[clang] [CIR] Add rotate operation (PR #148426)

[Henrich Lauko via cfe-commits]

================
@@ -2847,6 +2847,37 @@ def ByteSwapOp : CIR_BitOpBase<"byte_swap", CIR_UIntOfWidths<[16, 32, 64]>> {
   }];
 }
 
+//===----------------------------------------------------------------------===//
+// RotateOp
+//===----------------------------------------------------------------------===//
+
+def RotateOp : CIR_Op<"rotate", [Pure, SameOperandsAndResultType]> {
+  let summary = "Rotate the bits in the operand integer";
+  let description = [{
+    The `cir.rotate` rotates the bits in `input` by the given amount `amount`.
+    The rotate direction is specified by the `left` and `right` keyword.
+
+    The width of the input integer must be either 8, 16, 32, or 64. `input`,
+    `amount`, and `result` must be of the same type.
+
+    Example:
+
+    ```mlir
+    %r = cir.rotate left %0, %1 -> !u32i
+    %r = cir.rotate right %0, %1 -> !u32i
+    ```
+  }];
+
+  let results = (outs CIR_IntType:$result);
+  let arguments = (ins CIR_IntType:$input, CIR_IntType:$amount,
+                       UnitAttr:$isRotateLeft);
----------------
xlauko wrote:

```suggestion
 
  let arguments = (ins 
    CIR_UIntOfWidths<[8, 16, 32, 64]>:$input, 
    CIR_IntType:$amount,
    UnitAttr:$rotateLeft
  );

  let results = (outs CIR_IntType:$result);
```

https://github.com/llvm/llvm-project/pull/148426