f2905afe62
Do simple cross-block DSE when we encounter a free statement. Fixes PR11240.
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llvm-svn: 143808
2011-11-05 10:48:42 +00:00
e6d40de414
Speculatively revert "DeadStoreElimination can now trim the size of a store if
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the end of it is dead.", which appears to break bootstrapping LLVM.
llvm-svn: 143668
2011-11-04 00:48:26 +00:00
8a95aedb5d
DeadStoreElimination can now trim the size of a store if the end of it is dead.
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Only currently done if the later store is writing to a power of 2 address or
has the same alignment as the earlier store as then its likely to not break up
large stores into smaller ones
Fixes <rdar://problem/10140300>
llvm-svn: 143630
2011-11-03 18:01:56 +00:00
dd1d3df524
A dead malloc, a free(NULL) and a free(undef) are all trivially dead
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instructions.
This doesn't introduce any optimizations we weren't doing before (except
potentially due to pass ordering issues), now passes will eliminate them sooner
as part of their own cleanups.
llvm-svn: 142787
2011-10-24 04:35:36 +00:00
32f8051d66
A non-escaping malloc in the entry block is not unlike an alloca. Do dead-store
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elimination on them too.
llvm-svn: 142735
2011-10-22 21:59:35 +00:00
58704ee442
Try again at r138809 (make DSE more aggressive in removing dead stores at the end of a function), now with less deleting stores before memcpy's.
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llvm-svn: 139150
2011-09-06 18:14:09 +00:00
b359367a3d
Remove empty file.
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llvm-svn: 138830
2011-08-30 21:17:20 +00:00
e316e5b2ad
Speculatively revert r138809 in an attempt to fix DragonEgg.
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llvm-svn: 138829
2011-08-30 21:11:06 +00:00
d708ec4c6a
When walking backwards to eliminate final stores to allocas at the end of a function, encountering an unrelated store should not cause us to give up like encountering a load does.
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llvm-svn: 138809
2011-08-30 18:51:55 +00:00
9a468153e1
Atomic load/store handling for the passes using memdep (GVN, DSE, memcpyopt).
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llvm-svn: 137888
2011-08-17 22:22:24 +00:00
02e737b08e
Move "atomic" and "volatile" designations on instructions after the opcode
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of the instruction.
Note that this change affects the existing non-atomic load and store
instructions; the parser now accepts both forms, and the change is noted
in the release notes.
llvm-svn: 137527
2011-08-12 22:50:01 +00:00
80ed9dc9e5
rip out a ton of intrinsic modernization logic from AutoUpgrade.cpp, which is
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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
b90ed2233c
manually upgrade a bunch of tests to modern syntax, and remove some that
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are either unreduced or only test old syntax.
llvm-svn: 133228
2011-06-17 03:14:27 +00:00
026f5e61f0
fix a really nasty basicaa mod/ref calculation bug that was causing miscompilation of
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UnitTests/ObjC/messages-2.m with the recent optimizer improvements.
llvm-svn: 131897
2011-05-23 05:15:43 +00:00
5034159c5f
* The DSE code that tested for overlapping needed to take into account the fact
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that one of the numbers is signed while the other is unsigned. This could lead
to a wrong result when the signed was promoted to an unsigned int.
* Add the data layout line to the testcase so that it will test the appropriate
thing.
Patch by David Terei!
llvm-svn: 128577
2011-03-30 21:37:19 +00:00
db40b5c899
PR9561: A store with a negative offset (via GEP) could erroniously say that it
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completely overlaps a previous store, thus mistakenly deleting that store. Check
for this condition.
llvm-svn: 128319
2011-03-26 01:20:37 +00:00
94fbdf3814
Fix PR8728, a miscompilation I recently introduced. When optimizing
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memcpy's like:
memcpy(A, B)
memcpy(A, C)
we cannot delete the first memcpy as dead if A and C might be aliases.
