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path: root/lib/CodeGen/LiveIntervalAnalysis.cpp
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* Replacing HUGE_VALF with llvm::huge_valf in order to work around a warning ↵Aaron Ballman2013-11-13
| | | | | | | | triggered in MSVC 12. Patch reviewed by Reid Kleckner and Jim Grosbach. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194533 91177308-0d34-0410-b5e6-96231b3b80d8
* Print register in LiveInterval::print()Matthias Braun2013-10-10
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192398 91177308-0d34-0410-b5e6-96231b3b80d8
* Represent RegUnit liveness with LiveRange instanceMatthias Braun2013-10-10
| | | | | | | Previously LiveInterval has been used, but having a spill weight and register number is unnecessary for a register unit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192397 91177308-0d34-0410-b5e6-96231b3b80d8
* Work on LiveRange instead of LiveInterval where possibleMatthias Braun2013-10-10
| | | | | | | Also change some pointer arguments to references at some places where 0-pointers are not allowed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192396 91177308-0d34-0410-b5e6-96231b3b80d8
* Pass LiveQueryResult by valueMatthias Braun2013-10-10
| | | | | | | This makes the API a bit more natural to use and makes it easier to make LiveRanges implementation details private. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192394 91177308-0d34-0410-b5e6-96231b3b80d8
* Refactor LiveInterval: introduce new LiveRange classMatthias Braun2013-10-10
| | | | | | | | | | LiveRange just manages a list of segments and a list of value numbers now as LiveInterval did previously, but without having details like spill weight or a fixed register number. LiveInterval is now a subclass of LiveRange and simply adds the spill weight and the register number. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192393 91177308-0d34-0410-b5e6-96231b3b80d8
* Rename LiveRange to LiveInterval::SegmentMatthias Braun2013-10-10
| | | | | | | | The Segment struct contains a single interval; multiple instances of this struct are used to construct a live range, but the struct is not a live range by itself. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192392 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix typoMatthias Braun2013-10-04
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191964 91177308-0d34-0410-b5e6-96231b3b80d8
* Auto-compute live intervals on demand.Mark Lacey2013-08-14
| | | | | | | | | | | | | | | When new virtual registers are created during splitting/spilling, defer creation of the live interval until we need to use the live interval. Along with the recent commits to notify LiveRangeEdit when new virtual registers are created, this makes it possible for functions like TargetInstrInfo::loadRegFromStackSlot() and TargetInstrInfo::storeRegToStackSlot() to create multiple virtual registers as part of the process of generating loads/stores for different register classes, and then have the live intervals for those new registers computed when they are needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188437 91177308-0d34-0410-b5e6-96231b3b80d8
* Improve misleading comment.Jakob Stoklund Olesen2013-08-14
| | | | | | Patch by Matthias Braun! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188391 91177308-0d34-0410-b5e6-96231b3b80d8
* Added -precompute-phys-liveness for testing LiveIntervals updates.Andrew Trick2013-06-21
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184573 91177308-0d34-0410-b5e6-96231b3b80d8
* Switch spill weights from a basic loop depth estimation to BlockFrequencyInfo.Benjamin Kramer2013-06-17
| | | | | | | | | | | | | | | | | | The main advantages here are way better heuristics, taking into account not just loop depth but also __builtin_expect and other static heuristics and will eventually learn how to use profile info. Most of the work in this patch is pushing the MachineBlockFrequencyInfo analysis into the right places. This is good for a 5% speedup on zlib's deflate (x86_64), there were some very unfortunate spilling decisions in its hottest loop in longest_match(). Other benchmarks I tried were mostly neutral. This changes register allocation in subtle ways, update the tests for it. 2012-02-20-MachineCPBug.ll was deleted as it's very fragile and the instruction it looked for was gone already (but the FileCheck pattern picked up unrelated stuff). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184105 91177308-0d34-0410-b5e6-96231b3b80d8
* Simplify logic now that r182490 is in place. No functional change intended.Chad Rosier2013-05-22
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182527 91177308-0d34-0410-b5e6-96231b3b80d8
* Rewrite the physreg part of findLastUseBefore().Jakob Stoklund Olesen2013-03-08
| | | | | | | | | To find the last use of a register unit, start from the bottom and scan upwards until a user is found. <rdar://problem/13353090> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176706 91177308-0d34-0410-b5e6-96231b3b80d8
