6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-10-02 17:55:18 +00:00
Code Issues Projects Releases Wiki Activity
2e816f0d56
llvm-6502/lib/Analysis
History
Chandler Carruth 2e816f0d56 [C++11] Make this interface accept const Use pointers and use override 
to ensure we don't mess up any of the overrides. Necessary for cleaning
up the Value use iterators and enabling range-based traversing of use
lists.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202958 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-05 10:21:48 +00:00
..
IPA [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
AliasAnalysis.cpp [C++11] Make this interface accept const Use pointers and use override 2014-03-05 10:21:48 +00:00
AliasAnalysisCounter.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
AliasAnalysisEvaluator.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
AliasDebugger.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
AliasSetTracker.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
Analysis.cpp
BasicAliasAnalysis.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
BlockFrequencyInfo.cpp [Modules] Move CFG.h to the IR library as it defines graph traits over 2014-03-04 11:45:46 +00:00
BranchProbabilityInfo.cpp [Modules] Move CFG.h to the IR library as it defines graph traits over 2014-03-04 11:45:46 +00:00
CaptureTracking.cpp [C++11] Make this interface accept const Use pointers and use override 2014-03-05 10:21:48 +00:00
CFG.cpp
CFGPrinter.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
CMakeLists.txt
CodeMetrics.cpp
ConstantFolding.cpp Allow constant folding of fma and fmuladd 2014-03-05 00:02:00 +00:00
CostModel.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
Delinearization.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
DependenceAnalysis.cpp
DominanceFrontier.cpp
DomPrinter.cpp
InstCount.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
InstructionSimplify.cpp [Modules] Move the ConstantRange class into the IR library. This is 2014-03-04 12:24:34 +00:00
Interval.cpp [Modules] Move CFG.h to the IR library as it defines graph traits over 2014-03-04 11:45:46 +00:00
IntervalPartition.cpp
IVUsers.cpp
LazyCallGraph.cpp
LazyValueInfo.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
LLVMBuild.txt
Loads.cpp
LoopInfo.cpp [Modules] Move CFG.h to the IR library as it defines graph traits over 2014-03-04 11:45:46 +00:00
LoopPass.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
Makefile
MemDepPrinter.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp [Modules] Move the PredIteratorCache into the IR library -- it is 2014-03-04 12:09:19 +00:00
ModuleDebugInfoPrinter.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
NoAliasAnalysis.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
PHITransAddr.cpp
PostDominators.cpp [Modules] Move CFG.h to the IR library as it defines graph traits over 2014-03-04 11:45:46 +00:00
PtrUseVisitor.cpp
README.txt
RegionInfo.cpp
RegionPass.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
RegionPrinter.cpp
ScalarEvolution.cpp [Modules] Move the ConstantRange class into the IR library. This is 2014-03-04 12:24:34 +00:00
ScalarEvolutionAliasAnalysis.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
ScalarEvolutionExpander.cpp
ScalarEvolutionNormalization.cpp
SparsePropagation.cpp
TargetTransformInfo.cpp
Trace.cpp
TypeBasedAliasAnalysis.cpp [C++11] Add 'override' keyword to virtual methods that override their base class. 2014-03-05 07:30:04 +00:00
ValueTracking.cpp [Modules] Move the ConstantRange class into the IR library. This is 2014-03-04 12:24:34 +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.

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

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))

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