[RISCV] Refactor performCONCAT_VECTORSCombine. NFC (#69068)

Instead of doing a forward pass for positive strides and a reverse pass
for
negative strides, we can just do one pass by negating the offset if the
pointers do happen to be in reverse order.

We can extend getPtrDiff later in #68726 to handle more constant offset
sequences.

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

@@ -13785,11 +13785,10 @@ static SDValue performCONCAT_VECTORSCombine(SDNode *N, SelectionDAG &DAG,
     return SDValue();
 
   EVT BaseLdVT = BaseLd->getValueType(0);
-  SDValue BasePtr = BaseLd->getBasePtr();
 
   // Go through the loads and check that they're strided
-  SmallVector<SDValue> Ptrs;
-  Ptrs.push_back(BasePtr);
+  SmallVector<LoadSDNode *> Lds;
+  Lds.push_back(BaseLd);
   Align Align = BaseLd->getAlign();
   for (SDValue Op : N->ops().drop_front()) {
     auto *Ld = dyn_cast<LoadSDNode>(Op);
@@ -13798,60 +13797,38 @@ static SDValue performCONCAT_VECTORSCombine(SDNode *N, SelectionDAG &DAG,
         Ld->getValueType(0) != BaseLdVT)
       return SDValue();
 
-    Ptrs.push_back(Ld->getBasePtr());
+    Lds.push_back(Ld);
 
     // The common alignment is the most restrictive (smallest) of all the loads
     Align = std::min(Align, Ld->getAlign());
   }
 
-  auto matchForwardStrided = [](ArrayRef<SDValue> Ptrs) {
-    SDValue Stride;
-    for (auto Idx : enumerate(Ptrs)) {
-      if (Idx.index() == 0)
-        continue;
-      SDValue Ptr = Idx.value();
-      // Check that each load's pointer is (add LastPtr, Stride)
-      if (Ptr.getOpcode() != ISD::ADD ||
-          Ptr.getOperand(0) != Ptrs[Idx.index()-1])
-        return SDValue();
-      SDValue Offset = Ptr.getOperand(1);
-      if (!Stride)
-        Stride = Offset;
-      else if (Offset != Stride)
-        return SDValue();
-    }
-    return Stride;
-  };
-  auto matchReverseStrided = [](ArrayRef<SDValue> Ptrs) {
-    SDValue Stride;
-    for (auto Idx : enumerate(Ptrs)) {
-      if (Idx.index() == Ptrs.size() - 1)
-        continue;
-      SDValue Ptr = Idx.value();
-      // Check that each load's pointer is (add NextPtr, Stride)
-      if (Ptr.getOpcode() != ISD::ADD ||
-          Ptr.getOperand(0) != Ptrs[Idx.index()+1])
-        return SDValue();
-      SDValue Offset = Ptr.getOperand(1);
-      if (!Stride)
-        Stride = Offset;
-      else if (Offset != Stride)
-        return SDValue();
-    }
-    return Stride;
+  using PtrDiff = std::pair<SDValue, bool>;
+  auto GetPtrDiff = [](LoadSDNode *Ld1,
+                       LoadSDNode *Ld2) -> std::optional<PtrDiff> {
+    SDValue P1 = Ld1->getBasePtr();
+    SDValue P2 = Ld2->getBasePtr();
+    if (P2.getOpcode() == ISD::ADD && P2.getOperand(0) == P1)
+      return {{P2.getOperand(1), false}};
+    if (P1.getOpcode() == ISD::ADD && P1.getOperand(0) == P2)
+      return {{P1.getOperand(1), true}};
+
+    return std::nullopt;
   };
 
-  bool Reversed = false;
-  SDValue Stride = matchForwardStrided(Ptrs);
-  if (!Stride) {
-    Stride = matchReverseStrided(Ptrs);
-    Reversed = true;
-    // TODO: At this point, we've successfully matched a generalized gather
-    // load.  Maybe we should emit that, and then move the specialized
-    // matchers above and below into a DAG combine?
-    if (!Stride)
+  // Get the distance between the first and second loads
+  auto BaseDiff = GetPtrDiff(Lds[0], Lds[1]);
+  if (!BaseDiff)
+    return SDValue();
+
+  // Check all the loads are the same distance apart
+  for (auto *It = Lds.begin() + 1; It != Lds.end() - 1; It++)
+    if (GetPtrDiff(*It, *std::next(It)) != BaseDiff)
       return SDValue();
-  }
+
+  // TODO: At this point, we've successfully matched a generalized gather
+  // load.  Maybe we should emit that, and then move the specialized
+  // matchers above and below into a DAG combine?
 
   // Get the widened scalar type, e.g. v4i8 -> i64
   unsigned WideScalarBitWidth =
@@ -13867,26 +13844,25 @@ static SDValue performCONCAT_VECTORSCombine(SDNode *N, SelectionDAG &DAG,
   if (!TLI.isLegalStridedLoadStore(WideVecVT, Align))
     return SDValue();
 
+  auto [Stride, MustNegateStride] = *BaseDiff;
+  if (MustNegateStride)
+    Stride = DAG.getNegative(Stride, DL, Stride.getValueType());
+
   SDVTList VTs = DAG.getVTList({WideVecVT, MVT::Other});
   SDValue IntID =
     DAG.getTargetConstant(Intrinsic::riscv_masked_strided_load, DL,
                           Subtarget.getXLenVT());
-  if (Reversed)
-    Stride = DAG.getNegative(Stride, DL, Stride->getValueType(0));
+
   SDValue AllOneMask =
     DAG.getSplat(WideVecVT.changeVectorElementType(MVT::i1), DL,
                  DAG.getConstant(1, DL, MVT::i1));
 
-  SDValue Ops[] = {BaseLd->getChain(),
-                   IntID,
-                   DAG.getUNDEF(WideVecVT),
-                   BasePtr,
-                   Stride,
-                   AllOneMask};
+  SDValue Ops[] = {BaseLd->getChain(),   IntID,  DAG.getUNDEF(WideVecVT),
+                   BaseLd->getBasePtr(), Stride, AllOneMask};
 
   uint64_t MemSize;
   if (auto *ConstStride = dyn_cast<ConstantSDNode>(Stride);
-      ConstStride && !Reversed && ConstStride->getSExtValue() >= 0)
+      ConstStride && ConstStride->getSExtValue() >= 0)
     // total size = (elsize * n) + (stride - elsize) * (n-1)
     //            = elsize + stride * (n-1)
     MemSize = WideScalarVT.getSizeInBits() +