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* misched: Don't consider artificial edges weak edges.Andrew Trick2012-11-131-8/+4
| | | | | | | For now be more conservative in case other out-of-tree schedulers rely on the old behavior of artificial edges. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167808 91177308-0d34-0410-b5e6-96231b3b80d8
* misched: Infrastructure for weak DAG edges.Andrew Trick2012-11-121-20/+58
| | | | | | | | This adds support for weak DAG edges to the general scheduling infrastructure in preparation for MachineScheduler support for heuristics based on weak edges. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167738 91177308-0d34-0410-b5e6-96231b3b80d8
* Release build: guard dump functions withManman Ren2012-09-111-1/+1
| | | | | | | | | "#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
* Release build: guard dump functions with "ifndef NDEBUG"Manman Ren2012-09-061-0/+2
| | | | | | | No functional change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163339 91177308-0d34-0410-b5e6-96231b3b80d8
* sched: Avoid trivially redundant DAG edges. Take the one with higher latency.Andrew Trick2012-06-131-3/+20
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158379 91177308-0d34-0410-b5e6-96231b3b80d8
* misched preparation: clarify ScheduleDAG and ScheduleDAGInstrs roles.Andrew Trick2012-03-071-15/+7
| | | | | | | | | | | | | | | | | | | ScheduleDAG is responsible for the DAG: SUnits and SDeps. It provides target hooks for latency computation. ScheduleDAGInstrs extends ScheduleDAG and defines the current scheduling region in terms of MachineInstr iterators. It has access to the target's scheduling itinerary data. ScheduleDAGInstrs provides the logic for building the ScheduleDAG for the sequence of MachineInstrs in the current region. Target's can implement highly custom schedulers by extending this class. ScheduleDAGPostRATDList provides the driver and diagnostics for current postRA scheduling. It maintains a current Sequence of scheduled machine instructions and logic for splicing them into the block. During scheduling, it uses the ScheduleHazardRecognizer provided by the target. Specific changes: - Removed driver code from ScheduleDAG. clearDAG is the only interface needed. - Added enterRegion/exitRegion hooks to ScheduleDAGInstrs to delimit the scope of each scheduling region and associated DAG. They should be used to setup and cleanup any region-specific state in addition to the DAG itself. This is necessary because we reuse the same ScheduleDAG object for the entire function. The target may extend these hooks to do things at regions boundaries, like bundle terminators. The hooks are called even if we decide not to schedule the region. So all instructions in a block are "covered" by these calls. - Added ScheduleDAGInstrs::begin()/end() public API. - Moved Sequence into the driver layer, which is specific to the scheduling algorithm. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152208 91177308-0d34-0410-b5e6-96231b3b80d8
* misched preparation: modularize schedule printing.Andrew Trick2012-03-071-17/+0
| | | | | | ScheduleDAG will not refer to the scheduled instruction sequence. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152205 91177308-0d34-0410-b5e6-96231b3b80d8
* misched preparation: modularize schedule verification.Andrew Trick2012-03-071-9/+4
| | | | | | ScheduleDAG will not refer to the scheduled instruction sequence. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152204 91177308-0d34-0410-b5e6-96231b3b80d8
* Don't print out pointer values in SUnit::dump().Jakob Stoklund Olesen2012-02-171-5/+3
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150842 91177308-0d34-0410-b5e6-96231b3b80d8
* misched: Initial code for building an MI level scheduling DAGAndrew Trick2012-01-141-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148174 91177308-0d34-0410-b5e6-96231b3b80d8
* Unweaken vtables as per ↵David Blaikie2011-12-201-0/+2
| | | | | | http://llvm.org/docs/CodingStandards.html#ll_virtual_anch git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146960 91177308-0d34-0410-b5e6-96231b3b80d8
* Make a bunch of symbols private.Benjamin Kramer2011-08-191-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138025 91177308-0d34-0410-b5e6-96231b3b80d8
* Silence a bunch (but not all) "variable written but not read" warningsDuncan Sands2011-08-121-0/+1
| | | | | | | when building with assertions disabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137460 91177308-0d34-0410-b5e6-96231b3b80d8
* - Rename TargetInstrDesc, TargetOperandInfo to MCInstrDesc and MCOperandInfo andEvan Cheng2011-06-281-1/+1
| | | | | | | | | sink them into MC layer. - Added MCInstrInfo, which captures the tablegen generated static data. Chang TargetInstrInfo so it's based off MCInstrInfo. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134021 91177308-0d34-0410-b5e6-96231b3b80d8
* Added -stress-sched flag in the Asserts build.Andrew Trick2011-06-151-0/+12
| | | | | | | Added a test case for handling physreg aliases during pre-RA-sched. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133063 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix a ton of comment typos found by codespell. Patch byChris Lattner2011-04-151-2/+2
| | | | | | | | Luis Felipe Strano Moraes! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129558 91177308-0d34-0410-b5e6-96231b3b80d8
* Introducing a new method of tracking register pressure. We can'tAndrew Trick2011-02-041-2/+4
