Commit Graph

391 Commits

Author SHA1 Message Date
David Greene 02f6e9b621 Factor live variable analysis so it does not do register coalescing
simultaneously.  Move that pass to SimpleRegisterCoalescing.

This makes it easier to implement alternative register allocation and
coalescing strategies while maintaining reuse of the existing live
interval analysis.

llvm-svn: 37520
2007-06-08 17:18:56 +00:00
Evan Cheng e1595b6859 Only worry about intervening kill if there are more than one live ranges in the interval.
llvm-svn: 37052
2007-05-14 21:23:51 +00:00
Evan Cheng c690cba7d9 Fix for PR1406:
v1 =
r2 = move v1
   = op r2<kill>
...
r2 = move v1
   = op r2<kill>

Clear the first r2 kill if v1 and r2 are joined.

llvm-svn: 37050
2007-05-14 21:10:05 +00:00
Devang Patel 8c78a0bff0 Drop 'const'
llvm-svn: 36662
2007-05-03 01:11:54 +00:00
Devang Patel e95c6ad802 Use 'static const char' instead of 'static const int'.
Due to darwin gcc bug, one version of darwin linker coalesces
static const int, which defauts PassID based pass identification.

llvm-svn: 36652
2007-05-02 21:39:20 +00:00
Lauro Ramos Venancio 41223586a2 Fix build error.
llvm-svn: 36648
2007-05-02 20:37:47 +00:00
Devang Patel 09f162ca6a Do not use typeinfo to identify pass in pass manager.
llvm-svn: 36632
2007-05-01 21:15:47 +00:00
Evan Cheng 910c80851e Rename findRegisterUseOperand to findRegisterUseOperandIdx to avoid confusion.
llvm-svn: 36483
2007-04-26 19:00:32 +00:00
Evan Cheng 7818c03c6b Fix for PR1306.
- A register def / use now implicitly affects sub-register liveness but does
not affect liveness information of super-registers.
- Def of a larger register (if followed by a use later) is treated as
read/mod/write of a smaller register.

llvm-svn: 36434
2007-04-25 07:30:23 +00:00
Evan Cheng 4c53d321aa VarInfo::UsedBlocks is no longer used. Remove.
llvm-svn: 36250
2007-04-18 05:04:38 +00:00
Evan Cheng b408e8f11d Don't populate TryAgainList when coalescing only physical registers with virtual registers.
llvm-svn: 36240
2007-04-18 02:30:19 +00:00
Evan Cheng b881bdabd9 Copy coalescing change to prevent a physical register from being pin to a
long live interval that has low usage density.
1. Change order of coalescing to join physical registers with virtual
   registers first before virtual register intervals become too long.
2. Check size and usage density to determine if it's worthwhile to join.
3. If joining is aborted, assign virtual register live interval allocation
   preference field to the physical register.
4. Register allocator should try to allocate to the preferred register
   first (if available) to create identify moves that can be eliminated.

llvm-svn: 36218
2007-04-17 20:32:26 +00:00
Evan Cheng 8be98c1572 Re-materialize all loads from fixed stack slots.
llvm-svn: 35660
2007-04-04 07:40:01 +00:00
Evan Cheng 2bf2aadd9a Trivially re-materializable instructions have spill weights that are half of what it would be otherwise.
llvm-svn: 35658
2007-04-04 07:04:55 +00:00
Evan Cheng 476fb6a5c9 Ugh. Copy coalescer does not update register numbers.
llvm-svn: 35600
2007-04-02 18:49:18 +00:00
Evan Cheng 48dd5e7d44 Bug fix for PR1279. When isDead is propagate by copy coalescing, we keep length
of dead def live interval at 1 to avoid multiple def's targeting the same
register. The previous patch missed a case where the source operand is live-in.
In that case, remove the whole interval.

llvm-svn: 35512
2007-03-30 20:18:35 +00:00
Evan Cheng 603e49c6da Move rematerialization out of beta.
llvm-svn: 35419
2007-03-28 08:26:40 +00:00
Evan Cheng b41697c006 Fix for PR1279. Dead def has a live interval of length 1. Copy coalescing should
not violate that.

