aboutsummaryrefslogtreecommitdiffstats
path: root/lib/CodeGen/LiveVariables.cpp
Commit message (Collapse)AuthorAgeFilesLines
* Teach LiveVariables to handle <undef> operands.Jakob Stoklund Olesen2012-06-231-3/+5
| | | | | | | | It's simple: Don't treat <undef> operands as uses, and don't assume a virtual register has a defining instruction unless a real use has been seen. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159061 91177308-0d34-0410-b5e6-96231b3b80d8
* Switch all register list clients to the new MC*Iterator interface.Jakob Stoklund Olesen2012-06-011-32/+29
| | | | | | | | | | | | | 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
* Fix typo.Lang Hames2012-04-011-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153846 91177308-0d34-0410-b5e6-96231b3b80d8
* Assert on SSA errors in LiveVariables.Jakob Stoklund Olesen2012-03-091-0/+1
| | | | | | All uses of a virtual register must be dominated by its def. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152449 91177308-0d34-0410-b5e6-96231b3b80d8
* Convert more GenRegisterInfo tables from unsigned to uint16_t to reduce ↵Craig Topper2012-03-051-17/+17
| | | | | | static data size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152016 91177308-0d34-0410-b5e6-96231b3b80d8
* RegAlloc superpass: includes phi elimination, coalescing, and scheduling.Andrew Trick2012-02-101-0/+8
| | | | | | | | | | | | | | | | 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
* whitespaceAndrew Trick2012-02-031-3/+3
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149671 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix an obvious typo.Evan Cheng2012-01-211-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148622 91177308-0d34-0410-b5e6-96231b3b80d8
* Handle register masks in LiveVariables.Jakob Stoklund Olesen2012-01-211-0/+30
| | | | | | | | | | | A register mask operand kills any live physreg that isn't preserved. Unlike an implicit-def operand, the clobbered physregs are never live afterwards. This means LiveVariables has to track a much smaller number of live physregs, and it should spend much less time in addRegisterDead(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148609 91177308-0d34-0410-b5e6-96231b3b80d8
* Delete an unused member variable.Jakob Stoklund Olesen2012-01-201-1/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148594 91177308-0d34-0410-b5e6-96231b3b80d8
* After r147827 and r147902, it's now possible for unallocatable registers to beEvan Cheng2012-01-141-6/+22
| | | | | | | | | | | | | | | | | | | | live across BBs before register allocation. This miscompiled 197.parser when a cmp + b are optimized to a cbnz instruction even though the CPSR def is live-in a successor. cbnz r6, LBB89_12 ... LBB89_12: ble LBB89_1 The fix consists of two parts. 1) Teach LiveVariables that some unallocatable registers might be liveouts so don't mark their last use as kill if they are. 2) ARM constantpool island pass shouldn't form cbz / cbnz if the conditional branch does not kill CPSR. rdar://10676853 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148168 91177308-0d34-0410-b5e6-96231b3b80d8
* Add bundle aware API for querying instruction properties and switch the codeEvan Cheng2011-12-071-2/+2
| | | | | | | | | | | | | | | generator to it. For non-bundle instructions, these behave exactly the same as the MC layer API. For properties like mayLoad / mayStore, look into the bundle and if any of the bundled instructions has the property it would return true. For properties like isPredicable, only return true if *all* of the bundled instructions have the property. For properties like canFoldAsLoad, isCompare, conservatively return false for bundles. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146026 91177308-0d34-0410-b5e6-96231b3b80d8
* First chunk of MachineInstr bundle support.Evan Cheng2011-12-061-1/+1
| | | | | | | | | | 1. Added opcode BUNDLE 2. Taught MachineInstr class to deal with bundled MIs 3. Changed MachineBasicBlock iterator to skip over bundled MIs; added an iterator to walk all the MIs 4. Taught MachineBasicBlock methods about bundled MIs git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145975 91177308-0d34-0410-b5e6-96231b3b80d8
* Silence a bunch (but not all) "variable written but not read" warningsDuncan Sands2011-08-121-1/+1
| | | | | | | when building with assertions disabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137460 91177308-0d34-0410-b5e6-96231b3b80d8
* Reduce vector reallocations.Benjamin Kramer2011-03-081-4/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127254 91177308-0d34-0410-b5e6-96231b3b80d8
* Use an IndexedMap for LiveVariables::VirtRegInfo.Jakob Stoklund Olesen2011-01-081-25/+10
| | | | | | | | Provide MRI::getNumVirtRegs() and TRI::index2VirtReg() functions to allow iteration over virtual registers without depending on the representation of virtual register numbers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123098 91177308-0d34-0410-b5e6-96231b3b80d8
* Begin adding static dependence information to passes, which will allow us toOwen Anderson2010-10-121-1/+4
| | | | | | | | | | perform initialization without static constructors AND without explicit initialization by the client. For the moment, passes are required to initialize both their (potential) dependencies and any passes they preserve. I hope to be able to relax the latter requirement in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116334 91177308-0d34-0410-b5e6-96231b3b80d8
