llvm-mirror

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History

Devang Patel 1527b2657b Avoid using DIDescriptor.isNull(). This is a first step towards eliminating unncessary constructor checks in light weight DIDescriptor wrappers. llvm-svn: 97947		2010-03-08 18:25:48 +00:00
..
IPA	Update CMake build.	2010-03-01 19:42:47 +00:00
AliasAnalysis.cpp
AliasAnalysisCounter.cpp	Fix a missing newline in debug output.	2010-03-01 17:42:55 +00:00
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp
BasicAliasAnalysis.cpp
CaptureTracking.cpp
CFGPrinter.cpp
CMakeLists.txt
ConstantFolding.cpp
DbgInfoPrinter.cpp
DebugInfo.cpp	Avoid using DIDescriptor.isNull().	2010-03-08 18:25:48 +00:00
DomPrinter.cpp
InlineCost.cpp
InstCount.cpp
InstructionSimplify.cpp	fix incorrect folding of icmp with undef, PR6481.	2010-03-03 19:46:03 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	Spelling fixes.	2010-03-01 17:49:51 +00:00
LazyValueInfo.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
LiveValues.cpp
LoopDependenceAnalysis.cpp
LoopInfo.cpp
LoopPass.cpp
Makefile
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp	Reapply r97010, the speculative revert failed.	2010-02-24 08:48:04 +00:00
PHITransAddr.cpp	Reapply r97010, the speculative revert failed.	2010-02-24 08:48:04 +00:00
PointerTracking.cpp
PostDominators.cpp
ProfileEstimatorPass.cpp
ProfileInfo.cpp
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp
ProfileVerifierPass.cpp
README.txt
ScalarEvolution.cpp	Spelling fixes.	2010-03-01 17:49:51 +00:00
ScalarEvolutionAliasAnalysis.cpp	Add a comment.	2010-03-01 17:56:04 +00:00
ScalarEvolutionExpander.cpp	Fix another case where LSR was affected by debug info.	2010-03-06 02:45:26 +00:00
SparsePropagation.cpp
Trace.cpp
ValueTracking.cpp	Move GetStringLength and helper from SimplifyLibCalls to ValueTracking.	2010-03-05 06:58:57 +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.

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