[AArch64] Add getCondCode() helper (NFC) (#150521)

Follow-up to #150313.

Author: s-barannikov

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -162,10 +162,10 @@ static cl::opt<bool> UseFEATCPACodegen(
     cl::init(false));
 
 /// Value type used for condition codes.
-static const MVT MVT_CC = MVT::i32;
+constexpr MVT CondCodeVT = MVT::i32;
 
 /// Value type used for NZCV flags.
-static constexpr MVT FlagsVT = MVT::i32;
+constexpr MVT FlagsVT = MVT::i32;
 
 static const MCPhysReg GPRArgRegs[] = {AArch64::X0, AArch64::X1, AArch64::X2,
                                        AArch64::X3, AArch64::X4, AArch64::X5,
@@ -3472,6 +3472,12 @@ static void changeVectorFPCCToAArch64CC(ISD::CondCode CC,
   }
 }
 
+/// Like SelectionDAG::getCondCode(), but for AArch64 condition codes.
+static SDValue getCondCode(SelectionDAG &DAG, AArch64CC::CondCode CC) {
+  // TODO: Should be TargetConstant (need to s/imm/timm in patterns).
+  return DAG.getConstant(CC, SDLoc(), CondCodeVT);
+}
+
 static bool isLegalArithImmed(uint64_t C) {
   // Matches AArch64DAGToDAGISel::SelectArithImmed().
   bool IsLegal = (C >> 12 == 0) || ((C & 0xFFFULL) == 0 && C >> 24 == 0);
@@ -3678,7 +3684,7 @@ static SDValue emitConditionalComparison(SDValue LHS, SDValue RHS,
   if (Opcode == 0)
     Opcode = AArch64ISD::CCMP;
 
-  SDValue Condition = DAG.getConstant(Predicate, DL, MVT_CC);
+  SDValue Condition = getCondCode(DAG, Predicate);
   AArch64CC::CondCode InvOutCC = AArch64CC::getInvertedCondCode(OutCC);
   unsigned NZCV = AArch64CC::getNZCVToSatisfyCondCode(InvOutCC);
   SDValue NZCVOp = DAG.getConstant(NZCV, DL, MVT::i32);
@@ -4075,7 +4081,7 @@ static SDValue getAArch64Cmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
     Cmp = emitComparison(LHS, RHS, CC, DL, DAG);
     AArch64CC = changeIntCCToAArch64CC(CC);
   }
-  AArch64cc = DAG.getConstant(AArch64CC, DL, MVT_CC);
+  AArch64cc = getCondCode(DAG, AArch64CC);
   return Cmp;
 }
 
@@ -4195,7 +4201,7 @@ SDValue AArch64TargetLowering::LowerXOR(SDValue Op, SelectionDAG &DAG) const {
     AArch64CC::CondCode CC;
     SDValue Value, Overflow;
     std::tie(Value, Overflow) = getAArch64XALUOOp(CC, Sel.getValue(0), DAG);
-    SDValue CCVal = DAG.getConstant(getInvertedCondCode(CC), DL, MVT::i32);
+    SDValue CCVal = getCondCode(DAG, getInvertedCondCode(CC));
     return DAG.getNode(AArch64ISD::CSEL, DL, Op.getValueType(), TVal, FVal,
                        CCVal, Overflow);
   }
@@ -4274,8 +4280,8 @@ static SDValue carryFlagToValue(SDValue Glue, EVT VT, SelectionDAG &DAG,
   SDLoc DL(Glue);
   SDValue Zero = DAG.getConstant(0, DL, VT);
   SDValue One = DAG.getConstant(1, DL, VT);
-  unsigned Cond = Invert ? AArch64CC::LO : AArch64CC::HS;
-  SDValue CC = DAG.getConstant(Cond, DL, MVT::i32);
+  AArch64CC::CondCode Cond = Invert ? AArch64CC::LO : AArch64CC::HS;
+  SDValue CC = getCondCode(DAG, Cond);
   return DAG.getNode(AArch64ISD::CSEL, DL, VT, One, Zero, CC, Glue);
 }
 
@@ -4285,7 +4291,7 @@ static SDValue overflowFlagToValue(SDValue Glue, EVT VT, SelectionDAG &DAG) {
   SDLoc DL(Glue);
   SDValue Zero = DAG.getConstant(0, DL, VT);
   SDValue One = DAG.getConstant(1, DL, VT);
-  SDValue CC = DAG.getConstant(AArch64CC::VS, DL, MVT::i32);
+  SDValue CC = getCondCode(DAG, AArch64CC::VS);
   return DAG.getNode(AArch64ISD::CSEL, DL, VT, One, Zero, CC, Glue);
 }
 
