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

* Tuple swizzling and element access.

* Update proposal status.

* Cleanup.

* Fix merrge error.

* Address review.

1 files changed, 25 insertions, 0 deletions

diff --git a/tests/language-feature/tuple/tuple-basic.slang b/tests/language-feature/tuple/tuple-basic.slang
new file mode 100644
index 000000000..113c066be
--- /dev/null
+++ b/tests/language-feature/tuple/tuple-basic.slang
@@ -0,0 +1,25 @@
+// Test tuple swizzling and element access.
+
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-shaderobj
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-dx12 -use-dxil -shaderobj
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu -shaderobj
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-vk -shaderobj
+
+//TEST_INPUT:ubuffer(data=[1 2 3 4], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+void store(inout Tuple<int, float, uint> t)
+{
+    t._1_2 = Tuple<float, uint>(3.0, 4);
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    var t = Tuple<int, float, uint>(1, 2.0, 3u);
+    store(t);
+    let y = t._1_2_0;
+
+    // CHECK: 4
+    outputBuffer[0] = y._1;
+}