Dynamic code gen for functions returning generic types. (#1439)

* Dynamic code gen for functions returning generic types.

* Add expected test result.

2 files changed, 59 insertions, 0 deletions

diff --git a/tests/compute/dynamic-dispatch-6.slang b/tests/compute/dynamic-dispatch-6.slang
new file mode 100644
index 000000000..f9631713d
--- /dev/null
+++ b/tests/compute/dynamic-dispatch-6.slang
@@ -0,0 +1,55 @@
+//TEST(compute):COMPARE_COMPUTE:-cpu -xslang -allow-dynamic-code
+//DISABLE_TEST(compute):COMPARE_COMPUTE:-cuda -xslang -allow-dynamic-code
+
+// Test dynamic dispatch code gen for generic-typed return values.
+
+interface IInterface
+{
+    [mutating]
+    void SetVal(int inVal);
+    int Compute();
+};
+
+T CreateT_Inner<T:IInterface>(int inVal)
+{
+    T obj;
+    obj.SetVal(inVal);
+    return obj;
+}
+
+T CreateT<T:IInterface>(int inVal)
+{
+    return CreateT_Inner<T>(inVal);
+}
+
+struct Impl : IInterface
+{
+    int base;
+    [mutating]
+    void SetVal(int inVal)
+    {
+        base = inVal;
+    }
+    int Compute()
+    {
+        return base;
+    }
+};
+
+int test()
+{
+    var obj = CreateT<Impl>(3);
+    var obj2 = CreateT_Inner<Impl>(1);
+    return obj.Compute() + obj2.Compute();
+}
+
+//TEST_INPUT:ubuffer(data=[0 1 2 3], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer : register(u0);
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    uint tid = dispatchThreadID.x;
+    int outVal = test();
+    outputBuffer[tid] = outVal;
+}
diff --git a/tests/compute/dynamic-dispatch-6.slang.expected.txt b/tests/compute/dynamic-dispatch-6.slang.expected.txt
new file mode 100644
index 000000000..e785149d2
--- /dev/null
+++ b/tests/compute/dynamic-dispatch-6.slang.expected.txt
@@ -0,0 +1,4 @@
+4
+4
+4
+4