Added a vector intrinsic definition for exp (to serve as template for other vector intrinsics) (#2481)

* Added vector exp definition

* Naming

1 files changed, 26 insertions, 0 deletions

diff --git a/tests/autodiff/dstdlib-vector.slang b/tests/autodiff/dstdlib-vector.slang
new file mode 100644
index 000000000..44315daf6
--- /dev/null
+++ b/tests/autodiff/dstdlib-vector.slang
@@ -0,0 +1,26 @@
+//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;
+
+[ForwardDifferentiable]
+float f(float x)
+{
+    float3 vx = float3(x, 2*x, 3*x);
+    float3 vexpx = dstd.exp(vx);
+    return vexpx.x + vexpx.y + vexpx.z;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    {
+        dpfloat dpa = dpfloat(2.0, 1.0);
+
+        outputBuffer[0] = f(dpa.p());        // Expect: 465.415999
+        outputBuffer[1] = __fwd_diff(f)(dpa).d(); // Expect: 1326.871736
+    }
+}
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