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llvm-6502/include/llvm/Analysis
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Andrew Trick 10bb82e54f Rewrite SCEV's backedge taken count computation. 
Patch by Michele Scandale!

Rewrite of the functions used to compute the backedge taken count of a
loop on LT and GT comparisons.

I decided to split the handling of LT and GT cases becasue the trick
"a > b == -a < -b" in some cases prevents the trip count computation
due to the multiplication by -1 on the two operands of the
comparison. This issue comes from the conservative computation of
value range of SCEVs: taking the negative SCEV of an expression that
have a small positive range (e.g. [0,31]), we would have a SCEV with a
fullset as value range.

Indeed, in the new rewritten function I tried to better handle the
maximum backedge taken count computation when MAX/MIN expression are
used to handle the cases where no entry guard is found.

Some test have been modified in order to check the new value correctly
(I manually check them and reasoning on possible overflow the new
values seem correct).

I finally added a new test case related to the multiplication by -1
issue on GT comparisons.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194116 91177308-0d34-0410-b5e6-96231b3b80d8
2013-11-06 02:08:26 +00:00
..
AliasAnalysis.h Make BasicAliasAnalysis recognize the fact a noalias argument cannot alias another argument, even if the other argument is not itself marked noalias. 2013-05-28 08:17:48 +00:00
AliasSetTracker.h Remove unneeded #includes. 2013-03-18 23:33:44 +00:00
BlockFrequencyImpl.h Add some constantness. 2013-08-20 23:04:15 +00:00
BlockFrequencyInfo.h Fixed 80+ violation and added C++ to header. 2013-07-12 23:09:43 +00:00
BranchProbabilityInfo.h Add a new function attribute 'cold' to functions. 2013-05-24 12:26:52 +00:00
CallGraph.h Merge CallGraph and BasicCallGraph. 2013-10-31 03:03:55 +00:00
CallGraphSCCPass.h Fix include guards so they exactly match file names. 2013-01-10 00:45:19 +00:00
CallPrinter.h Added -view-callgraph module pass. 2013-01-11 17:28:14 +00:00
CaptureTracking.h Remove unneeded #includes. Use forward declarations instead. 2013-03-10 00:34:01 +00:00
CFG.h Add some constantness. 2013-08-20 23:04:15 +00:00
CFGPrinter.h Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
CodeMetrics.h Switch CodeMetrics itself over to use TTI to determine if an instruction 2013-01-21 13:04:33 +00:00
ConstantFolding.h Add missing -*- C++ -*- to headers 2013-05-17 21:43:39 +00:00
ConstantsScanner.h
DependenceAnalysis.h Use SmallVectorImpl& instead of SmallVector to avoid repeating small vector size. 2013-07-14 04:42:23 +00:00
DominanceFrontier.h Unweaken vtables as per http://llvm.org/docs/CodingStandards.html#ll_virtual_anch 2011-12-20 02:50:00 +00:00
DominatorInternals.h Sort the #include lines for the include/... tree with the script. 2012-12-03 17:02:12 +00:00
Dominators.h Add function DominatorTree::getDescendants(). 2013-09-19 17:18:35 +00:00
DomPrinter.h
DOTGraphTraitsPass.h Remove redundant 'llvm::' qualifications 2013-01-13 16:01:15 +00:00
FindUsedTypes.h land David Blaikie's patch to de-constify Type, with a few tweaks. 2011-07-18 04:54:35 +00:00
InlineCost.h Remove unneeded #include. 2013-06-06 23:34:11 +00:00
InstructionSimplify.h Fix missing -*- C++ -*-s 2013-08-06 00:16:21 +00:00
Interval.h Fix include guards so they exactly match file names. 2013-01-10 00:45:19 +00:00
IntervalIterator.h Fix a few typos in comments. 2013-03-05 22:05:16 +00:00
IntervalPartition.h Fix include guards so they exactly match file names. 2013-01-10 00:45:19 +00:00
IVUsers.h Remove duplicated forward declaration. 2013-03-06 00:04:32 +00:00
LazyValueInfo.h Move TargetData to DataLayout. 2012-10-08 16:38:25 +00:00
LibCallAliasAnalysis.h Fix include guards so they exactly match file names. 2013-01-10 00:45:19 +00:00
LibCallSemantics.h Revert 'Fix a typo 'iff' => 'if''. iff is an abreviation of if and only if. See: http://en.wikipedia.org/wiki/If_and_only_if Commit 164767 2012-09-27 10:14:43 +00:00
Lint.h Remove unused STL header includes. 2011-04-23 19:53:52 +00:00
Loads.h Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
LoopInfo.h Quick look-up for block in loop. 2013-10-26 03:08:02 +00:00
LoopInfoImpl.h Quick look-up for block in loop. 2013-10-26 03:08:02 +00:00
LoopIterator.h Remove unneeded #includes. 2013-02-09 13:29:10 +00:00
LoopPass.h LoopPass.h doesn't require Function.h. Remove unneeded #include. 2013-01-11 01:03:32 +00:00
MemoryBuiltins.h fix PR17635: false positive with packed structures 2013-10-24 09:17:24 +00:00
MemoryDependenceAnalysis.h Memory Dependence Analysis (not mem-dep test) take advantage of "invariant.load" metadata. 2013-03-06 17:48:48 +00:00
Passes.h Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
PHITransAddr.h Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
PostDominators.h Add a const version of findNearestCommonDominator to PostDom for convenience. 2013-06-09 15:09:30 +00:00
PtrUseVisitor.h Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
RegionInfo.h RegionInfo: Add helpers to replace entry/exit recursively 2013-04-10 06:54:49 +00:00
RegionIterator.h Fix include guards so they exactly match file names. 2013-01-10 00:45:19 +00:00
RegionPass.h Fix a typo (ouput => output) 2013-05-17 12:31:43 +00:00
RegionPrinter.h Add new RegionInfo pass. 2010-07-22 07:46:31 +00:00
ScalarEvolution.h Rewrite SCEV's backedge taken count computation. 2013-11-06 02:08:26 +00:00
ScalarEvolutionExpander.h Fix SCEVExpander: don't try to expand quadratic recurrences outside a loop. 2013-10-25 21:35:56 +00:00
ScalarEvolutionExpressions.h Pacify -Wnon-virtual-dtor 2013-02-15 23:51:59 +00:00
ScalarEvolutionNormalization.h Fix include guards so they exactly match file names. 2013-01-10 00:45:19 +00:00
SparsePropagation.h Fix include guards so they exactly match file names. 2013-01-10 00:45:19 +00:00
TargetTransformInfo.h Speling fixes. 2013-10-22 15:18:03 +00:00
Trace.h Fix include guards so they exactly match file names. 2013-01-10 00:45:19 +00:00
ValueTracking.h Teach MemoryBuiltins and InstructionSimplify that operator new never returns NULL. 2013-09-24 16:37:51 +00:00
Verifier.h