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2011-03-23Dump the register map before rewriting.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128143 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-18Add VirtRegMap::rewrite() and use it in the new register allocators.Jakob Stoklund Olesen
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
2011-01-10Simplify a bunch of isVirtualRegister() and isPhysicalRegister() logic.Jakob Stoklund Olesen
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
2011-01-09Remove MachineRegisterInfo::getLastVirtReg(), it was giving wrong resultsJakob Stoklund Olesen
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
2011-01-09Replace TargetRegisterInfo::printReg with a PrintReg class that also works ↵Jakob Stoklund Olesen
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
2011-01-08Fix VirtRegMap to use TRI::index2VirtReg and TRI::virtReg2Index instead ofJakob Stoklund Olesen
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
2010-11-16Remember to resize SpillSlotToUsesMap when allocating an emergency spill slot.Jakob Stoklund Olesen
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
2010-10-07Now with fewer extraneous semicolons!Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115996 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-21Fix batch of converting RegisterPass<> to INTIALIZE_PASS().Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109045 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-26Use the right floating point load/store instructions in ↵Jakob Stoklund Olesen
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
2010-02-10Fix "the the" and similar typos.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95781 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-05Change errs() to dbgs().David Greene
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92587 91177308-0d34-0410-b5e6-96231b3b80d8
2009-11-12Add a bool flag to StackObjects telling whether they reference spillDavid Greene
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
2009-11-03The Indexes Patch.Lang Hames
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
2009-10-17Distinquish stack slots from other stack objects. They (and fixed objects) ↵Evan Cheng
get FixedStack PseudoSourceValues. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84326 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-23remove some uses of llvm/Support/Streams.hChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79842 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-24Move more to raw_ostream, provide support for writing MachineBasicBlock,Daniel Dunbar
LiveInterval, etc to raw_ostream. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76965 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-15Part 1.Evan Cheng
- 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
2009-06-14Move register allocation preference (or hint) from LiveInterval to ↵Evan Cheng
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
2009-05-04Restore minor deletion.Mike Stump
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70892 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-03In some rare cases, the register allocator can spill registers but end up ↵Evan Cheng
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
2009-03-31Oy! When reverting r68073, I added in experimental code. Sorry...Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68099 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-31Revert r68073. It's causing a failure in the Apple-style builds.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68092 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-14Add newlines at end of file (this can annoy gcov)Daniel Dunbar
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67000 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-13Convert VirtRegMap to a MachineFunctionPass.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66870 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-11Reorganization: Move the Spiller out of VirtRegMap.cpp into its own files. ↵Owen Anderson
No (intended) functionality change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66720 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-09Yet another case where the spiller marked two uses of the same register on ↵Evan Cheng
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
2009-03-08If a MI uses the same register more than once, only mark one of them as 'kill'.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66363 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-28Last commit accidentially deleted this code.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65679 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-26The last commit was overly conservative. It's ok to reuse value that's ↵Evan Cheng
already marked livein. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65498 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-26If an available register falls through to a succ block, unset the last kill. ↵Evan Cheng
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
2009-02-17A couple of places where reused use operands should be marked kill. This is ↵Evan Cheng
exposed by recent availability fallthrough changes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64745 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-13Revert this. It was breaking stuff.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64428 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-13Turn off the old way of handling debug information in the code generator. UseBill Wendling
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
2009-02-12Adjust the sizes for a few SmallVectors to reflect their usage.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64381 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-12It's (currently) not safe to keep certain physical registers live across ↵Evan Cheng
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
2009-02-12If availability info is kept when fallthrough into a bb, add the available ↵Evan Cheng
registers to live-in set. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64372 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-11Remove a bogus assertion. It's possible a live-in available value is used by ↵Evan Cheng
a previous instruction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64339 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-11Implement PR3495: local spiller optimization. The local spiller can now keep ↵Evan Cheng
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
2009-02-03Explicitly pass in debug location information to BuildMI.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63599 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-20Change TargetInstrInfo::isMoveInstr to return source and destination ↵Evan Cheng
sub-register indices as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62600 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-02Fix PR3124: overly strict assert.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60392 91177308-0d34-0410-b5e6-96231b3b80d8
2008-10-17Fix PR2898. Spiller delete a store for reuse before it knows for sure the ↵Evan Cheng
reuse happened. Patch by Lang Hames! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57720 91177308-0d34-0410-b5e6-96231b3b80d8
2008-10-17Fix a very subtle spiller bug: UpdateKills should not forget to track defs ↵Evan Cheng
of aliases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57673 91177308-0d34-0410-b5e6-96231b3b80d8
2008-10-14Fix command-line option printing to print two spaces where needed,Dan Gohman
instead of requiring all "short description" strings to begin with two spaces. This makes these strings less mysterious, and it fixes some cases where short description strings mistakenly did not begin with two spaces. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57521 91177308-0d34-0410-b5e6-96231b3b80d8
2008-10-06Don't dereference the end() iterator. Thanks toDan Gohman
ENABLE_EXPENSIVE_CHECKS for finding this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57181 91177308-0d34-0410-b5e6-96231b3b80d8
2008-10-03Switch the MachineOperand accessors back to the short names likeDan Gohman
isReg, etc., from isRegister, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57006 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-11Propagate subreg index when promoting a load to a copy.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56085 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-10Fix PR2664 - spiller GetRegForReload wasn't respecting sub-register indices ↵Evan Cheng
on machine operands. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56065 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-04Fix an overly strict assertion. Source register of a copy may not be killed, ↵Evan Cheng
it may be killed by an implicit super-register use. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55762 91177308-0d34-0410-b5e6-96231b3b80d8
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