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* More dead code elimination in VirtRegMap.Jakob Stoklund Olesen2011-11-131-12/+0
| | | | | | This thing is looking a lot like a virtual register map now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144486 91177308-0d34-0410-b5e6-96231b3b80d8
* Stop tracking spill slot uses in VirtRegMap.Jakob Stoklund Olesen2011-11-131-45/+0
| | | | | | | 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
* Remove dead code and data from VirtRegMap.Jakob Stoklund Olesen2011-11-131-61/+0
| | | | | | | Most of this stuff was supporting the old deferred spill code insertion mechanism. Modern spillers just edit machine code in place. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144484 91177308-0d34-0410-b5e6-96231b3b80d8
* Stop tracking unused registers in VirtRegMap.Jakob Stoklund Olesen2011-11-131-35/+0
| | | | | | | The information was only used by the register allocator in StackSlotColoring. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144482 91177308-0d34-0410-b5e6-96231b3b80d8
* Also add <imp-use,kill> flags for redefined super-registers.Jakob Stoklund Olesen2011-10-051-8/+18
| | | | | | | | | | | | | | | | | | | | | | | | For example: %vreg10:dsub_0<def,undef> = COPY %vreg1 %vreg10:dsub_1<def> = COPY %vreg2 is rewritten as: %D2<def> = COPY %D0, %Q1<imp-def> %D3<def> = COPY %D1, %Q1<imp-use,kill>, %Q1<imp-def> The first COPY doesn't care about the previous value of %Q1, so it doesn't read that register. The second COPY is a partial redefinition of %Q1, so it implicitly kills and redefines that register. This makes it possible to recognize instructions that can harmlessly clobber the full super-register. The write and don't read the super-register. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141139 91177308-0d34-0410-b5e6-96231b3b80d8
* VirtRegMap is counting spill slots, not register spills.Jakob Stoklund Olesen2011-09-151-3/+3
| | | | | | Fix the stats counters to reflect that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139819 91177308-0d34-0410-b5e6-96231b3b80d8
* Also count identity copies.Jakob Stoklund Olesen2011-05-061-0/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130996 91177308-0d34-0410-b5e6-96231b3b80d8
* Also add <imp-def> operands for defined and dead super-registers when rewriting.Jakob Stoklund Olesen2011-04-271-6/+15
| | | | | | | We cannot rely on the <imp-def> operands added by LiveIntervals in all cases as demonstrated by the test case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130313 91177308-0d34-0410-b5e6-96231b3b80d8
* Don't completely eliminate identity copies that also modify super register ↵Jakob Stoklund Olesen2011-03-311-6/+12
| | | | | | | | | liveness. Turn them into noop KILL instructions instead. This lets the scavenger know when super-registers are killed and defined. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128645 91177308-0d34-0410-b5e6-96231b3b80d8
* Dump the register map before rewriting.Jakob Stoklund Olesen2011-03-231-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128143 91177308-0d34-0410-b5e6-96231b3b80d8
* Add VirtRegMap::rewrite() and use it in the new register allocators.Jakob Stoklund Olesen2011-02-181-0/+71
| | | | | | | | | | The rewriter works almost identically to -rewriter=trivial, except it also eliminates any identity copies. This makes the new register allocators independent of VirtRegRewriter.cpp which will be going away at the same time as RegAllocLinearScan. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125967 91177308-0d34-0410-b5e6-96231b3b80d8
* Simplify a bunch of isVirtualRegister() and isPhysicalRegister() logic.Jakob Stoklund Olesen2011-01-101-3/+2
| | | | | | | | These functions not longer assert when passed 0, but simply return false instead. No functional change intended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123155 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove MachineRegisterInfo::getLastVirtReg(), it was giving wrong resultsJakob Stoklund Olesen2011-01-091-8/+8
| | | | | | | | | | | | | | | | | | when no virtual registers have been allocated. It was only used to resize IndexedMaps, so provide an IndexedMap::resize() method such that Map.grow(MRI.getLastVirtReg()); can be replaced with the simpler Map.resize(MRI.getNumVirtRegs()); This works correctly when no virtuals are allocated, and it bypasses the to/from index conversions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123130 91177308-0d34-0410-b5e6-96231b3b80d8
* Replace TargetRegisterInfo::printReg with a PrintReg class that also works ↵Jakob Stoklund Olesen2011-01-091-8/+4
| | | | | | | | | | without a TRI instance. Print virtual registers numbered from 0 instead of the arbitrary FirstVirtualRegister. The first virtual register is printed as %vreg0. TRI::NoRegister is printed as %noreg. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123107 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix VirtRegMap to use TRI::index2VirtReg and TRI::virtReg2Index instead ofJakob Stoklund Olesen2011-01-081-17/+25
| | | | | | | | depending on TRI::FirstVirtualRegister. Also use TRI::printReg instead of printing virtual registers directly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123101 91177308-0d34-0410-b5e6-96231b3b80d8
* Remember to resize SpillSlotToUsesMap when allocating an emergency spill slot.Jakob Stoklund Olesen2010-11-161-19/+16
