Adding some math functions and their derivatives (#2497)

1 files changed, 43 insertions, 0 deletions

diff --git a/tests/autodiff-dstdlib/dstdlib-abs.slang b/tests/autodiff-dstdlib/dstdlib-abs.slang
new file mode 100644
index 000000000..0da2de4c7
--- /dev/null
+++ b/tests/autodiff-dstdlib/dstdlib-abs.slang
@@ -0,0 +1,43 @@
+//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], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+typedef DifferentialPair<float> dpfloat;
+typedef DifferentialPair<float2> dpfloat2;
+typedef DifferentialPair<float3> dpfloat3;
+
+[ForwardDifferentiable]
+float diffAbs(float x)
+{
+    return abs(x);
+}
+
+[ForwardDifferentiable]
+float3 diffAbs3(float3 x)
+{
+    return abs(x);
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    {
+        dpfloat dpx = dpfloat(-3.0, 2.0);
+        dpfloat res = __fwd_diff(diffAbs)(dpx);
+        outputBuffer[0] = res.p;               // Expect: 3.000000
+        outputBuffer[1] = res.d;               // Expect: -2.000000
+    }
+
+    {
+        dpfloat3 dpx = dpfloat3(float3(2.f, -3.f, -1.f), float3(-2.f, 3.f, -1.f));
+        dpfloat3 res = __fwd_diff(diffAbs3)(dpx);
+        outputBuffer[2] = res.p[0];            // Expect: 2.000000
+        outputBuffer[3] = res.d[0];            // Expect: -2.000000
+        outputBuffer[4] = res.p[1];            // Expect: 3.000000
+        outputBuffer[5] = res.d[1];            // Expect: -3.000000
+        outputBuffer[6] = res.p[2];           // Expect: 1.000000
+        outputBuffer[7] = res.d[2];           // Expect: 1.000000
+    }
+}