a381313d98
We don't need to insert copies for implicit_def's.
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llvm-svn: 56674
2008-09-26 18:50:46 +00:00
4ef4b1a7c1
Fix off-by-one error when updating live intervals.
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llvm-svn: 56567
2008-09-24 21:30:38 +00:00
4cdc18ad80
Add initial support for inserting last minute copies.
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llvm-svn: 56485
2008-09-23 04:37:10 +00:00
97364655dc
Significant improvements to the logic for merging live intervals. This code can't
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just use LI::MergeValueAsValue, as its behavior in the presence of overlapping ranges
isn't what StrongPHIElimination wants.
llvm-svn: 56472
2008-09-22 21:58:58 +00:00
a79db30d28
Tidy up several unbeseeming casts from pointer to intptr_t.
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llvm-svn: 55779
2008-09-04 17:05:41 +00:00
8de6d22392
Use empty() instead of begin() == end().
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llvm-svn: 54780
2008-08-14 18:13:49 +00:00
ef96ac4f95
Get rid of unused variable.
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llvm-svn: 54742
2008-08-13 17:44:52 +00:00
65fce4d813
1) Merge entire live intervals instead of parts of them.
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2) Conditionalize temporary insertion if we don't need it.
llvm-svn: 54741
2008-08-13 17:25:42 +00:00
d172c15ab0
Do a dominator walk when scheduling copies, rather than a DFS on the CFG. Also, fix a few problems when creating
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live intervals for temporaries created by phi elimination.
llvm-svn: 54483
2008-08-07 18:28:07 +00:00
8a8d6f0a78
Correct handle cases where two phis are coalesced together, and correct break up the case where two different
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phis want to coalesce with the same vreg.
llvm-svn: 54426
2008-08-06 22:08:58 +00:00
987b5057d3
We don't need to try to coalesce input vregs that are the same as the output vreg.
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llvm-svn: 54422
2008-08-06 20:29:20 +00:00
f9fca2f2dc
Only trim a live interval if the register is not used after the PHI node.
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llvm-svn: 54421
2008-08-06 18:36:17 +00:00
d9b88a85f2
Oops, we were already checking for dead phis. Handle this the proper way, then.
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llvm-svn: 54371
2008-08-05 21:18:51 +00:00
d4ffa4eb57
We don't need to update live intervals for dead PHIs.
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llvm-svn: 54369
2008-08-05 20:51:26 +00:00
c818c01539
Use existing LiveInterval methods to simplify live interval merging. Thanks to Evan for pointing these out.
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llvm-svn: 54225
2008-07-30 18:27:35 +00:00
1aebe49ae7
When merging live intervals, we also need to merge in any live ranges that are inputs to two-address instructions
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that themselves define a range we already care about.
llvm-svn: 54185
2008-07-30 00:21:16 +00:00
6b1cc46fee
When merging a PHI operand's live interval into the PHI's live interval, we need to merge over all liveranges in
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the operand's interval that share the relevant value number, not just the range that immediately precedes the PHI.
llvm-svn: 54174
2008-07-29 21:17:08 +00:00
54912b3e8d
Fix the issues originally addressed in r54070. After thinking about it some more, I realized that the right thing to do
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is to have StrongPHIElimination use its knowledge of the PHIs before they're erased to update the intervals appropriate. This is
both simpler and more accurate than the alternative, which was having LIA figure it out when it renumbered things, plus it's just
the right thing to do!
llvm-svn: 54077
2008-07-25 23:38:08 +00:00
0346aba5c2
In order to avoid reprocessing a register more than once, we need to add it
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to the handled set so it will get filtered out in future iterations.
llvm-svn: 54065
2008-07-25 21:35:43 +00:00
d9c8711d70
Remove live interval entries for an interval if we're eliminating its only VN.
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llvm-svn: 54062
2008-07-25 21:08:41 +00:00
79b66966b8
Store the predecessor MBB in the PHIUnion, rather than an index, since the indices will change after renumbering.
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llvm-svn: 53985
2008-07-24 17:12:16 +00:00
05d1cd99b3
Remove debugging code.
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llvm-svn: 52016
2008-06-05 18:43:34 +00:00
65dc2b2e06
Use the newly created helper on LiveIntervals.
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llvm-svn: 52013
2008-06-05 17:22:53 +00:00
3a697779fe
Correctly construct live intervals for the copies we inserted into the predecessors of a block containing a PHI.
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llvm-svn: 51950
2008-06-04 17:55:58 +00:00
c777d9e6fe
We need to subtract one from this index because live ranges are open at the end.
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llvm-svn: 51922
2008-06-04 00:38:56 +00:00
e785fb639c
Preserve the register coallescer, and update live intervals more correctly by triggering a renumbering after phi elimination.
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llvm-svn: 51780
2008-05-30 18:38:26 +00:00
0479aa5c0b
Change class' public PassInfo variables to by initialized with the
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address of the PassInfo directly instead of calling getPassInfo.
This eliminates a bunch of dynamic initializations of static data.
