79396539d3
remove dead code. The exit block list is computed on demand, thus does not
...
need to be updated. This code is a relic from when it did.
llvm-svn: 22775
2005-08-13 01:30:36 +00:00
62df798919
remove some trickiness that broke yacr2 and some other programs last night
...
llvm-svn: 22751
2005-08-10 17:15:20 +00:00
f83ce5faee
Make loop-simplify produce better loops by turning PHI nodes like X = phi [X, Y]
...
into just Y. This often occurs when it seperates loops that have collapsed loop
headers. This implements LoopSimplify/phi-node-simplify.ll
llvm-svn: 22746
2005-08-10 02:07:32 +00:00
257efb2ad3
This code can handle non-dominating instructions
...
llvm-svn: 22667
2005-08-05 00:57:45 +00:00
b392321cae
Fix a fixme in CondPropagate.cpp by moving a PhiNode optimization into
...
BasicBlock's removePredecessor routine. This requires shuffling around
the definition and implementation of hasContantValue from Utils.h,cpp into
Instructions.h,cpp
llvm-svn: 22664
2005-08-04 23:24:19 +00:00
b1c9317bb4
Remove trailing whitespace
...
llvm-svn: 21427
2005-04-21 23:48:37 +00:00
514e843e89
Enhance loopsimplify to preserve alias analysis instead of clobbering it.
...
This prevents crashes on some programs when using -ds-aa -licm.
llvm-svn: 20831
2005-03-25 06:37:22 +00:00
dd3ec92085
trivial simplification
...
llvm-svn: 20494
2005-03-06 21:35:38 +00:00
d8e20188c6
Adjust to changes in instruction interfaces.
...
llvm-svn: 19900
2005-01-29 00:39:08 +00:00
e29d634a94
hasConstantValue will soon return instructions that don't dominate the PHI node,
...
so prepare for this.
llvm-svn: 17095
2004-10-17 21:22:38 +00:00
3ce42ec7ee
Pull assignment out of for loop conditional in order for this to
...
compile under windows. Patch contributed by Paolo Invernizzi!
llvm-svn: 16534
2004-09-28 02:40:37 +00:00
3e86084641
Prototype these functions more accurately
...
llvm-svn: 16432
2004-09-20 04:43:15 +00:00
7c16caa336
Changes For Bug 352
...
Move include/Config and include/Support into include/llvm/Config,
include/llvm/ADT and include/llvm/Support. From here on out, all LLVM
public header files must be under include/llvm/.
llvm-svn: 16137
2004-09-01 22:55:40 +00:00
63b38bd2ed
Fix #includes of i*.h => Instructions.h as per PR403.
...
llvm-svn: 15334
2004-07-29 17:30:56 +00:00
f2c018c0c1
Fix PR404 try #2
...
This version takes about 1s longer than the previous one (down to 2.35s),
but on the positive side, it actually works :)
llvm-svn: 14856
2004-07-15 08:20:22 +00:00
daa12135da
Revert previous patch until I get a bug fixed
...
llvm-svn: 14853
2004-07-15 05:36:31 +00:00
70177e402d
Fix PR404: Loop simplify is really slow on 252.eon
...
This eliminates an N*N*logN algorithm from the loop simplify pass, replacing
it with a much simpler and faster alternative. In a debug build, this reduces
gccas time on eon from 85s to 42s.
llvm-svn: 14851
2004-07-15 04:27:04 +00:00
827826320d
Correct rewriting of exit blocks after my last patch
...
llvm-svn: 13048
2004-04-18 22:27:10 +00:00
d72c3eb54e
Change the ExitBlocks list from being explicitly contained in the Loop
...
structure to being dynamically computed on demand. This makes updating
loop information MUCH easier.
llvm-svn: 13045
2004-04-18 22:14:10 +00:00
89e959bb1f
Fix LoopSimplify/2004-04-13-LoopSimplifyUpdateDomFrontier.ll
...
LoopSimplify was not updating dominator frontiers correctly in some cases.
llvm-svn: 12890
2004-04-13 16:23:25 +00:00
a6e22814ab
Refactor code a bit to make it simpler and eliminate the goto
...
llvm-svn: 12888
2004-04-13 15:21:18 +00:00
8417052938
This patch addresses PR35: Loop simplify should reconstruct nested loops.
...
This is fairly straight-forward, but was a real nightmare to get just
perfect. aarg. :)
llvm-svn: 12884
2004-04-13 05:05:33 +00:00
59fdf74968
Remove some assertions that are now bogus with the last patch I put in
...
llvm-svn: 12595
2004-04-01 19:21:46 +00:00
146d0df5e4
Fix PR306: Loop simplify incorrectly updates dominator information
...
Testcase: LoopSimplify/2004-04-01-IncorrectDomUpdate.ll
llvm-svn: 12592
2004-04-01 19:06:07 +00:00
db5b8f4d6b
Fix a regression from this patch:
...
http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20040308/013095.html
Basically, this patch only updated the immediate dominatees of the header node
to tell them that the preheader also dominated them. In practice, ALL
dominatees of the header node are also dominated by the preheader.
