Commit Graph

285 Commits

Author SHA1 Message Date
Jakob Stoklund Olesen 1331a15b0c Replace TargetRegisterInfo::printReg with a PrintReg class that also works 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.

llvm-svn: 123107
2011-01-09 03:05:53 +00:00
Jakob Stoklund Olesen cf4d5ced0f Fix VirtRegMap to use TRI::index2VirtReg and TRI::virtReg2Index instead of
depending on TRI::FirstVirtualRegister.

Also use TRI::printReg instead of printing virtual registers directly.

llvm-svn: 123101
2011-01-08 23:11:07 +00:00
Jakob Stoklund Olesen 39aed737a6 Remember to resize SpillSlotToUsesMap when allocating an emergency spill slot.
Use amazing new function call technology instead of writing identical code in
multiple places.

This fixes PR8604.

llvm-svn: 119306
2010-11-16 00:41:01 +00:00
Owen Anderson df7a4f2515 Now with fewer extraneous semicolons!
llvm-svn: 115996
2010-10-07 22:25:06 +00:00
Owen Anderson a57b97e7e7 Fix batch of converting RegisterPass<> to INTIALIZE_PASS().
llvm-svn: 109045
2010-07-21 22:09:45 +00:00
Jakob Stoklund Olesen ddbf7a858e Use the right floating point load/store instructions in 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.

llvm-svn: 97262
2010-02-26 21:09:24 +00:00
Dan Gohman 4a618827de Fix "the the" and similar typos.
llvm-svn: 95781
2010-02-10 16:03:48 +00:00
David Greene 91c42f851b Change errs() to dbgs().
llvm-svn: 92587
2010-01-05 01:25:45 +00:00
David Greene 1fbe054450 Add a bool flag to StackObjects telling whether they reference spill
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..

llvm-svn: 87022
2009-11-12 20:49:22 +00:00
Lang Hames 05fb9637f6 The Indexes Patch.
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.

llvm-svn: 85979
2009-11-03 23:52:08 +00:00
Evan Cheng 4729191bb2 Distinquish stack slots from other stack objects. They (and fixed objects) get FixedStack PseudoSourceValues.
llvm-svn: 84326
2009-10-17 09:20:14 +00:00
Chris Lattner 471ba48cb9 remove some uses of llvm/Support/Streams.h
llvm-svn: 79842
2009-08-23 08:43:55 +00:00
Daniel Dunbar 796e43eede Move more to raw_ostream, provide support for writing MachineBasicBlock,
LiveInterval, etc to raw_ostream.

llvm-svn: 76965
2009-07-24 10:36:58 +00:00
Evan Cheng 1283c6a066 Part 1.
- 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.

llvm-svn: 73381
2009-06-15 08:28:29 +00:00
Evan Cheng 085caf10be Move register allocation preference (or hint) from LiveInterval to MachineRegisterInfo. This allows more passes to set them.
llvm-svn: 73346
2009-06-14 20:22:55 +00:00
Evan Cheng 3f77805642 Make sure to color with only allocatable registers for the specific register class.
llvm-svn: 70821
2009-05-04 03:30:11 +00:00
Evan Cheng 210fc62a91 In some rare cases, the register allocator can spill registers but end up 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.