llvm-svn: 35396
2007-03-28 01:30:37 +00:00
Evan Cheng 4a09b1b5be Fix for PR1266. Don't mark a two address operand IsKill.
llvm-svn: 35365
2007-03-26 22:40:42 +00:00
Evan Cheng a20815e157 Fix for PR1257. Bug in live range shortening as a result of copy coalescing
where the destination is dead.

llvm-svn: 35252
2007-03-22 01:26:05 +00:00
Evan Cheng 0e3278e505 First cut trivial re-materialization support.
llvm-svn: 35208
2007-03-20 08:13:50 +00:00
Evan Cheng 25d00d545d Remove -reduce-joining-phys-regs options. Make it on by default.
llvm-svn: 35165
2007-03-19 18:08:26 +00:00
Evan Cheng c5e74f6404 Minor bug fix.
llvm-svn: 35153
2007-03-19 04:22:35 +00:00
Evan Cheng d8f2e4fe4c - Merge UsedBlocks info after two virtual registers are coalesced.
- Use distance to closest use to determine whether to abort coalescing.

llvm-svn: 35141
2007-03-18 09:05:55 +00:00
Evan Cheng 7b2a001669 Joining a live interval of a physical register with a virtual one can turn out
to be really bad. Once they are joined they are not broken apart. Also, physical
intervals cannot be spilled!

Added a heuristic as a workaround for this. Be careful coalescing with a
physical register if the virtual register uses are "far". Check if there are
uses in the same loop as the source (copy instruction). Check if it is in the
loop preheader, etc.

llvm-svn: 35134
2007-03-17 09:27:35 +00:00
Evan Cheng 88de94a4fb Debugging output stuff.
llvm-svn: 35117
2007-03-15 21:19:28 +00:00
Evan Cheng 3fd728596e Watch out for cases like this:
entry (0x8b056f0, LLVM BB @0x8b01b30, ID#0):
Live Ins: %r0 %r1 %r2 %r3
        %reg1032 = tMOVrr %r3<kill>
        %reg1033 = tMOVri8 1
        %reg1034 = tMOVri8 0
        tCMPi8 %reg1029<kill>, 0
        tBcc mbb<entry,0x8b06a10>, 0
    Successors according to CFG: 0x8b06980 0x8b06a10

entry (0x8b06980, LLVM BB @0x8b01b30, ID#12):
    Predecessors according to CFG: 0x8b056f0
        %reg1036 = tMOVrr %reg1034<kill>
    Successors according to CFG: 0x8b06a10

entry (0x8b06a10, LLVM BB @0x8b01b30, ID#13):
    Predecessors according to CFG: 0x8b056f0 0x8b06980
        %reg1024<dead> = tMOVrr %reg1030<kill>
        ...

reg1030 and r1 have already been joined. When reg1024 and reg1030 are joined,
r1 live range from function entry to the tMOVrr instruction are dead. Eliminate
r1 from the livein set of the entry BB, not the BB where the copy is.

