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llvm-6502/lib/Analysis
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Chris Lattner 79fa3cf451 constant fold nasty constant expressions formed by llvm-gcc, 
wrapping up PR3351.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92410 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-02 01:22:23 +00:00
..
IPA Change dbgs() back to errs() for assert messages as Chris requested. 2009-12-23 23:14:41 +00:00
AliasAnalysis.cpp use the new isNoAlias method to simplify some code, only do an escaping check if 2009-11-23 16:46:41 +00:00
AliasAnalysisCounter.cpp Change dbgs() back to errs() as Chris requested. 2009-12-23 22:49:57 +00:00
AliasAnalysisEvaluator.cpp Change dbgs() back to errs() as Chris requested. 2009-12-23 22:49:57 +00:00
AliasDebugger.cpp Remove the AliasAnalysis::getMustAliases method, which is dead. 2009-11-22 16:01:44 +00:00
AliasSetTracker.cpp Change dbgs() back to errs() as Chris requested. 2009-12-23 22:49:57 +00:00
Analysis.cpp Tidy #includes. 2009-08-11 16:02:12 +00:00
BasicAliasAnalysis.cpp move DecomposeGEPExpression out into ValueTracking.cpp 2009-11-26 17:12:50 +00:00
CaptureTracking.cpp Reuse the Threshold value to size these containers because it's 2009-12-09 18:48:53 +00:00
CFGPrinter.cpp Remove includes of Support/Compiler.h that are no longer needed after the 2009-10-25 06:57:41 +00:00
CMakeLists.txt add to cmake 2009-12-04 04:15:36 +00:00
ConstantFolding.cpp constant fold nasty constant expressions formed by llvm-gcc, 2010-01-02 01:22:23 +00:00
DbgInfoPrinter.cpp fix Analysis/DebugInfo.h to not include Metadata.h. Do this 2009-12-31 03:02:08 +00:00
DebugInfo.cpp fix Analysis/DebugInfo.h to not include Metadata.h. Do this 2009-12-31 03:02:08 +00:00
DomPrinter.cpp Remove ShortNames from getNodeLabel in DOTGraphTraits 2009-11-30 12:38:47 +00:00
InlineCost.cpp Add a missing closing parenthesis, and tweak to fit in 80 2009-11-01 19:12:43 +00:00
InstCount.cpp Change dbgs() back to errs() as Chris requested. 2009-12-23 23:29:28 +00:00
InstructionSimplify.cpp factor some logic out of instcombine into a new SimplifyAddInst method. 2009-11-27 17:42:22 +00:00
Interval.cpp Change Pass::print to take a raw ostream instead of std::ostream, 2009-08-23 06:03:38 +00:00
IntervalPartition.cpp Change Pass::print to take a raw ostream instead of std::ostream, 2009-08-23 06:03:38 +00:00
IVUsers.cpp Convert debug messages to use dbgs(). Generally this means 2009-12-23 20:20:46 +00:00
LazyValueInfo.cpp Convert debug messages to use dbgs(). Generally this means 2009-12-23 20:43:58 +00:00
LibCallAliasAnalysis.cpp LibCallAliasAnalysis doesn't use TargetData. 2009-07-31 20:56:29 +00:00
LibCallSemantics.cpp Remove Value::getNameLen 2009-07-26 08:34:35 +00:00
LiveValues.cpp remove redundant foward declaration. This function is already in 2009-11-11 00:21:21 +00:00
LoopDependenceAnalysis.cpp Convert debug messages to use dbgs(). Generally this means 2009-12-23 20:52:41 +00:00
LoopInfo.cpp Add Loop contains utility methods for testing whether a loop 2009-12-18 01:24:09 +00:00
LoopPass.cpp Fix this debug output to handle the case where the loop has been deleted. 2009-09-28 15:40:01 +00:00
Makefile Removed trailing whitespace from Makefiles. 2009-01-09 16:44:42 +00:00
MemoryBuiltins.cpp Simplify ComputeMultiple so that it doesn't depend on TargetData. 2009-11-18 00:58:27 +00:00
MemoryDependenceAnalysis.cpp The phi translated pointer can be computed when returning a partially cached result 2009-12-22 04:25:02 +00:00
PHITransAddr.cpp Change dbgs() back to errs() as Chris requested. 2009-12-23 23:27:15 +00:00
PointerTracking.cpp remove a bunch of extraneous LLVMContext arguments 2009-11-06 04:27:31 +00:00
PostDominators.cpp Convert debug messages to use dbgs(). Generally this means 2009-12-23 21:16:54 +00:00
ProfileEstimatorPass.cpp Convert debug messages to use dbgs(). Generally this means 2009-12-23 21:27:29 +00:00
ProfileInfo.cpp Change dbgs() back to errs() for assert messages as Chris requested. 2009-12-23 22:59:29 +00:00
ProfileInfoLoader.cpp Reapplied r81355 with the problems fixed. 2009-09-16 11:35:50 +00:00
ProfileInfoLoaderPass.cpp Change dbgs() back to errs() for assert messages as Chris requested. 2009-12-23 23:00:50 +00:00
ProfileVerifierPass.cpp Convert debug messages to use dbgs(). Generally this means 2009-12-23 22:10:20 +00:00
README.txt Create a README.txt for lib/Analysis, and add an entry. 2009-09-28 18:38:53 +00:00
ScalarEvolution.cpp Remove dump routine and the associated Debug.h from a header. Patch up 2009-12-23 22:58:38 +00:00
ScalarEvolutionAliasAnalysis.cpp Make ScalarEvolutionAliasAnalysis slightly more aggressive, by making an 2009-10-31 14:32:25 +00:00
ScalarEvolutionExpander.cpp Fix a comment typo. 2009-12-04 01:33:04 +00:00
SparsePropagation.cpp Convert debug messages to use dbgs(). Generally this means 2009-12-23 22:28:01 +00:00
Trace.cpp Convert debug messages to use dbgs(). Generally this means 2009-12-23 22:35:10 +00:00
ValueTracking.cpp Fix GetConstantStringInfo to not look into MDString (it works on 2009-12-15 19:34:20 +00:00

README.txt 

Analysis Opportunities:

//===---------------------------------------------------------------------===//

In test/Transforms/LoopStrengthReduce/quadradic-exit-value.ll, the
ScalarEvolution expression for %r is this:

  {1,+,3,+,2}<loop>

Outside the loop, this could be evaluated simply as (%n * %n), however
ScalarEvolution currently evaluates it as

  (-2 + (2 * (trunc i65 (((zext i64 (-2 + %n) to i65) * (zext i64 (-1 + %n) to i65)) /u 2) to i64)) + (3 * %n))

In addition to being much more complicated, it involves i65 arithmetic,
which is very inefficient when expanded into code.

//===---------------------------------------------------------------------===//