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History

Tobias Grosser 4ce43821ee Create Generic DOTGraphTraits Printer/Viewer Move the DOTGraphTraits dotty printer/viewer templates, that were developed for the dominance tree into their own header file. This will allow reuse in future passes. llvm-svn: 93632		2010-01-16 10:56:41 +00:00
..
IPA	Change dbgs() back to errs() for assert messages as Chris requested.	2009-12-23 23:14:41 +00:00
AliasAnalysis.cpp	Partially address a README by having functionattrs consider calls to	2010-01-06 08:45:52 +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
AliasSetTracker.cpp	Change dbgs() back to errs() as Chris requested.	2009-12-23 22:49:57 +00:00
Analysis.cpp	"In order to ease automatic bindings generation, it would be helpful if boolean values were distinguishable from integers. The attached patch introduces "typedef int LLVMBool;", and uses LLVMBool instead of int throughout the C API, wherever a boolean value is called for."	2010-01-09 22:27:07 +00:00
BasicAliasAnalysis.cpp
CaptureTracking.cpp	Reuse the Threshold value to size these containers because it's	2009-12-09 18:48:53 +00:00
CFGPrinter.cpp
CMakeLists.txt	add to cmake	2009-12-04 04:15:36 +00:00
ConstantFolding.cpp	fix PR5978 by peeling the loop so that we avoid shifting the	2010-01-08 19:02:23 +00:00
DbgInfoPrinter.cpp	Remove dead debug info intrinsics.	2010-01-05 01:10:40 +00:00
DebugInfo.cpp	Replace DebugLocTuple with DILocation.	2010-01-16 06:09:35 +00:00
DomPrinter.cpp	Create Generic DOTGraphTraits Printer/Viewer	2010-01-16 10:56:41 +00:00
InlineCost.cpp	Pad my commit stats by reducing indentation in this now separate	2010-01-14 23:00:10 +00:00
InstCount.cpp	Change dbgs() back to errs() as Chris requested.	2009-12-23 23:29:28 +00:00
InstructionSimplify.cpp
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	Use WriteAsOperand instead of getName() to print loop header names,	2010-01-09 18:17:45 +00:00
LazyValueInfo.cpp	Convert debug messages to use dbgs(). Generally this means	2009-12-23 20:43:58 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
LiveValues.cpp
LoopDependenceAnalysis.cpp	Convert debug messages to use dbgs(). Generally this means	2009-12-23 20:52:41 +00:00
LoopInfo.cpp	Restore dump() methods to Loop and MachineLoop.	2010-01-05 21:08:02 +00:00
LoopPass.cpp
Makefile
MemoryBuiltins.cpp
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
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
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
ScalarEvolution.cpp	Use WriteAsOperand instead of getName() to print loop header names,	2010-01-09 18:17:45 +00:00
ScalarEvolutionAliasAnalysis.cpp
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	teach ComputeNumSignBits to look through PHI nodes.	2010-01-07 23:44:37 +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.

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