Fix rotation

Author: AZero13

llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp

@@ -9897,19 +9897,19 @@ SDValue TargetLowering::expandBSWAP(SDNode *N, SelectionDAG &DAG) const {
     return SDValue();
   case MVT::i16:
     // Use a rotate by 8. This can be further expanded if necessary.
-    return DAG.getNode(ISD::ROTL, dl, VT, Op, DAG.getConstant(8, dl, SHVT));
+    return DAG.getNode(ISD::ROTR, dl, VT, Op, DAG.getConstant(8, dl, SHVT));
   case MVT::i32:
     if (isOperationLegal(ISD::ROTR, VT)) {
-      // (x & 0x00FF00FF) rotl 8 | (x rotr 8) & 0x00FF00FF
+      // (x & 0x00FF00FF) rotr 8 | (x rotl 8) & 0x00FF00FF
       SDValue And = DAG.getNode(ISD::AND, dl, VT, Op,
                                 DAG.getConstant(0x00FF00FF, dl, VT));
-      SDValue Rotl =
-          DAG.getNode(ISD::ROTL, dl, VT, And, DAG.getConstant(8, dl, SHVT));
       SDValue Rotr =
-          DAG.getNode(ISD::ROTR, dl, VT, Op, DAG.getConstant(8, dl, SHVT));
-      SDValue And2 = DAG.getNode(ISD::AND, dl, VT, Rotr,
+          DAG.getNode(ISD::ROTR, dl, VT, And, DAG.getConstant(8, dl, SHVT));
+      SDValue Rotl =
+          DAG.getNode(ISD::ROTL, dl, VT, Op, DAG.getConstant(8, dl, SHVT));
+      SDValue And2 = DAG.getNode(ISD::AND, dl, VT, Rotl,
                                  DAG.getConstant(0x00FF00FF, dl, VT));
-      return DAG.getNode(ISD::OR, dl, VT, Rotl, And2);
+      return DAG.getNode(ISD::OR, dl, VT, Rotr, And2);
     }
     Tmp4 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(24, dl, SHVT));
     Tmp3 = DAG.getNode(ISD::AND, dl, VT, Op,