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76 Commits

Author SHA1 Message Date
Nick Lewycky
7ea3dd8ae5 Do simple cross-block DSE when we encounter a free statement. Fixes PR11240. 
llvm-svn: 143808
 2011-11-05 10:48:42 +00:00
Daniel Dunbar
0193e03f99 Speculatively revert "DeadStoreElimination can now trim the size of a store if 
the end of it is dead.", which appears to break bootstrapping LLVM.

llvm-svn: 143668
 2011-11-04 00:48:26 +00:00
Pete Cooper
4902705b5f DeadStoreElimination can now trim the size of a store if the end of it is dead. 
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
Nick Lewycky
4d47e224d7 A dead malloc, a free(NULL) and a free(undef) are all trivially dead 
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
Nick Lewycky
25e5f6896b A non-escaping malloc in the entry block is not unlike an alloca. Do dead-store 
elimination on them too.

llvm-svn: 142735
 2011-10-22 21:59:35 +00:00
Owen Anderson
ca0326a423 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. 
llvm-svn: 139150
 2011-09-06 18:14:09 +00:00
Owen Anderson
58a5ca1320 Remove empty file. 
llvm-svn: 138830
 2011-08-30 21:17:20 +00:00
Owen Anderson
d3a9f00a58 Speculatively revert r138809 in an attempt to fix DragonEgg. 
llvm-svn: 138829
 2011-08-30 21:11:06 +00:00
Owen Anderson
3ec8beb8c8 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. 
llvm-svn: 138809
 2011-08-30 18:51:55 +00:00
Eli Friedman
775a316a06 Atomic load/store handling for the passes using memdep (GVN, DSE, memcpyopt). 
llvm-svn: 137888
 2011-08-17 22:22:24 +00:00
Eli Friedman
baf0f69f9a Move "atomic" and "volatile" designations on instructions after the opcode 
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
Chris Lattner
ad5400fa72 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
9ec82f54d4 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
Chris Lattner
c64a4d1170 fix a really nasty basicaa mod/ref calculation bug that was causing miscompilation of 
UnitTests/ObjC/messages-2.m with the recent optimizer improvements.

llvm-svn: 131897
 2011-05-23 05:15:43 +00:00
Bill Wendling
59a1021dc6 * The DSE code that tested for overlapping needed to take into account the fact 
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
Bill Wendling
72b390743d PR9561: A store with a negative offset (via GEP) could erroniously say that it 
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
Chris Lattner
db6c348f31 Fix PR8728, a miscompilation I recently introduced. When optimizing 
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
Chris Lattner
c888f3ec58 Enhance DSE to handle the variable index case in PR8657. 
llvm-svn: 120498
 2010-11-30 23:43:23 +00:00
Chris Lattner
b9c5a6fa04 teach DSE to use GetPointerBaseWithConstantOffset to analyze 
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
Chris Lattner
41b6b286a3 enhance isRemovable to refuse to delete volatile mem transfers 
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
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
56b0cc6974 merge one more away 
llvm-svn: 120375
 2010-11-30 01:06:43 +00:00
Chris Lattner
8e2909e4d8 I already merged partial-overwrite.ll -> PartialStore.ll 
Merge context-sensitive.ll -> simple.ll and upgrade it.

llvm-svn: 120374
 2010-11-30 01:05:07 +00:00
Chris Lattner
496eacefab clean up DSE tests, removing some poorly reduced and useless old test, 
merging more into other larger .ll files, filecheckizing along the way.

llvm-svn: 120373
 2010-11-30 01:00:34 +00:00
Chris Lattner
083731f3d6 enhance basicaa to return "Mod" for a memcpy call when the 
queried location doesn't overlap the source, and add a testcase.

llvm-svn: 120370
 2010-11-30 00:43:16 +00:00
Chris Lattner
8ec1830a01 Teach basicaa that memset's modref set is at worst "mod" and never 
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
Chris Lattner
975dcf5ac8 my previous patch would cause us to start deleting some volatile 
stores, fix and add a testcase.

