Update TargetLowering.cpp

Author: AZero13

llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp

@@ -9901,36 +9901,28 @@ SDValue TargetLowering::expandBSWAP(SDNode *N, SelectionDAG &DAG) const {
   case MVT::i32:
     // This is meant for ARM speficially, which has ROTR but no ROTL.
     if (isOperationLegalOrCustom(ISD::ROTR, VT)) {
-      EVT OpVT = Op.getValueType();
-      SDValue Src = Op;
-
       // ror rtmp, r0, #16
-      SDValue Ror16 = DAG.getNode(ISD::ROTR, dl, OpVT, Src,
-                                  DAG.getConstant(16, dl, SHVT));
+      SDValue Ror16 =
+          DAG.getNode(ISD::ROTR, dl, VT, Op, DAG.getConstant(16, dl, SHVT));
       // eor r1, r0, rtmp   ; r1 = r0 ^ (r0 ror 16)
-      SDValue Xor1 = DAG.getNode(ISD::XOR, dl, OpVT, Src, Ror16);
+      SDValue Xor1 = DAG.getNode(ISD::XOR, dl, VT, Op, Ror16);
 
       // bic r1, r1, #0xff0000 (clear bits 16-23)
       // BIC r1, r1, #0xff0000 becomes AND r1, r1, ~0x00ff0000
       // So we need the negated value: ~0x00FF0000 = 0xFF00FFFF
-      SDValue Mask = DAG.getConstant(0xFF00FFFFu, dl, OpVT);
-      SDValue BicResult = DAG.getNode(ISD::AND, dl, OpVT, Xor1, Mask);
+      SDValue Mask = DAG.getConstant(0xFF00FFFFu, dl, VT);
+      SDValue BicResult = DAG.getNode(ISD::AND, dl, VT, Xor1, Mask);
 
       // mov r1, r1, lsr #8
-      SDValue Lsr8 = DAG.getNode(ISD::SRL, dl, OpVT, BicResult,
+      SDValue Lsr8 = DAG.getNode(ISD::SRL, dl, VT, BicResult,
                                  DAG.getConstant(8, dl, SHVT));
 
       // ror r0, r0, #8
-      SDValue Ror8 = DAG.getNode(ISD::ROTR, dl, OpVT, Src,
-                                 DAG.getConstant(8, dl, SHVT));
+      SDValue Ror8 =
+          DAG.getNode(ISD::ROTR, dl, VT, Src, DAG.getConstant(8, dl, SHVT));
 
       // eor r0, Lsr8, Ror8
-      SDValue Result = DAG.getNode(ISD::XOR, dl, OpVT, Lsr8, Ror8);
-
-      if (OpVT != VT)
-        Result = DAG.getNode(ISD::TRUNCATE, dl, VT, Result);
-
-      return Result;
+      return DAG.getNode(ISD::XOR, dl, VT, Lsr8, Ror8);
     }
     Tmp4 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(24, dl, SHVT));
     Tmp3 = DAG.getNode(ISD::AND, dl, VT, Op,