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348 Commits

Author SHA1 Message Date
Rafael Espindola 7161661863 Move the loads after the calls so that the fix for 
PR10292 doesn't show that the loads don't alias
the allocas.

llvm-svn: 134852
 2011-07-09 23:53:58 +00:00
Rafael Espindola 7fbab4dcc7 Use CHECK-NEXT. 
llvm-svn: 134850
 2011-07-09 22:56:50 +00:00
Chris Lattner 8936d2bfbc Remove support for parsing the "type i32" syntax for defining a numbered 
top level type without a specified number.  This syntax isn't documented
and blocks forward progress.

llvm-svn: 133371
 2011-06-19 00:03:46 +00:00
Chris Lattner 80ed9dc9e5 rip out a ton of intrinsic modernization logic from AutoUpgrade.cpp, which is 
for pre-2.9 bitcode files.  We keep x86 unaligned loads, movnt, crc32, and the
target indep prefetch change.

As usual, updating the testsuite is a PITA.

llvm-svn: 133337
 2011-06-18 06:05:24 +00:00
Chris Lattner 5756c16cdf make the asmparser reject function and type redefinitions. 'Merging' hasn't been 
needed since llvm-gcc 3.4 days.

llvm-svn: 133248
 2011-06-17 07:06:44 +00:00
Chris Lattner def1949c00 Remove support for using "foo" as symbols instead of %"foo". This is ancient 
syntax and has been long obsolete.  As usual, updating the tests is the nasty
part of this.

llvm-svn: 133242
 2011-06-17 06:36:20 +00:00
Chris Lattner b90ed2233c manually upgrade a bunch of tests to modern syntax, and remove some that 
are either unreduced or only test old syntax.

llvm-svn: 133228
 2011-06-17 03:14:27 +00:00
John McCall 51fbfc928c Test case for r132797. 
llvm-svn: 132962
 2011-06-14 03:02:05 +00:00
Dan Gohman adf80ae9e4 Reapply r131781, now that the GVN bug with partially-aliasing loads 
is disabled.

llvm-svn: 132632
 2011-06-04 06:50:18 +00:00
Dan Gohman 43efe1c8bd Remove this test, which should have been reverted along with r131781. 
llvm-svn: 132628
 2011-06-04 06:21:23 +00:00
Dan Gohman 87fdceaf73 Revert r131781 again. Apparently there is more going on here. 
llvm-svn: 132625
 2011-06-04 05:11:22 +00:00
Dan Gohman 27b82f2f91 Reapply r131781 (revert r131809), now that some BasicAA shortcomings 
it exposed are fixed.

llvm-svn: 132611
 2011-06-04 00:46:31 +00:00
Dan Gohman fb02cec44e Fix BasicAA's recursion detection so that it doesn't pessimize 
queries in the case of a DAG, where a query reaches a node
visited earlier, but it's not on a cycle. This avoids
MayAlias results in cases where BasicAA is expected to
return MustAlias or PartialAlias in order to protect TBAA.

llvm-svn: 132609
 2011-06-04 00:31:50 +00:00
Dan Gohman 4e7e7958d7 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 0573b55c2b 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 408cfef6f0 I missed a checking with my GVN change. 
llvm-svn: 131851
 2011-05-22 07:20:02 +00:00
Duncan Sands 5ec65765e6 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 8b20187c82 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 5394c70d1e Teach BasicAA about arm.neon.vld1 and vst1. 
llvm-svn: 130327
 2011-04-27 20:44:28 +00:00
Dan Gohman 39b3a1ef7f 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 01eff820ae Test case and comment for PR9633. 
llvm-svn: 130294
 2011-04-27 05:42:17 +00:00
Benjamin Kramer ba446cc12a Make tests more useful. 
lit needs a linter ...

llvm-svn: 130126
 2011-04-25 10:12:01 +00:00
Eli Friedman c5f22a7815 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 57ee5a5db7 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 c4f0ab397c Revert r128140 for now. 
llvm-svn: 128149
 2011-03-23 15:51:12 +00:00
Anders Carlsson 9ed8d93f55 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 f6b01ff422 Propagate SCEV no-wrap flags whenever possible. 
This needs review.

llvm-svn: 127638
 2011-03-15 00:37:00 +00:00
Andrew Trick 2afa325811 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 4f23f2be15 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 7936a8a488 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 4deda530c2 Add another rdar number. 
llvm-svn: 124125
 2011-01-24 17:54:01 +00:00
Nick Lewycky d4192f71b5 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 bc98f5b78e Use value ranges to fold ext(trunc) in SCEV when possible. 
llvm-svn: 124062
 2011-01-23 06:20:19 +00:00
Tobias Grosser f07426b40d 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 5c901f3489 Similarly, analyze truncate through multiply. 
llvm-svn: 123842
 2011-01-19 18:56:00 +00:00
Nick Lewycky 5143f0f09b 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 e9ea75e3fc Add a missing SCEV simplification sext(zext x) --> zext x. 
llvm-svn: 123832
 2011-01-19 15:56:12 +00:00
Dan Gohman 44da55b7be 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 31bb4c5811 Revert the testcase from the previous reverted commit. 
llvm-svn: 123227
 2011-01-11 09:20:44 +00:00
Chris Lattner 1032965cbe add a testcase I missed in previous commit. 
llvm-svn: 123143
 2011-01-09 23:52:31 +00:00
Chris Lattner 10223a3fbf 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 a337f5ec5c 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 16e42128c2 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 12fa3c6a94 filecheckize 
llvm-svn: 122771
 2011-01-03 21:01:26 +00:00
Dan Gohman 189508c4c5 -enable-tbaa is on by default now. 
llvm-svn: 121945
 2010-12-16 02:53:48 +00:00
Dan Gohman e1a17a3473 Make memcpyopt TBAA-aware. 
llvm-svn: 121944
 2010-12-16 02:51:19 +00:00
Duncan Sands 0a2c416894 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 c4bf5cac9f 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 39de62348f Revert r121520, which may have introduced miscompilations. 
llvm-svn: 121573
 2010-12-10 21:48:28 +00:00
Dan Gohman 041f74e762 Implement PartialAlias checking in BasicAA. 
llvm-svn: 121520
 2010-12-10 20:47:03 +00:00