* Make some fixes for LiveInterval repair with debug info. Debug valueCameron Zwarich2013-02-23
| | | | | | MachineInstrs don't have a slot index. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175961 91177308-0d34-0410-b5e6-96231b3b80d8
* Find anchoring end points for repairIntervalsInRange and repairIndexesInRangeCameron Zwarich2013-02-20
| | | | | | automatically. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175673 91177308-0d34-0410-b5e6-96231b3b80d8
* Make repairIntervalsInRange() more robust. There are now no longer any liveness-Cameron Zwarich2013-02-20
| | | | | | | | | related failures when running 'make check' without LiveVariables with the verifier enabled. Some of the remaining failures elsewhere may still be fallout from incorrect updating of LiveIntervals or the few missing cases left in the two-address pass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175672 91177308-0d34-0410-b5e6-96231b3b80d8
* Add support to the two-address pass for updating LiveIntervals in many of theCameron Zwarich2013-02-20
| | | | | | | common transformations. This includes updating repairIntervalsInRange() to handle more cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175604 91177308-0d34-0410-b5e6-96231b3b80d8
* Add SlotIndexes::repairIndexesInRange(), which repairs SlotIndexes after addingCameron Zwarich2013-02-20
| | | | | | | | | | and removing instructions. The implementation seems more complicated than it needs to be, but I couldn't find something simpler that dealt with all of the corner cases. Also add a call to repairIndexesInRange() from repairIntervalsInRange(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175601 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove use of reverse iterators in repairIntervalsInRange(). While they wereCameron Zwarich2013-02-17
| | | | | | | arguably better than forward iterators for this use case, they are confusing and there are some implementation problems with reverse iterators and MI bundles. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175393 91177308-0d34-0410-b5e6-96231b3b80d8
* Use ArrayRef instead of a reference to a SmallVectorImpl.Cameron Zwarich2013-02-17
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175385 91177308-0d34-0410-b5e6-96231b3b80d8
* Add support for updating the LiveIntervals of registers used by 'exotic'Cameron Zwarich2013-02-17
| | | | | | | | | | | | terminators that actually have register uses when splitting critical edges. This commit also introduces a method repairIntervalsInRange() on LiveIntervals, which allows for repairing LiveIntervals in a small range after an arbitrary target hook modifies, inserts, and removes instructions. It's pretty limited right now, but I hope to extend it to support all of the things that are done by the convertToThreeAddress() target hooks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175382 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove the old liveness algorithm.Jakob Stoklund Olesen2013-02-09
| | | | | | This is part of the plan to delete LiveVariables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174783 91177308-0d34-0410-b5e6-96231b3b80d8
* Turn on -new-live-intervals by default.Jakob Stoklund Olesen2013-02-08
| | | | | | | | This uses a liveness algorithm that does not depend on data from the LiveVariables analysis, it is the first step towards removing LiveVariables completely. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174774 91177308-0d34-0410-b5e6-96231b3b80d8
* Move all of the header files which are involved in modelling the LLVM IRChandler Carruth2013-01-02
| | | | | | | | | | | | | | | | | | | | | into their new header subdirectory: include/llvm/IR. This matches the directory structure of lib, and begins to correct a long standing point of file layout clutter in LLVM. There are still more header files to move here, but I wanted to handle them in separate commits to make tracking what files make sense at each layer easier. The only really questionable files here are the target intrinsic tablegen files. But that's a battle I'd rather not fight today. I've updated both CMake and Makefile build systems (I think, and my tests think, but I may have missed something). I've also re-sorted the includes throughout the project. I'll be committing updates to Clang, DragonEgg, and Polly momentarily. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171366 91177308-0d34-0410-b5e6-96231b3b80d8
* Use the new script to sort the includes of every file under lib.Chandler Carruth2012-12-03
| | | | | | | | | | | | | | | | | Sooooo many of these had incorrect or strange main module includes. I have manually inspected all of these, and fixed the main module include to be the nearest plausible thing I could find. If you own or care about any of these source files, I encourage you to take some time and check that these edits were sensible. I can't have broken anything (I strictly added headers, and reordered them, never removed), but they may not be the headers you'd really like to identify as containing the API being implemented. Many forward declarations and missing includes were added to a header files to allow them to parse cleanly when included first. The main module rule does in fact have its merits. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169131 91177308-0d34-0410-b5e6-96231b3b80d8
