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* Revert r132245, "Create two BlockInfo entries when a live range is ↵Jakob Stoklund Olesen2011-05-29
| | | | | | | | discontinuous through a block." This commit seems to have broken a darwin 9 tester. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132299 91177308-0d34-0410-b5e6-96231b3b80d8
* Create two BlockInfo entries when a live range is discontinuous through a block.Jakob Stoklund Olesen2011-05-28
| | | | | | | | | | | | | | | | | | | Delete the Kill and Def markers in BlockInfo. They are no longer necessary when BlockInfo describes a continuous live range. This only affects the relatively rare kind of basic block where a live range looks like this: |---x o---| Now live range splitting can pretend that it is looking at two blocks: |---x o---| This allows the code to be simplified a bit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132245 91177308-0d34-0410-b5e6-96231b3b80d8
* Add SplitAnalysis::getNumLiveBlocks().Jakob Stoklund Olesen2011-05-28
| | | | | | | | | | | It is important that this function returns the same number of live blocks as countLiveBlocks(CurLI) because live range splitting uses the number of live blocks to ensure it is making progress. This is in preparation of supporting duplicate UseBlock entries for basic blocks that have a virtual register live-in and live-out, but not live-though. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132244 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix PR9883. Make sure all caches are invalidated when a live range is repaired.Jakob Stoklund Olesen2011-05-10
| | | | | | | | The previous invalidation missed the alias interference caches. Also add a stats counter for the number of repaired ranges. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131133 91177308-0d34-0410-b5e6-96231b3b80d8
* Add some statistics to the splitting and spilling frameworks.Jakob Stoklund Olesen2011-05-05
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130931 91177308-0d34-0410-b5e6-96231b3b80d8
* Gracefully handle invalid live ranges. Fix PR9831.Jakob Stoklund Olesen2011-05-03
| | | | | | | | | | | | | | | | Register coalescing can sometimes create live ranges that end in the middle of a basic block without any killing instruction. When SplitKit detects this, it will repair the live range by shrinking it to its uses. Live range splitting also needs to know about this. When the range shrinks so much that it becomes allocatable, live range splitting fails because it can't find a good split point. It is paranoid about making progress, so an allocatable range is considered an error. The coalescer should really not be creating these bad live ranges. They appear when coalescing dead copies. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130787 91177308-0d34-0410-b5e6-96231b3b80d8
* Minimize the slot indexes spanned by register ranges created when splitting.Jakob Stoklund Olesen2011-05-02
| | | | | | | | | | | | | When an interfering live range ends at a dead slot index between two instructions, make sure that the inserted copy instruction gets a slot index after the dead ones. This makes it possible to avoid the interference. Ideally, there shouldn't be interference ending at a deleted instruction, but physical register coalescing can sometimes do that to sub-registers. This fixes PR9823. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130687 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a safe-guard against repeated splitting for some rare cases.Jakob Stoklund Olesen2011-04-26
| | | | | | | The number of blocks covered by a live range must be strictly decreasing when splitting, otherwise we can't allow repeated splitting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130249 91177308-0d34-0410-b5e6-96231b3b80d8
* Don't recycle loop variables.Matt Beaumont-Gay2011-04-21
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129928 91177308-0d34-0410-b5e6-96231b3b80d8
* Allow allocatable ranges from global live range splitting to be split again.Jakob Stoklund Olesen2011-04-21
| | | | | | | | | | | | | | | | | | | | | These intervals are allocatable immediately after splitting, but they may be evicted because of later splitting. This is rare, but when it happens they should be split again. The remainder intervals that cannot be allocated after splitting still move directly to spilling. SplitEditor::finish can optionally provide a mapping from new live intervals back to the original interval indexes returned by openIntv(). Each original interval index can map to multiple new intervals after connected components have been separated. Dead code elimination may also add existing intervals to the list. The reverse mapping allows the SplitEditor client to treat the new intervals differently depending on the split region they came from. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129925 91177308-0d34-0410-b5e6-96231b3b80d8
* Unbreak the MSVC 2010 build.Francois Pichet2011-04-16
| | | | | | For further information on this particular issue see: http://connect.microsoft.com/VisualStudio/feedback/details/520043/error-converting-from-null-to-a-pointer-type-in-std-pair git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129642 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach the SplitKit blitter to handle multiply defined values as well.Jakob Stoklund Olesen2011-04-15
| | | | | | | | | | | | | | The transferValues() function can now handle both singly and multiply defined values, as long as the resulting live range is known. Only rematerialized values have their live range recomputed by extendRange(). The updateSSA() function can now insert PHI values in bulk across multiple values in multiple target registers in one pass. The list of blocks received from transferValues() is in layout order which seems to work well for the iterative algorithm. Blocks from extendRange() are still in reverse BFS order, but this function is used so rarely now that it doesn't matter. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129580 91177308-0d34-0410-b5e6-96231b3b80d8