llvm-svn: 34866
2007-03-03 02:18:00 +00:00
Evan Cheng 9d615d1e70 Dead live-in detection bug.
llvm-svn: 34843
2007-03-02 10:41:15 +00:00
Evan Cheng 9be123c568 Oops.
llvm-svn: 34768
2007-03-01 02:05:35 +00:00
Evan Cheng 8a703ad4b6 Track all joined registers and eliminate unneeded kills after all joining are done.
llvm-svn: 34767
2007-03-01 02:03:03 +00:00
Evan Cheng bdec83e4d2 Joining an interval with a dead copy instruction. Shorten the live range to the last use.
llvm-svn: 34645
2007-02-26 21:37:37 +00:00
Evan Cheng 0577b51538 Fix a couple of bugs related IsDead back propagation during coalescing.
llvm-svn: 34595
2007-02-25 09:46:31 +00:00
Evan Cheng e54eb80720 If the liveinterval of the source instruction has been extended, remove the IsKill marker.
llvm-svn: 34594
2007-02-25 09:41:59 +00:00
Evan Cheng 97cc93841d Handle cases when joining live intervals of two virtual registers.
llvm-svn: 34534
2007-02-23 20:40:13 +00:00
Evan Cheng cc607daac1 Remove unnecessary isKill properties if a live range has been lengthened due to coalescing.
llvm-svn: 34503
2007-02-22 23:03:39 +00:00
Jim Laskey 5b2b7c1024 Allow for live in registers for eh landing pads.
llvm-svn: 34475
2007-02-21 22:41:17 +00:00
Evan Cheng e563c7eb27 Out of bound reference.
llvm-svn: 34461
2007-02-21 02:27:39 +00:00
Evan Cheng f7ed82da10 Re-apply my liveintervalanalysis changes. Now with PR1207 fixes.
llvm-svn: 34428
2007-02-19 21:49:54 +00:00
Reid Spencer da81bf4d3e For PR1207:
Revert patches that caused the problem. Evan, please investigate and reapply
when you've discovered the problem.

llvm-svn: 34399
2007-02-19 03:20:00 +00:00
Evan Cheng 2605082f0e - Changes how function livein's are handled, they now have a start index of 0.
- When coalescing a copy MI, if its destination is "dead", propagate the
  property to the source MI's destination if there are no intervening uses.
- Detect dead function live-in's and remove them.

llvm-svn: 34383
2007-02-17 11:15:40 +00:00
Evan Cheng 14edd1989b Use BitVector instead of vector<bool> which can be extremely slow.
llvm-svn: 34302
2007-02-15 05:59:24 +00:00
Evan Cheng b612316f20 Allow any MachineBasicBlock (not just the entry block) to have live-in physical
registers. Make sure liveinterval analysis is correctly creating live ranges
for them.

llvm-svn: 34217
2007-02-13 01:30:55 +00:00
Chris Lattner aee775a6b7 Eliminate static ctors from Statistics
llvm-svn: 32698
2006-12-19 22:41:21 +00:00
Bill Wendling f3baad3ee1 Changed llvm_ostream et all to OStream. llvm_cerr, llvm_cout, llvm_null, are
now cerr, cout, and NullStream resp.

llvm-svn: 32298
2006-12-07 01:30:32 +00:00
Evan Cheng e312c152d2 MI keeps a ptr of TargetInstrDescriptor, use it.
llvm-svn: 32296
2006-12-07 01:21:59 +00:00
Chris Lattner 700b873130 Detemplatize the Statistic class. The only type it is instantiated with
is 'unsigned'.

llvm-svn: 32279
2006-12-06 17:46:33 +00:00
Jeff Cohen cc08c83186 Unbreak VC++ build.
llvm-svn: 32113
2006-12-02 02:22:01 +00:00
Evan Cheng 67fc141db5 Match TargetInstrInfo changes.
llvm-svn: 32098
2006-12-01 21:52:58 +00:00
Bill Wendling 5c3966aa68 Converted to using llvm streams instead of <iostream>s
llvm-svn: 31992
2006-11-29 00:39:47 +00:00
Bill Wendling d811cc6818 Don't recompute getNumOperands for each iteration.
llvm-svn: 31783
2006-11-16 07:35:18 +00:00
Bill Wendling c7969fd1e7 Added a new method "CreateNewLiveInterval" which, given a list of
LiveRanges, creates a new LiveInterval from them. The LiveRanges should
have existed already in another LiveInterval, but removed.

llvm-svn: 31780
2006-11-16 02:41:50 +00:00
Evan Cheng 12ea213de9 A register def can be partially dead when the whole register has use(s) but a subreg does not.
llvm-svn: 31760
2006-11-15 20:54:11 +00:00
Evan Cheng 8c9c6d71ed Add implicit def / use operands to MachineInstr.
llvm-svn: 31633
2006-11-10 08:43:01 +00:00
Jim Laskey 61feeb90f9 Remove redundant <cmath>.
llvm-svn: 31561
2006-11-08 19:16:44 +00:00
Chris Lattner b18177bfab Enable improved spilling costs by default. This speeds up viterbi on x86
by 40%, FreeBench/fourinarow by 20%, and many other programs 10-25%.

