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Author SHA1 Message Date
Jakob Stoklund Olesen
b92c9347ba Teach PHIElimination to split critical edges when -split-phi-edges is enabled. 
Critical edges leading to a PHI node are split when the PHI source variable is
live out from the predecessor block. This help the coalescer eliminate more
PHI joins.

llvm-svn: 86725
 2009-11-10 22:01:05 +00:00
Jakob Stoklund Olesen
35918309f2 Refactoring: Extract method PHIElimination::isLiveOut(). 
Clean up some whitespace.
No functional changes.

llvm-svn: 86724
 2009-11-10 22:00:56 +00:00
Chris Lattner
f48b199c43 improve comment. 
llvm-svn: 86723
 2009-11-10 21:45:09 +00:00
Chris Lattner
fca84b3dff Make jump threading eliminate blocks that just contain phi nodes, 
debug intrinsics, and an unconditional branch when possible.  This
reuses the TryToSimplifyUncondBranchFromEmptyBlock function split
out of simplifycfg.

llvm-svn: 86722
 2009-11-10 21:40:01 +00:00
Evan Cheng
f5e85bec73 Generalize lsr code that optimize loop to count down towards zero. 
llvm-svn: 86715
 2009-11-10 21:14:05 +00:00
Dan Gohman
d7b00c4c8d Optimize test more. 
llvm-svn: 86714
 2009-11-10 21:02:18 +00:00
Victor Hernandez
70963992b8 make this handle redefinition of malloc function with different prototype correctly 
llvm-svn: 86712
 2009-11-10 19:53:28 +00:00
Evan Cheng
58fbf886bb Change Thumb1 address mode printing, instead of 
[r0, #2 * 4]
Now
[r0, #8]

This makes Thumb2 assembly more uniform and frankly the scale doesn't add much.

llvm-svn: 86707
 2009-11-10 19:48:13 +00:00
Evan Cheng
2c0fc2e713 Add a comment. 
llvm-svn: 86706
 2009-11-10 19:44:56 +00:00
Duncan Sands
1053bb18c6 Add defensive break. 
llvm-svn: 86705
 2009-11-10 19:36:40 +00:00
Daniel Dunbar
d8e09f2f13 Add a monstrous hack to improve X86ISelDAGToDAG compile time. 
- Force NDEBUG on in any Release build. This drops the compile time to ~100s
   from ~600s, in Release mode.

 - This may just be a temporary workaround, I don't know the true nature of the
   gcc-4.2 compile time performance problem.

llvm-svn: 86695
 2009-11-10 18:24:37 +00:00
Duncan Sands
bfba3451b2 Fix obvious typo. 
llvm-svn: 86694
 2009-11-10 18:21:37 +00:00
Chris Lattner
dc0722e39a clarify logic. 
llvm-svn: 86689
 2009-11-10 17:00:47 +00:00
Douglas Gregor
852c7d16df CMake: Add Darwin-specific linker flags for building loadable modules 
llvm-svn: 86684
 2009-11-10 15:30:33 +00:00
Duncan Sands
732a2ed037 Teach DSE to eliminate useless trampolines. 
llvm-svn: 86683
 2009-11-10 13:49:50 +00:00
Duncan Sands
a25c87ef1f Add brackets to make gcc-4.4 happy. 
llvm-svn: 86681
 2009-11-10 09:32:10 +00:00
Duncan Sands
737962bca6 Codegen support for the llvm.invariant/lifetime.start/end intrinsics: 
just throw them away.

llvm-svn: 86678
 2009-11-10 09:08:09 +00:00
Victor Hernandez
3c98070f2c Update computeArraySize() to use ComputeMultiple() to determine the array size associated with a malloc; also extend PerformHeapAllocSRoA() to check if the optimized malloc's arg had its highest bit set, so that it is safe for ComputeMultiple() to look through sext instructions while determining the optimized malloc's array size 
llvm-svn: 86676
 2009-11-10 08:32:25 +00:00
Victor Hernandez
89c04dbe2f Add ComputeMultiple() analysis function that recursively determines if a Value V is a multiple of unsigned Base 
llvm-svn: 86675
 2009-11-10 08:28:35 +00:00
Chris Lattner
3455c2f5c6 optimize test 
llvm-svn: 86672
 2009-11-10 07:44:36 +00:00
Chris Lattner
562cc40dbb unify the code that determines whether it is a good idea to change the type 
of a computation.  This fixes some infinite loops when dealing with TD that
has no native types.

llvm-svn: 86670
 2009-11-10 07:23:37 +00:00
Nick Lewycky
4939d449e1 Simplify. 
llvm-svn: 86668
 2009-11-10 07:00:43 +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
9428f34d89 refactor TryToSimplifyUncondBranchFromEmptyBlock out of SimplifyCFG. 
llvm-svn: 86666
 2009-11-10 05:59:26 +00:00
Oscar Fuentes
ce417d0ac2 CMake: Support for building llvm loadable modules. 
llvm-svn: 86656
 2009-11-10 02:45:37 +00:00
Daniel Dunbar
9b762e5350 lit: Start documentation testing architecture. 
llvm-svn: 86655
 2009-11-10 02:41:27 +00:00
Daniel Dunbar
fbe1d52c6a lit: Add ExampleTests, for testing lit and demonstrating test suite features. 
llvm-svn: 86654
 2009-11-10 02:41:17 +00:00
Daniel Dunbar
da307a7868 lit: Fix bug in --show-suites which accidentally override the list of tests. 
llvm-svn: 86653
 2009-11-10 02:40:21 +00:00
Bruno Cardoso Lopes
b662991460 Fix PR5445 
llvm-svn: 86651
 2009-11-10 02:35:13 +00:00
Chris Lattner
04da9d4b33 I misread the parens, not so redundant after all. 
llvm-svn: 86648
 2009-11-10 02:04:54 +00:00
Chris Lattner
f3fc70a936 make jump threading recursively simplify expressions instead of doing it 
just one level deep.  On the testcase we go from getting this:

F1:                                               ; preds = %T2
  %F = and i1 true, %cond                         ; <i1> [#uses=1]
  br i1 %F, label %X, label %Y

to a fully threaded:

F1:                                               ; preds = %T2
  br label %Y


This changes gets us to the point where we're forming (too many) switch 
instructions on doug's strswitch testcase.

llvm-svn: 86646
 2009-11-10 01:57:31 +00:00
Chris Lattner
fb540241c8 remove some redundant parens. 
llvm-svn: 86645
 2009-11-10 01:56:04 +00:00
Oscar Fuentes
555721d2c2 CMake: Remove unnecessary `unset' which was not supported by old cmake 
releases.

llvm-svn: 86644
 2009-11-10 01:45:05 +00:00
Dan Gohman
ae83652ce1 Remove an unused variable. 
llvm-svn: 86642
 2009-11-10 01:37:57 +00:00
Dan Gohman
4d8fef974a Minor code simplification. 
llvm-svn: 86641
 2009-11-10 01:36:20 +00:00
Dan Gohman
b4edfdb842 Trim a bunch of unneeded code from this testcase. 
llvm-svn: 86640
 2009-11-10 01:33:08 +00:00
Chris Lattner
a087a1ca04 don't invalidate PN, rewrite of this code is in progress anyway. 
llvm-svn: 86639
 2009-11-10 01:19:06 +00:00
Chris Lattner
a279728372 add a new SimplifyInstruction API, which is like ConstantFoldInstruction, 
except that the result may not be a constant.  Switch jump threading to 
use it so that it gets things like (X & 0) -> 0, which occur when phi preds
are deleted and the remaining phi pred was a zero.

llvm-svn: 86637
 2009-11-10 01:08:51 +00:00
Jeffrey Yasskin
23ac706aab Fix DenseMap iterator constness. 
This patch forbids implicit conversion of DenseMap::const_iterator to
DenseMap::iterator which was possible because DenseMapIterator inherited
(publicly) from DenseMapConstIterator. Conversion the other way around is now
allowed as one may expect.

The template DenseMapConstIterator is removed and the template parameter
IsConst which specifies whether the iterator is constant is added to
DenseMapIterator.

Actually IsConst parameter is not necessary since the constness can be
determined from KeyT but this is not relevant to the fix and can be addressed
later.

Patch by Victor Zverovich!

llvm-svn: 86636
 2009-11-10 01:02:17 +00:00
Chris Lattner
3730cf6fef factor simplification logic for AND and OR out to InstSimplify from instcombine. 
llvm-svn: 86635
 2009-11-10 00:55:12 +00:00
David Goodwin
93a4f29c67 Fixed to address code review. No functional changes. 
llvm-svn: 86634
 2009-11-10 00:48:55 +00:00
Daniel Dunbar
886e51b5c1 Fix MemoryBuffer::getSTDIN to *not* return null if stdin is empty, this is a lame API. 
Also, Stringrefify some more MemoryBuffer functions, and add two performance FIXMEs.

llvm-svn: 86630
 2009-11-10 00:43:58 +00:00
David Goodwin
538f9c25f8 Allow targets to specify register classes whose member registers should not be renamed to break anti-dependencies. 
llvm-svn: 86628
 2009-11-10 00:15:47 +00:00
Chris Lattner
9941f27797 pull a bunch of logic out of instcombine into instsimplify for compare 
simplification, this handles the foldable fcmp x,x cases among many others.

llvm-svn: 86627
 2009-11-09 23:55:12 +00:00
Dan Gohman
22719d2a1a Pass the (optional) TargetData object to ConstantFoldInstOperands 
and ConstantFoldCompareInstOperands.

llvm-svn: 86626
 2009-11-09 23:34:17 +00:00
Chris Lattner
9aa69f2205 inline a simple function. 
llvm-svn: 86625
 2009-11-09 23:31:49 +00:00
Chris Lattner
25700676d4 rename SimplifyCompare -> SimplifyCmpInst and split it into 
Simplify[IF]Cmp pieces.  Add some predicates to CmpInst to 
determine whether a predicate is fp or int.

llvm-svn: 86624
 2009-11-09 23:28:39 +00:00
Jim Grosbach
ed9f847274 Now that the default is 'enabled,' a separate command line option for ARM is 
not necessary.

llvm-svn: 86621
 2009-11-09 23:11:45 +00:00
Mike Stump
ee3ba929d0 Add testcase for recent checkin. 
llvm-svn: 86620
 2009-11-09 23:10:49 +00:00
Chris Lattner
131172dc76 fix ConstantFoldCompareInstOperands to take the LHS/RHS as 
individual operands instead of taking a temporary array

llvm-svn: 86619
 2009-11-09 23:06:58 +00:00