From f52b4de3b29ee27213b7d60fb620a0d5d50b49f9 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Tue, 29 Nov 2022 18:17:33 -0800
Subject: Allow `no_diff` modifier on parameters (#2538)

---
 tests/autodiff/no-diff-param.slang              | 23 +++++++++++++++++++++++
 tests/autodiff/no-diff-param.slang.expected.txt |  5 +++++
 2 files changed, 28 insertions(+)
 create mode 100644 tests/autodiff/no-diff-param.slang
 create mode 100644 tests/autodiff/no-diff-param.slang.expected.txt

(limited to 'tests')

diff --git a/tests/autodiff/no-diff-param.slang b/tests/autodiff/no-diff-param.slang
new file mode 100644
index 000000000..b7c754889
--- /dev/null
+++ b/tests/autodiff/no-diff-param.slang
@@ -0,0 +1,23 @@
+//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], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+typedef DifferentialPair<float> dpfloat;
+
+[ForwardDifferentiable]
+float f(float x, no_diff float y)
+{
+    return x * x + y * y;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    {
+        let rs = __fwd_diff(f)(dpfloat(1.5, 1.0), 2.0);
+        outputBuffer[0] = rs.p; // Expect: 6.25
+        outputBuffer[1] = rs.d; // Expect: 3.0
+    }
+}
diff --git a/tests/autodiff/no-diff-param.slang.expected.txt b/tests/autodiff/no-diff-param.slang.expected.txt
new file mode 100644
index 000000000..b4bbbf1d4
--- /dev/null
+++ b/tests/autodiff/no-diff-param.slang.expected.txt
@@ -0,0 +1,5 @@
+type: float
+6.250000
+3.000000
+0.000000
+0.000000
\ No newline at end of file
-- 
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