On PPC, this speeds up fourinarow by 18%, and probably other things as well.

llvm-svn: 31504
2006-11-07 18:04:58 +00:00
Jim Laskey 6a9342166b Use correct value for float HUGH_VAL.
llvm-svn: 31500
2006-11-07 12:25:45 +00:00
Chris Lattner 01d039cc44 Add a new llcbeta option. This speeds up viterbi from 12.34 to 8.76s on
X86.  If happy, I'll enable this by default.

llvm-svn: 31493
2006-11-07 07:18:40 +00:00
Evan Cheng 299022d514 Proper check for two-addressness.
llvm-svn: 31408
2006-11-03 03:04:46 +00:00
Reid Spencer de46e48420 For PR786:
Turn on -Wunused and -Wno-unused-parameter. Clean up most of the resulting
fall out by removing unused variables. Remaining warnings have to do with
unused functions (I didn't want to delete code without review) and unused
variables in generated code. Maintainers should clean up the remaining
issues when they see them. All changes pass DejaGnu tests and Olden.

llvm-svn: 31380
2006-11-02 20:25:50 +00:00
Chris Lattner 8fb3d445f5 Keep track of the start of MBB's in a separate map from instructions. This
is faster and is needed for future improvements.

llvm-svn: 30383
2006-09-15 03:57:23 +00:00
Chris Lattner 13a5dcddce Fix a long-standing wart in the code generator: two-address instruction lowering
actually *removes* one of the operands, instead of just assigning both operands
the same register.  This make reasoning about instructions unnecessarily complex,
because you need to know if you are before or after register allocation to match
up operand #'s with the target description file.

Changing this also gets rid of a bunch of hacky code in various places.

This patch also includes changes to fold loads into cmp/test instructions in
the X86 backend, along with a significant simplification to the X86 spill
folding code.

llvm-svn: 30108
2006-09-05 02:12:02 +00:00
Chris Lattner 1eed04d1fb Correct fix for a crasher on functions with live in values
llvm-svn: 30099
2006-09-04 18:27:40 +00:00
Chris Lattner bff0b5969f Hack around a regression I introduced yesterday
llvm-svn: 30098
2006-09-04 18:20:15 +00:00
Chris Lattner 8584e940b8 Avoid beating on the mi2i map when we know the answer already.
llvm-svn: 30066
2006-09-03 08:07:11 +00:00
Chris Lattner 774785a79d minor speedup
llvm-svn: 30065
2006-09-03 07:53:50 +00:00
Chris Lattner 75742e532a Iteration is required for some cases, even if they don't occur in crafty.
Restore it, which re-fixes X86/2006-08-21-ExtraMovInst.ll

llvm-svn: 30050
2006-09-02 05:32:53 +00:00
Chris Lattner 5a56d30906 When joining two intervals where the RHS is really simple, use a light-weight
method for joining the live ranges instead of the fully-general one.

llvm-svn: 30049
2006-09-02 05:26:59 +00:00
Chris Lattner 93c067dc2d Pull some code out of a hot recursive function because the common case doesn't
need recursion.

llvm-svn: 30015
2006-09-01 07:00:23 +00:00
Chris Lattner 3eac2c87aa Reserve space in the ValueNumberInfo vector. This speeds up live interval
analysis 16% on crafty.

