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1697 Commits

Author SHA1 Message Date
Chris Lattner
7d444d0682 Rewrite the main DSE loop to be written in terms of reasoning 
about pairs of AA::Location's instead of looking for MemDep's
"Def" predicate.  This is more powerful and general, handling
memset/memcpy/store all uniformly, and implementing PR8701 and
probably obsoleting parts of memcpyoptimizer.

This also fixes an obscure bug with init.trampoline and i8
stores, but I'm not surprised it hasn't been hit yet.  Enhancing
init.trampoline to carry the size that it stores would allow
DSE to be much more aggressive about optimizing them.

llvm-svn: 120406
 2010-11-30 07:23:21 +00:00
Chris Lattner
31d8d00187 death to extraneous \n's. 
llvm-svn: 120405
 2010-11-30 07:20:51 +00:00
Chris Lattner
cbe6b88afe getLocationForDest should work for memset as well. 
llvm-svn: 120380
 2010-11-30 01:48:20 +00:00
Chris Lattner
76977cd3c8 clean up handling of 'free', detangling it from everything else. 
It can be seriously improved, but at least now it isn't intertwined
with the other logic.

llvm-svn: 120377
 2010-11-30 01:28:33 +00:00
Michael J. Spencer
d5ec932c3a Merge System into Support. 
llvm-svn: 120298
 2010-11-29 18:16:10 +00:00
Duncan Sands
97ada840ed Expand a little on the description of what InstructionSimplify does. 
llvm-svn: 120016
 2010-11-23 10:50:08 +00:00
Duncan Sands
809b3e3634 Clarify that constant folding of instructions applies when all operands 
are constant.  There was in fact one exception to this (phi nodes) - so
remove that exception (InstructionSimplify handles this so there should
be no loss).

llvm-svn: 120015
 2010-11-23 10:16:18 +00:00
Cameron Zwarich
1fa40011ae Optimize a common case in the Lengauer-Tarjan dominators algorithm. This gives a 
9.7% speedup running domtree on test-suite.

Reviewed by Chris Lattner.

llvm-svn: 120003
 2010-11-23 06:32:37 +00:00
Chris Lattner
0d1afc82b2 the getLocationForSource/Dest methods can be static. 
llvm-svn: 119929
 2010-11-21 08:05:25 +00:00
Chris Lattner
a39a40d351 add "getLocation" method to AliasAnalysis for getting the source and 
destination location of a memcpy/memmove.  I'm not clear about whether
TBAA works on these, so I'm leaving it out for now.  Dan, please revisit
this when convenient.

llvm-svn: 119928
 2010-11-21 07:51:27 +00:00
Chris Lattner
3a0edfb37c implement PR8576, deleting dead stores with intervening may-alias stores. 
llvm-svn: 119927
 2010-11-21 07:34:32 +00:00
Duncan Sands
f0b203d4a4 Simplify, no functionality change. 
llvm-svn: 119797
 2010-11-19 08:33:20 +00:00
Duncan Sands
4562d3b919 Factor code for testing whether replacing one value with another 
preserves LCSSA form out of ScalarEvolution and into the LoopInfo
class.  Use it to check that SimplifyInstruction simplifications
are not breaking LCSSA form.  Fixes PR8622.

llvm-svn: 119727
 2010-11-18 19:59:41 +00:00
Dan Gohman
ac4c387e2d Document the units for the Size field. 
llvm-svn: 119711
 2010-11-18 17:39:01 +00:00
Dan Gohman
3213622610 Introduce memoization for ScalarEvolution dominates and properlyDominates 
queries, and SCEVExpander getRelevantLoop queries.

llvm-svn: 119595
 2010-11-18 00:34:22 +00:00
Dan Gohman
ecff21cc67 Factor out the code for purging a SCEV from all the various memoization maps. 
Some of these maps may merge in the future, but for now it's convenient to have
a utility function for them.

llvm-svn: 119587
 2010-11-17 23:28:48 +00:00
Dan Gohman
8e594dfe39 Merge the implementations of isLoopInvariant and hasComputableLoopEvolution, and 
memoize the results. This improves compile time in code which highly complex
expressions which get queried many times.

