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385 Commits

Author SHA1 Message Date
Dan Gohman
6d082aec26 When merging MustAlias and PartialAlias, chose PartialAlias instead 
of conservatively choosing MayAlias.

llvm-svn: 132579
 2011-06-03 20:17:36 +00:00
Dan Gohman
5b2ad67709 Make DecomposeGEPExpression check SimplifyInstruction only 
after checking for a GEP, so that it matches what GetUnderlyingObject
does. This fixes an obscure bug turned up by bugpoint in the testcase
for PR9931.

llvm-svn: 131971
 2011-05-24 18:24:08 +00:00
Chris Lattner
6830c25f35 I missed a checking with my GVN change. 
llvm-svn: 131851
 2011-05-22 07:20:02 +00:00
Duncan Sands
c228e6bdea Revert commit 131781, to see if it fixes the x86-64 dragonegg buildbot. 
Original log message:
When BasicAA can determine that two pointers have the same base but
differ by a dynamic offset, return PartialAlias instead of MayAlias.
See the comment in the code for details. This fixes PR9971.

llvm-svn: 131809
 2011-05-21 20:54:46 +00:00
Dan Gohman
048c261e5d When BasicAA can determine that two pointers have the same base but 
differ by a dynamic offset, return PartialAlias instead of MayAlias.
See the comment in the code for details. This fixes PR9971.

llvm-svn: 131781
 2011-05-21 01:05:08 +00:00
Dan Gohman
4e15bcfe01 Teach BasicAA about arm.neon.vld1 and vst1. 
llvm-svn: 130327
 2011-04-27 20:44:28 +00:00
Dan Gohman
d96c818dd2 When analyzing functions known to only access argument pointees, 
only check arguments with pointer types. Update the documentation
of IntrReadArgMem reflect this.

While here, add support for TBAA tags on intrinsic calls.

llvm-svn: 130317
 2011-04-27 18:39:03 +00:00
Andrew Trick
cef977b295 Test case and comment for PR9633. 
llvm-svn: 130294
 2011-04-27 05:42:17 +00:00
Benjamin Kramer
b2992c34b5 Make tests more useful. 
lit needs a linter ...

llvm-svn: 130126
 2011-04-25 10:12:01 +00:00
Eli Friedman
b0e846a68c PR9634: Don't unconditionally tell the AliasSetTracker that the PreheaderLoad 
is equivalent to any other relevant value; it isn't true in general.
If it is equivalent, the LoopPromoter will tell the AST the equivalence.
Also, delete the PreheaderLoad if it is unused.

Chris, since you were the last one to make major changes here, can you check
that this is sane?

llvm-svn: 129049
 2011-04-07 01:35:06 +00:00
Chris Lattner
a2345ee59d remove postdom frontiers, because it is dead. Forward dom frontiers are 
still used by RegionInfo :(

llvm-svn: 128943
 2011-04-05 21:57:17 +00:00
Anders Carlsson
8681fe2359 Revert r128140 for now. 
llvm-svn: 128149
 2011-03-23 15:51:12 +00:00
Anders Carlsson
556ad25dec A global variable with internal linkage where all uses are in one function and whose address is never taken is a non-escaping local object and can't alias anything else. 
llvm-svn: 128140
 2011-03-23 02:19:48 +00:00
Andrew Trick
5c8b815e5f Propagate SCEV no-wrap flags whenever possible. 
This needs review.

llvm-svn: 127638
 2011-03-15 00:37:00 +00:00
Andrew Trick
c4703f6ea1 When SCEV can determine the loop test is X < X, set ExactBECount=0. 
When ExactBECount is a constant, use it for MaxBECount.
When MaxBECount cannot be computed, replace it with ExactBECount.
Fixes PR9424.

llvm-svn: 127342
 2011-03-09 17:29:58 +00:00
Chris Lattner
2596ac19b9 teach SCEV that the scale and addition of an inbounds gep don't NSW. 
This fixes a FIXME in scev-aa.ll (allowing a new no-alias result) and
generally makes things more precise.

llvm-svn: 125449
 2011-02-13 03:14:49 +00:00
Chris Lattner
fec8b6bd6d Per discussion with Dan G, inbounds geps *certainly* can have 
unsigned overflow (e.g. "gep P, -1"), and while they can have
signed wrap in theoretical situations, modelling an AddRec as
not having signed wrap is going enough for any case we can 
think of today.  In the future if this isn't enough, we can
revisit this.  Modeling them as having NUW isn't causing any
known problems either FWIW.