Wrap long lines.

llvm-svn: 30012
2006-09-01 06:10:18 +00:00
Chris Lattner f765351978 Iterative coallescing doesn't buy us anything (we get identical results on
crafty with and without it).  Removing it speeds up live intervals 6%.

llvm-svn: 30010
2006-09-01 04:02:42 +00:00
Chris Lattner a700a19d04 Add a special case that speeds up coallescing a bit, but not enough.
llvm-svn: 29996
2006-08-31 06:48:26 +00:00
Chris Lattner 78cca7243c Delete copies as they are coallesced instead of waiting until the end.
llvm-svn: 29995
2006-08-31 05:58:59 +00:00
Chris Lattner aa36808fd3 avoid calling the virtual isMoveInstr method endlessly by caching its results.
llvm-svn: 29994
2006-08-31 05:54:43 +00:00
Chris Lattner cb74860cce Fix a compiler crash bootstrapping llvm-gcc.
llvm-svn: 29989
2006-08-30 23:02:29 +00:00
Chris Lattner 34434e97c9 Teach the coallescer to coallesce live intervals joined by an arbitrary
number of copies, potentially defining live ranges that appear to have
differing value numbers that become identical when coallsced.  Among other
things, this fixes CodeGen/X86/shift-coalesce.ll and PR687.

llvm-svn: 29968
2006-08-29 23:18:15 +00:00
Chris Lattner 3c9b2420df Eliminate RegisterAnalysis. RegisterPass now does all that is necessary.
llvm-svn: 29921
2006-08-27 22:30:17 +00:00
Chris Lattner 2c3683a901 typo fix
llvm-svn: 29910
2006-08-27 12:47:48 +00:00
Chris Lattner 122f2bcdc2 Simplifications to liveinterval analysis, no functionality change.
llvm-svn: 29896
2006-08-26 01:28:16 +00:00
Chris Lattner f4f0b1995c Completely change the way that joining with physregs is implemented. This
paves the way for future changes, increases coallescing opportunities (in
theory, not witnessed in practice), and eliminates the really expensive
LiveIntervals::overlapsAliases method.

llvm-svn: 29890
2006-08-25 23:41:24 +00:00
Chris Lattner bdf121060c Take advantage of the recent improvements to the liveintervals set (tracking
instructions which define each value#) to simplify and improve the coallescer.
In particular, this patch:

1. Implements iterative coallescing.
2. Reverts an unsafe hack from handlePhysRegDef, superceeding it with a
   better solution.
3. Implements PR865, "coallescing" away the second copy in code like:

   A = B
   ...
   B = A

This also includes changes to symbolically print registers in intervals
when possible.

llvm-svn: 29862
2006-08-24 22:43:55 +00:00
Chris Lattner 2e9f1bc056 Improve the LiveInterval class to keep track of which machine instruction
defines each value# tracked by the interval.  This will be used to improve
coallescing.

llvm-svn: 29830
2006-08-22 18:19:46 +00:00
Chris Lattner 1d77a0ff88 Print physreg names symbolically in dumps
llvm-svn: 29805
2006-08-21 23:03:54 +00:00
Chris Lattner 213159a6ee Print debug info as:
*** Register mapping ***
  reg 1024 -> %reg1028
  reg 1026 -> EAX
  reg 1027 -> %reg1028

instead of:

*** Register mapping ***
  reg 1024 -> reg 1028
  reg 1026 -> reg 15
  reg 1027 -> reg 1028

llvm-svn: 29803
2006-08-21 22:56:29 +00:00
Jim Laskey 4b49c23571 Eliminate data relocations by using NULL instead of global empty list.
llvm-svn: 29250
2006-07-21 21:15:20 +00:00
Andrew Lenharth c496b418b5 Reduce number of exported symbols
llvm-svn: 29220
2006-07-20 17:28:38 +00:00
Chris Lattner aa2372562e Patches to make the LLVM sources more -pedantic clean. Patch provided
by Anton Korobeynikov!  This is a step towards closing PR786.

llvm-svn: 28447
2006-05-24 17:04:05 +00:00
Evan Cheng 6a6886185b Backing out fix for PR770. Need to re-apply it after live range splitting is possible
llvm-svn: 28236
2006-05-12 06:06:34 +00:00
Evan Cheng 47926aff96 Set weight of zero length intervals to infinite to prevent them from being
spilled.