llvm-svn: 119584
 2010-11-17 23:21:44 +00:00
Dan Gohman
fb6ea18d0a Make SCEV::getType() and SCEV::print non-virtual. Move SCEV::hasOperand 
to ScalarEvolution. Delete SCEV::~SCEV. SCEV is no longer virtual.

llvm-svn: 119578
 2010-11-17 22:27:42 +00:00
Dan Gohman
9bbb0fa515 Move SCEV::dominates and properlyDominates to ScalarEvolution. 
llvm-svn: 119570
 2010-11-17 21:41:58 +00:00
Dan Gohman
04df5af12b Move SCEV::isLoopInvariant and hasComputableLoopEvolution to be member 
functions of ScalarEvolution, in preparation for memoization and
other optimizations.

llvm-svn: 119562
 2010-11-17 21:23:15 +00:00
Dan Gohman
4dc0a20aea Verify SCEVAddRecExpr's invariant in ScalarEvolution::getAddRecExpr 
instead of in SCEVAddRecExpr's constructor, in preparation for an
upcoming change.

llvm-svn: 119554
 2010-11-17 20:48:38 +00:00
Dan Gohman
a585073323 Fix ScalarEvolution's range memoization to avoid using a 
default ctor with ConstantRange.

llvm-svn: 119550
 2010-11-17 20:23:08 +00:00
Duncan Sands
2bd7e7c274 Move some those Xor simplifications which don't require creating new 
instructions out of InstCombine and into InstructionSimplify.  While
there, introduce an m_AllOnes pattern to simplify matching with integers
and vectors with all bits equal to one.

llvm-svn: 119536
 2010-11-17 18:52:15 +00:00
Duncan Sands
d3c1ca1f00 Previously SimplifyInstruction could report that an instruction 
simplified to itself (this can only happen in unreachable blocks).
Change it to return null instead.  Hopefully this will fix some
buildbot failures.

llvm-svn: 119490
 2010-11-17 08:35:29 +00:00
Dan Gohman
b10ff802a0 Memoize results from ScalarEvolution's getUnsignedRange and getSignedRange. 
This fixes some extreme compile times on unrolled sha512 code.

llvm-svn: 119455
 2010-11-17 02:44:44 +00:00
Duncan Sands
825c7d7f79 In which I discover the existence of loops. Threading an operation 
over a phi node by applying it to each operand may be wrong if the
operation and the phi node are mutually interdependent (the testcase
has a simple example of this).  So only do this transform if it would
be correct to perform the operation in each predecessor of the block
containing the phi, i.e. if the other operands all dominate the phi.
This should fix the FFMPEG snow.c regression reported by İsmail Dönmez.

llvm-svn: 119347
 2010-11-16 12:16:38 +00:00
Duncan Sands
63e80e0593 If dom tree information is available, make it possible to pass 
it to get better phi node simplification.

llvm-svn: 119055
 2010-11-14 18:36:10 +00:00
Duncan Sands
ab39985d42 Strip trailing whitespace. 
llvm-svn: 119038
 2010-11-14 11:23:23 +00:00
Dan Gohman
f3bf6591e0 Add helper functions for computing the Location of load, store, 
and vaarg instructions.

llvm-svn: 118845
 2010-11-11 21:50:19 +00:00
Dan Gohman
7c06994452 Add comments. 
llvm-svn: 118799
 2010-11-11 17:33:39 +00:00
Dan Gohman
503ad44b14 Add brief doxygen comments for AliasResult enum values. 
llvm-svn: 118792
 2010-11-11 16:37:38 +00:00
Dan Gohman
b476dc0f55 Set NonLocalDepInfo's Size field to UnknownSize when invalidating 
it, so that it doesn't appear to be a known size.

llvm-svn: 118748
 2010-11-11 00:20:27 +00:00
Devang Patel
5520a6fc97 Take care of special characters while creating named MDNode name to hold function specific local variable's info. 
This fixes radar 8653152. I am checking in testcase as a separate check-in.

