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

* Tuple swizzling and element access.

* Update proposal status.

* Cleanup.

* Fix merrge error.

* Address review.

1 files changed, 44 insertions, 0 deletions

diff --git a/tests/language-feature/tuple/tuple-compare.slang b/tests/language-feature/tuple/tuple-compare.slang
new file mode 100644
index 000000000..b4d0e7833
--- /dev/null
+++ b/tests/language-feature/tuple/tuple-compare.slang
@@ -0,0 +1,44 @@
+// Test tuple comparison.
+
+//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;
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    var t = makeTuple(1, 2, 2.0);
+    var u = makeTuple(1, 3, 2.0);
+
+    // CHECK: 1
+    if (t._0_2 == u._0_2 && t != u)
+        outputBuffer[0] = 1;
+
+    int result = 1;
+    if (t < t) result = 0;
+    if (!(t <= t)) result = 0;
+    if (t != t) result = 0;
+    if (t > t) result = 0;
+    if (!(t >= t)) result = 0;
+
+    if (!(t < u)) result = 0;
+    if (!(t <= u)) result = 0;
+    if (!(t != u)) result = 0;
+    if (t == u) result = 0;
+    if (t > u) result = 0;
+    if (t >= u) result = 0;
+
+    if (!(u > t)) result = 0;
+    if (!(u >= t)) result = 0;
+    if (!(u != t)) result = 0;
+    if (u == t) result = 0;
+    if (u < t) result = 0;
+    if (u <= t) result = 0;
+
+    // CHECK: 1
+    outputBuffer[1] = result;
+}