llvm-svn: 28220
2006-05-11 07:29:24 +00:00
Evan Cheng ae45020720 PR 770 - permit coallescing of registers in subset register classes.
llvm-svn: 28197
2006-05-09 06:37:48 +00:00
Chris Lattner 10d6341618 Move some methods out of MachineInstr into MachineOperand
llvm-svn: 28102
2006-05-04 17:52:23 +00:00
Chris Lattner 4dee67c2cd Remove previous patch, which wasn't quite right.
llvm-svn: 28039
2006-05-01 21:16:03 +00:00
Evan Cheng f71f0f2e0b Local spiller kills a store if the folded restore is turned into a copy.
But this is incorrect if the spilled value live range extends beyond the
current BB.
It is currently controlled by a temporary option -spiller-check-liveout.

llvm-svn: 28024
2006-04-30 08:41:47 +00:00
Chris Lattner de02d7727f Add explicit #includes of <iostream>
llvm-svn: 25515
2006-01-22 23:41:00 +00:00
Chris Lattner b05fce676f Minor cleanup, no functionality change for current targets
llvm-svn: 25173
2006-01-10 05:41:59 +00:00
Chris Lattner b723c33614 Change a variable from being an iterator to a raw MachineInstr*, to make
GDB use tolerable

llvm-svn: 25064
2006-01-03 07:41:37 +00:00
Chris Lattner 3c7974aade Fix some spello's pointed out by Gabor Greif
llvm-svn: 24019
2005-10-26 18:41:41 +00:00
Chris Lattner e95b5745c0 Make the coallescer a bit smarter, allowing it to join more live ranges.
For example, we can now join things like [0-30:0)[31-40:1)[52-59:2)
with [40:60:0) if the 52-59 range is defined by a copy from the 40-60 range.
The resultant range ends up being [0-30:0)[31-60:1).

This fires a lot through-out the test suite (e.g. shrinking bc from
19492 -> 18509 machineinstrs) though most gains are smaller (e.g. about
50 copies eliminated from crafty).

llvm-svn: 23866
2005-10-21 06:49:50 +00:00
Chris Lattner b1f8982ff0 Expose the LiveInterval interfaces as public headers.
llvm-svn: 23400
2005-09-21 04:19:09 +00:00
Chris Lattner ce3662f2a2 remove debugging code *slaps head*
llvm-svn: 23294
2005-09-09 19:19:20 +00:00
Chris Lattner c9053083eb When spilling a live range that is used multiple times by one instruction,
only add a reload live range once for the instruction.  This is one step
towards fixing a regalloc pessimization that Nate notice, but is later undone
by the spiller (so no code is changed).

llvm-svn: 23293
2005-09-09 19:17:47 +00:00
Chris Lattner 5d16dbd5bb Fix a bug that Tzu-Chien Chiu noticed: live interval analysis does NOT
preserve livevar

llvm-svn: 23259
2005-09-07 17:34:39 +00:00
Chris Lattner 7138f91424 Teach live intervals to not crash on dead livein regs
llvm-svn: 23206
2005-09-02 00:20:32 +00:00
Chris Lattner 774158239b Simplify this code by using higher-level LiveVariables methods
llvm-svn: 22989
2005-08-23 22:51:41 +00:00
Chris Lattner 96cbfbbeaf Fix debug info to not print out recently freed memory.
llvm-svn: 22529
2005-07-27 23:11:25 +00:00
Chris Lattner 9937713252 Print symbolic register names in debug dumps
llvm-svn: 22528
2005-07-27 23:03:38 +00:00
Chris Lattner c08d786ba5 Print the symbolic register name in a register allocator debug dump.
llvm-svn: 22002
2005-05-14 05:34:15 +00:00
Chris Lattner 91caf1d039 allow a virtual register to be associated with live-in values.
llvm-svn: 21927
2005-05-13 07:08:07 +00:00
Misha Brukman 835702a094 Remove trailing whitespace
llvm-svn: 21420
2005-04-21 22:36:52 +00:00
Chris Lattner 1a44855f8f there is no need to remove this instruction, linscan does it already as it
removes noop moves.

llvm-svn: 21183
2005-04-09 16:24:20 +00:00
Chris Lattner 0b1681bce1 Adjust live intervals to support a livein set
llvm-svn: 21182
2005-04-09 16:17:50 +00:00
Chris Lattner 6f6ecad995 I didn't mean to check this in. :(
llvm-svn: 20555
2005-03-10 20:59:51 +00:00
Chris Lattner 76aa8e071b Allow the live interval analysis pass to be a bit more aggressive about
numbering values in live ranges for physical registers.