This fixes: LoopSimplify/2004-03-15-IncorrectDomUpdate.
and PR293
llvm-svn: 12434
2004-03-16 06:00:15 +00:00
d078812f96
If a block is dead, dominators will not be calculated for it. Because of this
...
loop information won't see it, and we could have unreachable blocks pointing to
the non-header node of blocks in a natural loop. This isn't tidy, so have the
loopsimplify pass clean it up.
llvm-svn: 12380
2004-03-14 03:59:22 +00:00
797cb2f6c1
This little patch speeds up the loop used to update the dominator set analysis.
...
On the testcase from GCC PR12440, which has a LOT of loops (1392 of which require
preheaders to be inserted), this speeds up the loopsimplify pass from 1.931s to
0.1875s. The loop in question goes from 1.65s -> 0.0097s, which isn't bad. All of
these times are a debug build.
This adds a dependency on DominatorTree analysis that was not there before, but
we always had dominatortree available anyway, because LICM requires both loop
simplify and DT, so this doesn't add any extra analysis in practice.
llvm-svn: 12362
2004-03-13 22:01:26 +00:00
2dd1c8d8ce
Fix another dominator update bug. These bugs keep getting exposed because GCSE
...
keeps finding more code motion opportunities now that the dominators are correct!
llvm-svn: 11142
2004-02-05 23:20:59 +00:00
c0c953f0bc
Fix bug updating dominators
...
llvm-svn: 11140
2004-02-05 22:33:26 +00:00
14ab84a483
Fix PR223: Loopsimplify incorrectly updates dominator information
...
The problem is that the dominator update code didn't "realize" that it's
possible for the newly inserted basic block to dominate anything. Because
it IS possible, stuff was getting updated wrong.
llvm-svn: 11137
2004-02-05 21:12:24 +00:00
8d414ad035
Adjust to the new BasicBlock ctor, which requires a function parameter
...
llvm-svn: 11114
2004-02-04 03:58:28 +00:00
59d2d7fc33
Improve encapsulation in the Loop and LoopInfo classes by eliminating the
...
getSubLoops/getTopLevelLoops methods, replacing them with iterator-based
accessors.
llvm-svn: 10714
2004-01-08 00:09:44 +00:00
031a3f8cc7
Generalize a special case to fix PR187
...
llvm-svn: 10531
2003-12-19 06:27:08 +00:00
7710f2f49e
Finegrainify namespacification
...
Fix bug: LoopSimplify/2003-12-10-ExitBlocksProblem.ll
llvm-svn: 10373
2003-12-10 17:20:35 +00:00
6c237bcdf2
Do not insert one entry PHI nodes in split exit blocks!
...
llvm-svn: 10348
2003-12-09 23:12:55 +00:00
a29600046d
Minor cleanups and simplifications
...
llvm-svn: 10127
2003-11-21 16:52:05 +00:00
2af517281d
Start using the nicer terminator auto-insertion API
...
llvm-svn: 10111
2003-11-20 18:25:24 +00:00
960707c335
Put all LLVM code into the llvm namespace, as per bug 109.
...
llvm-svn: 9903
2003-11-11 22:41:34 +00:00
482202a601
Added LLVM project notice to the top of every C++ source file.
...
Header files will be on the way.
llvm-svn: 9298
2003-10-20 19:43:21 +00:00
c4622a6955
Add support to the loop canonicalization pass to make it transform loops to
...
have a SINGLE backedge. This is useful to, for example, the -indvars pass.
This implements testcase LoopSimplify/single-backedge.ll and closes PR#34
llvm-svn: 9065
2003-10-13 00:37:13 +00:00
72272a70b8
Rename loop preheaders pass to loop simplify
...
llvm-svn: 9061
2003-10-12 21:52:28 +00:00
55d4788397
File is renamed to LoopSimplify.cpp
...
llvm-svn: 9059
2003-10-12 21:44:18 +00:00
154e4d5dea
First step in renaming the preheaders pass to loopsimplify
...
llvm-svn: 9058
2003-10-12 21:43:28 +00:00
9703c02ce4
The preheader insertion pass only depends on the CFG. Mark it as such, which
...
allows GCCAS to only run it once.
llvm-svn: 9056
2003-10-12 19:33:10 +00:00
8b2bd4ed47
Fix spelling.
...
llvm-svn: 9027
2003-10-10 17:57:28 +00:00
bb9d03b9c0
Renamed DominatorTree::Node::getNode() -> getBlock()
...
llvm-svn: 8469
2003-09-11 16:26:13 +00:00
4ace48e0ca
Spell `occurrence' correctly.
...
llvm-svn: 8425
2003-09-09 21:54:45 +00:00
a34c477b05
Fix grammar, add comment
...
llvm-svn: 7967
2003-08-18 22:54:06 +00:00
7eb05a170a
Spell `necessary' correctly.
...
llvm-svn: 7944
2003-08-18 14:43:39 +00:00
0895025b30
Fix bug: LoopPreheaders/2003-05-12-PreheaderExitOfChild.ll
...
llvm-svn: 6153
2003-05-12 22:04:34 +00:00
Chris Lattner