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25935 Commits

Author SHA1 Message Date
Chris Lattner
adf33d42ed Eliminate the dropInstruction method, which is not needed any more. 
Fix a subtle iterator invalidation bug I introduced in the last commit.

llvm-svn: 60258
 2008-11-29 23:30:39 +00:00
Chris Lattner
6d2b59a58f implement some fixme's: when deleting an instruction with 
an entry in the nonlocal deps map, don't reset entries
referencing that instruction to [dirty, null], instead, set
them to [dirty,next] where next is the instruction after the
deleted one.  Use this information in the non-local deps
code to avoid rescanning entire blocks.

This speeds up GVN slightly by avoiding pointless work.  On
403.gcc this makes GVN 1.5% faster. 

llvm-svn: 60256
 2008-11-29 22:02:15 +00:00
Chris Lattner
3e86ec7289 Change MemDep::getNonLocalDependency to return its results as 
a smallvector instead of a DenseMap.  This speeds up GVN by 5%
on 403.gcc.

llvm-svn: 60255
 2008-11-29 21:33:22 +00:00
Chris Lattner
b19c015a87 move MemoryDependenceAnalysis::verifyRemoved to the end of the file, 
no functionality/code change.

llvm-svn: 60254
 2008-11-29 21:25:10 +00:00
Chris Lattner
ffc1af1619 reimplement getNonLocalDependency with a simpler worklist 
formulation that is faster and doesn't require nonLazyHelper.
Much less code.

llvm-svn: 60253
 2008-11-29 21:22:42 +00:00
Chris Lattner
f3e49f038c Fix a thinko that manifested as a crash on clamav last night. 
llvm-svn: 60251
 2008-11-29 20:29:04 +00:00
Chris Lattner
5feffd1b9b rename some maps. 
llvm-svn: 60242
 2008-11-29 09:20:15 +00:00
Chris Lattner
9427fbc5a2 rename some variables. 
llvm-svn: 60241
 2008-11-29 09:15:21 +00:00
Chris Lattner
a0265f808f eliminate a bunch of code in favor of using AliasAnalysis::getModRefInfo. 
Put a some code back to handle buggy behavior that GVN expects: it wants
loads to depend on each other, and accesses to depend on their allocations.

llvm-svn: 60240
 2008-11-29 09:09:48 +00:00
Chris Lattner
98eee41567 simplify some code and rename some variables. Reduce nesting. 
Use getTypeStoreSize instead of ABITypeSize for in-memory size
in a couple places.

llvm-svn: 60238
 2008-11-29 08:51:16 +00:00
Chris Lattner
96c72eef4b Split getDependency into getDependency and getDependencyFrom, the 
former does caching, the later doesn't.  This dramatically simplifies
the logic in getDependency and getDependencyFrom.

llvm-svn: 60234
 2008-11-29 03:47:00 +00:00
Bill Wendling
ed46ffe5c5 Temporarily revert r60195. It's causing an optimized bootstrap of llvm-gcc to fail. 
llvm-svn: 60233
 2008-11-29 03:43:04 +00:00
Chris Lattner
9e956ef129 Now that DepType is private, we can start cleaning up some of its uses: 
Document the Dirty value more precisely, use it for the uninitialized
DepResultTy value.  Change reverse mappings to be from an instruction*
instead of DepResultTy, and stop tracking other forms.  This makes it more
clear that we only care about the instruction cases.

Eliminate a DepResultTy,bool pair by using Dirty in the local case as well,
shrinking the map and simplifying the code.

This speeds up GVN by ~3% on 403.gcc.

llvm-svn: 60232
 2008-11-29 03:22:12 +00:00
Chris Lattner
6bf62f050c Introduce and use a new MemDepResult class to hold the results of a memdep 
query.  This makes it crystal clear what cases can escape from MemDep that
the clients have to handle.  This also gives the clients a nice simplified
interface to it that is easy to poke at.

