llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-10-03 08:55:51 +00:00

History

Chris Lattner 9a8641201b checkpoint of the new PHITransAddr code, still not done and not used by anything. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90779 91177308-0d34-0410-b5e6-96231b3b80d8		2009-12-07 18:36:53 +00:00
..
IPA	Remove the AliasAnalysis::getMustAliases method, which is dead.	2009-11-22 16:01:44 +00:00
AliasAnalysis.cpp	use the new isNoAlias method to simplify some code, only do an escaping check if	2009-11-23 16:46:41 +00:00
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp	Remove the AliasAnalysis::getMustAliases method, which is dead.	2009-11-22 16:01:44 +00:00
AliasSetTracker.cpp	Remove the AliasAnalysis::getMustAliases method, which is dead.	2009-11-22 16:01:44 +00:00
Analysis.cpp
BasicAliasAnalysis.cpp	move DecomposeGEPExpression out into ValueTracking.cpp	2009-11-26 17:12:50 +00:00
CaptureTracking.cpp	Use stripPointerCasts(). Thanks Duncan!	2009-11-20 19:33:16 +00:00
CFGPrinter.cpp
CMakeLists.txt	add to cmake	2009-12-04 04:15:36 +00:00
ConstantFolding.cpp	Fix PR5551 by not ignoring the top level constantexpr when	2009-12-04 06:29:29 +00:00
DbgInfoPrinter.cpp
DebugInfo.cpp	Add support to emit debug info for virtual functions and virtual base classes.	2009-12-03 19:11:07 +00:00
DomPrinter.cpp	Remove ShortNames from getNodeLabel in DOTGraphTraits	2009-11-30 12:38:47 +00:00
InlineCost.cpp
InstCount.cpp
InstructionSimplify.cpp	factor some logic out of instcombine into a new SimplifyAddInst method.	2009-11-27 17:42:22 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	enable iv-users simplification by default	2009-11-23 23:25:54 +00:00
LazyValueInfo.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
LiveValues.cpp
LoopDependenceAnalysis.cpp
LoopInfo.cpp	Teach getSmallConstantTripMultiple about Shl operators.	2009-11-20 01:09:34 +00:00
LoopPass.cpp
Makefile	Removed trailing whitespace from Makefiles.	2009-01-09 16:44:42 +00:00
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp	Fix indentation in switch statement.	2009-12-05 06:37:24 +00:00
PHITransAddr.cpp	checkpoint of the new PHITransAddr code, still not done and not used by	2009-12-07 18:36:53 +00:00
PointerTracking.cpp
PostDominators.cpp
ProfileEstimatorPass.cpp	Fix MSVC build.	2009-12-03 13:23:03 +00:00
ProfileInfo.cpp	Converted ProfileInfo to template, added more API for ProfileInfo-preserving.	2009-12-03 09:30:12 +00:00
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp	Use ProfileInfo-API in ProfileInfo Loader and do more assertions.	2009-12-03 11:00:37 +00:00
ProfileVerifierPass.cpp	Convert ProfileVerifier to template so it can be used for different types of ProfileInfo.	2009-12-03 12:55:57 +00:00
README.txt
ScalarEvolution.cpp	Remove dead LLVMContext argument.	2009-11-23 03:26:09 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	Fix a comment typo.	2009-12-04 01:33:04 +00:00
SparsePropagation.cpp
Trace.cpp
ValueTracking.cpp	Fixed an assertion failure for tracking sext of a vector of integers	2009-12-02 04:59:58 +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.

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