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path: root/lib/CodeGen/RegAllocGreedy.cpp
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2013-04-12Replace uses of the deprecated std::auto_ptr with OwningPtr.Andy Gibbs
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179373 91177308-0d34-0410-b5e6-96231b3b80d8
2013-03-05Remove unused #includes.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176467 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-12Limit the search space in RAGreedy::tryEvict().Jakob Stoklund Olesen
When tryEvict() is looking for a cheaper register in the allocation order, skip the tail of too expensive registers when possible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172281 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-04Speed up the AllocationOrder class a bit.Jakob Stoklund Olesen
Allow the central functions to be inlined, and use the argumentless isHint() function when possible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169319 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-03Add VirtRegMap::hasKnownPreference().Jakob Stoklund Olesen
Virtual registers with a known preferred register are prioritized by RAGreedy. This function makes the condition explicit without depending on getRegAllocPref(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169179 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-03Use the new script to sort the includes of every file under lib.Chandler Carruth
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
2012-11-28Make the LiveRegMatrix analysis available to targets.Jakob Stoklund Olesen
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
2012-09-21Fix a significant recent(?) regression. StackSlotColoring no longer did anythingEvan Cheng
because LiveStackAnalysis was not preserved by VirtRegWriter. This caused big stack usage regression in some cases. rdar://12340383 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164408 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-12Fix a couple of Doxygen comment issues pointed out by -Wdocumentation.Dmitri Gribenko
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163721 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-22Tidy up a few more uses of MF.getFunction()->getName().David Blaikie
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
2012-08-22Add a getName function to MachineFunction. Use it in places that previously ↵Craig Topper
did getFunction()->getName(). Remove includes of Function.h that are no longer needed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162347 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-21Remove unnecessary cast that was also unnecessarily casting away constness.David Blaikie
Even looking at the revision history I couldn't quite piece together why this cast was ever written in the first place, but I assume it was because of some change in the inheritance, perhaps this function was reimplemented in a derived type & this caller was meant to get the base version (& it wasn't virtual)? git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162301 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-20Remove LiveIntervalUnions from RegAllocBase.Jakob Stoklund Olesen
They are living in LiveRegMatrix now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158868 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-20Convert RAGreedy to LiveRegMatrix interference checking.Jakob Stoklund Olesen
Stop depending on the LiveIntervalUnions in RegAllocBase, they are about to be removed. The changes are mostly replacing register alias iterators with regunit iterators, and querying LiveRegMatrix instrad of RegAllocBase. InterferenceCache is converted to work with per-regunit LiveIntervalUnions, and it checks fixed regunit interference separately, using the fixed live intervals provided by LiveIntervalAnalysis. The local splitting helper calcGapWeights() is also considering fixed regunit interference which is kept on the side now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158867 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-09Also compute MBB live-in lists in the new rewriter pass.Jakob Stoklund Olesen
This deduplicates some code from the optimizing register allocators, and it means that it is now possible to change the register allocators' solutions simply by editing the VirtRegMap between the register allocator pass and the rewriter. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158249 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-08Reintroduce VirtRegRewriter.Jakob Stoklund Olesen
OK, not really. We don't want to reintroduce the old rewriter hacks. This patch extracts virtual register rewriting as a separate pass that runs after the register allocator. This is possible now that CodeGen/Passes.cpp can configure the full optimizing register allocator pipeline. The rewriter pass uses register assignments in VirtRegMap to rewrite virtual registers to physical registers, and it inserts kill flags based on live intervals. These finalization steps are the same for the optimizing register allocators: RABasic, RAGreedy, and PBQP. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158244 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-06Round 2 of dead private variable removal.Benjamin Kramer
LLVM is now -Wunused-private-field clean except for - lib/MC/MCDisassembler/Disassembler.h. Not sure why it keeps all those unaccessible fields. - gtest. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158096 91177308-0d34-0410-b5e6-96231b3b80d8
2012-06-01Switch all register list clients to the new MC*Iterator interface.Jakob Stoklund Olesen