If so, we actually get:
memcpy(A, B)
memcpy(A, A)
which is not correct to transform into:
memcpy(A, A)
This patch was heavily influenced by Jakub Staszak's patch in PR8728, thanks
Jakub!
llvm-svn: 120974
2010-12-06 01:48:06 +00:00
903add84d9
Enhance DSE to handle the variable index case in PR8657.
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llvm-svn: 120498
2010-11-30 23:43:23 +00:00
c0f3379ae0
teach DSE to use GetPointerBaseWithConstantOffset to analyze
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may-aliasing stores that partially overlap with different base
pointers. This implements PR6043 and the non-variable part of
PR8657
llvm-svn: 120485
2010-11-30 23:05:20 +00:00
b63ba73b1b
enhance isRemovable to refuse to delete volatile mem transfers
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now that DSE hacks on them. This fixes a regression I introduced,
by generalizing DSE to hack on transfers.
llvm-svn: 120445
2010-11-30 19:12:10 +00:00
58b779e9c2
Rewrite the main DSE loop to be written in terms of reasoning
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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
c2e3445273
merge one more away
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llvm-svn: 120375
2010-11-30 01:06:43 +00:00
7578d0df51
I already merged partial-overwrite.ll -> PartialStore.ll
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Merge context-sensitive.ll -> simple.ll and upgrade it.
llvm-svn: 120374
2010-11-30 01:05:07 +00:00
43e3a98675
clean up DSE tests, removing some poorly reduced and useless old test,
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merging more into other larger .ll files, filecheckizing along the way.
llvm-svn: 120373
2010-11-30 01:00:34 +00:00
90c4947df7
enhance basicaa to return "Mod" for a memcpy call when the
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queried location doesn't overlap the source, and add a testcase.
llvm-svn: 120370
2010-11-30 00:43:16 +00:00
9a146372b5
Teach basicaa that memset's modref set is at worst "mod" and never
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contains "ref".
Enhance DSE to use a modref query instead of a store-specific hack
to generalize the "ignore may-alias stores" optimization to handle
memset and memcpy.
llvm-svn: 120368
2010-11-30 00:28:45 +00:00
c3c754f750
my previous patch would cause us to start deleting some volatile
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stores, fix and add a testcase.
llvm-svn: 120363
2010-11-30 00:12:39 +00:00
e6840ef4b3
Fix some broken CHECK lines.
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llvm-svn: 120332
2010-11-29 22:34:55 +00:00
2e8793482c
fix PR8677, patch by Jakub Staszak!
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llvm-svn: 120325
2010-11-29 21:59:31 +00:00
e48c31ce33
implement PR8576, deleting dead stores with intervening may-alias stores.
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llvm-svn: 119927
2010-11-21 07:34:32 +00:00
6e22221b37
file checkize
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llvm-svn: 119926
2010-11-21 07:32:40 +00:00
d4b7fff2e8
Enhance DSE to handle the case where a free call makes more than
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one store dead. This is especially noticeable in
SingleSource/Benchmarks/Shootout/objinst.
llvm-svn: 118875
2010-11-12 02:19:17 +00:00
620c38f030
Filecheckize.
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llvm-svn: 118874
2010-11-12 02:02:39 +00:00
02538ac4d3
Make BasicAliasAnalysis a normal AliasAnalysis implementation which
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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
3ae2dd2ba5
add newlines at the end of files.
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llvm-svn: 100705
2010-04-07 22:53:17 +00:00
c053cbbc4d
Make DSE only scan blocks that are reachable from the entry
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block. Other blocks may have pointer cycles that will crash
basicaa and other alias analyses. In any case, there is no
point wasting cycles optimizing dead blocks. This fixes
rdar://7635088
llvm-svn: 95852
2010-02-11 05:11:54 +00:00
fb4193625a
Delete useless trailing semicolons.
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llvm-svn: 92740
2010-01-05 17:55:26 +00:00
401e6093c9
Fix some CHECK lines which were ignored by accident.
