33281864c1
If a PHI node has a single implicit_def source, replace it with an implicit_def instead of a copy.
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llvm-svn: 49543
2008-04-11 17:54:45 +00:00
499ffa9055
Use of implicit_def is not part of live interval. Create empty intervals for the uses when the live interval is being spilled.
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llvm-svn: 49542
2008-04-11 17:53:36 +00:00
c422383e08
detabify
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llvm-svn: 49524
2008-04-11 09:34:57 +00:00
c6864b6652
Remove implicit_def instructions that become dead as result of coalescing.
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llvm-svn: 49513
2008-04-10 23:48:35 +00:00
2cb98eb4bb
Allow registers defined by implicit_def to be clobbered.
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llvm-svn: 49512
2008-04-10 23:47:53 +00:00
16ea87d6ee
A copy instruction may use a register multiple times on some targets. Change them all.
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llvm-svn: 49491
2008-04-10 18:38:47 +00:00
5e1971c894
Add comment.
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llvm-svn: 49469
2008-04-10 08:03:14 +00:00
9d339849ee
Teach branch folding pass about implicit_def instructions. Unfortunately we can't just eliminate them since register scavenger expects every register use to be defined. However, we can delete them when there are no intra-block uses. Carefully removing some implicit def's which enable more blocks to be optimized away.
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llvm-svn: 49461
2008-04-10 02:32:10 +00:00
c8eeb752a3
- More aggressively coalescing away copies whose source is defined by an implicit_def.
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- Added insert_subreg coalescing support.
llvm-svn: 49448
2008-04-09 20:57:25 +00:00
aa3b55f842
Missed a hasInterval check.
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llvm-svn: 49415
2008-04-09 01:30:15 +00:00
344aec2952
Implement new llc flag -disable-required-unwind-tables.
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Corresponds to -fno-unwind-tables (usually default in gcc).
llvm-svn: 49361
2008-04-08 00:10:24 +00:00
3bc3ddd638
Rename MemOperand to MachineMemOperand. This was suggested by
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review feedback from Chris quite a while ago. No functionality
change.
llvm-svn: 49348
2008-04-07 19:35:22 +00:00
51f532f92d
Re-commit of the r48822, where the infinite looping problem discovered
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by Dan Gohman is fixed.
llvm-svn: 49330
2008-04-07 10:06:32 +00:00
4db1f62d84
Silence warning when no assertions.
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llvm-svn: 49284
2008-04-06 21:46:45 +00:00
613d7afe64
Prefer to expand mask for xor to -1, so we have a chance to turn it into a not.
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If it cannot be expanded, it will keep the old behaviour and try to shrink the constant.
Part of enhancement for PR2191.
llvm-svn: 49280
2008-04-06 21:23:02 +00:00
e9ecc68d8f
API changes for class Use size reduction, wave 1.
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Specifically, introduction of XXX::Create methods
for Users that have a potentially variable number of
Uses.
llvm-svn: 49277
2008-04-06 20:25:17 +00:00
b5fdc923d3
1. IMPLICIT_DEF can *re-define* any register.
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2. Coalescer can now create an interesting situation where a register def can
reaches itself without being killed.
llvm-svn: 49246
2008-04-05 01:27:09 +00:00
0ce4a7cc44
Make sure both PendingLoads and PendingExports are flushed
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before an invoke. Failure to do this causes references in
the landing pad to variables that were not set. Fixes
g++.dg/eh/delayslot1.C
g++.dg/eh/fp-regs.C
g++.old-deja/g++.brendan/eh1.C
llvm-svn: 49243
2008-04-04 23:48:31 +00:00
14bee50e06
Undo PHI elimination copy placement patch. This causes coalescing (performace) issues.
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llvm-svn: 49198
2008-04-04 01:20:05 +00:00
823017fdd1
This is done.
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llvm-svn: 49197
2008-04-04 01:19:03 +00:00
bfb7246fb6
if some functions don't have debug info, we were outputing the same label at the start of each of those functions. This makes assemblers unhappy
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llvm-svn: 49176
2008-04-03 17:37:43 +00:00
58936a48ee
- Turn copies of implicit_def into implicit_def instructions.
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- Be smarter about coalescing copies from implicit_def.
llvm-svn: 49168
2008-04-03 16:41:54 +00:00
6d07b625aa
Special handling of zero-sized live intervals.
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llvm-svn: 49167
2008-04-03 16:40:27 +00:00
20aed56504
- Treat a live range defined by an implicit_def as a zero-sized one.