No functional change intended. Sorry for the churn. The iterator classes are supposed to help avoid giant commits like this one in the future. The TableGen-produced register lists are getting quite large, and it may be necessary to change the table representation. This makes it possible to do so without changing all clients (again). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157854 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-30Prioritize smaller register classes for urgent evictions.Jakob Stoklund Olesen
It helps compile exotic inline asm. In the test case, normal GR32 virtual registers use up eax-edx so the final GR32_ABCD live range has no registers left. Since all the live ranges were tiny, we had no way of prioritizing the smaller register class. This patch allows tiny unspillable live ranges to be evicted by tiny unspillable live ranges from a smaller register class. <rdar://problem/11542429> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157715 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-23Add a last resort tryInstructionSplit() to RAGreedy.Jakob Stoklund Olesen
Live ranges with a constrained register class may benefit from splitting around individual uses. It allows the remaining live range to use a larger register class where it may allocate. This is like spilling to a different register class. This is only attempted on constrained register classes. <rdar://problem/11438902> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157354 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-19Allow LiveRangeEdit to be created with a NULL parent.Jakob Stoklund Olesen
The dead code elimination with callbacks is still useful. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157100 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-02Moved LiveRangeEdit.h so that it can be called from other parts of the ↵Pete Cooper
backend, not just libCodeGen git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153906 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-02Allocate virtual registers in ascending order.Jakob Stoklund Olesen
This is just the fallback tie-breaker ordering, the main allocation order is still descending size. Patch by Shamil Kurmangaleev! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153904 91177308-0d34-0410-b5e6-96231b3b80d8
2012-04-02Refactored the LiveRangeEdit interface so that MachineFunction, ↵Pete Cooper
TargetInstrInfo, MachineRegisterInfo, LiveIntervals, and VirtRegMap are all passed into the constructor and stored as members instead of passed in to each method. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153903 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-04Use uint16_t to store register overlaps to reduce static data.Craig Topper
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152001 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-21Clear virtual registers after they are no longer referenced.Andrew Trick
Passes after RegAlloc should be able to rely on MRI->getNumVirtRegs() == 0. This makes sharing code for pre/postRA passes more robust. Now, to check if a pass is running before the RA pipeline begins, use MRI->isSSA(). To check if a pass is running after the RA pipeline ends, use !MRI->getNumVirtRegs(). PEI resets virtual regs when it's done scavenging. PTX will either have to provide its own PEI pass or assign physregs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151032 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-14Fix details in local live range splitting with regmasks.Jakob Stoklund Olesen
Perform all comparisons at instruction granularity, and make sure register masks on uses count in both gaps. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150530 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-11Handle register masks in local live range splitting.Jakob Stoklund Olesen
Again the goal is to produce identical assembly with register mask operands enabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150287 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-10Add register mask support to InterferenceCache.Jakob Stoklund Olesen
This makes global live range splitting behave identically with and without register mask operands. This is not necessarily the best way of using register masks for live range splitting. It would be more efficient to first split global live ranges around calls (i.e., register masks), and reserve the fine grained per-physreg interference guidance for global live ranges that do not cross calls. For now the goal is to produce identical assembly when enabling register masks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150259 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-10RegAlloc superpass: includes phi elimination, coalescing, and scheduling.Andrew Trick
Creates a configurable regalloc pipeline. Ensure specific llc options do what they say and nothing more: -reglloc=... has no effect other than selecting the allocator pass itself. This patch introduces a new umbrella flag, "-optimize-regalloc", to enable/disable the optimizing regalloc "superpass". This allows for example testing coalscing and scheduling under -O0 or vice-versa. When a CodeGen pass requires the MachineFunction to have a particular property, we need to explicitly define that property so it can be directly queried rather than naming a specific Pass. For example, to check for SSA, use MRI->isSSA, not addRequired<PHIElimination>. CodeGen transformation passes are never "required" as an analysis ProcessImplicitDefs does not require LiveVariables. We have a plan to massively simplify some of the early passes within the regalloc superpass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150226 91177308-0d34-0410-b5e6-96231b3b80d8
2012-02-09Add register mask support to RAGreedy.Jakob Stoklund Olesen
This only adds the interference checks required for correctness. We still need to take advantage of register masks for the interference driven live range splitting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150191 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-17Renamed MachineScheduler to ScheduleTopDownLive.Andrew Trick
