995   Value *VB = Sub->user_back();  in ShouldBreakUpSubtract()
1944       while (Op->hasOneUse() && Op->user_back()->getOpcode() == Opcode &&  in EraseInst()
1946         Op = Op->user_back();  in EraseInst()
1981   Instruction *User = I->user_back();  in canonicalizeNegConstExpr()
2041          (isReassociableOp(I->user_back(), Instruction::Mul) ||  in OptimizeInst()
2042           isReassociableOp(I->user_back(), Instruction::Add)))) {  in OptimizeInst()
2090            !isReassociableOp(I->user_back(), Instruction::Mul))) {  in OptimizeInst()
2114            !isReassociableOp(I->user_back(), Instruction::FMul))) {  in OptimizeInst()
2136   if (BO->hasOneUse() && BO->user_back()->getOpcode() == Opcode) {  in OptimizeInst()
2140     if (BO->user_back() != BO)  in OptimizeInst()
2141       RedoInsts.insert(BO->user_back());  in OptimizeInst()
2148       cast<Instruction>(BO->user_back())->getOpcode() == Instruction::Sub)  in OptimizeInst()
2151       cast<Instruction>(BO->user_back())->getOpcode() == Instruction::FSub)  in OptimizeInst()
2203         cast<Instruction>(I->user_back())->getOpcode() == Instruction::Add &&  in ReassociateExpression()
2209                cast<Instruction>(I->user_back())->getOpcode() ==  in ReassociateExpression()