Fixed derivatives for kIROp_Neg and kIROp_Div, added another test (#2639)

2 files changed, 86 insertions, 0 deletions

diff --git a/tests/autodiff/reverse-arithmetic.slang b/tests/autodiff/reverse-arithmetic.slang
new file mode 100644
index 000000000..4e13251e4
--- /dev/null
+++ b/tests/autodiff/reverse-arithmetic.slang
@@ -0,0 +1,78 @@
+//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj -output-using-type
+//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+typedef DifferentialPair<float> dpfloat;
+typedef float.Differential dfloat;
+
+[BackwardDifferentiable]
+float f(float x)
+{
+    return x;
+}
+
+[BackwardDifferentiable]
+float h(float x, float y)
+{
+    float m = x + y;
+    float n = x - y;
+    return m * n + 2 * x * y;
+}
+
+[BackwardDifferentiable]
+float j(float x, float y)
+{
+    float m = x / y;
+    return m * y;
+}
+
+[BackwardDifferentiable]
+float k(float x, float y)
+{
+    float m = -x;
+    return m * y;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    {
+        dpfloat dpa = dpfloat(2.0, 1.0);
+
+        __bwd_diff(f)(dpa, 1.0);
+
+        outputBuffer[0] = dpa.d; // Expect: 1
+    }
+
+    {
+        dpfloat dpa = dpfloat(2.0, 1.0);
+        dpfloat dpb = dpfloat(1.5, 1.0);
+
+        __bwd_diff(h)(dpa, dpb, 1.0);
+
+        outputBuffer[1] = dpa.d; // Expect: (2 * 2.0) + (2 * 1.5) = 7.0
+        outputBuffer[2] = dpb.d; // Expect: -(2 * 1.5) + (2 * 2.0) = 1.0
+    }
+
+    {
+        dpfloat dpa = dpfloat(2.0, 1.0);
+        dpfloat dpb = dpfloat(1.5, 1.0);
+
+        __bwd_diff(j)(dpa, dpb, 1.0);
+
+        outputBuffer[3] = dpa.d; // Expect: 1
+        outputBuffer[4] = dpb.d; // Expect: 0
+    }
+
+    {
+        dpfloat dpa = dpfloat(2.0, 1.0);
+        dpfloat dpb = dpfloat(1.5, 1.0);
+
+        __bwd_diff(k)(dpa, dpb, 1.0);
+
+        outputBuffer[5] = dpa.d; // Expect: -1.5
+        outputBuffer[6] = dpb.d; // Expect: -2.0
+    }
+}
diff --git a/tests/autodiff/reverse-arithmetic.slang.expected.txt b/tests/autodiff/reverse-arithmetic.slang.expected.txt
new file mode 100644
index 000000000..297192e6c
--- /dev/null
+++ b/tests/autodiff/reverse-arithmetic.slang.expected.txt
@@ -0,0 +1,8 @@
+type: float
+1.000000
+7.000000
+1.000000
+1.000000
+0.000000
+-1.500000
+-2.000000