Transforms/InstCombine/InstCombineCompares.cpp

862   Constant *LoBound = 0, *HiBound = 0;
866     LoBound = Prod;
871       HiOverflow = AddWithOverflow(HiBound, LoBound, RangeSize, false);
877       LoBound = ConstantExpr::getNeg(SubOne(RangeSize));
880       LoBound = Prod;     // e.g.   X/5 op 3 --> [15, 20)
890         LoOverflow = AddWithOverflow(LoBound, HiBound, DivNeg, true) ? -1 : 0;
898       LoBound = AddOne(RangeSize);
909         LoOverflow = AddWithOverflow(LoBound, HiBound, RangeSize, true) ? -1:0;
911       LoBound = Prod;       // e.g. X/-5 op -3  --> [15, 20)
929                           ICmpInst::ICMP_UGE, X, LoBound);
933     return ReplaceInstUsesWith(ICI, InsertRangeTest(X, LoBound, HiBound,
940                           ICmpInst::ICMP_ULT, X, LoBound);
944     return ReplaceInstUsesWith(ICI, InsertRangeTest(X, LoBound, HiBound,
952     return new ICmpInst(Pred, X, LoBound);