Responding to code review. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148290 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-17Moving options declarations around.Andrew Trick
More short term hackery until we have a way to configure passes that work on LiveIntervals. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148289 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-13Added the MachineSchedulerPass skeleton.Andrew Trick
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148105 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-12Make SplitAnalysis::UseSlots private.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148031 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-11Make data structures private.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147979 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-13Stop tracking spill slot uses in VirtRegMap.Jakob Stoklund Olesen
Nobody cared, StackSlotColoring scans the instructions to find used stack slots. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144485 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-01Update split candidate correctly when interference cache is full.Jakob Stoklund Olesen
No test case, spotted by inspection. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143407 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-14Ignore the cloning of unknown registers.Jakob Stoklund Olesen
THe LRE_DidCloneVirtReg callback may be called with vitual registers that RAGreedy doesn't even know about yet. In that case, there are no data structures to update. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139702 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-12Remove the -compact-regions flag.Jakob Stoklund Olesen
It has been enabled by default for a while, it was only there to allow performance comparisons. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139501 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-12Add an interface for SplitKit complement spill modes.Jakob Stoklund Olesen
SplitKit always computes a complement live range to cover the places where the original live range was live, but no explicit region has been allocated. Currently, the complement live range is created to be as small as possible - it never overlaps any of the regions. This minimizes register pressure, but if the complement is going to be spilled anyway, that is not very important. The spiller will eliminate redundant spills, and hoist others by making the spill slot live range overlap some of the regions created by splitting. Stack slots are cheap. This patch adds the interface to enable spill modes in SplitKit. In spill mode, SplitKit will assume that the complement is going to spill, so it will allow it to overlap regions in order to avoid back-copies. By doing some of the spiller's work early, the complement live range becomes simpler. In some cases, it can become much simpler because no extra PHI-defs are required. This will speed up both splitting and spilling. This is only the interface to enable spill modes, no implementation yet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139500 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-19Make a bunch of symbols private.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138025 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-09Refer to the RegisterCoalescer pass by ID.Jakob Stoklund Olesen
A public interface is no longer needed since RegisterCoalescer is not an analysis any more. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137082 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-06Fix typo. Thanks, Andy!Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137023 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-05Reject RS_Spill ranges from local splitting as well.Jakob Stoklund Olesen
All new local ranges are marked as RS_New now, so there is no need to attempt splitting of RS_Spill ranges any more. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137002 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-05Only mark remainder intervals as RS_Spill after per-block splitting.Jakob Stoklund Olesen
The local ranges created get to stay in the RS_New stage, just like for local and region splitting. This gives tryLocalSplit a bit more freedom the first time it sees one of these new local ranges. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137001 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-05Remember to update LiveDebugVariables after per-block splitting.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136996 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-05Extract per-block splitting into its own method.Jakob Stoklund Olesen
No functional change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136994 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-05Also use shouldSplitSingleBlock() in the fallback splitting mode.Jakob Stoklund Olesen
Drop the use of SplitAnalysis::getMultiUseBlocks, there is no need to go through a SmallPtrSet any more. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136992 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-05Split around single instructions to enable register class inflation.Jakob Stoklund Olesen
Normally, we don't create a live range for a single instruction in a basic block, the spiller does that anyway. However, when splitting a live range that belongs to a proper register sub-class, inserting these extra COPY instructions completely remove the constraints from the remainder interval, and it may be allocated from the larger super-class. The spiller will mop up these small live ranges if we end up spilling anyway. It calls them snippets. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136989 91177308-0d34-0410-b5e6-96231b3b80d8
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