* Stop using dead function.Jakob Stoklund Olesen2011-04-13
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129442 91177308-0d34-0410-b5e6-96231b3b80d8
* Create new intervals for isolated blocks during region splitting.Jakob Stoklund Olesen2011-04-12
| | | | | | | | | This merges the behavior of splitSingleBlocks into splitAroundRegion, so the RS_Region and RS_Block register stages can be coalesced. That means the leftover intervals after region splitting go directly to spilling instead of a second pass of per-block splitting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129379 91177308-0d34-0410-b5e6-96231b3b80d8
* Add SplitKit API to query and select the current interval being worked on.Jakob Stoklund Olesen2011-04-12
| | | | | | This makes it possible to target multiple registers in one pass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129374 91177308-0d34-0410-b5e6-96231b3b80d8
* Build the Hopfield network incrementally when splitting global live ranges.Jakob Stoklund Olesen2011-04-09
| | | | | | | | | It is common for large live ranges to have few basic blocks with register uses and many live-through blocks without any uses. This approach grows the Hopfield network incrementally around the use blocks, completely avoiding checking interference for some through blocks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129188 91177308-0d34-0410-b5e6-96231b3b80d8
* Analyze blocks with uses separately from live-through blocks without uses.Jakob Stoklund Olesen2011-04-06
| | | | | | | | About 90% of the relevant blocks are live-through without uses, and the only information required about them is their number. This saves memory and enables later optimizations that need to look at only the use-blocks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128985 91177308-0d34-0410-b5e6-96231b3b80d8
* Sign errorJakob Stoklund Olesen2011-04-05
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128963 91177308-0d34-0410-b5e6-96231b3b80d8
* Don't crash when a value is defined after the last split point.Jakob Stoklund Olesen2011-04-05
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128962 91177308-0d34-0410-b5e6-96231b3b80d8
* Use std::unique instead of a SmallPtrSet to ensure unique instructions in ↵Jakob Stoklund Olesen2011-04-05
| | | | | | | | | | | UseSlots. This allows us to always keep the smaller slot for an instruction which is what we want when a register has early clobber defines. Drop the UsingInstrs set and the UsingBlocks map. They are no longer needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128886 91177308-0d34-0410-b5e6-96231b3b80d8
* Stop precomputing last split points, query the SplitAnalysis cache on demand.Jakob Stoklund Olesen2011-04-05
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128875 91177308-0d34-0410-b5e6-96231b3b80d8
* Cache the fairly expensive last split point computation and provide a fastJakob Stoklund Olesen2011-04-05
| | | | | | | | | inlined path for the common case. Most basic blocks don't contain a call that may throw, so the last split point os simply the first terminator. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128874 91177308-0d34-0410-b5e6-96231b3b80d8
* Stop caching basic block index ranges now that SlotIndexes can keep up.Jakob Stoklund Olesen2011-04-04
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128821 91177308-0d34-0410-b5e6-96231b3b80d8
* Recompute register class and hint for registers created during spilling.Jakob Stoklund Olesen2011-03-29
| | | | | | The spill weight is not recomputed for an unspillable register - it stays infinite. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128490 91177308-0d34-0410-b5e6-96231b3b80d8
* Handle the special case when all uses follow the last split point.Jakob Stoklund Olesen2011-03-29
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128450 91177308-0d34-0410-b5e6-96231b3b80d8
* Amend debug output.Jakob Stoklund Olesen2011-03-27
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128398 91177308-0d34-0410-b5e6-96231b3b80d8
* Process all dead defs after rematerializing during splitting.Jakob Stoklund Olesen2011-03-20
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127973 91177308-0d34-0410-b5e6-96231b3b80d8
* Be more accurate about the slot index reading a register when dealing with defsJakob Stoklund Olesen2011-03-18
| | | | | | | | and early clobbers. Assert when trying to find an undefined value. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127856 91177308-0d34-0410-b5e6-96231b3b80d8
* Dead code elimination may separate the live interval into multiple connected ↵Jakob Stoklund Olesen2011-03-17
| | | | | | | | | components. I have convinced myself that it can only happen when a phi value dies. When it happens, allocate new virtual registers for the components. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127827 91177308-0d34-0410-b5e6-96231b3b80d8
* Rewrite instructions as part of ConnectedVNInfoEqClasses::Distribute.Jakob Stoklund Olesen2011-03-17
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127779 91177308-0d34-0410-b5e6-96231b3b80d8
* Preserve both isPHIDef and isDefByCopy bits when copying parent values.Jakob Stoklund Olesen2011-03-15
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127697 91177308-0d34-0410-b5e6-96231b3b80d8
* Delete dead code after rematerializing.Jakob Stoklund Olesen2011-03-08
| | | | | | | | LiveRangeEdit::eliminateDeadDefs() will eventually be used by coalescing, splitting, and spilling for dead code elimination. It can delete chains of dead instructions as long as there are no dependency loops. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127287 91177308-0d34-0410-b5e6-96231b3b80d8
