llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-16 11:30:51 +00:00

History

Benjamin Kramer a80ff26688 Add override to overriden virtual methods, remove virtual keywords. No functionality change. Changes made by clang-tidy + some manual cleanup. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217028 91177308-0d34-0410-b5e6-96231b3b80d8		2014-09-03 11:41:21 +00:00
..
IPA
AliasAnalysis.cpp
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp	Add a CFL Alias Analysis implementation	2014-09-02 21:43:13 +00:00
BasicAliasAnalysis.cpp	Use range based for loops to avoid needing to re-mention SmallPtrSet size.	2014-08-24 23:23:06 +00:00
BlockFrequencyInfo.cpp
BlockFrequencyInfoImpl.cpp
BranchProbabilityInfo.cpp
CaptureTracking.cpp
CFG.cpp
CFGPrinter.cpp	Modernize raw_fd_ostream's constructor a bit.	2014-08-25 18:16:47 +00:00
CFLAliasAnalysis.cpp	[CFLAA] Remove one final initializer list	2014-09-03 00:06:47 +00:00
CGSCCPassManager.cpp
CMakeLists.txt	Add a CFL Alias Analysis implementation	2014-09-02 21:43:13 +00:00
CodeMetrics.cpp
ConstantFolding.cpp	Repace SmallPtrSet with SmallPtrSetImpl in function arguments to avoid needing to mention the size.	2014-08-21 05:55:13 +00:00
CostModel.cpp
Delinearization.cpp
DependenceAnalysis.cpp	Analysis: cleanup	2014-08-26 02:03:40 +00:00
DominanceFrontier.cpp
DomPrinter.cpp
InstCount.cpp
InstructionSimplify.cpp	InstSimplify: Move a transform from InstCombine to InstSimplify	2014-08-28 03:34:28 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	Repace SmallPtrSet with SmallPtrSetImpl in function arguments to avoid needing to mention the size.	2014-08-21 05:55:13 +00:00
JumpInstrTableInfo.cpp
LazyCallGraph.cpp
LazyValueInfo.cpp	In LVI(Lazy Value Info), originally value on a BB can only be caculated once,	2014-08-11 05:02:04 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp	Repace SmallPtrSet with SmallPtrSetImpl in function arguments to avoid needing to mention the size.	2014-08-21 05:55:13 +00:00
LLVMBuild.txt
Loads.cpp
LoopInfo.cpp
LoopPass.cpp
Makefile
MemDepPrinter.cpp
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp	Fix MemoryDependenceAnalysis in cases where QueryInstr is a CmpXchg or a AtomicRMW	2014-09-02 20:17:52 +00:00
ModuleDebugInfoPrinter.cpp
NoAliasAnalysis.cpp
PHITransAddr.cpp
PostDominators.cpp
PtrUseVisitor.cpp
README.txt
RegionInfo.cpp
RegionPass.cpp
RegionPrinter.cpp
ScalarEvolution.cpp	Remove an errant outer loop that contains nothing but an inner loop over exactly the same elements. While no functionality is change intended (and hence there are no changes to tests), you don't want to skip this revision if bisecting for errors.	2014-09-01 05:17:15 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp
ScalarEvolutionNormalization.cpp	Fix typos in comments, NFC	2014-08-29 21:53:01 +00:00
ScopedNoAliasAA.cpp	Add override to overriden virtual methods, remove virtual keywords.	2014-09-03 11:41:21 +00:00
SparsePropagation.cpp
StratifiedSets.h	[CFLAA] And even more MSVC fixes	2014-09-02 23:50:01 +00:00
TargetTransformInfo.cpp	Remove 'virtual' keyword from methods markedwith 'override' keyword.	2014-08-30 16:48:34 +00:00
Trace.cpp
TypeBasedAliasAnalysis.cpp
ValueTracking.cpp	Make fabs safe to speculatively execute	2014-08-29 16:01:17 +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))

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