| | | | | | | | | | | | | | | | precisely track pressure on a selection DAG, but we can at least keep it balanced. This design accounts for various interesting aspects of selection DAGS: register and subregister copies, glued nodes, dead nodes, unused registers, etc. Added SUnit::NumRegDefsLeft and ScheduleDAGSDNodes::RegDefIter. Note: I disabled PrescheduleNodesWithMultipleUses when register pressure is enabled, based on no evidence other than I don't think it makes sense to have both enabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124853 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix a few cases where the scheduler is not checking for phys reg copies. The ↵Andrew Trick2010-12-241-1/+1
| | | | | | scheduling node may have a NULL DAG node, yuck. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122544 91177308-0d34-0410-b5e6-96231b3b80d8
* Various bits of framework needed for precise machine-level selectionAndrew Trick2010-12-241-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | DAG scheduling during isel. Most new functionality is currently guarded by -enable-sched-cycles and -enable-sched-hazard. Added InstrItineraryData::IssueWidth field, currently derived from ARM itineraries, but could be initialized differently on other targets. Added ScheduleHazardRecognizer::MaxLookAhead to indicate whether it is active, and if so how many cycles of state it holds. Added SchedulingPriorityQueue::HasReadyFilter to allowing gating entry into the scheduler's available queue. ScoreboardHazardRecognizer now accesses the ScheduleDAG in order to get information about it's SUnits, provides RecedeCycle for bottom-up scheduling, correctly computes scoreboard depth, tracks IssueCount, and considers potential stall cycles when checking for hazards. ScheduleDAGRRList now models machine cycles and hazards (under flags). It tracks MinAvailableCycle, drives the hazard recognizer and priority queue's ready filter, manages a new PendingQueue, properly accounts for stall cycles, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122541 91177308-0d34-0410-b5e6-96231b3b80d8
* reduce indentation, no functionality change.Chris Lattner2010-12-201-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122208 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove trailing whitespace, no functionality changes.John Mosby2010-06-301-19/+18
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107244 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove unused member variable.Zhongxing Xu2010-05-171-1/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103936 91177308-0d34-0410-b5e6-96231b3b80d8
* Delete an unused member variable.Dan Gohman2010-04-131-1/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101143 91177308-0d34-0410-b5e6-96231b3b80d8
* Change errs() to dbgs().David Greene2010-01-051-40/+40
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92585 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove some old experimental code that is no longer needed. Remove ↵David Goodwin2009-11-201-14/+6
| | | | | | additional, speculative scheduling pass as its cost did not translate into significant performance improvement. Minor tweaks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89471 91177308-0d34-0410-b5e6-96231b3b80d8
* Rename registers to break output dependencies in addition to anti-dependencies.David Goodwin2009-11-121-2/+8
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@87015 91177308-0d34-0410-b5e6-96231b3b80d8
* Do a scheduling pass ignoring anti-dependencies to identify candidate ↵David Goodwin2009-11-031-7/+9
| | | | | | registers that should be renamed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85939 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix integer overflow in instruction scheduling. This can happen if we haveReid Kleckner2009-09-301-4/+16
| | | | | | | | | | | basic blocks that are so long that their size overflows a short. Also assert that overflow does not happen in the future, as requested by Evan. This fixes PR4401. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83159 91177308-0d34-0410-b5e6-96231b3b80d8
* Convert DOUT to DEBUG(errs()...).Bill Wendling2009-08-221-3/+5
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79760 91177308-0d34-0410-b5e6-96231b3b80d8
* Add some debug output.David Goodwin2009-08-111-0/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78687 91177308-0d34-0410-b5e6-96231b3b80d8
* Move to raw_ostream.Daniel Dunbar2009-07-241-36/+37
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76963 91177308-0d34-0410-b5e6-96231b3b80d8
* When scheduling a block in parts, keep track of the overallDan Gohman2009-02-111-11/+6
| | | | | | | | | | | | instruction index across each part. Instruction indices are used to make live range queries, and live ranges can extend beyond scheduling region boundaries. Refactor the ScheduleDAGSDNodes class some more so that it doesn't have to worry about this additional information. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64288 91177308-0d34-0410-b5e6-96231b3b80d8
* Use iterators to iterate through the Preds array instead ofDan Gohman2009-02-111-2/+3
| | | | | | | | an index. This code is on the hot-path because the current way SDep edges are uniqued has quadratic complexity. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64262 91177308-0d34-0410-b5e6-96231b3b80d8
* Factor out more code for computing register live-range informationforDan Gohman2009-02-101-1/+4
| | | | | | | | | | | | scheduling, and generalize is so that preserves state across scheduling regions. This fixes incorrect live-range information around terminators and labels, which are effective region boundaries. In place of looking for terminators to anchor inter-block dependencies, introduce special entry and exit scheduling units for this purpose. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64254 91177308-0d34-0410-b5e6-96231b3b80d8