@@ -4334,7 +4340,7 @@ static SDValue LowerXALUO(SDValue Op, SelectionDAG &DAG) {
   // We use an inverted condition, because the conditional select is inverted
   // too. This will allow it to be selected to a single instruction:
   // CSINC Wd, WZR, WZR, invert(cond).
-  SDValue CCVal = DAG.getConstant(getInvertedCondCode(CC), DL, MVT::i32);
+  SDValue CCVal = getCondCode(DAG, getInvertedCondCode(CC));
   Overflow =
       DAG.getNode(AArch64ISD::CSEL, DL, MVT::i32, FVal, TVal, CCVal, Overflow);
 
@@ -7124,8 +7130,7 @@ SDValue AArch64TargetLowering::LowerABS(SDValue Op, SelectionDAG &DAG) const {
   SDValue Cmp = DAG.getNode(AArch64ISD::SUBS, DL, DAG.getVTList(VT, FlagsVT),
                             Op.getOperand(0), DAG.getConstant(0, DL, VT));
   return DAG.getNode(AArch64ISD::CSEL, DL, VT, Op.getOperand(0), Neg,
-                     DAG.getConstant(AArch64CC::PL, DL, MVT::i32),
-                     Cmp.getValue(1));
+                     getCondCode(DAG, AArch64CC::PL), Cmp.getValue(1));
 }
 
 static SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) {
@@ -7136,7 +7141,7 @@ static SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) {
   AArch64CC::CondCode CC;
   if (SDValue Cmp = emitConjunction(DAG, Cond, CC)) {
     SDLoc DL(Op);
-    SDValue CCVal = DAG.getConstant(CC, DL, MVT::i32);
+    SDValue CCVal = getCondCode(DAG, CC);
     return DAG.getNode(AArch64ISD::BRCOND, DL, MVT::Other, Chain, Dest, CCVal,
                        Cmp);
   }
@@ -10575,7 +10580,7 @@ SDValue AArch64TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const {
 
     if (CC == ISD::SETNE)
       OFCC = getInvertedCondCode(OFCC);
-    SDValue CCVal = DAG.getConstant(OFCC, DL, MVT::i32);
+    SDValue CCVal = getCondCode(DAG, OFCC);
 
     return DAG.getNode(AArch64ISD::BRCOND, DL, MVT::Other, Chain, Dest, CCVal,
                        Overflow);
@@ -10648,7 +10653,7 @@ SDValue AArch64TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const {
         AArch64CC::isValidCBCond(changeIntCCToAArch64CC(CC)) &&
         ProduceNonFlagSettingCondBr) {
       SDValue Cond =
-          DAG.getTargetConstant(changeIntCCToAArch64CC(CC), DL, MVT::i32);
+          DAG.getTargetConstant(changeIntCCToAArch64CC(CC), DL, CondCodeVT);
       return DAG.getNode(AArch64ISD::CB, DL, MVT::Other, Chain, Cond, LHS, RHS,
                          Dest);
     }
@@ -10667,11 +10672,11 @@ SDValue AArch64TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const {
   SDValue Cmp = emitComparison(LHS, RHS, CC, DL, DAG);
   AArch64CC::CondCode CC1, CC2;
   changeFPCCToAArch64CC(CC, CC1, CC2);
-  SDValue CC1Val = DAG.getConstant(CC1, DL, MVT::i32);
+  SDValue CC1Val = getCondCode(DAG, CC1);
   SDValue BR1 =
       DAG.getNode(AArch64ISD::BRCOND, DL, MVT::Other, Chain, Dest, CC1Val, Cmp);
   if (CC2 != AArch64CC::AL) {
-    SDValue CC2Val = DAG.getConstant(CC2, DL, MVT::i32);
+    SDValue CC2Val = getCondCode(DAG, CC2);
     return DAG.getNode(AArch64ISD::BRCOND, DL, MVT::Other, BR1, Dest, CC2Val,
                        Cmp);
   }
@@ -11160,7 +11165,7 @@ SDValue AArch64TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
   if (CC2 == AArch64CC::AL) {
     changeFPCCToAArch64CC(ISD::getSetCCInverse(CC, LHS.getValueType()), CC1,
                           CC2);
-    SDValue CC1Val = DAG.getConstant(CC1, DL, MVT::i32);
+    SDValue CC1Val = getCondCode(DAG, CC1);
 
     // Note that we inverted the condition above, so we reverse the order of
     // the true and false operands here.  This will allow the setcc to be
@@ -11173,11 +11178,11 @@ SDValue AArch64TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
     // of the first as the RHS.  We're effectively OR'ing the two CC's together.
 
