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2526 Commits

Author SHA1 Message Date
Nick Lewycky
b4d1bc989e Reduce x - y to -y when we know the 'x' part will get masked off anyways. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53271 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-09 04:32:37 +00:00
Devang Patel
a5e27f8028 If loop induction variable's start value is less then its exit value then do not split the loop. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53265 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-09 00:12:01 +00:00
Chris Lattner
710429645a Fix PR2496, a really nasty bug which involved sinking volatile loads 
into phis.  This is actually the same bug as PR2262 /
2008-04-29-VolatileLoadDontMerge.ll, but I missed checking the first 
predecessor for multiple successors.  Testcase here:
InstCombine/2008-07-08-VolatileLoadMerge.ll



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53240 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-08 17:18:32 +00:00
Evan Cheng
1ce75dcbbc Fix two serious LSR bugs. 
1. LSR runOnLoop is always returning false regardless if any transformation is made.
2. AddUsersIfInteresting can create new instructions that are added to DeadInsts. But there is a later early exit which prevents them from being freed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53193 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-07 19:51:32 +00:00
Dan Gohman
6b345ee9b2 Make DenseMap's insert return a pair, to more closely resemble std::map. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53177 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-07 17:46:23 +00:00
Nick Lewycky
b8cd6a49b5 Fix missed optimization opportunity when analyzing cast of mul and select. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53151 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-05 21:19:34 +00:00
Owen Anderson
0ae33ef202 Use information already present in the ValueTable to fast-fail when we know there won't be a value number match. This speeds up GVN on a case where there are very few redundancies by ~25%. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53108 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 17:44:33 +00:00
Devang Patel
77a01136ff Do not try to update dominator info while manipulating CFG. This code does not handle all cases and keeps invalid dom info around some cases, which misleads other passes down stream. 
Right now, dom info is recaluclated in the end if the loop is switched.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53106 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 17:37:52 +00:00
Owen Anderson
9da02b844f Remove the ability for ADCE to remove unreachable blocks in loop nests, because, as Eli pointed out, SimplifyCFG already does this. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53104 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 17:21:41 +00:00
Bill Wendling
38976dc394 Remove unused function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53090 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 07:10:03 +00:00
Devang Patel
98260a474c Preserve dom info. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53089 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 07:04:22 +00:00
Devang Patel
f31b3bbd10 Remove extra FIXME 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53087 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 06:50:04 +00:00
Devang Patel
4be7d294f8 Reconstruct dom info, if loop is unswitched. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53086 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 06:48:21 +00:00
Devang Patel
b76247b8b1 LoopUnswitch does not preserve dominator info in all cases. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53085 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 05:55:03 +00:00
Devang Patel
825cb98d9a Undo previous patch. It is not that simple to fix dom info here. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53062 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-03 00:08:13 +00:00
Devang Patel
501e763dfe Preserve dom info while simplifing loop after the unswitch. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53052 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 22:58:54 +00:00
Owen Anderson
ea6462bfd0 Use df_ext_iterator to capture the reachable set without allocating an extra set. 
Also, move large sets and vectors out of instance variables and onto the stack,
and give them more reasonable sizes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53044 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 18:41:09 +00:00
Owen Anderson
cb29a4f66a Avoid a redundant call. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53040 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 18:15:31 +00:00
Owen Anderson
77d76b7ef7 Add support to ADCE for pruning unreachable blocks. This addresses the final 
part of PR2509.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53038 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 18:05:19 +00:00
Owen Anderson
2c04b0da2b Use DenseSet rather than SmallPtrSet for the alive set. Using SmallPtrSet 
with a huge "size" parameter is actually quite inefficient.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53034 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 17:32:04 +00:00
Owen Anderson
f2aa160b35 A better fix for PR2503 that doesn't pessimize GVN in the presence of unreachable blocks. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53032 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 17:20:16 +00:00
Devang Patel
1e41f6d724 reuse vectors. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53007 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 01:44:29 +00:00
Devang Patel
2095c38c7a Fix comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53006 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 01:31:19 +00:00
Devang Patel
e6962dfb64 Preserve loop data so that it is not fetched everytime it is needed. 
Keep track of currentLoop.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53005 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-07-02 01:18:13 +00:00
Evan Cheng
0ff39b3feb - Re-apply 52748 and friends with fix. GetConstantStringInfo() returns an empty string for ConstantAggregateZero case which surprises selectiondag. 
- Correctly handle memcpy from constant string which is zero-initialized.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52891 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-30 07:31:25 +00:00
Anton Korobeynikov
6d116bc7ce Revert (52748 and friends): 
Move GetConstantStringInfo to lib/Analysis. Remove
string output routine from Constant. Update all
callers. Change debug intrinsic api slightly to
accomodate move of routine, these now return values
instead of strings.