llvm-svn: 125410
 2011-02-11 21:43:33 +00:00
Dan Gohman
6f83adb763 Add another rdar number. 
llvm-svn: 124125
 2011-01-24 17:54:01 +00:00
Nick Lewycky
13a2b8281f Simplify some code with no functionality change. Make the test a lot more 
robust against smarter optimizations, using the power of FileCheck.

llvm-svn: 124081
 2011-01-23 20:06:05 +00:00
Nick Lewycky
2503c9f9c8 Use value ranges to fold ext(trunc) in SCEV when possible. 
llvm-svn: 124062
 2011-01-23 06:20:19 +00:00
Tobias Grosser
ea8985cc25 Implement requiredTransitive 
The PassManager did not implement the transitivity of requiredTransitive. This
was unnoticed since 2006.

llvm-svn: 123942
 2011-01-20 21:03:22 +00:00
Nick Lewycky
51c13384f5 Similarly, analyze truncate through multiply. 
llvm-svn: 123842
 2011-01-19 18:56:00 +00:00
Nick Lewycky
9867e58096 Add a missed SCEV fold that is required to continue analyzing the IR produced 
by indvars through the scev expander.

trunc(add x, y) --> add(trunc x, y). Currently SCEV largely folds the other way
which is probably wrong, but preserved to minimize churn. Instcombine doesn't
do this fold either, demonstrating a missed optz'n opportunity on code doing
add+trunc+add.

llvm-svn: 123838
 2011-01-19 16:59:46 +00:00
Nick Lewycky
5a538b62ca Add a missing SCEV simplification sext(zext x) --> zext x. 
llvm-svn: 123832
 2011-01-19 15:56:12 +00:00
Dan Gohman
df668227fb Teach BasicAA to return PartialAlias in cases where both pointers 
are pointing to the same object, one pointer is accessing the entire
object, and the other is access has a non-zero size. This prevents
TBAA from kicking in and saying NoAlias in such cases.

llvm-svn: 123775
 2011-01-18 21:16:06 +00:00
Eric Christopher
c6db56a31e Revert the testcase from the previous reverted commit. 
llvm-svn: 123227
 2011-01-11 09:20:44 +00:00
Chris Lattner
749f1eff13 add a testcase I missed in previous commit. 
llvm-svn: 123143
 2011-01-09 23:52:31 +00:00
Chris Lattner
57e9b35653 teach SCEV analysis of PHI nodes that PHI recurences formed 
with GEP instructions are always NUW, because PHIs cannot wrap
the end of the address space.

llvm-svn: 123105
 2011-01-09 02:28:48 +00:00
Chris Lattner
fa37cac39c reduce indentation. Print <nuw> and <nsw> when dumping SCEV AddRec's 
that have the bit set.

llvm-svn: 123104
 2011-01-09 02:16:18 +00:00
Chris Lattner
a7735a573d fix rdar://8813415 - a miscompilation of 164.gzip that loop-idiom 
exposed.  It turns out to be a latent bug in basicaa, scary.

llvm-svn: 122772
 2011-01-03 21:03:33 +00:00
Chris Lattner
76b74870be filecheckize 
llvm-svn: 122771
 2011-01-03 21:01:26 +00:00
Dan Gohman
29a260015a -enable-tbaa is on by default now. 
llvm-svn: 121945
 2010-12-16 02:53:48 +00:00
Dan Gohman
e106936414 Make memcpyopt TBAA-aware. 
llvm-svn: 121944
 2010-12-16 02:51:19 +00:00
Duncan Sands
2699fb1072 Move Sub simplifications and additional Add simplifications out of 
instcombine and into InstructionSimplify.

llvm-svn: 121861
 2010-12-15 14:07:39 +00:00
Dan Gohman
b187cce266 Reapply r121520, PartialAlias implementation for BasicAA, now that 
memdep is updated to handle it.

llvm-svn: 121725
 2010-12-13 22:50:24 +00:00
Dan Gohman
18e2a55c07 Revert r121520, which may have introduced miscompilations. 
llvm-svn: 121573
 2010-12-10 21:48:28 +00:00
Dan Gohman
d1bf1d8013 Implement PartialAlias checking in BasicAA. 
llvm-svn: 121520
 2010-12-10 20:47:03 +00:00
Chris Lattner
191aa08db1 remove fixme comment too. 
llvm-svn: 120493
 2010-11-30 23:25:01 +00:00
Chris Lattner
eee2bb2ff0 check in *all* files. This is now handled by my previous DSE commit. 
llvm-svn: 120492
 2010-11-30 23:23:59 +00:00
NAKAMURA Takumi
fc880d67f7 test: Check the feature 'loadable_module' with load modules in %llvmshlibdir. 
%llvmshlibdir should be 'bin' on Cygming.

