87b02d5bbc
Factor out LiveIntervalAnalysis' code to determine whether an instruction
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is trivially rematerializable and integrate it into
TargetInstrInfo::isTriviallyReMaterializable. This way, all places that
need to know whether an instruction is rematerializable will get the
same answer.
This enables the useful parts of the aggressive-remat option by
default -- using AliasAnalysis to determine whether a memory location
is invariant, and removes the questionable parts -- rematting operations
with virtual register inputs that may not be live everywhere.
llvm-svn: 83687
2009-10-09 23:27:56 +00:00
e19c1810d7
isTriviallyReMaterializable checks the
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TargetInstrDesc::isRematerializable flag, so it isn't necessary to do
this check in its callers.
llvm-svn: 83671
2009-10-09 21:02:10 +00:00
7ddb844a2d
Give Dan and my recent changes, machine LICM is now code size neutral.
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llvm-svn: 83624
2009-10-09 06:31:25 +00:00
ccd4545ecb
Fix a logic error that caused non-rematable loop invariants loads to be licm'ed out of loop.
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llvm-svn: 83622
2009-10-09 06:21:52 +00:00
be8137b0b4
Replace TargetInstrInfo::isInvariantLoad and its target-specific
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implementations with a new MachineInstr::isInvariantLoad, which uses
MachineMemOperands and is target-independent. This brings MachineLICM
and other functionality to targets which previously lacked an
isInvariantLoad implementation.
llvm-svn: 83475
2009-10-07 17:38:06 +00:00
2f5bdcb7c2
Don't hoist or sink instructions with physreg uses if the physreg is
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allocatable. Even if it doesn't appear to have any defs, it may latter
on after register allocation.
llvm-svn: 82834
2009-09-26 02:34:00 +00:00
e30d63f1d8
Unbreak MachineLICM for instructions that reference RIP on x86-64 too.
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llvm-svn: 82825
2009-09-25 23:58:45 +00:00
8781b35be5
Convert DOUT to DEBUG(errs()...).
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llvm-svn: 79754
2009-08-22 20:25:44 +00:00
7c50c9bd63
Tidy #includes.
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llvm-svn: 78677
2009-08-11 16:02:12 +00:00
0dd5e1ed39
More migration to raw_ostream, the water has dried up around the iostream hole.
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- Some clients which used DOUT have moved to DEBUG. We are deprecating the
"magic" DOUT behavior which avoided calling printing functions when the
statement was disabled. In addition to being unnecessary magic, it had the
downside of leaving code in -Asserts builds, and of hiding potentially
unnecessary computations.
llvm-svn: 77019
2009-07-25 00:23:56 +00:00
8d0b4d4fd6
MachineLICM CSE should match destination register classes; avoid hoisting implicit_def's.
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llvm-svn: 65592
2009-02-27 00:02:22 +00:00
9d8bfbfdef
Machine LICM increases register pressure and it almost always increase code size. For now, disable it for optimizing for size.
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llvm-svn: 63856
2009-02-05 08:51:13 +00:00
399660c384
Teach machine licm to CSE hoisted instructions.
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llvm-svn: 63854
2009-02-05 08:45:46 +00:00
4ded601445
Don't call isInvariantLoad twice.
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llvm-svn: 63729
2009-02-04 09:21:58 +00:00
1d9f7ac8cc
Don't bother hoisting out a "cheap" instruction if all of its uses are PHIs. LICM "cheap" instructions are not particularly beneficial to start with. This will just end up making the copies harder to coalesce.
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llvm-svn: 63728
2009-02-04 09:19:56 +00:00
0649abdfe2
For now, only hoist re-materilizable instructions. LICM will increase register pressure. We want to avoid spilling more instructions if it's possible.
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llvm-svn: 63725
2009-02-04 07:17:49 +00:00
79618d1de8
Simplify the MachineLICM pass by having it only traverse outer
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loops, hoisting instructions all the way out in one step rather
than hoisting them one nest level at a time. Also, make a few
other code simplifications. This speeds up MachineLICM
by several fold.
llvm-svn: 62283
2009-01-15 22:01:38 +00:00
906152a20f
Tidy up #includes, deleting a bunch of unnecessary #includes.
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llvm-svn: 61715
2009-01-05 17:59:02 +00:00
072e52f170
Use isTerminator() instead of isBranch()||isReturn() in
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several places. isTerminator() returns true for a superset
of cases, and includes things like FP_REG_KILL, which are
nither return or branch but aren't safe to move/remat/etc.
llvm-svn: 61373
2008-12-23 17:28:50 +00:00
83682a9441
Give MachineLICM a name, for -time-passes etc.