This unbreaks llvm-gcc bootstrap.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52884 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-29 17:57:03 +00:00
Eric Christopher
872a738775 Remove unused function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52749 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-26 01:19:35 +00:00
Eric Christopher
0d2b0aba42 Move GetConstantStringInfo to lib/Analysis. Remove 
string output routine from Constant. Update all
callers. Change debug intrinsic api slightly to
accomodate move of routine, these now return values
instead of strings.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52748 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-26 00:31:12 +00:00
Chris Lattner
aa0bf52625 Fix PR2488, a case where we deleted stack restores too aggressively. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52702 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-25 05:59:28 +00:00
Dan Gohman
2864ce6065 Fix a typo in a comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52687 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-24 18:00:21 +00:00
Dan Gohman
cb41e6bf52 Use use_empty() instead of getNumUses(), avoiding a use list traversal. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52651 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 23:23:49 +00:00
Dan Gohman
73b43b9b54 Fix spelling and grammar in a comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52648 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 22:11:52 +00:00
Evan Cheng
2e9f0b1a32 Disable PRE. It's breaking bootstrapping. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52643 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 21:22:35 +00:00
Owen Anderson
b70a571c99 Tighten the conditions under which we do PRE, remove some unneeded code, and correct our preserved analyses list, since we 
do now change the CFG by splitting critical edges during PRE.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52631 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 17:49:45 +00:00
Chris Lattner
2a6a645709 minor tidying of comments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52630 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 17:11:23 +00:00
Owen Anderson
ae18bd4246 At Chris' suggestion, move the liveness and worklist datastructures into 
instance variables so they can be allocated just once, and reuse the worklist
as the dead list as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52618 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-23 06:13:12 +00:00
Dan Gohman
cbfe5bbe88 Improve LSR's dead-phi detection to handle use-def cycles 
with more than two nodes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52617 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-22 20:44:02 +00:00
Dan Gohman
9b78763fce Use Loop::block_iterator. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52616 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-22 20:18:58 +00:00
Chris Lattner
963a97f1a3 Fix PR2369 by making scalarrepl more careful about promoting 
structures.  Its default threshold is to promote things that are
smaller than 128 bytes, which is sane.  However, it is not sane
to do this for things that turn into 128 *registers*.  Add a cap
on the number of registers introduced, defaulting to 128/4=32.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52611 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-22 17:46:21 +00:00
Eli Friedman
5c1f172213 Fix for PR2479: correctly optimize expressions like (a > 13) & (a == 
15).

See also PR1800, which is about the signed case.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52608 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-21 23:36:13 +00:00
Dan Gohman
1adec83ae8 Use Instruction::eraseFromParent(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52606 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-21 22:08:46 +00:00
Evan Cheng
4ce138cc55 Enable PRE. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52574 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-21 07:26:53 +00:00
Dan Gohman
60ea268645 Tidy up some commments and use the getAggregateOperand and 
getInsertedValueOperand accessors. Thanks Matthijs!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52543 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 16:41:17 +00:00
Dan Gohman
dfaceb49fc Fix the conditions under which SCCP should examine insertvalue 
instructions. Thanks to Matthijs Kooijman for pointing this out!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52542 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 16:39:44 +00:00
Owen Anderson
f2204d7bb1 Really disable PRE. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52531 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 08:59:13 +00:00
Chris Lattner
2de3fec61c Fix PR2471, which is a bug involving an invalid promotion from a conditional load. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52525 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 05:12:56 +00:00
Owen Anderson
6fafe847b2 Change around the data structures used to store availability sets, resulting in a GVN+PRE that is faster that GVN alone was before. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52521 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 01:15:47 +00:00
Dan Gohman
c4b65ea56b Teach SCCP about insertvalue and extractvalue, and about 
propagating constants across aggregate return values when
insertvalue and extractvalue are used.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52520 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 01:15:44 +00:00
Evan Cheng
88d11c03cd Disable PRE for now. It seems to be breaking llvm-gcc bootstrapping. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52518 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-20 01:01:07 +00:00
Owen Anderson
aa0b63422a Add a hidden -disable-pre flag for testing purposes. This should be removed 
once benchmarking is completed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52506 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-06-19 19:57:25 +00:00