llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-10-02 17:55:18 +00:00

History

Benjamin Kramer a4f0aad951 [C++11] Replace llvm::tie with std::tie. The old implementation is no longer needed in C++11. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202644 91177308-0d34-0410-b5e6-96231b3b80d8		2014-03-02 13:30:33 +00:00
..
IPA	[C++11] Replace llvm::tie with std::tie.	2014-03-02 13:30:33 +00:00
AliasAnalysis.cpp	Make DataLayout a plain object, not a pass.	2014-02-25 17:30:31 +00:00
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp
BasicAliasAnalysis.cpp
BlockFrequencyInfo.cpp
BranchProbabilityInfo.cpp
CaptureTracking.cpp
CFG.cpp
CFGPrinter.cpp
CMakeLists.txt
CodeMetrics.cpp
ConstantFolding.cpp
CostModel.cpp	[C++11] Replace llvm::tie with std::tie.	2014-03-02 13:30:33 +00:00
Delinearization.cpp
DependenceAnalysis.cpp
DominanceFrontier.cpp
DomPrinter.cpp
InstCount.cpp
InstructionSimplify.cpp
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	Make DataLayout a plain object, not a pass.	2014-02-25 17:30:31 +00:00
LazyCallGraph.cpp	[C++11] Remove the use of LLVM_HAS_RVALUE_REFERENCES from the rest of	2014-03-01 09:32:03 +00:00
LazyValueInfo.cpp	Make DataLayout a plain object, not a pass.	2014-02-25 17:30:31 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp	[C++11] Replace llvm::next and llvm::prior with std::next and std::prev.	2014-03-02 12:27:27 +00:00
LLVMBuild.txt
Loads.cpp
LoopInfo.cpp	[C++11] Replace llvm::next and llvm::prior with std::next and std::prev.	2014-03-02 12:27:27 +00:00
LoopPass.cpp	Constify the Optnone checks in IR passes.	2014-02-26 01:23:26 +00:00
Makefile
MemDepPrinter.cpp
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp	[C++11] Replace llvm::next and llvm::prior with std::next and std::prev.	2014-03-02 12:27:27 +00:00
ModuleDebugInfoPrinter.cpp
NoAliasAnalysis.cpp	Make DataLayout a plain object, not a pass.	2014-02-25 17:30:31 +00:00
PHITransAddr.cpp
PostDominators.cpp
PtrUseVisitor.cpp	[C++11] Switch all uses of the llvm_move macro to use std::move	2014-03-02 04:08:41 +00:00
README.txt
RegionInfo.cpp
RegionPass.cpp
RegionPrinter.cpp
ScalarEvolution.cpp	[C++11] Replace llvm::next and llvm::prior with std::next and std::prev.	2014-03-02 12:27:27 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	[C++11] Replace llvm::next and llvm::prior with std::next and std::prev.	2014-03-02 12:27:27 +00:00
ScalarEvolutionNormalization.cpp
SparsePropagation.cpp
TargetTransformInfo.cpp	Switch all uses of LLVM_OVERRIDE to just use 'override' directly.	2014-03-02 09:09:27 +00:00
Trace.cpp
TypeBasedAliasAnalysis.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.

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

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))

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