* misched: Fix LiveInterval update to better handle DebugVal.Andrew Trick2012-12-01
| | | | | | | Assertion failed: (itr != mi2iMap.end() && "Instruction not found in maps.") rdar://12777252. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169070 91177308-0d34-0410-b5e6-96231b3b80d8
* Make the LiveRegMatrix analysis available to targets.Jakob Stoklund Olesen2012-11-28
| | | | | | | | | | | No functional change, just moved header files. Targets can inject custom passes between register allocation and rewriting. This makes it possible to tweak the register allocation before rewriting, using the full global interference checking available from LiveRegMatrix. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168806 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix assertions in updateRegMaskSlots().Jakob Stoklund Olesen2012-11-09
| | | | | | | | | The RegMaskSlots contains 'r' slots while NewIdx and OldIdx are 'B' slots. This broke the checks in the assertions. This fixes PR14302. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167625 91177308-0d34-0410-b5e6-96231b3b80d8
* misched: Added handleMove support for updating all kill flags, not just for ↵Andrew Trick2012-10-16
| | | | | | | | | allocatable regs. This is a medium term workaround until we have a more robust solution in the form of a register liveness utility for postRA passes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166001 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove LIS::isAllocatable() and isReserved() helpers.Jakob Stoklund Olesen2012-10-15
| | | | | | All callers can simply use the corresponding MRI functions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165985 91177308-0d34-0410-b5e6-96231b3b80d8
* Allow for loops in LiveIntervals::pruneValue().Jakob Stoklund Olesen2012-10-13
| | | | | | | | | | | | | | It is possible that the live range of the value being pruned loops back into the kill MBB where the search started. When that happens, make sure that the beginning of KillMBB is also pruned. Instead of starting a DFS at KillMBB and skipping the root of the search, start a DFS at each KillMBB successor, and allow the search to loop back to KillMBB. This fixes PR14078. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165872 91177308-0d34-0410-b5e6-96231b3b80d8
* Use a transposed algorithm for handleMove().Jakob Stoklund Olesen2012-10-12
| | | | | | | | | | | | | Completely update one interval at a time instead of collecting live range fragments to be updated. This avoids building data structures, except for a single SmallPtrSet of updated intervals. Also share code between handleMove() and handleMoveIntoBundle(). Add support for moving dead defs across other live values in the interval. The MI scheduler can do that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165824 91177308-0d34-0410-b5e6-96231b3b80d8
* Handle reserved registers more accurately in handleMove().Jakob Stoklund Olesen2012-10-02
| | | | | | | | | | | | Reserved register live ranges look like a set of dead defs - any uses of reserved registers are ignored. Instead of skipping the updating of reserved register operands entirely, just ignore the use operands and treat the def operands normally. No test case, handleMove() is not commonly used yet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165060 91177308-0d34-0410-b5e6-96231b3b80d8
* Extend -new-coalescer SSA update to handle mapped values as well.Jakob Stoklund Olesen2012-09-20
| | | | | | | | | | | | | The old-fashioned many-to-one value mapping doesn't always work when merging vector lanes. A value can map to multiple different values, and it can even be necessary to insert new PHIs. When a value number is defined by a copy from a value number that required SSa update, include the live range of the copied value number in the SSA update as well. It is not necessarily a copy of the original value number any longer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164329 91177308-0d34-0410-b5e6-96231b3b80d8
* Merge into undefined lanes under -new-coalescer.Jakob Stoklund Olesen2012-09-17
| | | | | | | | | | | | | | | | | Add LIS::pruneValue() and extendToIndices(). These two functions are used by the register coalescer when merging two live ranges requires more than a trivial value mapping as supported by LiveInterval::join(). The pruneValue() function can remove the part of a value number that is going to conflict in join(). Afterwards, extendToIndices can restore the live range, using any new dominating value numbers and updating the SSA form. Use this complex value mapping to support merging a register into a vector lane that has a conflicting value, but the clobbered lane is undef. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164074 91177308-0d34-0410-b5e6-96231b3b80d8