* Now with fewer extraneous semicolons!Owen Anderson2010-10-071-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115996 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove unused functions.Jakob Stoklund Olesen2010-08-161-15/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111156 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix batch of converting RegisterPass<> to INTIALIZE_PASS().Owen Anderson2010-07-211-1/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109045 91177308-0d34-0410-b5e6-96231b3b80d8
* fix a -Wbool-conversions warning from clang.Chris Lattner2010-06-141-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105942 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix some liveout handling related to tail calls, see comments.Dale Johannesen2010-06-051-1/+6
| | | | | | | | | I don't think this ever resulted in problems on x86, but it would on ARM. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105509 91177308-0d34-0410-b5e6-96231b3b80d8
* Eliminate MachineBasicBlock::const_livein_iterator and makeDan Gohman2010-04-131-1/+1
| | | | | | | | | MachineBasicBlock::livein_iterator a const_iterator, because clients shouldn't ever be using the iterator interface to mutate the livein set. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101147 91177308-0d34-0410-b5e6-96231b3b80d8
* LiveVariables should clear kill / dead markers first. This allows us to ↵Evan Cheng2010-03-261-3/+7
| | | | | | remove a hack in the scheduler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99597 91177308-0d34-0410-b5e6-96231b3b80d8
* Better handling of dead super registers in LiveVariables. We used to do this:Jakob Stoklund Olesen2010-03-051-21/+21
| | | | | | | | | | | | | | | | | | | | | CALL ... %RAX<imp-def> ... [not using %RAX] %EAX = ..., %RAX<imp-use, kill> RET %EAX<imp-use,kill> Now we do this: CALL ... %RAX<imp-def, dead> ... [not using %RAX] %EAX = ... RET %EAX<imp-use,kill> By not artificially keeping %RAX alive, we lower register pressure a bit. The correct number of instructions for 2008-08-05-SpillerBug.ll is obviously 55, anybody can see that. Sheesh. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97838 91177308-0d34-0410-b5e6-96231b3b80d8
* Keep track of phi join registers explicitly in LiveVariables.Jakob Stoklund Olesen2010-02-231-0/+1
| | | | | | | | Previously, LiveIntervalAnalysis would infer phi joins by looking for multiply defined registers. That doesn't work if the phi join is implicitly defined in all but one of the predecessors. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96994 91177308-0d34-0410-b5e6-96231b3b80d8
* move target-independent opcodes out of TargetInstrInfoChris Lattner2010-02-091-5/+4
| | | | | | | | | | into TargetOpcodes.h. #include the new TargetOpcodes.h into MachineInstr. Add new inline accessors (like isPHI()) to MachineInstr, and start using them throughout the codebase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95687 91177308-0d34-0410-b5e6-96231b3b80d8
* Skip DEBUG_VALUE in some places where it was affecting codegen.Dale Johannesen2010-02-091-0/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95647 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove dead variable.Benjamin Kramer2010-01-071-7/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92919 91177308-0d34-0410-b5e6-96231b3b80d8
* Change errs() to dbgs().David Greene2010-01-041-6/+7
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92532 91177308-0d34-0410-b5e6-96231b3b80d8
* Move PHIElimination::isLiveOut method to LiveVariables.Jakob Stoklund Olesen2009-12-011-0/+45
| | | | | | | | We want LiveVariables clients to use methods rather than accessing the getVarInfo data structure directly. That way it will be possible to change the LiveVariables representation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90240 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix PR5614: parts of a physical register def may be killed the rest.Evan Cheng2009-12-011-1/+47
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90180 91177308-0d34-0410-b5e6-96231b3b80d8
* Be more clever about calculating live variables through new basic blocks.Jakob Stoklund Olesen2009-11-211-19/+29
| | | | | | | | | | | | When splitting a critical edge, the registers live through the edge are: - Used in a PHI instruction, or - Live out from the predecessor, and - Live in to the successor. This allows the coalescer to eliminate even more phi joins. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89530 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix PR5410: LiveVariables lost subreg def:Evan Cheng2009-11-131-1/+7
| | | | | | | | | | | | | | | D0<def,dead> = ... ... = S0<use, kill> S0<def> = ... ... D0<def> = The first D0 def is correctly marked dead, however, livevariables should have added an implicit def of S0 or we end up with a use without a def. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88690 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix liveness calculation when splitting critical edges during PHI elimination.Jakob Stoklund Olesen2009-11-111-20/+21
| | | | | | | | | | | | | | - Edges are split before any phis are eliminated, so the code is SSA. - Create a proper IR BasicBlock for the split edges. - LiveVariables::addNewBlock now has same syntax as MachineDominatorTree::addNewBlock. Algorithm calculates predecessor live-out set rather than successor live-in set. This feature still causes some miscompilations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86867 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach PHIElimination to split critical edges when -split-phi-edges is enabled.Jakob Stoklund Olesen2009-11-101-0/+40
