Add a test case for dynamic dispatch with `This` type in interface decl. (#1431)

* Add a test case for dynamic dispatch with `This` type in interface decl.

* Update comments

* fix typo in comments

Co-authored-by: Tim Foley <tfoleyNV@users.noreply.github.com>

2 files changed, 43 insertions, 0 deletions

diff --git a/tests/compute/dynamic-dispatch-5.slang b/tests/compute/dynamic-dispatch-5.slang
new file mode 100644
index 000000000..6c403860b
--- /dev/null
+++ b/tests/compute/dynamic-dispatch-5.slang
@@ -0,0 +1,39 @@
+//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 general `This` type.
+
+interface IInterface
+{
+	int Compute(int inVal, This other);
+};
+
+int GenericCompute<T:IInterface>(int inVal, T obj, T other)
+{
+	return obj.Compute(inVal, other);
+}
+
+struct Impl : IInterface
+{
+    int base;
+	int Compute(int inVal, This other) { return other.base + base + inVal; }
+};
+int test(int inVal)
+{
+    Impl obj1, obj2;
+    obj1.base = 1;
+    obj2.base = 2;
+	return GenericCompute<Impl>(inVal, obj1, obj2);
+}
+
+//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 inVal = outputBuffer[tid];
+	int outVal = test(inVal);
+	outputBuffer[tid] = outVal;
+}
diff --git a/tests/compute/dynamic-dispatch-5.slang.expected.txt b/tests/compute/dynamic-dispatch-5.slang.expected.txt
new file mode 100644
index 000000000..dc5f2efd9
--- /dev/null
+++ b/tests/compute/dynamic-dispatch-5.slang.expected.txt
@@ -0,0 +1,4 @@
+3
+4
+5
+6