llvm-svn: 120282
 2010-11-29 07:58:32 +00:00
Dan Gohman
139b090e0e Delete unneeded ssp attributes. 
llvm-svn: 118836
 2010-11-11 21:08:46 +00:00
Dan Gohman
7c6a63aea3 TBAA-enable ArgumentPromotion. 
llvm-svn: 118804
 2010-11-11 18:09:32 +00:00
Dan Gohman
01ed16d764 Make Sink tbaa-aware. 
llvm-svn: 118788
 2010-11-11 16:21:47 +00:00
Dan Gohman
2ffc9c8de3 Add a testcase which demonstrates alias analysis pass precedence. 
llvm-svn: 118755
 2010-11-11 01:03:30 +00:00
Dan Gohman
aef3e95364 Fully invalidate cached results when a prior query's size or 
type is insufficient for, or incompatible with, the current query.

llvm-svn: 118721
 2010-11-10 21:45:11 +00:00
Dan Gohman
a42f6c32a3 Teach FunctionAttrs about the VAArg instruction. 
llvm-svn: 118627
 2010-11-09 20:17:38 +00:00
Dan Gohman
cee4cb4b0a Add a testcase for a call which BasicAA says only accesses memory through 
its arguments and which TBAA says doesn't write to memory.

llvm-svn: 118439
 2010-11-08 20:20:11 +00:00
Dan Gohman
c04ed6e5da Make FunctionAttrs TBAA-aware. 
llvm-svn: 118417
 2010-11-08 17:12:04 +00:00
Dan Gohman
753c9ce807 Teach memdep to use pointsToConstantMemory to determine that loads 
from constant memory don't alias any stores.

llvm-svn: 117636
 2010-10-29 01:14:04 +00:00
Dan Gohman
a592a0f539 Add a basic testcase for TBAA-aware DSE. 
llvm-svn: 117632
 2010-10-29 00:54:02 +00:00
Dan Gohman
afaaf2f56b Add some comments. 
llvm-svn: 116957
 2010-10-20 22:04:02 +00:00
Dan Gohman
6efd04961b Don't pass the raw invalid pointer used to represent conflicting 
TBAA information to AliasAnalysis.

llvm-svn: 116751
 2010-10-18 21:28:00 +00:00
Dan Gohman
ed8fc1b23f Add a basic testcase for TBAA-aware LICM. 
llvm-svn: 116745
 2010-10-18 21:00:09 +00:00
Dan Gohman
2427af80d1 Run tbaa before basicaa, since that's how it's expected to be used. 
llvm-svn: 116731
 2010-10-18 18:45:59 +00:00
Dan Gohman
7820328076 Make TypeBasedAliasAnalysis default to doing nothing, with a command-line 
option to enable it.

llvm-svn: 116722
 2010-10-18 18:17:47 +00:00
Dan Gohman
6aff5b94ff Make BasicAliasAnalysis a normal AliasAnalysis implementation which 
does normal initialization and normal chaining. Change the default
AliasAnalysis implementation to NoAlias.

Update StandardCompileOpts.h and friends to explicitly request
BasicAliasAnalysis.

Update tests to explicitly request -basicaa.

llvm-svn: 116720
 2010-10-18 18:04:47 +00:00
Dan Gohman
8dc9781a91 Add a simple testcase for tbaa. 
llvm-svn: 116272
 2010-10-11 23:54:13 +00:00
Benjamin Kramer
caacff25e4 Remove PointerTracking tests. 
llvm-svn: 115072
 2010-09-29 19:20:35 +00:00
Eli Friedman
b5aea103fc PR7959: Handle negative scales in GEPs correctly in BasicAA for non-64-bit 
targets.

llvm-svn: 114015
 2010-09-15 20:08:03 +00:00
Chris Lattner
238f46d92e remove some noise from tests. 
llvm-svn: 112889
 2010-09-02 22:35:33 +00:00
Michael J. Spencer
2f463fc492 Fix constant-over-index.ll test on windows. 
llvm-svn: 112483
 2010-08-30 15:08:02 +00:00
Chris Lattner
7663b66c31 refix PR1143 by making basicaa analyze zexts of indices aggresively, 
which I broke with a recent patch.

llvm-svn: 111452
 2010-08-18 23:09:49 +00:00
Chris Lattner
b4602679d7 fix a buggy test 
llvm-svn: 111354
 2010-08-18 04:55:12 +00:00
Chris Lattner
49d0f29752 fix PR7589: In brief: 
gep P, (zext x) != gep P, (sext x)

DecomposeGEPExpression was getting this wrong, confusing
basicaa.

