From 25affe8e724fe4ee60a3b8ec2c494926930ba59f Mon Sep 17 00:00:00 2001
From: winmad <winmad.wlf@gmail.com>
Date: Mon, 14 Nov 2022 16:43:55 -0800
Subject: Adding some math functions and their derivatives (#2497)

---
 tests/autodiff-dstdlib/dstdlib-sqrt.slang | 40 +++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 tests/autodiff-dstdlib/dstdlib-sqrt.slang

(limited to 'tests/autodiff-dstdlib/dstdlib-sqrt.slang')

diff --git a/tests/autodiff-dstdlib/dstdlib-sqrt.slang b/tests/autodiff-dstdlib/dstdlib-sqrt.slang
new file mode 100644
index 000000000..9ef69ea34
--- /dev/null
+++ b/tests/autodiff-dstdlib/dstdlib-sqrt.slang
@@ -0,0 +1,40 @@
+//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], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+typedef DifferentialPair<float> dpfloat;
+typedef DifferentialPair<float2> dpfloat2;
+typedef DifferentialPair<float3> dpfloat3;
+
+[ForwardDifferentiable]
+float diffSqrt(float x)
+{
+    return sqrt(x);
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    {
+        dpfloat dpx = dpfloat(2.0, 1.0);
+        dpfloat res = __fwd_diff(diffSqrt)(dpx);
+        outputBuffer[0] = res.p;               // Expect: 1.414214
+        outputBuffer[1] = res.d;               // Expect: 0.353553
+    }
+
+    {
+        dpfloat dpx = dpfloat(100.0, -3.0);
+        dpfloat res = __fwd_diff(diffSqrt)(dpx);
+        outputBuffer[2] = res.p;               // Expect: 10.000000
+        outputBuffer[3] = res.d;               // Expect: -0.150000
+    }
+
+    {
+        dpfloat dpx = dpfloat(0.0, 1.0);
+        dpfloat res = __fwd_diff(diffSqrt)(dpx);
+        outputBuffer[4] = res.p; // Expect: 0.000000
+        outputBuffer[5] = res.d; // Expect: 0.000000
+    }
+}
-- 
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