87     cl::desc("Spill mode for splitting live ranges"),
145     cl::desc("The threshold for splitting a virtual register with a hint, in "
593 //                              Region Splitting
800 /// when splitting the current live range into compact regions.  Compact
1021   // Sort out the new intervals created by splitting. We get four kinds:  in splitAroundRegion()
1024   // - Block-local splits are candidates for local splitting.  in splitAroundRegion()
1033     // Remainder interval. Don't try splitting again, spill if it doesn't  in splitAroundRegion()
1040     // Global intervals. Allow repeated splitting as long as the number of live  in splitAroundRegion()
1046         // Don't allow repeated splitting as a safe guard against looping.  in splitAroundRegion()
1057     MF->verify(this, "After splitting live range around region");  in splitAroundRegion()
1077     // splitting. Make sure we find a solution that is cheaper than spilling.  in tryRegionSplit()
1086   // No solutions found, fall back to single block splitting.  in tryRegionSplit()
1241   // Don't allow repeated splitting as a safe guard against looping.  in trySplitAroundHintReg()
1287 //                            Per-Block Splitting
1317   // Sort out the new intervals created by splitting. The remainder interval  in tryBlockSplit()
1326     MF->verify(this, "After splitting live range around basic blocks");  in tryBlockSplit()
1331 //                         Per-Instruction Splitting
1445   // Otherwise, splitting just inserts uncoalescable copies that do not help  in tryInstructionSplit()
1481 //                             Local Splitting
1643   // excessive splitting and infinite loops.  in tryLocalSplit()
1792 //                          Live Range Splitting
1807     NamedRegionTimer T("local_split", "Local Splitting", TimerGroupName,  in trySplit()
1816   NamedRegionTimer T("global_split", "Global Splitting", TimerGroupName,  in trySplit()
1822   // ranges already made dubious progress with region splitting, so they go  in trySplit()
1823   // straight to single block splitting.  in trySplit()
2116     // When splitting happens, the live-range may actually be empty.  in tryRecoloringCandidates()
2169 /// to be added to prologue|epilogue. Splitting a cold section of the live
2190     // We choose pre-splitting over using the CSR for the first time if  in tryAssignCSRFirstTime()
2191     // the cost of splitting is lower than CSRCost.  in tryAssignCSRFirstTime()
2201     // Perform the actual pre-splitting.  in tryAssignCSRFirstTime()
2428         // pre-splitting.  in selectOrSplitImpl()
2472     // Try splitting VirtReg or interferences.  in selectOrSplitImpl()
2491     // the live range splitting done by spilling correctly.  in selectOrSplitImpl()