llvm-svn: 70787
2009-05-03 18:32:42 +00:00
Bill Wendling b8017e02ca Oy! When reverting r68073, I added in experimental code. Sorry...
llvm-svn: 68099
2009-03-31 08:41:31 +00:00
Bill Wendling c4b08e5eb0 Revert r68073. It's causing a failure in the Apple-style builds.
llvm-svn: 68092
2009-03-31 08:26:26 +00:00
Daniel Dunbar f24f26c75a Add newlines at end of file (this can annoy gcov)
llvm-svn: 67000
2009-03-14 01:53:05 +00:00
Owen Anderson d37ddf5b5b Convert VirtRegMap to a MachineFunctionPass.
llvm-svn: 66870
2009-03-13 05:55:11 +00:00
Owen Anderson aabe06d92a Reorganization: Move the Spiller out of VirtRegMap.cpp into its own files. No (intended) functionality change.
llvm-svn: 66720
2009-03-11 22:31:21 +00:00
Evan Cheng fb8ded911e Yet another case where the spiller marked two uses of the same register on the same instruction as kill. This fixes PR3706.
llvm-svn: 66428
2009-03-09 19:00:05 +00:00
Evan Cheng de22116f39 If a MI uses the same register more than once, only mark one of them as 'kill'.
llvm-svn: 66363
2009-03-08 03:58:35 +00:00
Evan Cheng 398dee1c4a Last commit accidentially deleted this code.
llvm-svn: 65679
2009-02-28 06:02:14 +00:00
Evan Cheng ca2d65467b The last commit was overly conservative. It's ok to reuse value that's already marked livein.
llvm-svn: 65498
2009-02-26 03:02:21 +00:00
Evan Cheng ee5fd035e2 If an available register falls through to a succ block, unset the last kill. 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.
llvm-svn: 65497
2009-02-26 02:30:42 +00:00
Evan Cheng f505cd5ebb A couple of places where reused use operands should be marked kill. This is exposed by recent availability fallthrough changes.
llvm-svn: 64745
2009-02-17 06:41:03 +00:00
Bill Wendling 65c0fd4c44 Revert this. It was breaking stuff.
llvm-svn: 64428
2009-02-13 02:16:35 +00:00
Bill Wendling 1c21ac3066 Turn off the old way of handling debug information in the code generator. Use
the new way, where all of the information is passed on SDNodes and machine
instructions.

llvm-svn: 64427
2009-02-13 02:01:04 +00:00
Dan Gohman e366c29fa0 Adjust the sizes for a few SmallVectors to reflect their usage.
llvm-svn: 64381
2009-02-12 17:29:01 +00:00
Evan Cheng cf5cd6ecfe It's (currently) not safe to keep certain physical registers live across basic blocks, e.g. x86 fp stack registers.
llvm-svn: 64374
2009-02-12 10:32:17 +00:00
Evan Cheng 8b39b545a9 If availability info is kept when fallthrough into a bb, add the available registers to live-in set.
llvm-svn: 64372
2009-02-12 09:43:23 +00:00
Evan Cheng eb5ec4a0db Remove a bogus assertion. It's possible a live-in available value is used by a previous instruction.
llvm-svn: 64339
2009-02-11 23:41:57 +00:00
Evan Cheng a1968b0fc7 Implement PR3495: local spiller optimization. The local spiller can now keep 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.
llvm-svn: 64298
2009-02-11 08:24:21 +00:00
Bill Wendling 67cd395d45 Explicitly pass in debug location information to BuildMI.
llvm-svn: 63599
2009-02-03 02:29:34 +00:00
Evan Cheng c544cb0eca Change TargetInstrInfo::isMoveInstr to return source and destination sub-register indices as well.
llvm-svn: 62600
2009-01-20 19:12:24 +00:00
Evan Cheng 1718fd4375 Fix PR3124: overly strict assert.
llvm-svn: 60392
2008-12-02 02:15:36 +00:00
Evan Cheng 94169f1021 Fix PR2898. Spiller delete a store for reuse before it knows for sure the reuse happened.
Patch by Lang Hames!

llvm-svn: 57720
2008-10-17 20:56:41 +00:00
Evan Cheng 08acb24225 Fix a very subtle spiller bug: UpdateKills should not forget to track defs of aliases.
llvm-svn: 57673
2008-10-17 06:16:07 +00:00
Dan Gohman 9c4b7d5c4f Fix command-line option printing to print two spaces where needed,
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.

llvm-svn: 57521
2008-10-14 20:25:08 +00:00
Dan Gohman dfe979bcb0 Don't dereference the end() iterator. Thanks to
ENABLE_EXPENSIVE_CHECKS for finding this.

llvm-svn: 57181
2008-10-06 18:00:07 +00:00
Dan Gohman 0d1e9a8e04 Switch the MachineOperand accessors back to the short names like
isReg, etc., from isRegister, etc.

