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

[Alexey Bataev via llvm-commits]

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@@ -2488,8 +2627,16 @@ class BoUpSLP {
           }
           bool IsInverseOperation = !isCommutative(cast<Instruction>(VL[Lane]));
           bool APO = (OpIdx == 0) ? false : IsInverseOperation;
-          OpsVec[OpIdx][Lane] = {cast<Instruction>(VL[Lane])->getOperand(OpIdx),
-                                 APO, false};
+          Instruction *Inst = cast<Instruction>(VL[Lane]);
+          if (Inst->getOpcode() != MainOp->getOpcode() &&
+              OpIdx > (Inst->getNumOperands() - 1)) {
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alexey-bataev wrote:

How OpIdx can be greater than number of operands?

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