The order of store chains needs to consider the size of the values

Author: tcwzxx

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -19125,6 +19125,14 @@ bool SLPVectorizerPass::vectorizeStoreChains(BoUpSLP &R) {
     if (V->getPointerOperandType()->getTypeID() >
         V2->getPointerOperandType()->getTypeID())
       return false;
+    if (V->getValueOperand()->getType()->getScalarSizeInBits() <
+        V2->getValueOperand()->getType()->getScalarSizeInBits()) {
+      return true;
+    }
+    if (V->getValueOperand()->getType()->getScalarSizeInBits() >
+        V2->getValueOperand()->getType()->getScalarSizeInBits()) {
+      return false;
+    }
     // UndefValues are compatible with all other values.
     if (isa<UndefValue>(V->getValueOperand()) ||
         isa<UndefValue>(V2->getValueOperand()))