* Work around a coalescer bug.Jakob Stoklund Olesen2011-03-05
| | | | | | | | | | | | The coalescer can in very rare cases leave too large live intervals around after rematerializing cheap-as-a-move instructions. Linear scan doesn't really care, but live range splitting gets very confused when a live range is killed by a ghost instruction. I will fix this properly in the coalescer after 2.9 branches. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127096 91177308-0d34-0410-b5e6-96231b3b80d8
* Tweak debug output. No functional changes.Jakob Stoklund Olesen2011-03-04
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127006 91177308-0d34-0410-b5e6-96231b3b80d8
* Use an IndexedMap instead of a DenseMap for the live-out cache.Jakob Stoklund Olesen2011-03-04
| | | | | | | This speeds up updateSSA() so it only accounts for 5% of the live range splitting time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126972 91177308-0d34-0410-b5e6-96231b3b80d8
* Cache basic block bounds instead of asking SlotIndexes::getMBBRange all the ↵Jakob Stoklund Olesen2011-03-03
| | | | | | | | | time. This speeds up the greedy register allocator by 15%. DenseMap is not as fast as one might hope. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126921 91177308-0d34-0410-b5e6-96231b3b80d8
* Change the SplitEditor interface to a single instance can be shared for ↵Jakob Stoklund Olesen2011-03-03
| | | | | | multiple splits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126912 91177308-0d34-0410-b5e6-96231b3b80d8
* Only run the updateSSA loop when we have actually seen multiple values.Jakob Stoklund Olesen2011-03-03
| | | | | | When only a single value has been seen, new PHIDefs are never needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126911 91177308-0d34-0410-b5e6-96231b3b80d8
* Turn the Edit member into a pointer so it can change dynamically.Jakob Stoklund Olesen2011-03-02
| | | | | | No functional change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126898 91177308-0d34-0410-b5e6-96231b3b80d8
* Transfer simply defined values directly without recomputing liveness and SSA.Jakob Stoklund Olesen2011-03-02
| | | | | | | | Values that map to a single new value in a new interval after splitting don't need new PHIDefs, and if the parent value was never rematerialized the live range will be the same. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126894 91177308-0d34-0410-b5e6-96231b3b80d8
* Extract a method. No functional change.Jakob Stoklund Olesen2011-03-02
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126893 91177308-0d34-0410-b5e6-96231b3b80d8
* Move extendRange() into SplitEditor and delete the LiveRangeMap class.Jakob Stoklund Olesen2011-03-02
| | | | | | | | | Extract the updateSSA() method from the too long extendRange(). LiveOutCache can be shared among all the new intervals since there is at most one of the new ranges live out from each basic block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126818 91177308-0d34-0410-b5e6-96231b3b80d8
* Rename mapValue to extendRange because that is its function now.Jakob Stoklund Olesen2011-03-02
| | | | | | Simplify the signature - The return value and ParentVNI are no longer needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126809 91177308-0d34-0410-b5e6-96231b3b80d8
* Move LiveIntervalMap::extendTo into LiveInterval itself.Jakob Stoklund Olesen2011-03-02
| | | | | | | This method could probably be used by LiveIntervalAnalysis::shrinkToUses, and now it can use extendIntervalEndTo() which coalesces ranges. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126803 91177308-0d34-0410-b5e6-96231b3b80d8
* Delete dead code.Jakob Stoklund Olesen2011-03-01
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126801 91177308-0d34-0410-b5e6-96231b3b80d8
* Move the value map from LiveIntervalMap to SplitEditor.Jakob Stoklund Olesen2011-03-01
| | | | | | | | | | | The value map is currently not used, all values are 'complex mapped' and LiveIntervalMap::mapValue is used to dig them out. This is the first step in a series changes leading to the removal of LiveIntervalMap. Its data structures can be shared among all the live intervals created by a split, so it is wasteful to create a copy for each. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126800 91177308-0d34-0410-b5e6-96231b3b80d8
* Delete dead code.Jakob Stoklund Olesen2011-03-01
| | | | | | | Local live range splitting is better driven by interference. This code was just guessing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126799 91177308-0d34-0410-b5e6-96231b3b80d8
* It is safe to ignore LastSplitPoint when the variable is not live out.Jakob Stoklund Olesen2011-02-23
| | | | | | No code will be inserted after the split point anyway. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126319 91177308-0d34-0410-b5e6-96231b3b80d8
* Add SplitKit::isOriginalEndpoint and use it to force live range splitting to ↵Jakob Stoklund Olesen2011-02-21
| | | | | | | | | | | | | | terminate. An original endpoint is an instruction that killed or defined the original live range before any live ranges were split. When splitting global live ranges, avoid creating local live ranges without any original endpoints. We may still create global live ranges without original endpoints, but such a range won't be split again, and live range splitting still terminates. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126151 91177308-0d34-0410-b5e6-96231b3b80d8
* Give SplitAnalysis a VRM member to access VirtRegMap::getOriginal().Jakob Stoklund Olesen2011-02-19
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126005 91177308-0d34-0410-b5e6-96231b3b80d8
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