     // FIXME: It would be nice if we could match the two CSELs to two CSINCs.
-    SDValue CC1Val = DAG.getConstant(CC1, DL, MVT::i32);
+    SDValue CC1Val = getCondCode(DAG, CC1);
     SDValue CS1 =
         DAG.getNode(AArch64ISD::CSEL, DL, VT, TVal, FVal, CC1Val, Cmp);
 
-    SDValue CC2Val = DAG.getConstant(CC2, DL, MVT::i32);
+    SDValue CC2Val = getCondCode(DAG, CC2);
     Res = DAG.getNode(AArch64ISD::CSEL, DL, VT, TVal, CS1, CC2Val, Cmp);
   }
   return IsStrict ? DAG.getMergeValues({Res, Cmp.getValue(1)}, DL) : Res;
@@ -11205,8 +11210,7 @@ SDValue AArch64TargetLowering::LowerSETCCCARRY(SDValue Op,
 
   ISD::CondCode Cond = cast<CondCodeSDNode>(Op.getOperand(3))->get();
   ISD::CondCode CondInv = ISD::getSetCCInverse(Cond, VT);
-  SDValue CCVal =
-      DAG.getConstant(changeIntCCToAArch64CC(CondInv), DL, MVT::i32);
+  SDValue CCVal = getCondCode(DAG, changeIntCCToAArch64CC(CondInv));
   // Inputs are swapped because the condition is inverted. This will allow
   // matching with a single CSINC instruction.
   return DAG.getNode(AArch64ISD::CSEL, DL, OpVT, FVal, TVal, CCVal,
@@ -11577,13 +11581,13 @@ SDValue AArch64TargetLowering::LowerSELECT_CC(
   }
 
   // Emit first, and possibly only, CSEL.
-  SDValue CC1Val = DAG.getConstant(CC1, DL, MVT::i32);
+  SDValue CC1Val = getCondCode(DAG, CC1);
   SDValue CS1 = DAG.getNode(AArch64ISD::CSEL, DL, VT, TVal, FVal, CC1Val, Cmp);
 
   // If we need a second CSEL, emit it, using the output of the first as the
   // RHS.  We're effectively OR'ing the two CC's together.
   if (CC2 != AArch64CC::AL) {
-    SDValue CC2Val = DAG.getConstant(CC2, DL, MVT::i32);
+    SDValue CC2Val = getCondCode(DAG, CC2);
     return DAG.getNode(AArch64ISD::CSEL, DL, VT, TVal, CS1, CC2Val, Cmp);
   }
 
@@ -11685,7 +11689,7 @@ SDValue AArch64TargetLowering::LowerSELECT(SDValue Op,
     AArch64CC::CondCode OFCC;
     SDValue Value, Overflow;
     std::tie(Value, Overflow) = getAArch64XALUOOp(OFCC, CCVal.getValue(0), DAG);
-    SDValue CCVal = DAG.getConstant(OFCC, DL, MVT::i32);
+    SDValue CCVal = getCondCode(DAG, OFCC);
 
     return DAG.getNode(AArch64ISD::CSEL, DL, Op.getValueType(), TVal, FVal,
                        CCVal, Overflow);
@@ -12525,10 +12529,10 @@ static AArch64CC::CondCode parseConstraintCode(llvm::StringRef Constraint) {
 /// WZR, invert(<cond>)'.
 static SDValue getSETCC(AArch64CC::CondCode CC, SDValue NZCV, const SDLoc &DL,
                         SelectionDAG &DAG) {
-  return DAG.getNode(
-      AArch64ISD::CSINC, DL, MVT::i32, DAG.getConstant(0, DL, MVT::i32),
-      DAG.getConstant(0, DL, MVT::i32),
-      DAG.getConstant(getInvertedCondCode(CC), DL, MVT::i32), NZCV);
+  return DAG.getNode(AArch64ISD::CSINC, DL, MVT::i32,
+                     DAG.getConstant(0, DL, MVT::i32),
+                     DAG.getConstant(0, DL, MVT::i32),
+                     getCondCode(DAG, getInvertedCondCode(CC)), NZCV);
 }
 
 // Lower @cc flag output via getSETCC.
@@ -18699,7 +18703,7 @@ AArch64TargetLowering::BuildSREMPow2(SDNode *N, const APInt &Divisor,
     Created.push_back(Cmp.getNode());
     Created.push_back(And.getNode());
   } else {
-    SDValue CCVal = DAG.getConstant(AArch64CC::MI, DL, MVT_CC);
+    SDValue CCVal = getCondCode(DAG, AArch64CC::MI);
     SDVTList VTs = DAG.getVTList(VT, FlagsVT);
 
