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45 Commits

Author SHA1 Message Date
Evan Cheng
0ca6e3dba5 MachineLICM CSE should match destination register classes; avoid hoisting implicit_def's. 
llvm-svn: 65592
 2009-02-27 00:02:22 +00:00
Evan Cheng
078ac6071d Machine LICM increases register pressure and it almost always increase code size. For now, disable it for optimizing for size. 
llvm-svn: 63856
 2009-02-05 08:51:13 +00:00
Evan Cheng
5087dd8359 Teach machine licm to CSE hoisted instructions. 
llvm-svn: 63854
 2009-02-05 08:45:46 +00:00
Evan Cheng
ed9464bdec Don't call isInvariantLoad twice. 
llvm-svn: 63729
 2009-02-04 09:21:58 +00:00
Evan Cheng
d80609a7b3 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. 
llvm-svn: 63728
 2009-02-04 09:19:56 +00:00
Evan Cheng
68f918e570 For now, only hoist re-materilizable instructions. LICM will increase register pressure. We want to avoid spilling more instructions if it's possible. 
llvm-svn: 63725
 2009-02-04 07:17:49 +00:00
Dan Gohman
23a5f63b21 Simplify the MachineLICM pass by having it only traverse outer 
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
Dan Gohman
8271066844 Tidy up #includes, deleting a bunch of unnecessary #includes. 
llvm-svn: 61715
 2009-01-05 17:59:02 +00:00
Dan Gohman
1c1b281cd5 Use isTerminator() instead of isBranch()||isReturn() in 
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
Dan Gohman
fae8a30dce Give MachineLICM a name, for -time-passes etc. 
llvm-svn: 61184
 2008-12-18 01:37:56 +00:00
Dan Gohman
30c5ce1b7d Switch the MachineOperand accessors back to the short names like 
isReg, etc., from isRegister, etc.

llvm-svn: 57006
 2008-10-03 15:45:36 +00:00
Dan Gohman
e1f9be27bc Tidy up several unbeseeming casts from pointer to intptr_t. 
llvm-svn: 55779
 2008-09-04 17:05:41 +00:00
Bill Wendling
4a9ded80e2 Cosmetic changes to Machine LICM. No functionality change. 
llvm-svn: 55578
 2008-08-31 02:30:23 +00:00
Bill Wendling
42a2073ed4 Don't hoist instructions that define a physical register. 
llvm-svn: 55074
 2008-08-20 20:32:05 +00:00
Bill Wendling
12569b3697 Don't hoist instructions that have implicit uses or defines. Before, it was 
hoisting out some "test" and "cmp" instructions. This was obvious badness.

llvm-svn: 54908
 2008-08-18 00:33:49 +00:00
Bill Wendling
d6bd5ea0b7 Prevent option name conflict. 
llvm-svn: 53166
 2008-07-07 05:42:27 +00:00
Dan Gohman
bab18cae46 Clean up the use of static and anonymous namespaces. This turned up 
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
Bill Wendling
f3c4b7fbb5 Revert the previous commit. Go ahead and hoist rematerializable instructions. 
llvm-svn: 50990
 2008-05-12 19:47:18 +00:00
Bill Wendling
74cabebb44 One real change - don't hoist something that's trivially rematerializable. It's 
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
Bill Wendling
91ff268a77 Minor cleanup. No functionality change. 
llvm-svn: 48142
 2008-03-10 08:13:01 +00:00
Bill Wendling
8fb166bf6c Rename PrintableName to Name. 
llvm-svn: 47629
 2008-02-26 21:47:57 +00:00
Bill Wendling
50f5c4be14 Change "Name" to "AsmName" in the target register info. Gee, a refactoring tool 
would have been a Godsend here!

llvm-svn: 47625
 2008-02-26 21:11:01 +00:00
Dan Gohman
cabaec582f Rename MRegisterInfo to TargetRegisterInfo. 
llvm-svn: 46930
 2008-02-10 18:45:23 +00:00
Chris Lattner
bfffa4f21e Simplify the side effect stuff a bit more and make licm/sinking 
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
Chris Lattner
f83aae613c rename TargetInstrDescriptor -> TargetInstrDesc. 
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
Chris Lattner
f7f96d818f Rename MachineInstr::getInstrDescriptor -> getDesc(), which reflects 
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
Bill Wendling
2017097bb8 Add that this preserves some analyses. 
llvm-svn: 45573
 2008-01-04 08:48:49 +00:00
Bill Wendling
13eb1bfc08 Move option to enable machine LICM into LLVMTargetMachine.cpp. 
llvm-svn: 45572
 2008-01-04 08:11:03 +00:00
Bill Wendling
da5d32e248 Call the parent's getAnalysisUsage. 
llvm-svn: 45571
 2008-01-04 07:50:05 +00:00
Chris Lattner
b02b90a8f6 remove dead #includes and reorder the rest. 
llvm-svn: 45569
 2008-01-04 06:41:45 +00:00
Bill Wendling
c677923991 Use the correct MachineRegisterInfo object. 
llvm-svn: 45499
 2008-01-02 21:10:54 +00:00
Bill Wendling
005b47c20c Remove dead code. 
llvm-svn: 45496
 2008-01-02 20:47:37 +00:00
Bill Wendling
5843183ca2 Use the new architecture to get the containing machine basic block for a machine 
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
Chris Lattner
ad9a6ccb83 Remove attribution from file headers, per discussion on llvmdev. 
llvm-svn: 45418
 2007-12-29 20:36:04 +00:00
Bill Wendling
cba1938285 Updated comments to reflect what "side effects" means in this situation. 
llvm-svn: 45245
 2007-12-20 01:08:10 +00:00
Bill Wendling
fe0e399130 Add debugging info. Use the newly created "hasUnmodelledSideEffects" method. 
llvm-svn: 45178
 2007-12-18 21:38:04 +00:00
Bill Wendling
20a11adc5e Need to grow the indexed map. Added debug statements. 
llvm-svn: 44892
 2007-12-11 23:27:51 +00:00
Bill Wendling
c92c27f928 Simplify slightly. 
llvm-svn: 44881
 2007-12-11 22:22:22 +00:00
Bill Wendling
9f0bcd67cf Blark! How in the world did this work without this?! 
llvm-svn: 44874
 2007-12-11 19:40:06 +00:00
Bill Wendling
30281897da - Update the virtual reg to machine instruction map when hoisting. 
- Fix subtle bug when creating initially creating this map.

llvm-svn: 44873
 2007-12-11 19:17:04 +00:00
Bill Wendling
9f02f24469 Checking for "zero operands" during the "CanHoistInst()" method isn't necessary 
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
Bill Wendling
8d8d9a2f5e Reverting 44702. It wasn't correct to rename them. 
llvm-svn: 44727
 2007-12-08 23:58:46 +00:00
Bill Wendling
d10837def7 Renaming: 
isTriviallyReMaterializable -> hasNoSideEffects
  isReallyTriviallyReMaterializable -> isTriviallyReMaterializable

llvm-svn: 44702
 2007-12-08 07:17:56 +00:00
Bill Wendling
3c6bac9686 Incorporated comments from Evan and Chris: 
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
Bill Wendling
c08dedb060 Initial commit of the machine code LICM pass. It successfully hoists this: 
_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