This patch also makes DepResultTy and MemoryDependenceAnalysis::DepType
private, yay.

llvm-svn: 60231
 2008-11-29 02:29:27 +00:00
Chris Lattner
e9295510b5 Reimplement the internal abstraction used by MemDep in terms 
of a pointer/int pair instead of a manually bitmangled pointer.
This forces clients to think a little more about checking the 
appropriate pieces and will be useful for internal 
implementation improvements later.

I'm not particularly happy with this.  After going through this
I don't think that the clients of memdep should be exposed to
the internal type at all.  I'll fix this in a subsequent commit.

This has no functionality change.

llvm-svn: 60230
 2008-11-29 01:43:36 +00:00
Chris Lattner
494758e720 Fix PR3141 by ensuring that MemoryDependenceAnalysis::removeInstruction 
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
Chris Lattner
aedb1385c2 don't revisit instructions off the beginning of the block. 
llvm-svn: 60221
 2008-11-28 22:50:08 +00:00
Chris Lattner
219e9af693 more cleanups for MemoryDependenceAnalysis::removeInstruction, 
no functionality change.

llvm-svn: 60219
 2008-11-28 22:28:27 +00:00
Chris Lattner
7b984beb45 random cleanups, no functionality change. 
llvm-svn: 60218
 2008-11-28 22:04:47 +00:00
Chris Lattner
ef04ddf87c Run verifyRemoved from removeInstruction when -debug is specified. 
This shows the root problem behind PR3141.

llvm-svn: 60216
 2008-11-28 21:45:17 +00:00
Chris Lattner
cc3a3c0c98 rename "ping" to "verifyRemoved". I don't know why 'ping' what chosen, 
but it doesn't make any sense at all.

Also make the method const, private, and fit in 80 cols while we're at it.

llvm-svn: 60215
 2008-11-28 21:42:09 +00:00
Chris Lattner
d7ea2954a7 simplify some code, remove escaped newline. 
llvm-svn: 60213
 2008-11-28 21:29:52 +00:00
Chris Lattner
ad6c575105 remove mysterious escaped newlines. 
llvm-svn: 60211
 2008-11-28 21:16:44 +00:00
Chris Lattner
a854ab3760 don't call MergeBasicBlockIntoOnlyPred on a block whose only 
predecessor is itself.  This doesn't make sense, and this is
a dead infinite loop anyway.

llvm-svn: 60210
 2008-11-28 19:54:49 +00:00
Duncan Sands
850748f5de Add include files needed when building with 
gcc 4.4 (due to use of sprintf).

llvm-svn: 60209
 2008-11-28 10:20:03 +00:00
Duncan Sands
7fd4ea5847 Fix build with gcc-4.4: it doesn't like PICStyle 
being both a namespace and a variable name.

llvm-svn: 60208
 2008-11-28 09:29:37 +00:00
Chris Lattner
1b70ed5140 rewrite RecursivelyDeleteTriviallyDeadInstructions to use a more efficient 
formulation that doesn't require set lookups or scanning a set.

llvm-svn: 60203
 2008-11-28 01:20:46 +00:00
Chris Lattner
b9af105cff remove some weirdness that came from the LSR code that has 
nothing to do with dead instruction elimination.  No tests in
dejagnu depend on this, so I don't know what it was needed for.

llvm-svn: 60202
 2008-11-28 00:58:15 +00:00
Chris Lattner
69e0a27f94 rewrite a big chunk of how DSE does recursive dead operand 
elimination to use more modern infrastructure.  Also do a bunch
of small cleanups.

llvm-svn: 60201
 2008-11-28 00:27:14 +00:00
Chris Lattner
4486266c9d delete ErasePossiblyDeadInstructionTree, replacing uses of it with 
RecursivelyDeleteTriviallyDeadInstructions.