     SDValue Negs = DAG.getNode(AArch64ISD::SUBS, DL, VTs, Zero, N0);
@@ -19571,11 +19575,11 @@ static SDValue performANDORCSELCombine(SDNode *N, SelectionDAG &DAG) {
 
   if (N->getOpcode() == ISD::AND) {
     AArch64CC::CondCode InvCC0 = AArch64CC::getInvertedCondCode(CC0);
-    Condition = DAG.getConstant(InvCC0, DL, MVT_CC);
+    Condition = getCondCode(DAG, InvCC0);
     NZCV = AArch64CC::getNZCVToSatisfyCondCode(CC1);
   } else {
     AArch64CC::CondCode InvCC1 = AArch64CC::getInvertedCondCode(CC1);
-    Condition = DAG.getConstant(CC0, DL, MVT_CC);
+    Condition = getCondCode(DAG, CC0);
     NZCV = AArch64CC::getNZCVToSatisfyCondCode(InvCC1);
   }
 
@@ -19596,8 +19600,7 @@ static SDValue performANDORCSELCombine(SDNode *N, SelectionDAG &DAG) {
                        Cmp1.getOperand(1), NZCVOp, Condition, Cmp0);
   }
   return DAG.getNode(AArch64ISD::CSEL, DL, VT, CSel0.getOperand(0),
-                     CSel0.getOperand(1), DAG.getConstant(CC1, DL, MVT::i32),
-                     CCmp);
+                     CSel0.getOperand(1), getCondCode(DAG, CC1), CCmp);
 }
 
 static SDValue performORCombine(SDNode *N, TargetLowering::DAGCombinerInfo &DCI,
@@ -19802,7 +19805,7 @@ static SDValue performANDSETCCCombine(SDNode *N,
       SDLoc DL(N);
       return DAG.getNode(AArch64ISD::CSINC, DL, VT, DAG.getConstant(0, DL, VT),
                          DAG.getConstant(0, DL, VT),
-                         DAG.getConstant(InvertedCC, DL, MVT::i32), Cmp);
+                         getCondCode(DAG, InvertedCC), Cmp);
     }
   }
   return SDValue();
@@ -20793,7 +20796,7 @@ static SDValue performAddCSelIntoCSinc(SDNode *N, SelectionDAG &DAG) {
          "Unexpected constant value");
 
   SDValue NewNode = DAG.getNode(ISD::ADD, DL, VT, RHS, SDValue(CTVal, 0));
-  SDValue CCVal = DAG.getConstant(AArch64CC, DL, MVT::i32);
+  SDValue CCVal = getCondCode(DAG, AArch64CC);
   SDValue Cmp = LHS.getOperand(3);
 
   return DAG.getNode(AArch64ISD::CSINC, DL, VT, NewNode, RHS, CCVal, Cmp);
@@ -20979,7 +20982,7 @@ static SDValue foldADCToCINC(SDNode *N, SelectionDAG &DAG) {
   SDLoc DL(N);
 
   // (CINC x cc cond) <=> (CSINC x x !cc cond)
-  SDValue CC = DAG.getConstant(AArch64CC::LO, DL, MVT::i32);
+  SDValue CC = getCondCode(DAG, AArch64CC::LO);
   return DAG.getNode(AArch64ISD::CSINC, DL, VT, LHS, LHS, CC, Cond);
 }
 
@@ -22052,7 +22055,7 @@ static SDValue getPTest(SelectionDAG &DAG, EVT VT, SDValue Pg, SDValue Op,
 
   // Convert CC to integer based on requested condition.
   // NOTE: Cond is inverted to promote CSEL's removal when it feeds a compare.
-  SDValue CC = DAG.getConstant(getInvertedCondCode(Cond), DL, MVT::i32);
+  SDValue CC = getCondCode(DAG, getInvertedCondCode(Cond));
   SDValue Res = DAG.getNode(AArch64ISD::CSEL, DL, OutVT, FVal, TVal, CC, Test);
   return DAG.getZExtOrTrunc(Res, DL, VT);
 }
@@ -25093,10 +25096,9 @@ static SDValue performBRCONDCombine(SDNode *N,
     auto CSelCC = getCSETCondCode(CSel);
     if (CSelCC) {
       SDLoc DL(N);
-      return DAG.getNode(
-          N->getOpcode(), DL, N->getVTList(), Chain, Dest,
-          DAG.getConstant(getInvertedCondCode(*CSelCC), DL, MVT::i32),
-          CSel.getOperand(3));
+      return DAG.getNode(N->getOpcode(), DL, N->getVTList(), Chain, Dest,
+                         getCondCode(DAG, getInvertedCondCode(*CSelCC)),
+                         CSel.getOperand(3));
     }
   }
 