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llvm-svn: 91214
2009-12-12 09:25:50 +00:00
b9878ee6b6
Cleanup/remove some parts of the lifetime region handling code in memdep and GVN,
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per Chris' comments. Adjust testcases to match.
llvm-svn: 90304
2009-12-02 07:35:19 +00:00
218a3393f4
Teach memdep to look for memory use intrinsics during dependency queries. Fixes
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PR5574.
llvm-svn: 90045
2009-11-28 21:27:49 +00:00
c7bc66dfc6
implement a FIXME: limit the depth that DecomposeGEPExpression goes the same
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way that getUnderlyingObject does it.
This fixes the 'DecomposeGEPExpression and getUnderlyingObject disagree!'
assertion on sqlite3.
llvm-svn: 90038
2009-11-28 15:12:41 +00:00
c53e2ecf02
Teach BasicAA that a constant expression can't alias memory provably not
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allocated until runtime (such as an alloca). Patch by Hans Wennborg!
llvm-svn: 88760
2009-11-14 06:15:14 +00:00
1925d3a1d1
Teach DSE to eliminate useless trampolines.
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llvm-svn: 86683
2009-11-10 13:49:50 +00:00
9027147fb1
Reapply r86359, "Teach dead store elimination that certain intrinsics write to
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memory just like a store" with bug fixed (partial-overwrite.ll is the
regression test).
llvm-svn: 86667
2009-11-10 06:46:40 +00:00
acc83d10bd
remove empty files.
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llvm-svn: 86392
2009-11-07 18:03:32 +00:00
431000da21
Revert r86359, it is breaking the self host on the
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llvm-gcc-i386-darwin9 build bot.
llvm-svn: 86391
2009-11-07 17:59:32 +00:00
b6a3dd48f4
Teach dead store elimination that certain intrinsics write to memory just like
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a store.
llvm-svn: 86359
2009-11-07 08:34:40 +00:00
a09062758b
improve DSE when TargetData is not around, based on work by
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Hans Wennborg!
llvm-svn: 86067
2009-11-04 23:20:12 +00:00
90fedc6ef9
Make opt default to not adding a target data string and update tests that depend on target data to supply it within the test
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llvm-svn: 85900
2009-11-03 15:29:06 +00:00
2b2bd28973
Treat lifetime begin/end markers as allocations/frees respectively for the
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purposes for GVN/DSE.
llvm-svn: 85383
2009-10-28 07:05:35 +00:00
1880092722
Change tests from "opt %s" to "opt < %s" so that opt doesn't see the
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input filename so that opt doesn't print the input filename in the
output so that grep lines in the tests don't unintentionally match
strings in the input filename.
llvm-svn: 81537
2009-09-11 18:01:28 +00:00
72a13d2476
Use opt -S instead of piping bitcode output through llvm-dis.
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llvm-svn: 81257
2009-09-08 22:34:10 +00:00
9737a63ed8
Change these tests to feed the assembly files to opt directly, instead
...
of using llvm-as, now that opt supports this.
llvm-svn: 81226
2009-09-08 16:50:01 +00:00
4916267c97
fix PR4815: some cases where DeleteDeadInstruction can delete
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the instruction BBI points to.
llvm-svn: 80768
2009-09-02 06:31:02 +00:00
a5b9645c4b
Split the Add, Sub, and Mul instruction opcodes into separate
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integer and floating-point opcodes, introducing
FAdd, FSub, and FMul.
For now, the AsmParser, BitcodeReader, and IRBuilder all preserve
backwards compatability, and the Core LLVM APIs preserve backwards
compatibility for IR producers. Most front-ends won't need to change
immediately.