llvm-svn: 60196
 2008-11-27 23:25:44 +00:00
Chris Lattner
8231357a92 Simplify LoopStrengthReduce::DeleteTriviallyDeadInstructions by 
making it use RecursivelyDeleteTriviallyDeadInstructions to do
the heavy lifting.

llvm-svn: 60195
 2008-11-27 23:23:35 +00:00
Chris Lattner
53ebef9cbb enhance RecursivelyDeleteTriviallyDeadInstructions to make 
PHIs dead if they are single-value.

llvm-svn: 60194
 2008-11-27 23:18:11 +00:00
Chris Lattner
8b382de4e0 Enhance RecursivelyDeleteTriviallyDeadInstructions to optionally 
return a list of deleted instructions.

llvm-svn: 60193
 2008-11-27 23:14:34 +00:00
Chris Lattner
b2bd29b39b use continue to reduce indentation 
llvm-svn: 60192
 2008-11-27 23:00:20 +00:00
Chris Lattner
b374a0158a remove doConstantPropagation and dceInstruction, they are just 
wrappers around the interesting code and use an obscure iterator
abstraction that dates back many many years.

Move EraseDeadInstructions to Transforms/Utils and name it
RecursivelyDeleteTriviallyDeadInstructions.

llvm-svn: 60191
 2008-11-27 22:57:53 +00:00
Chris Lattner
740eb92968 simplify code. 
llvm-svn: 60190
 2008-11-27 22:56:14 +00:00
Chris Lattner
d3f7621acd simplify this logic. 
llvm-svn: 60189
 2008-11-27 22:46:09 +00:00
Nick Lewycky
f5d5d6026f Also update the README. 
llvm-svn: 60188
 2008-11-27 22:41:45 +00:00
Nick Lewycky
40db216722 Chris prefers icmp/select over udiv! 
llvm-svn: 60187
 2008-11-27 22:41:10 +00:00
Nick Lewycky
0064d6236e Add a synthetic missed optimization. 
llvm-svn: 60186
 2008-11-27 22:12:22 +00:00
Nick Lewycky
882443585d Add a couple of missed optimizations on integer vectors. Multiply and divide 
by 1, as well as multiply by -1.

llvm-svn: 60182
 2008-11-27 20:21:08 +00:00
Chris Lattner
8c052366b3 defensive patch: if CGP is merging a block with the entry block, make sure 
it ends up being the entry block.

llvm-svn: 60180
 2008-11-27 19:29:14 +00:00
Chris Lattner
73b251b3bf Fix PR3138: if we merge the entry block into another block, make sure to 
move the other block back up into the entry position!

llvm-svn: 60179
 2008-11-27 19:25:19 +00:00
Nick Lewycky
847a671436 Silence a warning. 
Despite changing the order of evaluation, this doesn't actually change the
meaning of the statement.

llvm-svn: 60177
 2008-11-27 17:29:52 +00:00
Nuno Lopes
1e97b6c181 fix build on some machines. thanks buildbot 
llvm-svn: 60175
 2008-11-27 16:42:44 +00:00
Nuno Lopes
e3f6758e3c fix my previous commit r60064: compare strings instead of pointers 
llvm-svn: 60174
 2008-11-27 16:37:02 +00:00
Chris Lattner
2959f6224e switch InstCombine::visitLoadInst to use 
FindAvailableLoadedValue

llvm-svn: 60169
 2008-11-27 08:56:30 +00:00
Chris Lattner
dd755c74d6 improve const correctness. 
llvm-svn: 60168
 2008-11-27 08:39:18 +00:00
Chris Lattner
0bd942ecb5 enhance FindAvailableLoadedValue to make use of AliasAnalysis 
if it has it.

llvm-svn: 60167
 2008-11-27 08:18:12 +00:00
Chris Lattner
577096bcaa move FindAvailableLoadedValue from JumpThreading to Transforms/Utils. 
llvm-svn: 60166
 2008-11-27 08:10:05 +00:00