llvm-svn: 57006
2008-10-03 15:45:36 +00:00
Evan Cheng b401449ceb Propagate subreg index when promoting a load to a copy.
llvm-svn: 56085
2008-09-11 01:02:12 +00:00
Evan Cheng 534fe1c405 Fix PR2664 - spiller GetRegForReload wasn't respecting sub-register indices on machine operands.
llvm-svn: 56065
2008-09-10 20:08:45 +00:00
Evan Cheng 93d40ae1e1 Fix an overly strict assertion. Source register of a copy may not be killed, it may be killed by an implicit super-register use.
llvm-svn: 55762
2008-09-04 05:43:55 +00:00
Owen Anderson 7f3bfbd23b Make SimpleSpiller respect subregister indices.
llvm-svn: 54968
2008-08-19 01:05:33 +00:00
Evan Cheng aa33b932bd Fix PR2596: out of bound reference.
llvm-svn: 54375
2008-08-05 21:51:46 +00:00
Dan Gohman 597bd1633e Fix a LocalSpiller leak. This fixes tramp3d-v4.
llvm-svn: 53766
2008-07-18 18:28:56 +00:00
Dan Gohman 3b46030375 Pool-allocation for MachineInstrs, MachineBasicBlocks, and
MachineMemOperands. The pools are owned by MachineFunctions.

This drastically reduces the number of calls to malloc/free made
during the "Emit" phase of scheduling, as well as later phases
in CodeGen. Combined with other changes, this speeds up the
"instruction selection" phase of CodeGen by 10% in some cases.

llvm-svn: 53212
2008-07-07 23:14:23 +00:00
Evan Cheng 50d59478da Cosmetic.
llvm-svn: 52450
2008-06-18 07:47:28 +00:00
Evan Cheng 51c75c0c95 Fix read after free found by valgrind.
llvm-svn: 52309
2008-06-16 07:34:17 +00:00
Evan Cheng fb79059b85 Teach the spiller to commute instructions in order to fold a reload. This hits 410 times on 444.namd and 122 times on 252.eon.
llvm-svn: 52266
2008-06-13 23:58:02 +00:00
Evan Cheng eecdf659e8 Move #include to right place.
llvm-svn: 51932
2008-06-04 09:16:33 +00:00
Bill Wendling 6e326bf0fb Remove warnings about comparison between signed and unsigned expressions.
llvm-svn: 51465
2008-05-23 01:29:08 +00:00
David Greene 54b52fe13b Don't attempt to update SpillSlotToUsesMap for stack slots that aren't
generated by the spiller.

llvm-svn: 51439
2008-05-22 21:12:21 +00:00
Evan Cheng 0609ab646b More local spiller complexity!
If local spiller optimization turns some instruction into an identity copy, it will be removed. If the output register happens to be dead (and source is obviously killed), transfer the kill / dead information to last use / def in the same MBB.

llvm-svn: 51306
2008-05-20 08:13:21 +00:00
Dan Gohman d78c400b5b Clean up the use of static and anonymous namespaces. This turned up
several things that were neither in an anonymous namespace nor static
but not intended to be global.

llvm-svn: 51017
2008-05-13 00:00:25 +00:00
Evan Cheng 7ca4a67ca1 Yet another nasty spiller bug.
%ecx = op
store %cl<kill>, (addr)
(addr) = op %al

It's not safe to unfold the last operand and eliminate store even though %cl is marked kill. It's a sub-register use which means one of its super-register(s) may be used below.

llvm-svn: 50794
2008-05-07 00:49:28 +00:00
Evan Cheng 499ffa9055 Use of implicit_def is not part of live interval. Create empty intervals for the uses when the live interval is being spilled.
llvm-svn: 49542
2008-04-11 17:53:36 +00:00
Evan Cheng ed6e34fe41 Move reMaterialize() from TargetRegisterInfo to TargetInstrInfo.
llvm-svn: 48995
2008-03-31 20:40:39 +00:00
Evan Cheng 289ba4f335 Avoid commuting a def MI in order to coalesce a copy instruction away if any use of the same val# is a copy instruction that has already been coalesced.
llvm-svn: 48833
2008-03-26 19:03:01 +00:00
Evan Cheng 8c19af1b7e A couple of kill marker maintainence bug.
llvm-svn: 48653
2008-03-21 19:09:30 +00:00
Evan Cheng 84aec09fdb Fix PR2138. Apparently any modification to a std::multimap (including remove entries for a different key) can invalidate multimap iterators.
llvm-svn: 48371
2008-03-14 20:44:01 +00:00
Dan Gohman 34ae72c435 Change VirtRegMap's dump to dump to cerr, not DOUT, so that it
can be called from within a debuger without having -debug specified
on the command-line.