* Make findLastUseBefore handle reg-unit liveness.Lang Hames2012-09-12
| | | | | | | | | | findLastUseBefore was previous considering virtreg liveness only, leading to incorrect live intervals for reg units when instrs with physreg operands were moved up. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163685 91177308-0d34-0410-b5e6-96231b3b80d8
* Release build: guard dump functions withManman Ren2012-09-11
| | | | | | | | | "#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)" No functional change. Update r163339. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163653 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove redundant semicolons which are null statements.Dmitri Gribenko2012-09-10
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163547 91177308-0d34-0410-b5e6-96231b3b80d8
* Release build: guard dump functions with "ifndef NDEBUG"Manman Ren2012-09-06
| | | | | | | No functional change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163339 91177308-0d34-0410-b5e6-96231b3b80d8
* Handle overlapping regunit intervals in LiveIntervals::addKillFlags().Jakob Stoklund Olesen2012-09-06
| | | | | | | | | | | | | | | | | | We will soon allow virtual register live ranges to overlap regunit live ranges when the physreg is defined as a copy of the virtreg: %EAX = COPY %vreg5 FOO %vreg5 BAR %EAX<kill> There is no real interference since %vreg5 and %EAX have the same value where they overlap. This patch prevents addKillFlags from adding virtreg kill flags to FOO where the assigned physreg is overlapping the virtual register live range. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163335 91177308-0d34-0410-b5e6-96231b3b80d8
* When updating live range endpoints, make sure to preserve the early clobber bit.Lang Hames2012-09-03
| | | | | | | | Fixs PR13719. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163107 91177308-0d34-0410-b5e6-96231b3b80d8
* Tidy up a few more uses of MF.getFunction()->getName().David Blaikie2012-08-22
| | | | | | | | Based on CR feedback from r162301 and Craig Topper's refactoring in r162347 here are a few other places that could use the same API (& in one instance drop a Function.h dependency). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162367 91177308-0d34-0410-b5e6-96231b3b80d8
* Add an experimental -early-live-intervals option.Jakob Stoklund Olesen2012-08-03
| | | | | | | | | | This option runs LiveIntervals before TwoAddressInstructionPass which will eventually learn to exploit and update the analysis. Eventually, LiveIntervals will run before PHIElimination, and we can get rid of LiveVariables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161270 91177308-0d34-0410-b5e6-96231b3b80d8
* Completely eliminate VNInfo flags.Jakob Stoklund Olesen2012-08-03
| | | | | | | | The 'unused' state of a value number can be represented as an invalid def SlotIndex. This also exposed code that shouldn't have been looking at unused value VNInfos. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161258 91177308-0d34-0410-b5e6-96231b3b80d8
* Eliminate the VNInfo::hasPHIKill() flag.Jakob Stoklund Olesen2012-08-03
| | | | | | | | | | The only real user of the flag was removeCopyByCommutingDef(), and it has been switched to LiveIntervals::hasPHIKill(). All the code changed by this patch was only concerned with computing and propagating the flag. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161255 91177308-0d34-0410-b5e6-96231b3b80d8
* Make the hasPHIKills flag a computed property.Jakob Stoklund Olesen2012-08-03
| | | | | | | | | | | | | The VNInfo::HAS_PHI_KILL is only half supported. We precompute it in LiveIntervalAnalysis, but it isn't properly updated by live range splitting and functions like shrinkToUses(). It is only used in one place: RegisterCoalescer::removeCopyByCommutingDef(). This patch changes that function to use a new LiveIntervals::hasPHIKill() function that computes the flag for a given value number. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161254 91177308-0d34-0410-b5e6-96231b3b80d8
* Also compute register mask lists under -new-live-intervals.Jakob Stoklund Olesen2012-07-27
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160898 91177308-0d34-0410-b5e6-96231b3b80d8
* Eliminate the IS_PHI_DEF flag and VNInfo::setIsPHIDef().Jakob Stoklund Olesen2012-07-27
| | | | | | | | A value number is a PHI def if and only if it begins at a block boundary. This can be derived from the def slot, a separate flag is not necessary. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160893 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a -new-live-intervals experimental option.Jakob Stoklund Olesen2012-07-27
| | | | | | | | | This option replaces the existing live interval computation with one based on LiveRangeCalc.cpp. The new algorithm does not depend on LiveVariables, and it can be run at any time, before or after leaving SSA form. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160892 91177308-0d34-0410-b5e6-96231b3b80d8
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