[llvm] [SLP] SLP's copyable elements based upon Main/Alt operations. (PR #124242)

[Alexey Bataev via llvm-commits]

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@@ -1125,6 +1244,25 @@ static bool doesInTreeUserNeedToExtract(Value *Scalar, Instruction *UserInst,
   }
 }
 
+// Determine that the vector could be vectorized with copyable elements.
+static bool isCopyableOp(ArrayRef<Value *> VL, Value *Main, Value *Alt) {
+  if (any_of(VL, IsaPred<PoisonValue>) || Main == Alt ||
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alexey-bataev wrote:

Better to move `any_of(VL, IsaPred<PoisonValue>)` n the end of condition

https://github.com/llvm/llvm-project/pull/124242