The alpha backend currently generates code that looks like this:

  vreg = preg
...
  preg = vreg
  use preg
...
  preg = vreg
  use preg

etc.  Because vreg contains the value of preg coming in, each of the
copies back into preg contain that initial value as well.

In the case of the Alpha, this allows this testcase:

void "foo"(int %blah) {
        store int 5, int *%MyVar
        store int 12, int* %MyVar2
        ret void
}

to compile to:

foo:
        ldgp $29, 0($27)
        ldiq $0,5
        stl $0,MyVar
        ldiq $0,12
        stl $0,MyVar2
        ret $31,($26),1

instead of:

foo:
        ldgp $29, 0($27)
        bis $29,$29,$0
        ldiq $1,5
        bis $0,$0,$29
        stl $1,MyVar
        ldiq $1,12
        bis $0,$0,$29
        stl $1,MyVar2
        ret $31,($26),1

This does not seem to have any noticable effect on X86 code.

This fixes PR535.

llvm-svn: 20536
2005-03-09 23:05:19 +00:00
Chris Lattner e64ff1c4b2 Silence warnings from VS
llvm-svn: 19386
2005-01-08 19:55:00 +00:00
Reid Spencer 9083936835 For PR387:\
Make only one print method to avoid overloaded virtual warnings when \
compiled with -Woverloaded-virtual

llvm-svn: 18589
2004-12-07 04:03:45 +00:00
Chris Lattner b56cb729bd Reduce usage of MRegisterInfo::getRegClass
llvm-svn: 17238
2004-10-26 05:29:18 +00:00
Chris Lattner 111c3e827e Patch to support MSVC better, contributed by Morten Ofstad
llvm-svn: 17215
2004-10-25 18:40:47 +00:00
Chris Lattner 1905ae69c1 When a virtual register is folded into an instruction, keep track of whether
it was a use, def, or both.  This allows us to be less pessimistic in our
analysis of them.  In practice, this doesn't make a big difference, but it
doesn't hurt either.

llvm-svn: 16632
2004-10-01 23:15:36 +00:00
Chris Lattner f06f4a7c68 Pretty print a bit nicer :)
llvm-svn: 16628
2004-10-01 19:01:39 +00:00
Chris Lattner 55c1402f25 There is no need to call MachineInstr::print directly, just send the MI& to an ostream.
llvm-svn: 16613
2004-09-30 16:10:45 +00:00
Chris Lattner b0b707fc75 * Wrap some comments to 80 cols
* Add const_iterator stuff
* Add a print method, which means that I can now call dump() from the
  debugger.

llvm-svn: 16612
2004-09-30 15:59:17 +00:00
Alkis Evlogimenos 213e6db9ce Grow the map on entry so that we don't crash if joinIntervals never
runs (if coalescing is disabled for example).

llvm-svn: 16259
2004-09-09 19:24:38 +00:00
Alkis Evlogimenos adb2ce2962 Use a DenseMap for mapping reg->reg. This improves the LiveInterval
analysis running time from 2.7869secs to 2.5226secs on 176.gcc.

llvm-svn: 16244
2004-09-08 03:01:50 +00:00
Misha Brukman 14a2b4628d Order #includes alphabetically, local .h files first.
llvm-svn: 16153
2004-09-03 18:25:53 +00:00
Alkis Evlogimenos a5c04ee50f Fixes to make LLVM compile with vc7.1.
Patch contributed by Paolo Invernizzi!

llvm-svn: 16152
2004-09-03 18:19:51 +00:00
Reid Spencer 7c16caa336 Changes For Bug 352
Move include/Config and include/Support into include/llvm/Config,
include/llvm/ADT and include/llvm/Support. From here on out, all LLVM
public header files must be under include/llvm/.

