llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-26 21:32:10 +00:00

History

Chris Lattner 304076268a teach memdep to do trivial PHI translation of GEPs. More to come. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89979 91177308-0d34-0410-b5e6-96231b3b80d8		2009-11-27 00:07:37 +00:00
..
IPA
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
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp
BasicAliasAnalysis.cpp	move DecomposeGEPExpression out into ValueTracking.cpp	2009-11-26 17:12:50 +00:00
CaptureTracking.cpp
CFGPrinter.cpp
CMakeLists.txt
ConstantFolding.cpp
DbgInfoPrinter.cpp
DebugInfo.cpp	Use StringRef (again) in DebugInfo interface.	2009-11-25 17:36:49 +00:00
DomPrinter.cpp
InlineCost.cpp
InstCount.cpp
InstructionSimplify.cpp	move some generally useful functions out of jump threading	2009-11-10 22:26:15 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	enable iv-users simplification by default	2009-11-23 23:25:54 +00:00
LazyValueInfo.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
LiveValues.cpp
LoopDependenceAnalysis.cpp
LoopInfo.cpp
LoopPass.cpp
Makefile
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp	teach memdep to do trivial PHI translation of GEPs. More to	2009-11-27 00:07:37 +00:00
PointerTracking.cpp
PostDominators.cpp
ProfileEstimatorPass.cpp
ProfileInfo.cpp
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp
ProfileVerifierPass.cpp
README.txt
ScalarEvolution.cpp
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp
SparsePropagation.cpp
Trace.cpp
ValueTracking.cpp	Implement PR1143 (at -m64) by making basicaa look through extensions. We	2009-11-26 18:53:33 +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.

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