result[j] = m[j][i];
+    }
+    return result;
+}
+
+struct Data {
+    float4x4 m;
+    float foo() {
+        return length(column(m, 0).xyz);
+    }
+};
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 id : SV_DispatchThreadID)
+{
+    Data data;
+    // Initialize matrix with some values
+    data.m = float4x4(
+        3.0, 0.0, 0.0, 0.0,
+        0.0, 5.0, 0.0, 0.0,
+        0.0, 0.0, 7.0, 0.0,
+        0.0, 0.0, 0.0, 11.0);
+    
+    // Calculate and store result
+    outputBuffer[0] = data.foo();
+    
+    // CHECK: type: float
+    // CHECK: 3.0
+}
+\ No newline at end of file