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llvm-svn: 61184
2008-12-18 01:37:56 +00:00
0d1e9a8e04
Switch the MachineOperand accessors back to the short names like
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isReg, etc., from isRegister, etc.
llvm-svn: 57006
2008-10-03 15:45:36 +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
58bb4f1bf0
Cosmetic changes to Machine LICM. No functionality change.
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llvm-svn: 55578
2008-08-31 02:30:23 +00:00
cd01e89852
Don't hoist instructions that define a physical register.
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llvm-svn: 55074
2008-08-20 20:32:05 +00:00
cf596eb12f
Don't hoist instructions that have implicit uses or defines. Before, it was
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hoisting out some "test" and "cmp" instructions. This was obvious badness.
llvm-svn: 54908
2008-08-18 00:33:49 +00:00
ecf34435f4
Prevent option name conflict.
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llvm-svn: 53166
2008-07-07 05:42:27 +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
2930845065
Revert the previous commit. Go ahead and hoist rematerializable instructions.
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llvm-svn: 50990
2008-05-12 19:47:18 +00:00
70613b84da
One real change - don't hoist something that's trivially rematerializable. It's
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possible for it to produce worse code than before.
The rest of this patch is code cleanup.
llvm-svn: 50987
2008-05-12 19:38:32 +00:00
2823eaebe8
Minor cleanup. No functionality change.
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llvm-svn: 48142
2008-03-10 08:13:01 +00:00
d7a258d325
Rename PrintableName to Name.
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llvm-svn: 47629
2008-02-26 21:47:57 +00:00
c24ea4fb41
Change "Name" to "AsmName" in the target register info. Gee, a refactoring tool
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would have been a Godsend here!
llvm-svn: 47625
2008-02-26 21:11:01 +00:00
3a4be0fdef
Rename MRegisterInfo to TargetRegisterInfo.
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llvm-svn: 46930
2008-02-10 18:45:23 +00:00
c8226f32e9
Simplify the side effect stuff a bit more and make licm/sinking
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both work right according to the new flags.
This removes the TII::isReallySideEffectFree predicate, and adds
TII::isInvariantLoad.
It removes NeverHasSideEffects+MayHaveSideEffects and adds
UnmodeledSideEffects as machine instr flags. Now the clients
can decide everything they need.
I think isRematerializable can be implemented in terms of the
flags we have now, though I will let others tackle that.
llvm-svn: 45843
2008-01-10 23:08:24 +00:00
03ad885039
rename TargetInstrDescriptor -> TargetInstrDesc.
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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
a98c679de0
Rename MachineInstr::getInstrDescriptor -> getDesc(), which reflects
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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
3bf5603ce4
Add that this preserves some analyses.
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llvm-svn: 45573
2008-01-04 08:48:49 +00:00
66470d02c3
Move option to enable machine LICM into LLVMTargetMachine.cpp.
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llvm-svn: 45572
2008-01-04 08:11:03 +00:00
d865697016
Call the parent's getAnalysisUsage.
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llvm-svn: 45571
2008-01-04 07:50:05 +00:00
b5c1d9b7da
remove dead #includes and reorder the rest.
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llvm-svn: 45569
2008-01-04 06:41:45 +00:00
0ba4184404
Use the correct MachineRegisterInfo object.
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llvm-svn: 45499
2008-01-02 21:10:54 +00:00
f0b37780ca
Remove dead code.
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llvm-svn: 45496
2008-01-02 20:47:37 +00:00
5da1945cdd
Use the new architecture to get the containing machine basic block for a machine
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instruction. Also, use "splice" to move the new instruction instead of
remove/insert (where it was leaking memory anyway).
llvm-svn: 45492
2008-01-02 19:32:43 +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
65c001e6bc
Updated comments to reflect what "side effects" means in this situation.
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llvm-svn: 45245
2007-12-20 01:08:10 +00:00
166f746246
Add debugging info. Use the newly created "hasUnmodelledSideEffects" method.
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llvm-svn: 45178
2007-12-18 21:38:04 +00:00
38236ef6cb
Need to grow the indexed map. Added debug statements.
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llvm-svn: 44892
2007-12-11 23:27:51 +00:00
642e15a7cb
Simplify slightly.
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llvm-svn: 44881
2007-12-11 22:22:22 +00:00
b678ae7c38
Blark! How in the world did this work without this?!
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llvm-svn: 44874
2007-12-11 19:40:06 +00:00
7717a8a37d
- Update the virtual reg to machine instruction map when hoisting.
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- Fix subtle bug when creating initially creating this map.
llvm-svn: 44873
2007-12-11 19:17:04 +00:00
Dan Gohman