llvm-svn: 111352
 2010-08-18 04:28:19 +00:00
Chris Lattner
6ac971a27f filecheckize and detrivialize. 
llvm-svn: 111350
 2010-08-18 04:25:43 +00:00
Dan Gohman
603e66618f When analyzing loop exit conditions combined with and and or, don't 
make any assumptions about when the two conditions will agree on when
to permit the loop to exit. This fixes PR7845.

llvm-svn: 110758
 2010-08-11 00:12:36 +00:00
Tobias Grosser
7b96737b7f RegionInfo: Do not assert if a BB is not part of the dominance tree. 
llvm-svn: 110665
 2010-08-10 09:54:35 +00:00
Dan Gohman
da3f592fb3 Implement a proper getModRefInfo for va_arg. 
llvm-svn: 110458
 2010-08-06 18:24:38 +00:00
Dan Gohman
9135b410fe Implement AccessesArguments checking in the two-callsite form 
of BasicAA::getModRefInfo. This allows BasicAA to say that two
memset calls to non-aliasing memory locations don't interfere.

llvm-svn: 110393
 2010-08-05 23:34:50 +00:00
Dan Gohman
7260387710 Fix memdep's code for reasoning about dependences between two calls. A Ref 
response from getModRefInfo is not useful here. Instead, check for identical
calls only in the NoModRef case.

Reapply r110270, and strengthen it to compensate for the memdep changes.
When both calls are readonly, there is no dependence between them.

llvm-svn: 110382
 2010-08-05 22:09:15 +00:00
Dan Gohman
c42ed0aa91 Revert r110270 for now. It appears to uncover a memdep bug. 
llvm-svn: 110293
 2010-08-05 00:43:10 +00:00
Dan Gohman
fc6b043376 The trouble with testing for "ModRef" and "NoModRef" is that 
one is a suffix of the other, and FileCheck accepts superstrings.
Adjust the output to avoid this problem.

llvm-svn: 110280
 2010-08-04 23:37:55 +00:00
Dan Gohman
dcb6099f9e The two-callsite form of AliasAnalysis::getModRefInfo is documented 
to return Ref if the left callsite only reads memory read or written
by the right callsite; fix BasicAliasAnalysis to implement this.

Add AliasAnalysisEvaluator support for testing the two-callsite
form of getModRefInfo.

llvm-svn: 110270
 2010-08-04 22:56:29 +00:00
Tobias Grosser
604a50cd71 Add new RegionInfo pass. 
The RegionInfo pass detects single entry single exit regions in a function,
where a region is defined as any subgraph that is connected to the remaining
graph at only two spots.
Furthermore an hierarchical region tree is built.
Use it by calling "opt -regions analyze" or "opt -view-regions".

llvm-svn: 109089
 2010-07-22 07:46:31 +00:00
Dan Gohman
2a08e2ce81 Remove interprocedural-basic-aa and associated code. The AliasAnalysis 
interface needs implementations to be consistent, so any code which
wants to support different semantics must use a different interface.
It's not currently worthwhile to add a new interface for this new
concept.

Document that AliasAnalysis doesn't support cross-function queries.

llvm-svn: 107776
 2010-07-07 14:27:09 +00:00
Dan Gohman
f9365363db Remove context sensitivity concerns from interprocedural-basic-aa, and 
make it more aggressive in cases where both pointers are known to live
in the same function.

llvm-svn: 107420
 2010-07-01 20:08:40 +00:00
Dan Gohman
683a9e2498 Revert the part of r107257 which introduced new logic for using 
nsw and nuw flags from IR Instructions. On further consideration,
this isn't valid.

llvm-svn: 107298
 2010-06-30 17:27:11 +00:00
Dan Gohman
6e7eecf743 Add a testcase for scev-aa's new capability. 
llvm-svn: 107258
 2010-06-30 07:17:47 +00:00
Dan Gohman
338d04a2dd Add a few more interesting testcases. 
llvm-svn: 107177
 2010-06-29 18:17:11 +00:00
Dan Gohman
37bf33ccff Add an Intraprocedural form of BasicAliasAnalysis, which aims to 
properly handles instructions and arguments defined in different
functions, or across recursive function iterations.

llvm-svn: 107109
 2010-06-29 00:50:39 +00:00
Dan Gohman
bd121d9b9f Fix Value::stripPointerCasts and BasicAA to avoid trouble on 
code in unreachable blocks, which have have use-def cycles.
This fixes PR7514.

llvm-svn: 107071
 2010-06-28 21:16:52 +00:00
Dan Gohman
a3bc6b13f7 Allow "exhaustive" trip count evaluation on phi nodes with all 
constant operands.