@@ -25237,7 +25239,7 @@ static SDValue foldCSELOfCSEL(SDNode *Op, SelectionDAG &DAG) {
   SDLoc DL(Op);
   EVT VT = Op->getValueType(0);
 
-  SDValue CCValue = DAG.getConstant(CC, DL, MVT::i32);
+  SDValue CCValue = getCondCode(DAG, CC);
   return DAG.getNode(AArch64ISD::CSEL, DL, VT, L, R, CCValue, Cond);
 }
 
@@ -25314,8 +25316,7 @@ static SDValue reassociateCSELOperandsForCSE(SDNode *N, SelectionDAG &DAG) {
     SDValue TValReassoc = Reassociate(TReassocOp, 0);
     SDValue FValReassoc = Reassociate(FReassocOp, 1);
     return DAG.getNode(AArch64ISD::CSEL, SDLoc(N), VT, TValReassoc, FValReassoc,
-                       DAG.getConstant(NewCC, SDLoc(N->getOperand(2)), MVT_CC),
-                       NewCmp.getValue(1));
+                       getCondCode(DAG, NewCC), NewCmp.getValue(1));
   };
 
   auto CC = static_cast<AArch64CC::CondCode>(N->getConstantOperandVal(2));
@@ -25456,8 +25457,7 @@ static SDValue performCSELCombine(SDNode *N,
       SDValue Sub = DAG.getNode(AArch64ISD::SUBS, DL, Cond->getVTList(),
                                 Cond.getOperand(1), Cond.getOperand(0));
       return DAG.getNode(AArch64ISD::CSEL, DL, N->getVTList(), N->getOperand(0),
-                         N->getOperand(1),
-                         DAG.getConstant(NewCond, DL, MVT::i32),
+                         N->getOperand(1), getCondCode(DAG, NewCond),
                          Sub.getValue(1));
     }
   }
@@ -25557,10 +25557,9 @@ static SDValue performSETCCCombine(SDNode *N,
     auto NewCond = getInvertedCondCode(OldCond);
 
     // csel 0, 1, !cond, X
-    SDValue CSEL =
-        DAG.getNode(AArch64ISD::CSEL, DL, LHS.getValueType(), LHS.getOperand(0),
-                    LHS.getOperand(1), DAG.getConstant(NewCond, DL, MVT::i32),
-                    LHS.getOperand(3));
+    SDValue CSEL = DAG.getNode(AArch64ISD::CSEL, DL, LHS.getValueType(),
+                               LHS.getOperand(0), LHS.getOperand(1),
+                               getCondCode(DAG, NewCond), LHS.getOperand(3));
     return DAG.getZExtOrTrunc(CSEL, DL, VT);
   }
 
@@ -25630,8 +25629,7 @@ static SDValue performFlagSettingCombine(SDNode *N,
   // If the flag result isn't used, convert back to a generic opcode.
   if (!N->hasAnyUseOfValue(1)) {
     SDValue Res = DCI.DAG.getNode(GenericOpcode, DL, VT, N->ops());
-    return DCI.DAG.getMergeValues({Res, DCI.DAG.getConstant(0, DL, MVT::i32)},
-                                  DL);
+    return DCI.CombineTo(N, Res, SDValue(N, 1));
   }
 
   // Combine identical generic nodes into this node, re-using the result.
@@ -27013,10 +27011,10 @@ static SDValue performRNDRCombine(SDNode *N, SelectionDAG &DAG) {
   SDValue A = DAG.getNode(
       AArch64ISD::MRS, DL, DAG.getVTList(MVT::i64, FlagsVT, MVT::Other),
       N->getOperand(0), DAG.getConstant(Register, DL, MVT::i32));
-  SDValue B = DAG.getNode(
-      AArch64ISD::CSINC, DL, MVT::i32, DAG.getConstant(0, DL, MVT::i32),
-      DAG.getConstant(0, DL, MVT::i32),
-      DAG.getConstant(AArch64CC::NE, DL, MVT::i32), A.getValue(1));
+  SDValue B = DAG.getNode(AArch64ISD::CSINC, DL, MVT::i32,
+                          DAG.getConstant(0, DL, MVT::i32),
+                          DAG.getConstant(0, DL, MVT::i32),
+                          getCondCode(DAG, AArch64CC::NE), A.getValue(1));
   return DAG.getMergeValues(
       {A, DAG.getZExtOrTrunc(B, DL, MVT::i1), A.getValue(2)}, DL);
 }