Make the logic for checking scatter vectorized nodes of GEP clearer (llvm#97826)

There is no functional change.

Authored-by: zhizhixu <[email protected]>

Author: tcwzxx

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -6725,9 +6725,9 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth,
   bool IsScatterVectorizeUserTE =
       UserTreeIdx.UserTE &&
       UserTreeIdx.UserTE->State == TreeEntry::ScatterVectorize;
-  bool AreAllSameInsts =
-      (S.getOpcode() && allSameBlock(VL)) ||
-      (S.OpValue->getType()->isPointerTy() && IsScatterVectorizeUserTE &&
+  bool AreAllSameBlock = S.getOpcode() && allSameBlock(VL);
+  bool AreScatterAllGEPSameBlock =
+      (IsScatterVectorizeUserTE && S.OpValue->getType()->isPointerTy() &&
        VL.size() > 2 &&
        all_of(VL,
               [&BB](Value *V) {
@@ -6741,6 +6741,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth,
        BB &&
        sortPtrAccesses(VL, UserTreeIdx.UserTE->getMainOp()->getType(), *DL, *SE,
                        SortedIndices));
+  bool AreAllSameInsts = AreAllSameBlock || AreScatterAllGEPSameBlock;
   if (!AreAllSameInsts || allConstant(VL) || isSplat(VL) ||
       (isa<InsertElementInst, ExtractValueInst, ExtractElementInst>(
            S.OpValue) &&
@@ -6820,9 +6821,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth,
 
   // Special processing for sorted pointers for ScatterVectorize node with
   // constant indeces only.
-  if (AreAllSameInsts && UserTreeIdx.UserTE &&
-      UserTreeIdx.UserTE->State == TreeEntry::ScatterVectorize &&
-      !(S.getOpcode() && allSameBlock(VL))) {
+  if (!AreAllSameBlock && AreScatterAllGEPSameBlock) {
     assert(S.OpValue->getType()->isPointerTy() &&
            count_if(VL, IsaPred<GetElementPtrInst>) >= 2 &&
            "Expected pointers only.");