* Instead of adding dependence edges between terminator instructionsDan Gohman2009-01-161-1/+8
| | | | | | | | | | | | | | | and every other instruction in their blocks to keep the terminator instructions at the end, teach the post-RA scheduler how to operate on ranges of instructions, and exclude terminators from the range of instructions that get scheduled. Also, exclude mid-block labels, such as EH_LABEL instructions, and schedule code before them separately from code after them. This fixes problems with the post-RA scheduler moving code past EH_LABELs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62366 91177308-0d34-0410-b5e6-96231b3b80d8
* Generalize the HazardRecognizer interface so that it can be usedDan Gohman2009-01-151-0/+3
| | | | | | | | to support MachineInstr-based scheduling in addition to SDNode-based scheduling. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62284 91177308-0d34-0410-b5e6-96231b3b80d8
* Move a few containers out of ScheduleDAGInstrs::BuildSchedGraphDan Gohman2009-01-151-9/+13
| | | | | | | | | | | | and into the ScheduleDAGInstrs class, so that they don't get destructed and re-constructed for each block. This fixes a compile-time hot spot in the post-pass scheduler. To help facilitate this, tidy and do some minor reorganization in the scheduler constructor functions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62275 91177308-0d34-0410-b5e6-96231b3b80d8
* Avoid referring to edge D after the Succs or Preds arrays haveDan Gohman2009-01-131-3/+3
| | | | | | | | been modified, to avoid trouble in the (unlikely) scenario that D is a reference to an element in one of those arrays. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62173 91177308-0d34-0410-b5e6-96231b3b80d8
* Don't call setDepthDirty/setHeightDirty when adding an edgeDan Gohman2009-01-051-4/+8
| | | | | | | with latency 0, since it doesn't affect the depth or height. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61762 91177308-0d34-0410-b5e6-96231b3b80d8
* Minor code simplifications.Dan Gohman2008-12-231-6/+6
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61371 91177308-0d34-0410-b5e6-96231b3b80d8
* Optimize setDepthDirty and setHeightDirty a little, as they showedDan Gohman2008-12-221-10/+16
| | | | | | | up on a profile. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61344 91177308-0d34-0410-b5e6-96231b3b80d8
* Use SmallVector's pop_back_val.Dan Gohman2008-12-201-4/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61277 91177308-0d34-0410-b5e6-96231b3b80d8
* Use the correct Preds and Succs lists in setHeightDirty()Dan Gohman2008-12-201-4/+4
| | | | | | | and setDepthDirty(), respectively. This fixes PR3241. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61276 91177308-0d34-0410-b5e6-96231b3b80d8
* Use getDepth() and getHeight() instead of accessing theDan Gohman2008-12-171-2/+2
| | | | | | | | Depth and Height members directly, as they may not be current. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61121 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix some register-alias-related bugs in the post-RA scheduler livenessDan Gohman2008-12-161-114/+127
| | | | | | | | | | | | | | | computation code. Also, avoid adding output-depenency edges when both defs are dead, which frequently happens with EFLAGS defs. Compute Depth and Height lazily, and always in terms of edge latency values. For the schedulers that don't care about latency, edge latencies are set to 1. Eliminate Cycle and CycleBound, and LatencyPriorityQueue's Latencies array. These are all subsumed by the Depth and Height fields. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61073 91177308-0d34-0410-b5e6-96231b3b80d8
* Move addPred and removePred out-of-line.Dan Gohman2008-12-161-0/+61
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61067 91177308-0d34-0410-b5e6-96231b3b80d8
* Rewrite the SDep class, and simplify some of the related code.Dan Gohman2008-12-091-21/+30
| | | | | | | | | | | | | | | | | | The Cost field is removed. It was only being used in a very limited way, to indicate when the scheduler should attempt to protect a live register, and it isn't really needed to do that. If we ever want the scheduler to start inserting copies in non-prohibitive situations, we'll have to rethink some things anyway. A Latency field is added. Instead of giving each node a single fixed latency, each edge can have its own latency. This will eventually be used to model various micro-architecture properties more accurately. The PointerIntPair class and an internal union are now used, which reduce the overall size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60806 91177308-0d34-0410-b5e6-96231b3b80d8
* Whitespace cleanups.Dan Gohman2008-12-091-12/+14
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60769 91177308-0d34-0410-b5e6-96231b3b80d8
* Initial support for anti-dependence breaking. Currently this code does notDan Gohman2008-11-251-0/+201
| | | | | | | | | | introduce any new spilling; it just uses unused registers. Refactor the SUnit topological sort code out of the RRList scheduler and make use of it to help with the post-pass scheduler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59999 91177308-0d34-0410-b5e6-96231b3b80d8
* Rename SDep's isSpecial to isArtificial, to make this field a littleDan Gohman2008-11-211-2/+2
| | | | | | | less mysterious. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59782 91177308-0d34-0410-b5e6-96231b3b80d8
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