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72 Commits

Author SHA1 Message Date
David Greene
f1e49c30ee Change errs() to dbgs(). 
llvm-svn: 92547
 2010-01-05 00:03:48 +00:00
Dan Gohman
0f8f7f179d Add Loop contains utility methods for testing whether a loop 
contains another loop, or an instruction. The loop form is
substantially more efficient on large loops than the typical
code it replaces.

llvm-svn: 91654
 2009-12-18 01:24:09 +00:00
Evan Cheng
9828118adf Enable hoisting load from constant memories. 
llvm-svn: 89510
 2009-11-20 23:31:34 +00:00
Evan Cheng
92a81f9ffc Add option -licm-const-load to hoist all loads from constant memory. 
llvm-svn: 89477
 2009-11-20 19:55:37 +00:00
Jakob Stoklund Olesen
ab8e8a9bc9 Add MachineBasicBlock::getName, and use it in place of getBasicBlock()->getName. 
Fix debug code that assumes getBasicBlock never returns NULL.

llvm-svn: 89428
 2009-11-20 01:17:03 +00:00
Evan Cheng
e1439535ac Fix comment. 
llvm-svn: 89129
 2009-11-17 19:19:01 +00:00
Evan Cheng
8eaaffb9da - Add TargetInstrInfo::isIdentical(). It's similar to MachineInstr::isIdentical 
except it doesn't care if the definitions' virtual registers differ. This is
  used by machine LICM and other MI passes to perform CSE.
- Teach Thumb2InstrInfo::isIdentical() to check two t2LDRpci_pic are identical.
  Since pc relative constantpool entries are always different, this requires it
  it check if the values can actually the same.

llvm-svn: 86328
 2009-11-07 03:52:02 +00:00
Evan Cheng
3a05d1d9bb Code refactoring. 
llvm-svn: 86085
 2009-11-05 00:51:13 +00:00
Evan Cheng
d783406059 Re-apply 85799. It turns out my code isn't buggy. 
llvm-svn: 85947
 2009-11-03 21:40:02 +00:00
Evan Cheng
ca5847665b Revert 85799 for now. It might be breaking llvm-gcc driver. 
llvm-svn: 85827
 2009-11-02 21:49:14 +00:00
Evan Cheng
ec5cb0cdbd Initilize the machine LICM CSE map upon the first time an instruction is hoisted to 
the loop preheader. Add instructions which are already in the preheader block that
may be common expressions of those that are hoisted out. These does get a few more
instructions CSE'ed.

llvm-svn: 85799
 2009-11-02 08:09:49 +00:00
Dan Gohman
ad6c6a3d33 Fix MachineLICM to use the correct virtual register class when 
unfolding loads for hoisting.  getOpcodeAfterMemoryUnfold returns the
opcode of the original operation without the load, not the load
itself, MachineLICM needs to know the operand index in order to get
the correct register class. Extend getOpcodeAfterMemoryUnfold to
return this information.

llvm-svn: 85622
 2009-10-30 22:18:41 +00:00
Dan Gohman
4620ed7bb7 Refactor the code for unfolding a load into a separate function. 
llvm-svn: 85515
 2009-10-29 17:47:20 +00:00
Dan Gohman
a43a2a10a1 Simplify this code: if the unfolded load can't be hoisted, just delete 
the new instructions and leave the old one in place.

llvm-svn: 85393
 2009-10-28 15:23:36 +00:00
Dan Gohman
076a3b5e25 Teach MachineLICM to unfold loads from constant memory from 
otherwise unhoistable instructions in order to allow the loads
to be hoisted.

llvm-svn: 85364
 2009-10-28 03:21:57 +00:00
Nick Lewycky
2b8400628d Remove includes of Support/Compiler.h that are no longer needed after the 
VISIBILITY_HIDDEN removal.

llvm-svn: 85043
 2009-10-25 06:57:41 +00:00
Nick Lewycky
711c726c97 Remove VISIBILITY_HIDDEN from class/struct found inside anonymous namespaces. 
Chris claims we should never have visibility_hidden inside any .cpp file but
that's still not true even after this commit.

llvm-svn: 85042
 2009-10-25 06:33:48 +00:00
Dan Gohman
5bfc2416fe Factor out LiveIntervalAnalysis' code to determine whether an instruction 
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
Dan Gohman
3005d6bf9f isTriviallyReMaterializable checks the 
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
Evan Cheng
ec853b9ba5 Give Dan and my recent changes, machine LICM is now code size neutral. 
llvm-svn: 83624
 2009-10-09 06:31:25 +00:00
Evan Cheng
439044f330 Fix a logic error that caused non-rematable loop invariants loads to be licm'ed out of loop. 
llvm-svn: 83622
 2009-10-09 06:21:52 +00:00
Dan Gohman
b95136e649 Replace TargetInstrInfo::isInvariantLoad and its target-specific 
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
Dan Gohman
7f73a0c1e4 Don't hoist or sink instructions with physreg uses if the physreg is 
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
Dan Gohman
487152872b Unbreak MachineLICM for instructions that reference RIP on x86-64 too. 
llvm-svn: 82825
 2009-09-25 23:58:45 +00:00
Bill Wendling
6dff651660 Convert DOUT to DEBUG(errs()...). 
llvm-svn: 79754
 2009-08-22 20:25:44 +00:00
Dan Gohman
24939b2c4f Tidy #includes. 
llvm-svn: 78677
 2009-08-11 16:02:12 +00:00
Daniel Dunbar
8496064116 More migration to raw_ostream, the water has dried up around the iostream hole. 
- 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
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