llvm-svn: 120363
 2010-11-30 00:12:39 +00:00
Benjamin Kramer
84bf47f2d8 Fix some broken CHECK lines. 
llvm-svn: 120332
 2010-11-29 22:34:55 +00:00
Chris Lattner
2f8a9e1eac fix PR8677, patch by Jakub Staszak! 
llvm-svn: 120325
 2010-11-29 21:59:31 +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
Chris Lattner
32a16bce7a file checkize 
llvm-svn: 119926
 2010-11-21 07:32:40 +00:00
Dan Gohman
bc5a716f10 Enhance DSE to handle the case where a free call makes more than 
one store dead. This is especially noticeable in
SingleSource/Benchmarks/Shootout/objinst.

llvm-svn: 118875
 2010-11-12 02:19:17 +00:00
Dan Gohman
2cf0e523cb Filecheckize. 
llvm-svn: 118874
 2010-11-12 02:02:39 +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
Chris Lattner
23334439e9 add newlines at the end of files. 
llvm-svn: 100705
 2010-04-07 22:53:17 +00:00
Chris Lattner
a087e6e82f Make DSE only scan blocks that are reachable from the entry 
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
Dan Gohman
5fa04f2707 Delete useless trailing semicolons. 
llvm-svn: 92740
 2010-01-05 17:55:26 +00:00
Benjamin Kramer
6cd9b2ba74 Fix some CHECK lines which were ignored by accident. 
llvm-svn: 91214
 2009-12-12 09:25:50 +00:00
Owen Anderson
f47cde694f Cleanup/remove some parts of the lifetime region handling code in memdep and GVN, 
per Chris' comments.  Adjust testcases to match.

llvm-svn: 90304
 2009-12-02 07:35:19 +00:00
Nick Lewycky
ff44d9d88a Teach memdep to look for memory use intrinsics during dependency queries. Fixes 
PR5574.

llvm-svn: 90045
 2009-11-28 21:27:49 +00:00
Chris Lattner
f825d5d176 implement a FIXME: limit the depth that DecomposeGEPExpression goes the same 
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
Nick Lewycky
fba1efd298 Teach BasicAA that a constant expression can't alias memory provably not 
allocated until runtime (such as an alloca). Patch by Hans Wennborg!

llvm-svn: 88760
 2009-11-14 06:15:14 +00:00
Duncan Sands
732a2ed037 Teach DSE to eliminate useless trampolines. 
llvm-svn: 86683
 2009-11-10 13:49:50 +00:00
Nick Lewycky
f6be02e523 Reapply r86359, "Teach dead store elimination that certain intrinsics write to 
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
Chris Lattner
c9fb52966e remove empty files. 
llvm-svn: 86392
 2009-11-07 18:03:32 +00:00
Chris Lattner
15b00179d0 Revert r86359, it is breaking the self host on the 
llvm-gcc-i386-darwin9 build bot.

llvm-svn: 86391
 2009-11-07 17:59:32 +00:00
Nick Lewycky
80180a0497 Teach dead store elimination that certain intrinsics write to memory just like 
a store.

llvm-svn: 86359
 2009-11-07 08:34:40 +00:00
Chris Lattner
a003aee613 improve DSE when TargetData is not around, based on work by 
Hans Wennborg!

llvm-svn: 86067
 2009-11-04 23:20:12 +00:00
Kenneth Uildriks
e711736014 Make opt default to not adding a target data string and update tests that depend on target data to supply it within the test 
llvm-svn: 85900
 2009-11-03 15:29:06 +00:00
Owen Anderson
cfb2c9edeb Treat lifetime begin/end markers as allocations/frees respectively for the 
purposes for GVN/DSE.

llvm-svn: 85383
 2009-10-28 07:05:35 +00:00