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- Eliminate an implicit_def when it's being spilled.
llvm-svn: 49166
2008-04-03 16:39:43 +00:00
aacf4f15b3
- PHI elimination also eliminates implicit_def that fits into a PHI node rather than copying it.
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- Be (slightly) smarter about where to place the copies.
llvm-svn: 49165
2008-04-03 16:38:20 +00:00
916802a78e
Start of a series of patches related to implicit_def.
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There is no point in creating a long live range defined by an implicit_def. Scheduler now duplicates implicit_def instruction for each of its uses. Therefore, if an implicit_def node has multiple uses, it will become a number of very short live ranges, rather than a long one. This will make coalescer's job easier.
llvm-svn: 49164
2008-04-03 16:36:07 +00:00
025cea1126
Backing out 48222 temporarily.
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llvm-svn: 49124
2008-04-03 03:13:16 +00:00
491557712a
Make EH work with unnamed functions. Reenable running
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StripSymbols when EH is on.
llvm-svn: 49110
2008-04-02 20:10:52 +00:00
d8616064d8
Now that I am told MachineRegisterInfo also tracks physical register uses / defs, I can do away with the horribleness I introduced a while back. It's impossible to detect if there is any use of a physical register below an instruction (and before any def of the register) with some cheap book keeping.
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llvm-svn: 49105
2008-04-02 18:04:08 +00:00
be3d44c3cb
Remove #include<map> from LiveVariables.h. Not referenced.
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llvm-svn: 49099
2008-04-02 17:23:50 +00:00
8780ecbbac
Cosmetic changes per EH patch review feedback.
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llvm-svn: 49096
2008-04-02 17:04:45 +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
fd967cf3fa
Recommitting EH patch; this should answer most of the
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review feedback.
-enable-eh is still accepted but doesn't do anything.
EH intrinsics use Dwarf EH if the target supports that,
and are handled by LowerInvoke otherwise.
The separation of the EH table and frame move data is,
I think, logically figured out, but either one still
causes full EH info to be generated (not sure how to
split the metadata correctly).
MachineModuleInfo::needsFrameInfo is no longer used and
is removed.
llvm-svn: 49064
2008-04-02 00:25:04 +00:00
985a0b51d7
Re-materialization is for uses only.
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llvm-svn: 49053
2008-04-01 21:37:32 +00:00
5e4e051c2a
Revert 49006 for the moment.
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llvm-svn: 49046
2008-04-01 20:00:57 +00:00
49dd9f16a9
Don't dereference MBB->end().
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llvm-svn: 49043
2008-04-01 18:05:08 +00:00
0bd72c5ccd
More soft fp fixes.
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llvm-svn: 49016
2008-04-01 02:18:22 +00:00
4cabe4b452
Pasto.
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llvm-svn: 49014
2008-04-01 02:00:09 +00:00
611abc03ed
Add comment.
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llvm-svn: 49013
2008-04-01 01:51:26 +00:00
86e476b7cb
Unbreak ARM / Thumb soft FP support.
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llvm-svn: 49012
2008-04-01 01:50:16 +00:00
7d02cf3c9c
Emit exception handling info for functions which are
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not marked nounwind, or for all functions when -enable-eh
is set, provided the target supports Dwarf EH.
llvm-gcc generates nounwind in the right places; other FEs
will need to do so also. Given such a FE, -enable-eh should
no longer be needed.
llvm-svn: 49006
2008-03-31 23:40:23 +00:00
e4f77c69ac
It's not safe to fold a load from GV stub or constantpool into a two-address use.
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llvm-svn: 49002
2008-03-31 23:19:51 +00:00
ed6e34fe41
Move reMaterialize() from TargetRegisterInfo to TargetInstrInfo.
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llvm-svn: 48995
2008-03-31 20:40:39 +00:00
f549b26254
Fix a DAGCombiner optimization to respect volatile qualification.
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llvm-svn: 48994
2008-03-31 20:32:52 +00:00
73d7c3bfba
The support for remat of instructions with a register operand is hackish, to say the least. Since the register operand guaranteed to be PIC base and that it is already live at all uses, we are making sure it will not be spilled after its uses are rematerialized for both performance and correctness reasons.
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llvm-svn: 48976
2008-03-31 07:53:30 +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
0f760dfe09
Fix "Control reaches the end of non-void function" warnings,
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patch by David Chisnall.
llvm-svn: 48963
2008-03-30 18:22:13 +00:00
16d72072df
Cosmetic changes.
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llvm-svn: 48947
2008-03-29 18:34:22 +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
Evan Cheng