Tuple swizzling, concat, comparison and `countof`. (#4856)

* Tuple swizzling and element access.

* Update proposal status.

* Cleanup.

* Fix merrge error.

* Address review.

1 files changed, 36 insertions, 0 deletions

diff --git a/tests/language-feature/tuple/tuple-concat.slang b/tests/language-feature/tuple/tuple-concat.slang
new file mode 100644
index 000000000..93765380d
--- /dev/null
+++ b/tests/language-feature/tuple/tuple-concat.slang
@@ -0,0 +1,36 @@
+// Test tuple swizzling and element access.
+
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-dx12 -use-dxil -shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu -shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-vk -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[1 2 3 4], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+struct GetCount<let N : int>
+{
+    static const int value = N;
+}
+
+int getCount<each T>(Tuple<T> t)
+{
+    return GetCount<countof(T)>.value;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    var t = makeTuple(1, 2.0);
+    var u = makeTuple(3u, 4.0);
+    var r = concat(t, u);
+
+    // CHECK: 4
+    outputBuffer[0] = (int)r._3_2._0;
+
+    // CHECK: 2
+    outputBuffer[1] = (int)r._1;
+
+    // CHECK: 8
+    outputBuffer[2] = countof(r) + getCount(r);
+}