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
5143d898c8
Checking for "zero operands" during the "CanHoistInst()" method isn't necessary
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because those with side effects will be caught by other checks in here.
Also, simplify the check for a BB in a sub loop.
llvm-svn: 44871
2007-12-11 18:45:11 +00:00
3f19dfe794
Reverting 44702. It wasn't correct to rename them.
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llvm-svn: 44727
2007-12-08 23:58:46 +00:00
2b07d8c5a0
Renaming:
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isTriviallyReMaterializable -> hasNoSideEffects
isReallyTriviallyReMaterializable -> isTriviallyReMaterializable
llvm-svn: 44702
2007-12-08 07:17:56 +00:00
4375173ba0
Incorporated comments from Evan and Chris:
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http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20071203/056043.html
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20071203/056048.html
llvm-svn: 44696
2007-12-08 01:47:01 +00:00
fb706bc52b
Initial commit of the machine code LICM pass. It successfully hoists this:
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_foo:
li r2, 0
LBB1_1: ; bb
li r5, 0
stw r5, 0(r3)
addi r2, r2, 1
addi r3, r3, 4
cmplw cr0, r2, r4
bne cr0, LBB1_1 ; bb
LBB1_2: ; return
blr
to:
_foo:
li r2, 0
li r5, 0
LBB1_1: ; bb
stw r5, 0(r3)
addi r2, r2, 1
addi r3, r3, 4
cmplw cr0, r2, r4
bne cr0, LBB1_1 ; bb
LBB1_2: ; return
blr
ZOMG!! :-)
Moar to come...
llvm-svn: 44687
2007-12-07 21:42:31 +00:00
Evan Cheng