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llvm-6502/lib/Analysis
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Duncan Sands 7cf85e74e3 Fix a README item by having InstructionSimplify do a mild form of value 
numbering, in which it considers (for example) "%a = add i32 %x, %y" and
"%b = add i32 %x, %y" to be equal because the operands are equal and the
result of the instructions only depends on the values of the operands.
This has almost no effect (it removes 4 instructions from gcc-as-one-file),
and perhaps slows down compilation: I measured a 0.4% slowdown on the large
gcc-as-one-file testcase, but it wasn't statistically significant.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122654 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-01 16:12:09 +00:00
..
IPA
Move Value::getUnderlyingObject to be a standalone
2010-12-15 20:02:24 +00:00
AliasAnalysis.cpp
Make memcpyopt TBAA-aware.
2010-12-16 02:51:19 +00:00
AliasAnalysisCounter.cpp
Teach AliasAnalysisCounter about PartialAlias.
2010-12-10 19:53:05 +00:00
AliasAnalysisEvaluator.cpp
Teach AliasAnalysisEvaluator about PartialAlias.
2010-12-10 19:52:40 +00:00
AliasDebugger.cpp
Extend the AliasAnalysis::pointsToConstantMemory interface to allow it
2010-11-08 16:45:26 +00:00
AliasSetTracker.cpp
Update this code to handle PartialAlias as MayAlias.
2010-12-10 19:40:47 +00:00
Analysis.cpp
Add initialization routines for Analysis and IPA.
2010-10-07 18:31:00 +00:00
BasicAliasAnalysis.cpp
Reapply r121886, and also update DecomposeGEPExpression to keep
2010-12-15 20:49:55 +00:00
CaptureTracking.cpp
VAArg doesn't capture its operand.
2010-11-09 20:09:35 +00:00
CFGPrinter.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
CMakeLists.txt
Introduce DIBuilder. It is intended to be a front-end friendly interface to emit debuggging information entries in LLVM IR.
2010-11-04 15:01:38 +00:00
ConstantFolding.cpp
Change all self assignments X=X to (void)X, so that we can turn on a
2010-12-23 00:58:24 +00:00
DbgInfoPrinter.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
DebugInfo.cpp
Add support to create class type.
2010-12-08 20:18:20 +00:00
DIBuilder.cpp
Use type's file info while describing inheritance relationship.
2010-12-08 21:46:37 +00:00
DomPrinter.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
InlineCost.cpp
Now using a variant of the existing inlining heuristics to decide whether to create a given specialization of a function in PartialSpecialization. If the total performance bonus across all callsites passing the same constant exceeds the specialization cost, we create the specialization.
2010-10-09 22:06:36 +00:00
InstCount.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
InstructionSimplify.cpp
Fix a README item by having InstructionSimplify do a mild form of value
2011-01-01 16:12:09 +00:00
Interval.cpp
Change Pass::print to take a raw ostream instead of std::ostream,
2009-08-23 06:03:38 +00:00
IntervalPartition.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
IVUsers.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
LazyValueInfo.cpp
Speculatively revert the use of DenseMap in LazyValueInfo, which may be causing Linux self-host failures.
2010-12-20 23:53:19 +00:00
LibCallAliasAnalysis.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
LibCallSemantics.cpp
Thread const correctness through a bunch of AliasAnalysis interfaces and
2010-08-03 21:48:53 +00:00
Lint.cpp
Move Value::getUnderlyingObject to be a standalone
2010-12-15 20:02:24 +00:00
LiveValues.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
Loads.cpp
Move Value::getUnderlyingObject to be a standalone
2010-12-15 20:02:24 +00:00
LoopDependenceAnalysis.cpp
Move Value::getUnderlyingObject to be a standalone
2010-12-15 20:02:24 +00:00
LoopInfo.cpp
Fix typo pointed out by Trevor Harmon.
2010-11-13 12:16:27 +00:00
LoopPass.cpp
zap dead code.
2010-09-04 18:12:00 +00:00
Makefile
make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.
2010-01-24 20:43:08 +00:00
MemDepPrinter.cpp
Add helper functions for computing the Location of load, store,
2010-11-11 21:50:19 +00:00
MemoryBuiltins.cpp
minor enhancement to llvm::isFreeCall API: return CallInst; no functional change
2010-06-23 21:51:12 +00:00
MemoryDependenceAnalysis.cpp
Change all self assignments X=X to (void)X, so that we can turn on a
2010-12-23 00:58:24 +00:00
ModuleDebugInfoPrinter.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
NoAliasAnalysis.cpp
Extend the AliasAnalysis::pointsToConstantMemory interface to allow it
2010-11-08 16:45:26 +00:00
PHITransAddr.cpp
Strip trailing whitespace.
2010-11-18 17:06:31 +00:00
PostDominators.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
ProfileEstimatorPass.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
ProfileInfo.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
ProfileInfoLoader.cpp
Reapplied r81355 with the problems fixed.
2009-09-16 11:35:50 +00:00
ProfileInfoLoaderPass.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
ProfileVerifierPass.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
README.txt
When checking whether the special handling for an addrec increment which
2010-04-26 21:46:36 +00:00
RegionInfo.cpp
Make some symbols static, move classes into anonymous namespaces.
2010-10-22 17:35:07 +00:00
RegionPass.cpp
Remove useless dynamic_cast<>().
2010-12-12 21:58:28 +00:00
RegionPrinter.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
ScalarEvolution.cpp
PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and
2010-12-07 08:25:19 +00:00
ScalarEvolutionAliasAnalysis.cpp
Get rid of static constructors for pass registration. Instead, every pass exposes an initializeMyPassFunction(), which
2010-10-19 17:21:58 +00:00
ScalarEvolutionExpander.cpp
Introduce memoization for ScalarEvolution dominates and properlyDominates
2010-11-18 00:34:22 +00:00
ScalarEvolutionNormalization.cpp
Disable the asserts that check that normalization is perfectly
2010-09-03 22:12:56 +00:00
SparsePropagation.cpp
Convert debug messages to use dbgs(). Generally this means
2009-12-23 22:28:01 +00:00
Trace.cpp
Convert debug messages to use dbgs(). Generally this means
2009-12-23 22:35:10 +00:00
TypeBasedAliasAnalysis.cpp
Update a comment.
2010-12-16 02:55:10 +00:00
ValueTracking.cpp
move isBytewiseValue out to ValueTracking.h/cpp
2010-12-26 20:15:01 +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))

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