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llvm-6502/lib/Analysis
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Hal Finkel a7a02cb737 Use TopTTI->getGEPCost from within getUserCost 
The implementation of getUserCost had duplicated (and hard-coded) the default
logic in getGEPCost. Instead, it is better to use getGEPCost directly, which
limits the default logic to the implementation of one function, and allows
targets to override the behavior.

No functionality change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205346 91177308-0d34-0410-b5e6-96231b3b80d8
2014-04-01 18:50:06 +00:00
..
IPA Consistent use of the noduplicate attribute. 2014-03-17 16:19:07 +00:00
AliasAnalysis.cpp IR: add a second ordering operand to cmpxhg for failure 2014-03-11 10:48:52 +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 PR15967 Fix in basicaa for faulty returning no alias. 2014-03-26 21:30:19 +00:00
BlockFrequencyInfo.cpp blockfreq: Implement Pass::releaseMemory() 2014-03-25 18:01:38 +00:00
BranchProbabilityInfo.cpp
CaptureTracking.cpp [C++11] Add range based accessors for the Use-Def chain of a Value. 2014-03-09 03:16:01 +00:00
CFG.cpp Simplify loop that worked around bugs in old GCC/Xcode. 2014-03-25 09:06:18 +00:00
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 Consistent use of the noduplicate attribute. 2014-03-17 16:19:07 +00:00
ConstantFolding.cpp Allow constant folding of ceil function whenever feasible 2014-03-24 04:36:06 +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 [Layering] Move InstVisitor.h into the IR library as it is pretty 2014-03-06 03:23:41 +00:00
InstructionSimplify.cpp [C++11] Add range based accessors for the Use-Def chain of a Value. 2014-03-09 03:16:01 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp PR17473: 2014-03-12 21:31:05 +00:00
LazyCallGraph.cpp [LCG] Ran clang-format over this too and it pointed out some fixes. 2014-03-10 02:14:14 +00:00
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 Teach lint about address spaces 2014-03-06 17:33:55 +00:00
LLVMBuild.txt
Loads.cpp
LoopInfo.cpp Consistent use of the noduplicate attribute. 2014-03-17 16:19:07 +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 [C++11] Add range based accessors for the Use-Def chain of a Value. 2014-03-09 03:16:01 +00:00
MemoryDependenceAnalysis.cpp Replace OwningPtr<T> with std::unique_ptr<T>. 2014-03-06 05:51:42 +00:00
ModuleDebugInfoPrinter.cpp [C++11] Change DebugInfoFinder to use range-based loops 2014-03-18 09:41:07 +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 [C++11] Add range based accessors for the Use-Def chain of a Value. 2014-03-09 03:16:01 +00:00
PostDominators.cpp
PtrUseVisitor.cpp [C++11] Add range based accessors for the Use-Def chain of a Value. 2014-03-09 03:16:01 +00:00
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 ScalarEvolution: Compute exit counts for loops with a power-of-2 step. 2014-03-25 16:25:12 +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 [C++11] Add range based accessors for the Use-Def chain of a Value. 2014-03-09 03:16:01 +00:00
ScalarEvolutionNormalization.cpp Add stride normalization to SCEV Normalize/Denormalize transformation. 2014-03-18 17:34:03 +00:00
SparsePropagation.cpp [C++11] Add range based accessors for the Use-Def chain of a Value. 2014-03-09 03:16:01 +00:00
TargetTransformInfo.cpp Use TopTTI->getGEPCost from within getUserCost 2014-04-01 18:50:06 +00:00
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 [C++11] Add range based accessors for the Use-Def chain of a Value. 2014-03-09 03:16:01 +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))

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