llvm/Analysis at 5ee60f75087021ab02fa72535593d598c3afe5e2 - llvm

RPCSX/llvm

mirror of https://github.com/RPCSX/llvm.git synced 2024-12-15 16:09:02 +00:00

History

Dan Gohman 5ee60f7508 Fix indentation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101001 91177308-0d34-0410-b5e6-96231b3b80d8		2010-04-11 23:44:58 +00:00
..
IPA	Ok, third time's the charm. No changes from last time except the CMake	2010-04-02 23:17:14 +00:00
AliasAnalysis.cpp
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp	clean up algorithm and remove operand order assumptions	2010-04-08 16:46:24 +00:00
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp
BasicAliasAnalysis.cpp	Pointers to zero-sized objects don't point to overlapping objects.	2010-04-08 18:11:50 +00:00
CaptureTracking.cpp
CFGPrinter.cpp
CMakeLists.txt	Update CMake build.	2010-04-08 18:52:18 +00:00
ConstantFolding.cpp
DbgInfoPrinter.cpp
DebugInfo.cpp	DebugInfoFinder::processModule was foiling my plot by	2010-04-02 20:44:29 +00:00
DomPrinter.cpp
InlineCost.cpp
InstCount.cpp
InstructionSimplify.cpp
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	Add a cast to void to show that the return value is being	2010-04-11 19:30:19 +00:00
LazyValueInfo.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp	Add several more lint checks.	2010-04-09 01:39:53 +00:00
LiveValues.cpp
LoopDependenceAnalysis.cpp
LoopInfo.cpp
LoopPass.cpp	Ok, third time's the charm. No changes from last time except the CMake	2010-04-02 23:17:14 +00:00
Makefile
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp
PHITransAddr.cpp
PointerTracking.cpp	Rename isLoopGuardedByCond to isLoopEntryGuardedByCond, to emphasise	2010-04-11 19:27:13 +00:00
PostDominators.cpp
ProfileEstimatorPass.cpp
ProfileInfo.cpp
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp
ProfileVerifierPass.cpp
README.txt
ScalarEvolution.cpp	Fix indentation.	2010-04-11 23:44:58 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	When emitting code for an add, don't force a SCEVUnknown wrapper around	2010-04-09 19:14:31 +00:00
ScalarEvolutionNormalization.cpp	Generalize IVUsers to track arbitrary expressions rather than expressions	2010-04-07 22:27:08 +00:00
SparsePropagation.cpp
Trace.cpp
ValueTracking.cpp

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.

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