llvm-svn: 16137
2004-09-01 22:55:40 +00:00
Alkis Evlogimenos b84f0be5b1 Minor code clarity changes.
llvm-svn: 16123
2004-08-31 17:39:15 +00:00
Alkis Evlogimenos 8c67a3003e Only update LiveVariables if it is available. addIntervalsForSpills
runs after the initial run of the live interval analysis.

llvm-svn: 16075
2004-08-27 18:59:22 +00:00
Alkis Evlogimenos 542ac1cba7 Use newly added API in MRegisterInfo.
llvm-svn: 16060
2004-08-26 22:22:38 +00:00
Chris Lattner d8b5be4726 Fix a bug in a previous checkin of mine, correcting
Regression.CodeGen.Generic.2004-04-09-SameValueCoalescing.llx and the
code size problem.

This bug prevented us from doing most register coallesces.

llvm-svn: 16031
2004-08-24 17:48:29 +00:00
Chris Lattner 5943c5078c Reduce usage of MRegisterInfo::getRegClass
llvm-svn: 15784
2004-08-15 22:23:09 +00:00
Alkis Evlogimenos 4242241a69 Clean up whitespace.
llvm-svn: 15490
2004-08-04 09:46:56 +00:00
Alkis Evlogimenos a698308cce Convert indentation to 2 spaces.
llvm-svn: 15489
2004-08-04 09:46:26 +00:00
Chris Lattner bbe845b969 Fix the sense of joinable
llvm-svn: 15196
2004-07-25 07:47:25 +00:00
Chris Lattner 83b9c50f8f Fix a bug where we incorrectly value numbered the first PHI definition the
same as the PHI use.  This is not correct as the PHI use value is different
depending on which branch is taken.  This fixes espresso with aggressive
coallescing, and perhaps others.

llvm-svn: 15189
2004-07-25 05:45:18 +00:00
Chris Lattner 0e58e5e48c Add debugging output for joining assignments
llvm-svn: 15187
2004-07-25 03:24:11 +00:00
Alkis Evlogimenos cf72e7f854 Change std::map<unsigned, LiveInterval*> into a std::map<unsigned,
LiveInterval>. This saves some space and removes the pointer
indirection caused by following the pointer.

llvm-svn: 15167
2004-07-24 11:44:15 +00:00
Chris Lattner 8c595eb4bd whoops, didn't mean to remove this
llvm-svn: 15157
2004-07-24 04:32:22 +00:00
Chris Lattner c51866a20e Completely eliminate the intervals_ list. instead, the r2iMap_ maintains
ownership of the intervals.

llvm-svn: 15155
2004-07-24 03:32:06 +00:00
Chris Lattner 7efcdb7ca3 Big change to compute logical value numbers for each LiveRange added to an
Interval.  This generalizes the isDefinedOnce mechanism that we used before
to help us coallesce ranges that overlap.  As part of this, every logical
range with a different value is assigned a different number in the interval.
For example, for code that looks like this:

0  X = ...
4  X += ...
  ...
N    = X

We now generate a live interval that contains two ranges: [2,6:0),[6,?:1)
reflecting the fact that there are two different values in the range at
different positions in the code.

Currently we are not using this information at all, so this just slows down
liveintervals.  In the future, this will change.

Note that this change also substantially refactors the joinIntervalsInMachineBB
method to merge the cases for virt-virt and phys-virt joining into a single
case, adds comments, and makes the code a bit easier to follow.

llvm-svn: 15154
2004-07-24 02:59:07 +00:00
Chris Lattner 1604b02c4c More minor changes:
* Inline some functions
 * Eliminate some comparisons from the release build

This is good for another .3 on gcc.

llvm-svn: 15144
2004-07-23 21:24:19 +00:00
Chris Lattner 856383326a Rename LiveIntervals.(cpp|h) -> LiveIntervalAnalysis.(cpp|h)
llvm-svn: 15135
2004-07-23 17:56:30 +00:00