[clang] [CIR] Upstream splat op for VectorType (PR #139827)

[Amr Hesham via cfe-commits]

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@@ -2037,4 +2037,37 @@ def VecExtractOp : CIR_Op<"vec.extract", [Pure,
   let hasFolder = 1;
 }
 
+
+//===----------------------------------------------------------------------===//
+// VecSplat
+//===----------------------------------------------------------------------===//
+
+// cir.vec.splat is a separate operation from cir.vec.create because more
+// efficient LLVM IR can be generated for it, and because some optimization and
+// analysis passes can benefit from knowing that all elements of the vector
+// have the same value.
+
+def VecSplatOp : CIR_Op<"vec.splat", [Pure,
+  TypesMatchWith<"type of 'value' matches element type of 'result'", "result",
+                 "value", "cast<VectorType>($_self).getElementType()">]> {
+
+  let summary = "Convert a scalar into a vector";
+  let description = [{
+    The `cir.vec.splat` operation creates a vector value from a scalar value.
+    All elements of the vector have the same value, that of the given scalar.
+
+    ```mlir
+   %value = cir.const #cir.int<3> : !s32i
+   %value_vec = cir.vec.splat %value : !s32i, !cir.vector<4 x !s32i>
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AmrDeveloper wrote:

Sure i will update it, thanks

https://github.com/llvm/llvm-project/pull/139827