Also, fold RegisterPassBase into PassInfo, make a bunch of its
data members const, and rearrange some code to initialize data
members in constructors instead of using setter member functions.
llvm-svn: 51022
2008-05-13 02:05:11 +00:00
d78c400b5b
Clean up the use of static and anonymous namespaces. This turned up
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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
2412158111
In some situations, we need to check for local interferences between the PHI
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node and its inputs.
llvm-svn: 49070
2008-04-02 03:00:13 +00:00
edfc2eb558
Correctly mark a valno that was previous defined by a PHI node as having an
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unknown defining inst after PHI elimination.
llvm-svn: 49069
2008-04-02 02:12:45 +00:00
49dd9f16a9
Don't dereference MBB->end().
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llvm-svn: 49043
2008-04-01 18:05:08 +00:00
f28fc71c93
Fix a major bug in the DFS calculation. Thanks for Christopher Lamb for pointing this out.
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llvm-svn: 48973
2008-03-31 01:39:20 +00:00
8b22873bdd
Remove some unneeded code for LiveInterval joining, and fix a bug in the Phi elimination algorithm where we were accidentally reasoning about
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the source rather than the destination.
llvm-svn: 48936
2008-03-29 01:58:47 +00:00
5d2d1776e0
Dead PHI instructions need to be handled specially.
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llvm-svn: 48811
2008-03-26 03:03:23 +00:00
9f129318dc
Remove some debugging code.
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llvm-svn: 48803
2008-03-25 22:26:43 +00:00
1d46d45e35
StrongPHIElimination doesn't support swapping live intervals like the coalescer does.
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llvm-svn: 48802
2008-03-25 22:25:27 +00:00
e2707768a4
Remove #include<iostream>, which I was using for debugging.
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llvm-svn: 48739
2008-03-24 20:36:47 +00:00
200e57840e
Be sure to remove intervals after we've joined them. Also, remove some duplicated code.
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With this pass, StrongPHIElim can compile very simple testcases correctly. There's still a ways
to go before it's ready for prime time, though.
llvm-svn: 48719
2008-03-24 04:11:27 +00:00
488e645938
A first attempt at updating live intervals, with code lifted from
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the coalescer. This doesn't really work, but gets us farther than
before.
llvm-svn: 48446
2008-03-17 06:08:26 +00:00
944b1c76ab
We also need to collect the VN IDs for the PHI instructions for later updating.
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llvm-svn: 48278
2008-03-12 04:22:57 +00:00
70aaab6dc5
When we're determining what registers to coallesce, track the VNInfo IDs for the definitions that
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feed the PHI instructions. We'll need these IDs in order to update LiveIntervals properly.
llvm-svn: 48277
2008-03-12 03:13:29 +00:00
75d04819a6
Move StrongPHIElimination after live interval analysis. This will make things happier down the road.
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llvm-svn: 48138
2008-03-10 07:22:36 +00:00
636ab19205
some more spelling changes
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llvm-svn: 47996
2008-03-06 10:51:21 +00:00
6325446666
Refactor code. Remove duplicated functions that basically do the same thing as
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findRegisterUseOperandIdx, findRegisterDefOperandIndx. Fix some naming inconsistencies.
llvm-svn: 47927
2008-03-05 00:59:57 +00:00
7fe0bb2b43
Fix an iterator invalidation issue.
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llvm-svn: 46263
2008-01-22 23:58:54 +00:00
7fb6241733
Clarify a deviation from the original algorithm.
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llvm-svn: 46218
2008-01-21 22:03:00 +00:00
d990b4f646
Improve a few comments.
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llvm-svn: 46217
2008-01-21 22:01:01 +00:00
4f45cef2f9
Get rid of all uses of LiveVariables::VarInfo::DefInst in favor of the equivalent API from
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MachineRegisterInfo. Once all clients are switched over, the former will be going away.
llvm-svn: 45805
2008-01-10 01:36:43 +00:00
51b8e20ccf
Add more comments explaining the basics of how the decision of when to rename and when to insert
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copies is made.
llvm-svn: 45799
2008-01-10 00:47:01 +00:00
8958a78576
Get rid of the isKillInst predicate. LiveVariables already provides this information.
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llvm-svn: 45797
2008-01-10 00:33:11 +00:00
1c8152ba03
Copies need to be inserted before the first terminator, not at the end of the block.
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llvm-svn: 45791
2008-01-10 00:01:41 +00:00
436db42a3c
Clean up StrongPHIElimination a bit, and add some more comments to the internal structures. There's
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still more work to do on this front.
llvm-svn: 45783
2008-01-09 22:40:54 +00:00
4de0c3978d
StrongPHIElim: Now with even fewer trivial bugs!
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llvm-svn: 45775
2008-01-09 10:41:39 +00:00
77c3fe441b
Fix an infinite recursion bug in InsertCopies.
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llvm-svn: 45774
2008-01-09 10:32:30 +00:00
e0fd9bd35a
Fix some simple bugs. StrongPHIElimination now does not crash on 164.gzip.
