Transforms/InstCombine/InstructionCombining.cpp

317 static bool simplifyAssocCastAssoc(BinaryOperator *BinOp1,
319   auto *Cast = dyn_cast<CastInst>(BinOp1->getOperand(0));
329   if (!BinOp1->isBitwiseLogicOp())
332   auto AssocOpcode = BinOp1->getOpcode();
338   if (!match(BinOp1->getOperand(1), m_Constant(C1)) ||
358   IC.replaceOperand(*BinOp1, 1, FoldedC);
359   BinOp1->dropPoisonGeneratingFlags();
834 //       BinOp1 is `and`
842 //    2) BinOp1 == BinOp2 (if BinOp ==  `add`, then also requires `shl`).
886     // If the BinOp1 is `and` we don't need to check the mask.
955     // If BinOp1 == BinOp2 and it's bitwise or shl with add, then just