llvm-svn: 118726
 2010-11-10 22:19:21 +00:00
Dan Gohman
2b4e8302a6 Enhance GVN to do more precise alias queries for non-local memory 
references. For example, this allows gvn to eliminate the load in
this example:

  void foo(int n, int* p, int *q) {
    p[0] = 0;
    p[1] = 1;
    if (n) {
      *q = p[0];
    }
  }

llvm-svn: 118714
 2010-11-10 20:37:15 +00:00
Dan Gohman
04e46fa78b Rename AccessesArguments and AccessesArgumentsReadonly, and rewrite 
their comments.

llvm-svn: 118696
 2010-11-10 18:30:00 +00:00
Dan Gohman
271a238243 Fix a copy+pasto Duncan noticed. 
llvm-svn: 118693
 2010-11-10 18:18:23 +00:00
Dan Gohman
65a3841f03 Add a doesAccessArgPointees helper function, and update code to use 
it, and to be consistent.

llvm-svn: 118692
 2010-11-10 18:17:28 +00:00
Dan Gohman
9ae50022a1 Factor out the code for testing whether a function accesses 
arbitrary memory into a helper function, and adjust some comments.

llvm-svn: 118687
 2010-11-10 17:34:04 +00:00
Dan Gohman
3cc59e791f Give NonLocalDepResult a NonLocalDepEntry member, replacing 
indivudal members holding the same data, to clarify the relationship
between NonLocalDepResult and NonLocalDepEntry.

llvm-svn: 118686
 2010-11-10 17:15:52 +00:00
Dan Gohman
1571dfc883 Make ModRefBehavior a lattice. Use this to clean up AliasAnalysis 
chaining and simplify FunctionAttrs' GetModRefBehavior logic.

llvm-svn: 118660
 2010-11-10 01:02:18 +00:00
Dan Gohman
2a7e94d265 Convert comments to doxygen syntax. 
llvm-svn: 118628
 2010-11-09 20:33:57 +00:00
Dan Gohman
27fb58d9c7 AccessesArgumentsReadonly is read-only. 
llvm-svn: 118615
 2010-11-09 19:50:00 +00:00
Dan Gohman
d50f969460 Add a AccessesArgumentsReadonly ModRefBehavior value, so that the intrinsic 
property IntrReadArgMem can be modeled.

llvm-svn: 118614
 2010-11-09 19:48:55 +00:00
Dan Gohman
9bdf92c92c Factor out the logic for onlyReadsMemory into a helper function. 
llvm-svn: 118611
 2010-11-09 19:43:24 +00:00
Dan Gohman
3de0bd24db Delete AccessesArgumentsAndGlobals, which was unused. 
llvm-svn: 118610
 2010-11-09 19:41:37 +00:00
Dan Gohman
227bf9fea9 Add some comments noting some correspondences between ModRefBehavior 
values, LLVM IR function attributes, and LLVM intrinsic attributes.

llvm-svn: 118455
 2010-11-08 23:46:02 +00:00
Devang Patel
af569979a6 Document parameters. Fix typos. 
llvm-svn: 118424
 2010-11-08 18:28:34 +00:00
Dan Gohman
6909ecf66e Extend the AliasAnalysis::pointsToConstantMemory interface to allow it 
to optionally look for constant or local (alloca) memory.

Teach BasicAliasAnalysis::pointsToConstantMemory to look through Select
and Phi nodes, and to support looking for local memory.

Remove FunctionAttrs' PointsToLocalOrConstantMemory function, now that
AliasAnalysis knows all the tricks that it knew.

llvm-svn: 118412
 2010-11-08 16:45:26 +00:00
Dan Gohman
ee58dba24c Delete getIntrinsicModRefBehavior. Clients can just use the normal 
getModRefBehavior now, since it now understands intrinsics as well
as normal functions.

llvm-svn: 118411
 2010-11-08 16:11:19 +00:00
Dan Gohman
c3202f8550 Add comments. 
llvm-svn: 118408
 2010-11-08 15:34:42 +00:00