181         // If the shift is nuw/nsw, then the high bits are not dead  in determineLiveOperandBits()
198         // If the shift is exact, then the low bits are not dead  in determineLiveOperandBits()
218         // If the shift is exact, then the low bits are not dead  in determineLiveOperandBits()
229     // other operand are dead (unless they're both zero, in which  in determineLiveOperandBits()
230     // case they can't both be dead, so just mark the LHS bits as  in determineLiveOperandBits()
231     // dead).  in determineLiveOperandBits()
242     // other operand are dead (unless they're both one, in which  in determineLiveOperandBits()
243     // case they can't both be dead, so just mark the LHS bits as  in determineLiveOperandBits()
244     // dead).  in determineLiveOperandBits()
329     // check isAlwaysLive on every instruction when searching for dead  in performAnalysis()
346       // If all bits of the output are dead, then all bits of the input  in performAnalysis()
347       // are also dead.  in performAnalysis()
358       // We also want to detect dead uses of arguments, but will only store  in performAnalysis()
372           // output are alive, all others are dead.  in performAnalysis()
449   // Uses by always-live instructions are never dead.  in isUseDead()
459   // is dead. These uses might not be explicitly present in the DeadUses map.  in isUseDead()