| | | | | | | | Critical edges leading to a PHI node are split when the PHI source variable is live out from the predecessor block. This help the coalescer eliminate more PHI joins. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86725 91177308-0d34-0410-b5e6-96231b3b80d8
* When LiveVariables is adding implicit-def to model "partial dead", add the ↵Evan Cheng2009-10-141-1/+12
| | | | | | earlyclobber marker if the superreg def has it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84153 91177308-0d34-0410-b5e6-96231b3b80d8
* Clean up LiveVariables and change how it deals with partial updates and ↵Evan Cheng2009-09-241-198/+64
| | | | | | kills. This also eliminate the horrible check which scan forward to the end of the basic block. It should be faster and more accurate. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82676 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix PR5024. LiveVariables physical register defs should *commit* only after allEvan Cheng2009-09-231-32/+93
| | | | | | | | | of the defs are processed. Also fix a implicit_def propagation bug: a implicit_def of a physical register should be applied to uses of the sub-registers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82616 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix PR5024. LiveVariables::FindLastPartialDef should return a set of ↵Evan Cheng2009-09-221-6/+22
| | | | | | sub-registers that were defined by the last partial def, not just a single sub-register. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82535 91177308-0d34-0410-b5e6-96231b3b80d8
* remove the last uses of Config/alloca.hChris Lattner2009-08-231-1/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79873 91177308-0d34-0410-b5e6-96231b3b80d8
* remove various std::ostream version of printing methods fromChris Lattner2009-08-231-6/+6
| | | | | | | | | MachineInstr and MachineOperand. This required eliminating a bunch of stuff that was using DOUT, I hope that bill doesn't mind me stealing his fun. ;-) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79813 91177308-0d34-0410-b5e6-96231b3b80d8
* Reapply r77654 with a fix: MachineFunctionPass's getAnalysisUsageDan Gohman2009-07-311-0/+1
| | | | | | | | | shouldn't do AU.setPreservesCFG(), because even though CodeGen passes don't modify the LLVM IR CFG, they may modify the MachineFunction CFG, and passes like MachineLoop are registered with isCFGOnly set to true. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77691 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert r77654, it appears to be causing llvm-gcc bootstrap failures, and manyDaniel Dunbar2009-07-311-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | failures when building assorted projects with clang. --- Reverse-merging r77654 into '.': U include/llvm/CodeGen/Passes.h U include/llvm/CodeGen/MachineFunctionPass.h U include/llvm/CodeGen/MachineFunction.h U include/llvm/CodeGen/LazyLiveness.h U include/llvm/CodeGen/SelectionDAGISel.h D include/llvm/CodeGen/MachineFunctionAnalysis.h U include/llvm/Function.h U lib/Target/CellSPU/SPUISelDAGToDAG.cpp U lib/Target/PowerPC/PPCISelDAGToDAG.cpp U lib/CodeGen/LLVMTargetMachine.cpp U lib/CodeGen/MachineVerifier.cpp U lib/CodeGen/MachineFunction.cpp U lib/CodeGen/PrologEpilogInserter.cpp U lib/CodeGen/MachineLoopInfo.cpp U lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp D lib/CodeGen/MachineFunctionAnalysis.cpp D lib/CodeGen/MachineFunctionPass.cpp U lib/CodeGen/LiveVariables.cpp git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77661 91177308-0d34-0410-b5e6-96231b3b80d8
* Manage MachineFunctions with an analysis Pass instead of the AnnotableDan Gohman2009-07-311-0/+1
| | | | | | | | mechanism. To support this, make MachineFunctionPass a little more complete. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77654 91177308-0d34-0410-b5e6-96231b3b80d8
* Avoid adding a duplicate def. This fixes PR4478.Evan Cheng2009-07-061-2/+11
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74857 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix PR4419: handle defs of partial uses.Evan Cheng2009-06-201-7/+6
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73816 91177308-0d34-0410-b5e6-96231b3b80d8
* If there is a def of a super-register followed by a use of a sub-register, ↵Evan Cheng2009-06-031-14/+0
| | | | | | | | | | | | | | | do *not* add an implicit def of the sub-register. e.g. EAX = ..., AX<imp-def> ... = AX This creates a double-def. Apparently this used to be necessary but is no longer needed. Thanks to Anton for pointing this out. Anton, I cannot create a test case without your uncommitted ARM patches. Please check in a test case for me. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72755 91177308-0d34-0410-b5e6-96231b3b80d8
* LiveVariables::VarInfo contains an AliveBlocks BitVector, which has as manyJeffrey Yasskin2009-05-261-9/+8
| | | | | | | | | | | entries as there are basic blocks in the function. LiveVariables::getVarInfo creates a VarInfo struct for every register in the function, leading to quadratic space use. This patch changes the BitVector to a SparseBitVector, which doesn't help the worst-case memory use but does reduce the actual use in very long functions with short-lived variables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72426 91177308-0d34-0410-b5e6-96231b3b80d8
* Eliminate VarInfo::UsedBlocks.Evan Cheng2009-05-261-5/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72411 91177308-0d34-0410-b5e6-96231b3b80d8
generated by cgit v1.1 at 2025-03-30 03:00:59 +0000