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Author SHA1 Message Date
Chris Lattner
37ff3c0ed1 switch GVN to use SSAUpdater. Besides removing a lot of complexity 
from GVN, this also speeds it up, inserts fewer PHI nodes (see the
testcase) and allows it to remove more loads (due to fewer PHI nodes
standing in the way).

llvm-svn: 83746
 2009-10-10 23:50:30 +00:00
Chris Lattner
0aa320ae4d add a simple helper method. 
llvm-svn: 83745
 2009-10-10 23:41:48 +00:00
Chris Lattner
acf73d9839 add ability for clients of SSAUpdater to find out about the 
PHI nodes inserted.

llvm-svn: 83744
 2009-10-10 23:15:24 +00:00
Chris Lattner
10b6af716f clarify 
llvm-svn: 83743
 2009-10-10 23:05:42 +00:00
Chris Lattner
31d3137c01 remove dead code 
llvm-svn: 83742
 2009-10-10 23:04:12 +00:00
Chris Lattner
db4d523cca add the ability to get a rewritten value from the middle of a block, 
not just at the end.  Add a big comment explaining when this could
be useful (which never happens for jump threading).

llvm-svn: 83741
 2009-10-10 23:00:11 +00:00
Chris Lattner
9899ce267c rename GetValueInBlock -> GetValueAtEndOfBlock to better reflect 
what it does.

llvm-svn: 83740
 2009-10-10 22:41:58 +00:00
Anton Korobeynikov
1f9ff55cbc It seems that OR operation does not affect status reg at all. 
Remove impdef of SRW. This fixes PR4779

llvm-svn: 83739
 2009-10-10 22:17:47 +00:00
Chris Lattner
ce616c28ef fix broken link 
llvm-svn: 83738
 2009-10-10 22:15:25 +00:00
Chris Lattner
330bc88468 final changes. 
llvm-svn: 83737
 2009-10-10 22:13:38 +00:00
Chris Lattner
e584af1294 down to 'major changes' 
llvm-svn: 83736
 2009-10-10 22:02:58 +00:00
Chris Lattner
e747b10bc3 more updates 
llvm-svn: 83735
 2009-10-10 21:40:13 +00:00
Chris Lattner
513fd3ac2b add a link to the GSG for info on how to check out svn trunk 
llvm-svn: 83734
 2009-10-10 21:37:16 +00:00
Chris Lattner
a9d2468440 x86 uses 5 operands for most memory refs now. 
llvm-svn: 83733
 2009-10-10 21:30:55 +00:00
Duncan Sands
9a6f3eb8ae More spelling and grammar tweaks. 
llvm-svn: 83728
 2009-10-10 20:06:04 +00:00
Benjamin Kramer
453e8ae2be More spelling fixes. 
llvm-svn: 83724
 2009-10-10 19:45:13 +00:00
Duncan Sands
4e12fa3691 Spelling fixes. 
llvm-svn: 83722
 2009-10-10 19:30:16 +00:00
Chris Lattner
074b4dee13 more tweaks 
llvm-svn: 83721
 2009-10-10 19:26:21 +00:00
Duncan Sands
bf2f32c08b Remove an inappropriate line in the description of the 
clang static analyser.  Decrease duplication in the text.

llvm-svn: 83720
 2009-10-10 19:16:25 +00:00
Chris Lattner
8f7bd86796 continue decoding chris scribble. 
llvm-svn: 83719
 2009-10-10 19:00:55 +00:00
Chris Lattner
3c9d2553e9 remove some dead passes 
llvm-svn: 83717
 2009-10-10 18:40:48 +00:00
Chris Lattner
42f4178529 checkpoint. 
llvm-svn: 83716
 2009-10-10 18:33:13 +00:00
Chris Lattner
1f970dea03 fix broken anchors. 
llvm-svn: 83715
 2009-10-10 18:26:06 +00:00
Chris Lattner
0561804097 use a typedef instead of spelling out an insane type. Yay for auto someday. 
llvm-svn: 83707
 2009-10-10 09:09:20 +00:00
Chris Lattner
75e5de9243 Change jump threading to use the new SSAUpdater class instead of 
DemoteRegToStack.  This makes it more efficient (because it isn't
creating a ton of load/stores that are eventually removed by a later
mem2reg), and more slightly more effective (because those load/stores
don't get in the way of threading).

llvm-svn: 83706
 2009-10-10 09:05:58 +00:00
Chris Lattner
9c5aa00411 Implement an efficient and fully general SSA update mechanism that 
works on unstructured CFGs.  This implements PR217, our oldest open PR.

llvm-svn: 83705
 2009-10-10 09:04:27 +00:00
Chris Lattner
54621efc37 add some WeakVH::operator='s. Without these, assigning 
a Value* to a WeakVH was constructing a temporary WeakVH
(due to the implicit assignment operator).  This avoids
that cost.