This implements the first step of the plan outlined here:
http://nondot.org/sabre/LLVMNotes/IntegerOverflow.txt
llvm-svn: 72897
2009-06-04 22:49:04 +00:00
57e91eaf61
Reimplement the inner loop of DSE. It now uniformly uses getDependence(),
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doesn't do its own local caching, and is slightly more aggressive about
free/store dse (see testcase). This eliminates the last external client
of MemDep::getDependenceFrom().
llvm-svn: 60619
2008-12-06 00:53:22 +00:00
8c5ff516c6
Fix a thinko that manifested as a crash on clamav last night.
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llvm-svn: 60251
2008-11-29 20:29:04 +00:00
d3d9111ede
Fix PR3141 by ensuring that MemoryDependenceAnalysis::removeInstruction
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properly updates the reverse dependency map when it installs updated
dependencies for instructions that depend on the removed instruction.
llvm-svn: 60222
2008-11-28 22:51:08 +00:00
3f3389745d
Add support for eliminating stores that store the same value that was just loaded.
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This fixes PR2599.
llvm-svn: 54133
2008-07-28 16:14:26 +00:00
1e427c3264
sabre brings to my attention that the 'tr' suffix is also obsolete
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llvm-svn: 51349
2008-05-20 21:00:03 +00:00
f45ff35bfe
Rename the last test with .llx extension to .ll, resolve duplicate test by renaming to isnan2. Now that no test has llx ending there is no need to search for them from dg.exp too.
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llvm-svn: 51328
2008-05-20 19:52:04 +00:00
2cdcf2bd5f
Update old-style syntax in some "not grep" tests.
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llvm-svn: 50560
2008-05-01 23:50:07 +00:00
8cb19d967f
Fix DSE to not eliminate volatile loads with no uses.
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llvm-svn: 50370
2008-04-28 19:51:27 +00:00
b839c05a05
rename *.llx -> *.ll, last batch.
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llvm-svn: 49971
2008-04-19 22:32:52 +00:00
5640bd186a
Remove llvm-upgrade and update test cases.
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llvm-svn: 47793
2008-03-01 09:15:35 +00:00
4e4b116750
Make DSE much more aggressive by performing DCE earlier. Update a testcase to reflect this increased aggressiveness.
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llvm-svn: 46542
2008-01-30 01:24:47 +00:00
95bf1d4d7b
Add a testcase for eliminating memcpy's at the end of functions. Forgot to commit this with my last commit.
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llvm-svn: 46497
2008-01-29 06:40:32 +00:00
6af19fd1e2
DeadStoreElimination can treat byval parameters as if there were alloca's for the purpose of removing end-of-function stores.
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llvm-svn: 46351
2008-01-25 10:10:33 +00:00
2ed651ace7
Fix test/Transforms/DeadStoreElimination/PartialStore.ll, which had been
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silently failing because of an incorrect run line for some time.
llvm-svn: 43605
2007-11-01 05:29:16 +00:00
4d34e40c6d
Forgot to update these files for the FastDSE changes.
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llvm-svn: 40674
2007-08-01 16:53:51 +00:00
10e52eddb3
Rename FastDSE to just DSE.
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llvm-svn: 40668
2007-08-01 06:36:51 +00:00
59a6840d47
Move these tests to use FastDSE instead of old DSE.
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llvm-svn: 40444
2007-07-23 20:49:13 +00:00
2660cef6d7
Convert .cvsignore files
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llvm-svn: 37801
2007-06-29 16:35:07 +00:00
951d8dc29f
For PR1319:
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Upgrade to use new Tcl exec based test harness.
llvm-svn: 36062
2007-04-15 08:30:33 +00:00
d029c7e666
Make the llvm-runtest function much more amenable by eliminating all the
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global variables that needed to be passed in. This makes it possible to
add new global variables with only a couple changes (Makefile and llvm-dg.exp)
instead of touching every single dg.exp file.
llvm-svn: 35918
2007-04-11 19:56:59 +00:00
83b3d82672
Regression is gone, don't try to find it on clean target.
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llvm-svn: 33296
2007-01-17 07:59:14 +00:00
Nick Lewycky