llvm-svn: 48298
2008-03-12 20:52:10 +00:00
Evan Cheng 105cb3988b Set NextMII after issuing a physical register spill.
llvm-svn: 48263
2008-03-12 00:14:07 +00:00
Evan Cheng b398635456 Minor debug output bug.
llvm-svn: 48261
2008-03-12 00:02:46 +00:00
Evan Cheng a3891365b5 Transfer physical register spill info when load / store folding happens.
llvm-svn: 48246
2008-03-11 21:34:46 +00:00
Evan Cheng e88a625ecd When the register allocator runs out of registers, spill a physical register around the def's and use's of the interval being allocated to make it possible for the interval to target a register and spill it right away and restore a register for uses. This likely generates terrible code but is before than aborting.
llvm-svn: 48218
2008-03-11 07:19:34 +00:00
Evan Cheng 6325446666 Refactor code. Remove duplicated functions that basically do the same thing as
findRegisterUseOperandIdx, findRegisterDefOperandIndx. Fix some naming inconsistencies.

llvm-svn: 47927
2008-03-05 00:59:57 +00:00
Evan Cheng fdc732ab9a Fix a bug in dead spill slot elimination.
llvm-svn: 47687
2008-02-27 19:57:11 +00:00
Bill Wendling 97925ec704 Final de-tabification.
llvm-svn: 47663
2008-02-27 06:33:05 +00:00
Evan Cheng 6d56368caf Spiller now remove unused spill slots.
llvm-svn: 47657
2008-02-27 03:04:06 +00:00
Bill Wendling d7a258d325 Rename PrintableName to Name.
llvm-svn: 47629
2008-02-26 21:47:57 +00:00
Bill Wendling c24ea4fb41 Change "Name" to "AsmName" in the target register info. Gee, a refactoring tool
would have been a Godsend here!

llvm-svn: 47625
2008-02-26 21:11:01 +00:00
Bill Wendling 7bb51dfbb1 De-tabify.
llvm-svn: 47598
2008-02-26 10:51:52 +00:00
Evan Cheng ea1ef87ea2 Make sure reload of implicit uses are issued before remat's.
llvm-svn: 47492
2008-02-22 19:22:06 +00:00
Evan Cheng c373911461 Enable re-materialization of instructions which have virtual register operands if
the definition of the operand also reaches its uses.

llvm-svn: 47475
2008-02-22 09:24:50 +00:00
Anton Korobeynikov 035eaacd1f Update gcc 4.3 warnings fix patch with recent head changes
llvm-svn: 47368
2008-02-20 11:10:28 +00:00
Dan Gohman 3a4be0fdef Rename MRegisterInfo to TargetRegisterInfo.
llvm-svn: 46930
2008-02-10 18:45:23 +00:00
Evan Cheng f2bd1387b0 Forgot these files.
llvm-svn: 46896
2008-02-08 22:05:27 +00:00
Chris Lattner 03ad885039 rename TargetInstrDescriptor -> TargetInstrDesc.
Make MachineInstr::getDesc return a reference instead
of a pointer, since it can never be null.

llvm-svn: 45695
2008-01-07 07:27:27 +00:00
Chris Lattner b0d06b4381 Move a bunch more accessors from TargetInstrInfo to TargetInstrDescriptor
llvm-svn: 45680
2008-01-07 03:13:06 +00:00
Chris Lattner a98c679de0 Rename MachineInstr::getInstrDescriptor -> getDesc(), which reflects
that it is cheap and efficient to get.