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llvm-svn: 45773
2008-01-09 06:19:05 +00:00
1b0d5c747e
Rename registers that do not need copies.
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llvm-svn: 45759
2008-01-08 21:54:52 +00:00
812e1ea7cf
Actually insert copies now!
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llvm-svn: 45738
2008-01-08 05:16:15 +00:00
47299489ec
Oops, missed one.
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llvm-svn: 45719
2008-01-07 21:32:09 +00:00
bbc6352d1f
Make some predicates static.
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llvm-svn: 45718
2008-01-07 21:30:40 +00:00
a10fff51d9
Rename SSARegMap -> MachineRegisterInfo in keeping with the idea
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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
a5bb370aa4
Add new shorter predicates for testing machine operands for various types:
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e.g. MO.isMBB() instead of MO.isMachineBasicBlock(). I don't plan on
switching everything over, so new clients should just start using the
shorter names.
Remove old long accessors, switching everything over to use the short
accessor: getMachineBasicBlock() -> getMBB(),
getConstantPoolIndex() -> getIndex(), setMachineBasicBlock -> setMBB(), etc.
llvm-svn: 45464
2007-12-30 23:10:15 +00:00
f3ebc3f3d2
Remove attribution from file headers, per discussion on llvmdev.
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llvm-svn: 45418
2007-12-29 20:36:04 +00:00
bccb8c432d
Flesh out the Briggs implementation a little bit more, fix a few FIXMEs.
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llvm-svn: 45347
2007-12-24 22:12:23 +00:00
e110199916
Sketch out an implementation of Briggs' copy placement algorithm.
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llvm-svn: 45334
2007-12-23 15:37:26 +00:00
5a4c05d047
Note what still needs doing.
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llvm-svn: 45310
2007-12-22 04:59:10 +00:00
4534100765
Remove critical edge breaking. It won't be necessary as long as we are very careful when inserting copies.
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llvm-svn: 45309
2007-12-22 04:50:11 +00:00
7b8a741189
Break local interferences in StrongPHIElimination. One step closer...
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llvm-svn: 45070
2007-12-16 05:44:27 +00:00
ccb3981256
A few more comments.
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llvm-svn: 45069
2007-12-16 04:07:23 +00:00
53b677e4e8
Add register pairs to the list to check for local interferences.
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llvm-svn: 44987
2007-12-13 05:53:03 +00:00
1f93edd08a
Remove ugly and horrible code. It's not necessary for correctness, and can be added back later if it causes code quality issues.
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llvm-svn: 44986
2007-12-13 05:43:37 +00:00
499e5bffcf
Forgot to remove a register from the PHI-union after I'd determined that it
...
interfered with other registers. Seems like that might be a good thing to do. :-)
llvm-svn: 44902
2007-12-12 01:25:08 +00:00
f24dd1c1eb
More progress on StrongPHIElimination. Now we actually USE the DomForest!
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llvm-svn: 44877
2007-12-11 20:12:11 +00:00
ba61806ef1
A little more progress on StrongPHIElimination, now that I have a better sense of
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how the CodeGen machinery works.
llvm-svn: 44786
2007-12-10 08:07:09 +00:00
d8167ab332
Run computeDomForest() on the set of registers that need to be tested for
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interference.
llvm-svn: 44064
2007-11-13 20:13:24 +00:00
569ef71e44
Preserve LiveVariables when doing critical edge splitting.
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llvm-svn: 44063
2007-11-13 20:04:45 +00:00
c520c4b325
Break critical edges coming into blocks with PHI nodes.
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llvm-svn: 44019
2007-11-12 17:27:27 +00:00
a1cd45213d
As Chris and Evan pointed out, BreakCriticalMachineEdges doesn't really need
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to be a pass of its own. Instead, move it out into a helper method.
llvm-svn: 44002
2007-11-12 01:05:09 +00:00
bfbc12973d
Take another stab at getting isLiveIn() and isLiveOut() right.
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llvm-svn: 43869
2007-11-08 01:32:45 +00:00
c6a5387d09
Add some more of StrongPHIElim.
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llvm-svn: 43805
2007-11-07 05:17:15 +00:00
d378cea030
Add a few comments.
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llvm-svn: 43755
2007-11-06 05:26:02 +00:00
eb964eb2c8
DomForest is a forest of registers, not instructions.
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llvm-svn: 43754
2007-11-06 05:22:43 +00:00
a9057f0b97
StrongPHIElimination requires LiveVariables.
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llvm-svn: 43751
2007-11-06 04:49:43 +00:00
eea82746b3
Another step of stronger PHI elimination down.
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llvm-svn: 43684
2007-11-04 22:33:26 +00:00
21ca939683
Add a newline at the end of the file.
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llvm-svn: 43550
2007-10-31 08:49:24 +00:00
0b59fa0605
Add the skeleton of a better PHI elimination pass.
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llvm-svn: 43542
2007-10-31 03:37:57 +00:00
Owen Anderson