2 files changed, 96 insertions, 0 deletions
diff --git a/tests/autodiff-dstdlib/dstdlib-atan2.slang b/tests/autodiff-dstdlib/dstdlib-atan2.slang
new file mode 100644
index 000000000..c15222336
--- /dev/null
+++ b/tests/autodiff-dstdlib/dstdlib-atan2.slang
@@ -0,0 +1,85 @@
+//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 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+typedef DifferentialPair<float> dpfloat;
+typedef DifferentialPair<float2> dpfloat2;
+typedef DifferentialPair<float3> dpfloat3;
+
+[BackwardDifferentiable]
+float diffAtan2(float x, float y)
+{
+    return atan2(x, y);
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    float eps = 1e-4;
+    {
+        dpfloat dpx = dpfloat(5.0, 1.0);
+        dpfloat dpy = dpfloat(3.0, 0.0);
+        dpfloat res = __fwd_diff(diffAtan2)(dpx, dpy);
+        outputBuffer[0] = res.d;
+    }
+
+    {
+        dpfloat dpx = dpfloat(5.0, 0.0);
+        dpfloat dpy = dpfloat(3.0, 1.0);
+        dpfloat res = __fwd_diff(diffAtan2)(dpx, dpy);
+        outputBuffer[1] = res.d;
+    }
+
+    // Test the other 3 quadrants
+    {
+        dpfloat dpx = dpfloat(-5.0, 1.0);
+        dpfloat dpy = dpfloat(3.0, 0.0);
+        dpfloat res = __fwd_diff(diffAtan2)(dpx, dpy);
+        outputBuffer[2] = res.d;
+    }
+
+    {
+        dpfloat dpx = dpfloat(-5.0, 0.0);
+        dpfloat dpy = dpfloat(3.0, 1.0);
+        dpfloat res = __fwd_diff(diffAtan2)(dpx, dpy);
+        outputBuffer[3] = res.d;
+    }
+
+    {
+        dpfloat dpx = dpfloat(-5.0, 1.0);
+        dpfloat dpy = dpfloat(-3.0, 0.0);
+        dpfloat res = __fwd_diff(diffAtan2)(dpx, dpy);
+        outputBuffer[4] = res.d;
+    }
+
+    {
+        dpfloat dpx = dpfloat(-5.0, 0.0);
+        dpfloat dpy = dpfloat(-3.0, 1.0);
+        dpfloat res = __fwd_diff(diffAtan2)(dpx, dpy);
+        outputBuffer[5] = res.d;
+    }
+
+    {
+        dpfloat dpx = dpfloat(5.0, 1.0);
+        dpfloat dpy = dpfloat(-3.0, 0.0);
+        dpfloat res = __fwd_diff(diffAtan2)(dpx, dpy);
+        outputBuffer[6] = res.d;
+    }
+
+    {
+        dpfloat dpx = dpfloat(5.0, 0.0);
+        dpfloat dpy = dpfloat(-3.0, 1.0);
+        dpfloat res = __fwd_diff(diffAtan2)(dpx, dpy);
+        outputBuffer[7] = res.d;
+    }
+
+    {
+        dpfloat dpx = diffPair(5.0);
+        dpfloat dpy = diffPair(3.0);
+        __bwd_diff(diffAtan2)(dpx, dpy, 1.0);
+        outputBuffer[8] = dpx.d; // Should be equal to outputBuffer[0]
+        outputBuffer[9] = dpy.d; // Should be equal to outputBuffer[2]
+    }
+}
diff --git a/tests/autodiff-dstdlib/dstdlib-atan2.slang.expected.txt b/tests/autodiff-dstdlib/dstdlib-atan2.slang.expected.txt
new file mode 100644
index 000000000..5adffdaef
--- /dev/null
+++ b/tests/autodiff-dstdlib/dstdlib-atan2.slang.expected.txt
@@ -0,0 +1,11 @@
+type: float
+0.088235
+-0.147059
+0.088235
+0.147059
+-0.088235
+0.147059
+-0.088235
+-0.147059
+0.088235
+-0.147059