| | | | | | | | | Use amazing new function call technology instead of writing identical code in multiple places. This fixes PR8604. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119306 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
* Fix batch of converting RegisterPass<> to INTIALIZE_PASS().Owen Anderson2010-07-211-2/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109045 91177308-0d34-0410-b5e6-96231b3b80d8
* Use the right floating point load/store instructions in ↵Jakob Stoklund Olesen2010-02-261-2/+4
| | | | | | | | | | | | | | | | | | PPCInstrInfo::foldMemoryOperandImpl(). The PowerPC floating point registers can represent both f32 and f64 via the two register classes F4RC and F8RC. F8RC is considered a subclass of F4RC to allow cross-class coalescing. This coalescing only affects whether registers are spilled as f32 or f64. Spill slots must be accessed with load/store instructions corresponding to the class of the spilled register. PPCInstrInfo::foldMemoryOperandImpl was looking at the instruction opcode which is wrong. X86 has similar floating point register classes, but doesn't try to fold memory operands, so there is no problem there. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97262 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix "the the" and similar typos.Dan Gohman2010-02-101-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95781 91177308-0d34-0410-b5e6-96231b3b80d8
* Change errs() to dbgs().David Greene2010-01-051-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92587 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a bool flag to StackObjects telling whether they reference spillDavid Greene2009-11-121-4/+4
| | | | | | | | | | | | | | slots. The AsmPrinter will use this information to determine whether to print a spill/reload comment. Remove default argument values. It's too easy to pass a wrong argument value when multiple arguments have default values. Make everything explicit to trap bugs early. Update all targets to adhere to the new interfaces.. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@87022 91177308-0d34-0410-b5e6-96231b3b80d8
* The Indexes Patch.Lang Hames2009-11-031-1/+1
| | | | | | | | | | | | | | | | | | This introduces a new pass, SlotIndexes, which is responsible for numbering instructions for register allocation (and other clients). SlotIndexes numbering is designed to match the existing scheme, so this patch should not cause any changes in the generated code. For consistency, and to avoid naming confusion, LiveIndex has been renamed SlotIndex. The processImplicitDefs method of the LiveIntervals analysis has been moved into its own pass so that it can be run prior to SlotIndexes. This was necessary to match the existing numbering scheme. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85979 91177308-0d34-0410-b5e6-96231b3b80d8
* Distinquish stack slots from other stack objects. They (and fixed objects) ↵Evan Cheng2009-10-171-2/+2
| | | | | | get FixedStack PseudoSourceValues. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84326 91177308-0d34-0410-b5e6-96231b3b80d8
* remove some uses of llvm/Support/Streams.hChris Lattner2009-08-231-6/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79842 91177308-0d34-0410-b5e6-96231b3b80d8
* Move more to raw_ostream, provide support for writing MachineBasicBlock,Daniel Dunbar2009-07-241-0/+6
| | | | | | | LiveInterval, etc to raw_ostream. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76965 91177308-0d34-0410-b5e6-96231b3b80d8
* Part 1.Evan Cheng2009-06-151-30/+9
| | | | | | | | | | | | | | | | | | | | | | - Change register allocation hint to a pair of unsigned integers. The hint type is zero (which means prefer the register specified as second part of the pair) or entirely target dependent. - Allow targets to specify alternative register allocation orders based on allocation hint. Part 2. - Use the register allocation hint system to implement more aggressive load / store multiple formation. - Aggressively form LDRD / STRD. These are formed *before* register allocation. It has to be done this way to shorten live interval of base and offset registers. e.g. v1025 = LDR v1024, 0 v1026 = LDR v1024, 0 => v1025,v1026 = LDRD v1024, 0 If this transformation isn't done before allocation, v1024 will overlap v1025 which means it more difficult to allocate a register pair. - Even with the register allocation hint, it may not be possible to get the desired allocation. In that case, the post-allocation load / store multiple pass must fix the ldrd / strd instructions. They can either become ldm / stm instructions or back to a pair of ldr / str instructions. This is work in progress, not yet enabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73381 91177308-0d34-0410-b5e6-96231b3b80d8
* Move register allocation preference (or hint) from LiveInterval to ↵Evan Cheng2009-06-141-2/+35
| | | | | | MachineRegisterInfo. This allows more passes to set them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73346 91177308-0d34-0410-b5e6-96231b3b80d8
* Restore minor deletion.Mike Stump2009-05-041-0/+9
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70892 91177308-0d34-0410-b5e6-96231b3b80d8
* In some rare cases, the register allocator can spill registers but end up ↵Evan Cheng2009-05-031-0/+36