llvm-svn: 83704
 2009-10-10 08:27:29 +00:00
Chris Lattner
70895041a7 change some static_cast into cast, pointed out by Gabor. 
llvm-svn: 83703
 2009-10-10 08:01:27 +00:00
Chris Lattner
76985b43e3 add a version of PHINode::getIncomingBlock that takes a raw 
Use, to complement the version that takes a use_iterator.

llvm-svn: 83702
 2009-10-10 07:42:42 +00:00
Chris Lattner
317eb8ff20 random tidying 
llvm-svn: 83701
 2009-10-10 06:22:45 +00:00
Dan Gohman
605f85e0e6 Create a new InstrEmitter class for translating SelectionDAG nodes 
into MachineInstrs. This is mostly just moving the code from
ScheduleDAGSDNodesEmit.cpp into a new class. This decouples MachineInstr
emitting from scheduling.

llvm-svn: 83699
 2009-10-10 01:32:21 +00:00
Dan Gohman
3b025b778b Make getMachineNode return a MachineSDNode* instead of a generic SDNode* 
since it won't do any folding. This will help avoid some inconvenient
casting.

llvm-svn: 83698
 2009-10-10 01:29:16 +00:00
Dan Gohman
84a61978de Remove a no-longer-necessary #include. 
llvm-svn: 83697
 2009-10-10 00:36:09 +00:00
Dan Gohman
177b8de981 Replace X86's CanRematLoadWithDispOperand by calling the target-independent 
MachineInstr::isInvariantLoad instead, which has the benefit of being
more complete.

llvm-svn: 83696
 2009-10-10 00:34:18 +00:00
Dan Gohman
b98d95f4f9 Fix a missing initialization of PostRAScheduler's AA member. 
llvm-svn: 83695
 2009-10-10 00:15:38 +00:00
Dan Gohman
5141b26ffa The ScheduleDAG framework now requires an AliasAnalysis argument, though 
it isn't needed in the ScheduleDAGSDNodes schedulers.

llvm-svn: 83691
 2009-10-09 23:33:48 +00:00
Dan Gohman
b535009219 Update this test; the code is the same but it gets counted as one 
fewer remat.

llvm-svn: 83690
 2009-10-09 23:31:04 +00:00
Dan Gohman
168ae2c7d5 Mark the LDR instruction with isReMaterializable, as it is rematerializable 
when loading from an invariant memory location.

llvm-svn: 83688
 2009-10-09 23:28:27 +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
Devang Patel
c97c44b584 Extract scope information from the variable itself, instead of relying on alloca or llvm.dbg.declare location. 
While recording beginning of a function, use scope info from the first location entry instead of just relying on first location entry itself.

llvm-svn: 83684
 2009-10-09 22:42:28 +00:00
Jeffrey Yasskin
7edab17bef ExecutionEngine::clearGlobalMappingsFromModule failed to remove reverse 
mappings, which could cause errors and assert-failures.  This patch fixes that,
adds a test, and refactors the global-mapping-removal code into a single place.

llvm-svn: 83678
 2009-10-09 22:10:27 +00:00
Dan Gohman
14aaff93fc Add a const qualifier. 
llvm-svn: 83677
 2009-10-09 22:09:05 +00:00
Dale Johannesen
7691b73da0 Use names instead of numbers for some of the magic 
constants used in inlining heuristics (especially
those used in more than one file).  No functional change.

llvm-svn: 83675
 2009-10-09 21:42:02 +00:00
Kevin Enderby
430e05312d Added another bit of the ARM target assembler to llvm-mc to parse register 
lists.  Changed ARMAsmParser::MatchRegisterName to return -1 instead of 0 on
errors so 0-15 values could be returned as register numbers.  Also added the
rest of the arm register names to the currently hacked up version to allow more
testing.  Some changes to ARMAsmParser::ParseOperand to give different errors
for things not yet supported and some additions to the hacked
ARMAsmParser::MatchInstruction to allow more testing for now.

llvm-svn: 83673
 2009-10-09 21:12:28 +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
Dan Gohman
f2ae9c6220 Fix the x86 test-shrink optimization so that it doesn't shrink comparisons 
when one of the bits being tested would end up being the sign bit in the
narrower type, and a signed comparison is being performed, since this would
change the result of the signed comparison. This fixes PR5132.

llvm-svn: 83670
 2009-10-09 20:35:19 +00:00
Bob Wilson
011e458c11 Merge a bunch of NEON tests into larger files so they run faster. 
llvm-svn: 83667
 2009-10-09 20:20:54 +00:00
Dan Gohman
4fe1a982ed Add basic infrastructure and x86 support for preserving MachineMemOperand 
information when unfolding memory references.

llvm-svn: 83656
 2009-10-09 18:10:05 +00:00
Devang Patel
a772046766 Check invalid debug info for enums. This may happen when underlyng enum is optimized away. Eventually DwarfChecker will clean this up during llvm verification stage. 
llvm-svn: 83655
 2009-10-09 17:51:49 +00:00
Jim Grosbach
809d1bfdd3 when previous scratch register is killed, flag the value as no longer tracking 
llvm-svn: 83653
 2009-10-09 17:33:33 +00:00