llvm-6502/lib/Analysis
Dan Gohman c05d8aa6db Tolerate a null parent pointer.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116533 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-14 22:55:57 +00:00
..
IPA Analysis groups need to initialize their default implementations. 2010-10-13 21:49:58 +00:00
AliasAnalysis.cpp Analysis groups need to initialize their default implementations. 2010-10-13 21:49:58 +00:00
AliasAnalysisCounter.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
AliasAnalysisEvaluator.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
AliasDebugger.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
AliasSetTracker.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
Analysis.cpp
BasicAliasAnalysis.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
CaptureTracking.cpp
CFGPrinter.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
CMakeLists.txt
ConstantFolding.cpp add uadd_ov/usub_ov to apint, consolidate constant folding 2010-10-14 00:05:07 +00:00
DbgInfoPrinter.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
DebugInfo.cpp
DomPrinter.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
InlineCost.cpp Now using a variant of the existing inlining heuristics to decide whether to create a given specialization of a function in PartialSpecialization. If the total performance bonus across all callsites passing the same constant exceeds the specialization cost, we create the specialization. 2010-10-09 22:06:36 +00:00
InstCount.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
InstructionSimplify.cpp
Interval.cpp
IntervalPartition.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
IVUsers.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
LazyValueInfo.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
LibCallAliasAnalysis.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
LibCallSemantics.cpp
Lint.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
LiveValues.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
Loads.cpp
LoopDependenceAnalysis.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
LoopInfo.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
LoopPass.cpp
Makefile
MemDepPrinter.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
ModuleDebugInfoPrinter.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
PHITransAddr.cpp
PostDominators.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
ProfileEstimatorPass.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
ProfileInfo.cpp Analysis groups need to initialize their default implementations. 2010-10-13 21:49:58 +00:00
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
ProfileVerifierPass.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
README.txt
RegionInfo.cpp Add Region::isTopLevelRegion(). 2010-10-13 11:02:44 +00:00
RegionPrinter.cpp Now with fewer extraneous semicolons! 2010-10-07 22:25:06 +00:00
ScalarEvolution.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
ScalarEvolutionAliasAnalysis.cpp Begin adding static dependence information to passes, which will allow us to 2010-10-12 19:48:12 +00:00
ScalarEvolutionExpander.cpp
ScalarEvolutionNormalization.cpp
SparsePropagation.cpp
Trace.cpp
TypeBasedAliasAnalysis.cpp Tolerate a null parent pointer. 2010-10-14 22:55:57 +00:00
ValueTracking.cpp

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.

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

In formatValue in test/CodeGen/X86/lsr-delayed-fold.ll,

ScalarEvolution is forming this expression:

((trunc i64 (-1 * %arg5) to i32) + (trunc i64 %arg5 to i32) + (-1 * (trunc i64 undef to i32)))

This could be folded to

(-1 * (trunc i64 undef to i32))

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