50 #define DEBUG_TYPE "machine-cse"
68     "aggressive-machine-cse", cl::Hidden, cl::init(false),
69     cl::desc("Override the profitability heuristics for Machine CSE"));
194     // FIXME: We should trivially coalesce subregister copies to expose CSE  in INITIALIZE_PASS_DEPENDENCY()
196     // cse-add-with-overflow.ll). This can be done here as follows:  in INITIALIZE_PASS_DEPENDENCY()
388       // Don't attempt to CSE across such an instruction.  in PhysRegDefsReach()
450   // If CSReg is used at all uses of Reg, CSE should not increase register  in isProfitableToCSE()
476   // Heuristics #1: Don't CSE "cheap" computation if the def is not local or in  in isProfitableToCSE()
486   // of the redundant computation are copies, do not cse.  in isProfitableToCSE()
545       // Using trivial copy propagation to find more CSE opportunities.  in ProcessBlockCSE()
553         // Try again to see if CSE is possible.  in ProcessBlockCSE()
610     // Prevent CSE-ing non-local convergent instructions.  in ProcessBlockCSE()
612     // that non-local CSE is illegal. The following check extends the definition  in ProcessBlockCSE()
617     // CSE-ing the subset of `isConvergent` instructions which do fall into this  in ProcessBlockCSE()
621                            "different BBs, avoid CSE!\n");  in ProcessBlockCSE()
627     // Check if it's profitable to perform this CSE.  in ProcessBlockCSE()
654              "Do not CSE physical register defs!");  in ProcessBlockCSE()
657         LLVM_DEBUG(dbgs() << "*** Not profitable, avoid CSE!\n");  in ProcessBlockCSE()
662       // Don't perform CSE if the result of the new instruction cannot exist  in ProcessBlockCSE()
667             dbgs() << "*** Not the same register constraints, avoid CSE!\n");  in ProcessBlockCSE()
789   // Now perform CSE.  in PerformCSE()
802 // We use stronger checks for PRE candidate rather than for CSE ones to embrace
905 // anticipating that the next CSE step will eliminate this created redundancy.
906 // If CSE doesn't eliminate this, than created instruction will remain dead