llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-02 22:04:55 +00:00

History

Chandler Carruth 1b279144ec [cleanup] Re-sort all the #include lines in LLVM using utils/sort_includes.py. I clearly haven't done this in a while, so more changed than usual. This even uncovered a missing include from the InstrProf library that I've added. No functionality changed here, just mechanical cleanup of the include order. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225974 91177308-0d34-0410-b5e6-96231b3b80d8		2015-01-14 11:23:27 +00:00
..
IPA	[cleanup] Re-sort all the #include lines in LLVM using	2015-01-14 11:23:27 +00:00
AliasAnalysis.cpp
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp
AssumptionCache.cpp	[PM] Split the AssumptionTracker immutable pass into two separate APIs:	2015-01-04 12:03:27 +00:00
BasicAliasAnalysis.cpp	[PM] Split the AssumptionTracker immutable pass into two separate APIs:	2015-01-04 12:03:27 +00:00
BlockFrequencyInfo.cpp
BlockFrequencyInfoImpl.cpp
BranchProbabilityInfo.cpp
CaptureTracking.cpp	[cleanup] Re-sort all the #include lines in LLVM using	2015-01-14 11:23:27 +00:00
CFG.cpp	Standardize {pred,succ,use,user}_empty()	2015-01-13 03:46:47 +00:00
CFGPrinter.cpp
CFLAliasAnalysis.cpp	[cleanup] Re-sort all the #include lines in LLVM using	2015-01-14 11:23:27 +00:00
CGSCCPassManager.cpp	[PM] Remove the defunt CGSCC-specific debug flag.	2015-01-13 22:45:13 +00:00
CMakeLists.txt	[PM] Split the AssumptionTracker immutable pass into two separate APIs:	2015-01-04 12:03:27 +00:00
CodeMetrics.cpp	[PM] Split the AssumptionTracker immutable pass into two separate APIs:	2015-01-04 12:03:27 +00:00
ConstantFolding.cpp
CostModel.cpp
Delinearization.cpp
DependenceAnalysis.cpp
DominanceFrontier.cpp
DomPrinter.cpp
FunctionTargetTransformInfo.cpp
InstCount.cpp
InstructionSimplify.cpp	[PM] Split the AssumptionTracker immutable pass into two separate APIs:	2015-01-04 12:03:27 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp
JumpInstrTableInfo.cpp
LazyCallGraph.cpp	Revert r225854: [PM] Move the LazyCallGraph printing functionality to	2015-01-14 00:27:45 +00:00
LazyValueInfo.cpp	remove names from comments; NFC	2015-01-09 16:47:20 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp	[PM] Split the AssumptionTracker immutable pass into two separate APIs:	2015-01-04 12:03:27 +00:00
LLVMBuild.txt
Loads.cpp
LoopInfo.cpp
LoopPass.cpp
Makefile
MemDepPrinter.cpp	[REFACTOR] Push logic from MemDepPrinter into getNonLocalPointerDependency	2015-01-09 00:26:45 +00:00
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp	[REFACTOR] Push logic from MemDepPrinter into getNonLocalPointerDependency	2015-01-09 00:26:45 +00:00
ModuleDebugInfoPrinter.cpp
NoAliasAnalysis.cpp
PHITransAddr.cpp	[PM] Split the AssumptionTracker immutable pass into two separate APIs:	2015-01-04 12:03:27 +00:00
PostDominators.cpp
PtrUseVisitor.cpp
README.txt
RegionInfo.cpp	[cleanup] Re-sort all the #include lines in LLVM using	2015-01-14 11:23:27 +00:00
RegionPass.cpp	[cleanup] Re-sort all the #include lines in LLVM using	2015-01-14 11:23:27 +00:00
RegionPrinter.cpp
ScalarEvolution.cpp	Fix PR22179.	2015-01-10 23:41:24 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	[PM] Split the AssumptionTracker immutable pass into two separate APIs:	2015-01-04 12:03:27 +00:00
ScalarEvolutionNormalization.cpp
ScopedNoAliasAA.cpp	[cleanup] Re-sort all the #include lines in LLVM using	2015-01-14 11:23:27 +00:00
SparsePropagation.cpp
StratifiedSets.h
TargetTransformInfo.cpp	Remove empty statement. No functionality change.	2015-01-08 00:47:03 +00:00
Trace.cpp
TypeBasedAliasAnalysis.cpp
ValueTracking.cpp	[cleanup] Re-sort all the #include lines in LLVM using	2015-01-14 11:23:27 +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))

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