Move a variety of predicates from TargetInstrInfo into 
TargetInstrDescriptor, which makes it much easier to query a predicate
when you don't have TII around.  Now you can use MI->getDesc()->isBranch()
instead of going through TII, and this is much more efficient anyway. Not
all of the predicates have been moved over yet.

Update old code that used MI->getInstrDescriptor()->Flags to use the
new predicates in many places.

llvm-svn: 45674
2008-01-07 01:56:04 +00:00
Owen Anderson 0ec92e9d64 Update CodeGen for MRegisterInfo --> TargetInstrInfo changes.
llvm-svn: 45673
2008-01-07 01:35:56 +00:00
Owen Anderson eee14601b1 Move some more instruction creation methods from RegisterInfo into InstrInfo.
llvm-svn: 45484
2008-01-01 21:11:32 +00:00
Owen Anderson 7a73ae9a86 Move copyRegToReg from MRegisterInfo to TargetInstrInfo. This is part of the
Machine-level API cleanup instigated by Chris.

llvm-svn: 45470
2007-12-31 06:32:00 +00:00
Chris Lattner a10fff51d9 Rename SSARegMap -> MachineRegisterInfo in keeping with the idea
that "machine" classes are used to represent the current state of
the code being compiled.  Given this expanded name, we can start 
moving other stuff into it.  For now, move the UsedPhysRegs and
LiveIn/LoveOuts vectors from MachineFunction into it.

Update all the clients to match.

This also reduces some needless #includes, such as MachineModuleInfo
from MachineFunction.

llvm-svn: 45467
2007-12-31 04:13:23 +00:00
Chris Lattner 6005589faf More cleanups for MachineOperand:
- Eliminate the static "print" method for operands, moving it
    into MachineOperand::print.
  - Change various set* methods for register flags to take a bool
    for the value to set it to.  Remove unset* methods.
  - Group methods more logically by operand flavor in MachineOperand.h

llvm-svn: 45461
2007-12-30 21:56:09 +00:00
Chris Lattner f3ebc3f3d2 Remove attribution from file headers, per discussion on llvmdev.
llvm-svn: 45418
2007-12-29 20:36:04 +00:00
Evan Cheng 6766d2fa4f If deleting a reload instruction due to reuse (value is available in register R and reload is targeting R), make sure to invalidate the kill information of the last kill.
llvm-svn: 44894
2007-12-11 23:36:57 +00:00
Evan Cheng 678b86d6ce MachineInstr can change. Store indexes instead.
llvm-svn: 44612
2007-12-05 10:24:35 +00:00
Evan Cheng 06353b48b5 If a split live interval is spilled again, remove the kill marker on its last use.
llvm-svn: 44611
2007-12-05 09:51:10 +00:00
Evan Cheng d7de56ac93 Fix kill info for split intervals.
llvm-svn: 44609
2007-12-05 08:16:32 +00:00
Evan Cheng 269dbd31d0 - Mark last use of a split interval as kill instead of letting spiller track it.
This allows an important optimization to be re-enabled.
- If all uses / defs of a split interval can be folded, give the interval a
  low spill weight so it would not be picked in case spilling is needed (avoid
  pushing other intervals in the same BB to be spilled).

llvm-svn: 44601
2007-12-05 03:22:34 +00:00
Evan Cheng bb26301864 Add a argument to storeRegToStackSlot and storeRegToAddr to specify whether
the stored register is killed.

llvm-svn: 44600
2007-12-05 03:14:33 +00:00
Evan Cheng e412a4427b Remove a unsafe optimization. This fixes 401.bzip2.
llvm-svn: 44587
2007-12-04 23:57:55 +00:00
Evan Cheng cd8a89b3cd Spiller unfold optimization bug: do not clobber a reusable stack slot value unless it can be modified.
llvm-svn: 44575
2007-12-04 19:19:45 +00:00
Evan Cheng 40965448ff Bug fixes.
llvm-svn: 44549
2007-12-03 21:31:55 +00:00
Evan Cheng 85ef9834a6 Update kill info for uses of split intervals.
llvm-svn: 44531
2007-12-03 09:58:48 +00:00