llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-10 17:07:06 +00:00

History

…
..
IPA
AliasAnalysis.cpp	Remove interprocedural-basic-aa and associated code. The AliasAnalysis	2010-07-07 14:27:09 +00:00
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp	Fix AliasDebugger to be aware of operand values too.	2010-05-28 22:31:51 +00:00
AliasSetTracker.cpp
Analysis.cpp
BasicAliasAnalysis.cpp
CaptureTracking.cpp
CFGPrinter.cpp
CMakeLists.txt
ConstantFolding.cpp
DbgInfoPrinter.cpp
DebugInfo.cpp
DomPrinter.cpp
InlineCost.cpp
InstCount.cpp	Change dbgs() back to errs() as Chris requested.	2009-12-23 23:29:28 +00:00
InstructionSimplify.cpp
Interval.cpp	Change Pass::print to take a raw ostream instead of std::ostream,	2009-08-23 06:03:38 +00:00
IntervalPartition.cpp
IVUsers.cpp	Remove the Expr member from IVUsers. Instead of remembering the expression,	2010-04-19 21:48:58 +00:00
LazyValueInfo.cpp
LibCallAliasAnalysis.cpp	LibCallAliasAnalysis doesn't use TargetData.	2009-07-31 20:56:29 +00:00
LibCallSemantics.cpp
Lint.cpp	Add a lint check for mismatched return types, inspired by PR6944.	2010-07-12 18:02:04 +00:00
LiveValues.cpp	rename use_const_iterator to const_use_iterator for consistency's sake	2010-03-25 23:06:16 +00:00
Loads.cpp	Move FindAvailableLoadedValue isSafeToLoadUnconditionally out of	2010-05-28 16:19:17 +00:00
LoopDependenceAnalysis.cpp
LoopInfo.cpp	cache result of operator*	2010-07-09 14:28:41 +00:00
LoopPass.cpp
Makefile
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp
ModuleDebugInfoPrinter.cpp
PHITransAddr.cpp
PointerTracking.cpp
PostDominators.cpp	cache result of operator*	2010-07-09 15:52:36 +00:00
ProfileEstimatorPass.cpp
ProfileInfo.cpp
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp	rename pred_const_iterator to const_pred_iterator for consistency's sake	2010-03-25 23:25:28 +00:00
ProfileVerifierPass.cpp
README.txt	When checking whether the special handling for an addrec increment which	2010-04-26 21:46:36 +00:00
ScalarEvolution.cpp
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp
ScalarEvolutionNormalization.cpp
SparsePropagation.cpp
Trace.cpp
ValueTracking.cpp	use ArgOperand accessors	2010-06-23 23:38:07 +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))

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