| | | | | | | | | | | not utilizing registers at all. The fundamental problem is linearscan's backtracking can end up freeing more than one allocated registers. However, reloads and restores might be folded into uses / defs and freed registers might not be used at all. VirtRegMap keeps track of allocations so it knows what's not used. As a horrible hack, the stack coloring can color spill slots with *free* registers. That is, it replace reload and spills with copies from and to the free register. It unfold instructions that load and store the spill slot and replace them with register using variants. Not yet enabled. This is part 1. More coming. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70787 91177308-0d34-0410-b5e6-96231b3b80d8
* Oy! When reverting r68073, I added in experimental code. Sorry...Bill Wendling2009-03-311-22/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68099 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert r68073. It's causing a failure in the Apple-style builds.Bill Wendling2009-03-311-1/+22
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68092 91177308-0d34-0410-b5e6-96231b3b80d8
* Add newlines at end of file (this can annoy gcov)Daniel Dunbar2009-03-141-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67000 91177308-0d34-0410-b5e6-96231b3b80d8
* Convert VirtRegMap to a MachineFunctionPass.Owen Anderson2009-03-131-18/+40
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66870 91177308-0d34-0410-b5e6-96231b3b80d8
* Reorganization: Move the Spiller out of VirtRegMap.cpp into its own files. ↵Owen Anderson2009-03-111-1873/+2
| | | | | | No (intended) functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66720 91177308-0d34-0410-b5e6-96231b3b80d8
* Yet another case where the spiller marked two uses of the same register on ↵Evan Cheng2009-03-091-19/+10
| | | | | | the same instruction as kill. This fixes PR3706. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66428 91177308-0d34-0410-b5e6-96231b3b80d8
* If a MI uses the same register more than once, only mark one of them as 'kill'.Evan Cheng2009-03-081-6/+22
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66363 91177308-0d34-0410-b5e6-96231b3b80d8
* Last commit accidentially deleted this code.Evan Cheng2009-02-281-0/+4
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65679 91177308-0d34-0410-b5e6-96231b3b80d8
* The last commit was overly conservative. It's ok to reuse value that's ↵Evan Cheng2009-02-261-7/+0
| | | | | | already marked livein. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65498 91177308-0d34-0410-b5e6-96231b3b80d8
* If an available register falls through to a succ block, unset the last kill. ↵Evan Cheng2009-02-261-37/+76
| | | | | | Sorry, it's impossible to reduce a sensible test case. It basically requires the moon and stars to align in order to cause a failure. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65497 91177308-0d34-0410-b5e6-96231b3b80d8
* A couple of places where reused use operands should be marked kill. This is ↵Evan Cheng2009-02-171-0/+11
| | | | | | exposed by recent availability fallthrough changes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64745 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert this. It was breaking stuff.Bill Wendling2009-02-131-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64428 91177308-0d34-0410-b5e6-96231b3b80d8
* Turn off the old way of handling debug information in the code generator. UseBill Wendling2009-02-131-1/+1
| | | | | | | | the new way, where all of the information is passed on SDNodes and machine instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64427 91177308-0d34-0410-b5e6-96231b3b80d8
* Adjust the sizes for a few SmallVectors to reflect their usage.Dan Gohman2009-02-121-2/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64381 91177308-0d34-0410-b5e6-96231b3b80d8
* It's (currently) not safe to keep certain physical registers live across ↵Evan Cheng2009-02-121-2/+12
| | | | | | basic blocks, e.g. x86 fp stack registers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64374 91177308-0d34-0410-b5e6-96231b3b80d8
* If availability info is kept when fallthrough into a bb, add the available ↵Evan Cheng2009-02-121-3/+21
| | | | | | registers to live-in set. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64372 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove a bogus assertion. It's possible a live-in available value is used by ↵Evan Cheng2009-02-111-2/+0
| | | | | | a previous instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64339 91177308-0d34-0410-b5e6-96231b3b80d8
* Implement PR3495: local spiller optimization. The local spiller can now keep ↵Evan Cheng2009-02-111-91/+208
| | | | | | availability information over BB boundaries. It visits BB's in depth first order. After visiting a BB if it find a successor which has a single predecessor it visits the successor next without clearing the availability information. This allows the successor to omit reloads or change them into copies. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64298 91177308-0d34-0410-b5e6-96231b3b80d8
* Explicitly pass in debug location information to BuildMI.Bill Wendling2009-02-031-1/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63599 91177308-0d34-0410-b5e6-96231b3b80d8
* Change TargetInstrInfo::isMoveInstr to return source and destination ↵Evan Cheng2009-01-201-4/+4
| | | | | | sub-register indices as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62600 91177308-0d34-0410-b5e6-96231b3b80d8
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