[VE] Use SelectionDAG::getSignedConstant/getAllOnesConstant.

Author: topperc

llvm/lib/Target/VE/VECustomDAG.cpp

@@ -410,7 +410,7 @@ SDValue VECustomDAG::getConstantMask(Packing Packing, bool AllTrue) const {
   auto MaskVT = getLegalVectorType(Packing, MVT::i1);
 
   // VEISelDAGtoDAG will replace this pattern with the constant-true VM.
-  auto TrueVal = DAG.getConstant(-1, DL, MVT::i32);
+  auto TrueVal = DAG.getAllOnesConstant(DL, MVT::i32);
   auto AVL = getConstant(MaskVT.getVectorNumElements(), MVT::i32);
   auto Res = getNode(VEISD::VEC_BROADCAST, MaskVT, {TrueVal, AVL});
   if (AllTrue)

llvm/lib/Target/VE/VEInstrInfo.td

@@ -44,8 +44,8 @@ def ULO7 : SDNodeXForm<imm, [{
                                    SDLoc(N), MVT::i32);
 }]>;
 def LO7 : SDNodeXForm<imm, [{
-  return CurDAG->getTargetConstant(SignExtend32(N->getSExtValue(), 7),
-                                   SDLoc(N), MVT::i32);
+  return CurDAG->getSignedConstant(SignExtend64(N->getSExtValue(), 7),
+                                   SDLoc(N), MVT::i32, /*isTarget=*/true);
 }]>;
 def MIMM : SDNodeXForm<imm, [{
   return CurDAG->getTargetConstant(val2MImm(getImmVal(N)),