llvm-svn: 106537
 2010-06-22 13:15:46 +00:00
Dan Gohman
cec5b682b6 Fix ScalarEvolution's "exhaustive" trip count evaluation code to avoid 
assuming that loops are in canonical form, as ScalarEvolution doesn't
depend on LoopSimplify itself. Also, with indirectbr not all loops can
be simplified. This fixes PR7416.

llvm-svn: 106389
 2010-06-19 14:17:24 +00:00
Dan Gohman
b5ec637e57 Revert r106304 (105548 and friends), which are the SCEVComplexityCompare 
optimizations. There is still some nondeterminism remaining.

llvm-svn: 106306
 2010-06-18 19:54:20 +00:00
Dan Gohman
527b570925 Reapply 105540, 105542, and 105548, and revert r105732. 
llvm-svn: 106304
 2010-06-18 19:26:04 +00:00
Daniel Dunbar
acd46f61df Workaround SCEV non-determinism on this test, for now, to get buildbots back to 
green. Dan, please revert this once the real problem is fixed.

llvm-svn: 105732
 2010-06-09 17:54:40 +00:00
Dan Gohman
65954b2eb4 Optimize ScalarEvolution's SCEVComplexityCompare predicate: don't go 
scrounging through SCEVUnknown contents and SCEVNAryExpr operands;
instead just do a simple deterministic comparison of the precomputed
hash data.

Also, since this is more precise, it eliminates the need for the slow
N^2 duplicate detection code.

llvm-svn: 105540
 2010-06-07 19:06:13 +00:00
Dan Gohman
9c1b7fdc46 Add a comment to this test. 
llvm-svn: 102387
 2010-04-26 21:37:43 +00:00
Dan Gohman
231fe284cd ScalarEvolution support for <= and >= loops. 
Also, generalize ScalarEvolutions's min and max recognition to handle
some new forms of min and max that this change makes more common.

llvm-svn: 102234
 2010-04-24 03:09:42 +00:00
Chris Lattner
790231f95e fix some failures my callgraph dump format change broke. 
llvm-svn: 102197
 2010-04-23 18:38:40 +00:00
Dan Gohman
31d6b29bae Don't attempt to analyze values which are obviously undef. This fixes some 
assertion failures in extreme cases.

llvm-svn: 102042
 2010-04-22 01:35:11 +00:00
Dan Gohman
e87da8a25d Generalize ScalarEvolution's PHI analysis to handle loops that don't 
have preheaders or dedicated exit blocks, as clients may not otherwise
need to run LoopSimplify.

llvm-svn: 101030
 2010-04-12 07:49:36 +00:00
Dan Gohman
b2a87fa39d Pointers to zero-sized objects don't point to overlapping objects. 
llvm-svn: 100789
 2010-04-08 18:11:50 +00:00
Chris Lattner
23334439e9 add newlines at the end of files. 
llvm-svn: 100705
 2010-04-07 22:53:17 +00:00
Mon P Wang
484bbe6aa9 Reapply address space patch after fixing an issue in MemCopyOptimizer. 
Added support for address spaces and added a isVolatile field to memcpy, memmove, and memset,
e.g., llvm.memcpy.i32(i8*, i8*, i32, i32) -> llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)

llvm-svn: 100304
 2010-04-04 03:10:48 +00:00
Mon P Wang
0ccf050ca3 Revert r100191 since it breaks objc in clang 
llvm-svn: 100199
 2010-04-02 18:43:02 +00:00
Mon P Wang
a01350755e Reapply address space patch after fixing an issue in MemCopyOptimizer. 
Added support for address spaces and added a isVolatile field to memcpy, memmove, and memset,
e.g., llvm.memcpy.i32(i8*, i8*, i32, i32) -> llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)

llvm-svn: 100191
 2010-04-02 18:04:15 +00:00
Bob Wilson
aae933cc81 Revert Mon Ping's change 99928, since it broke all the llvm-gcc buildbots. 
llvm-svn: 99948
 2010-03-30 22:27:04 +00:00
Mon P Wang
9351ea594a Added support for address spaces and added a isVolatile field to memcpy, memmove, and memset, 
e.g., llvm.memcpy.i32(i8*, i8*, i32, i32) -> llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)
A update of langref will occur in a subsequent checkin.

llvm-svn: 99928
 2010-03-30 20:55:56 +00:00
Dan Gohman
a722142044 Avoid analyzing instructions in blocks not reachable from the entry block. 
They are lots of trouble, and they don't matter. This fixes PR6559.

llvm-svn: 98103
 2010-03-09 23:46:50 +00:00