Fix issues around dynamic generic function and autodiff. (#2528)

* Fix issues around dynamic generic function and autodiff.

* Fix return type issue.

* Fix type unification for generic `inout` parameter.

* Fix.

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/autodiff/bool-return-val.slang b/tests/autodiff/bool-return-val.slang
new file mode 100644
index 000000000..a43495dd9
--- /dev/null
+++ b/tests/autodiff/bool-return-val.slang
@@ -0,0 +1,28 @@
+//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;
+
+struct NonDiff
+{
+    float a;
+}
+
+[ForwardDifferentiable]
+bool myFunc(NonDiff fIn, inout float x)
+{
+    x = pow(x, fIn.a);
+    return x > 100.f;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    float a = 10.0;
+    NonDiff fIn = { a };
+    DifferentialPair<float> dpx = DifferentialPair<float>(4.f, 1.f);
+    bool res = __fwd_diff(myFunc)(fIn, dpx);
+
+    outputBuffer[0] = res?1:0;
+}
\ No newline at end of file