llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-13 20:32:21 +00:00

History

Dan Gohman 39125d8ef9 Override dominates and properlyDominates for SCEVAddRecExpr, as a SCEVAddRecExpr doesn't necessarily dominate blocks merely dominated by all of its operands. This fixes an abort compiling 403.gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96056 91177308-0d34-0410-b5e6-96231b3b80d8		2010-02-13 00:19:39 +00:00
..
IPA	Fix "the the" and similar typos.	2010-02-10 16:03:48 +00:00
AliasAnalysis.cpp
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp
BasicAliasAnalysis.cpp
CaptureTracking.cpp
CFGPrinter.cpp
CMakeLists.txt
ConstantFolding.cpp	Add const qualifiers.	2010-02-08 22:00:06 +00:00
DbgInfoPrinter.cpp
DebugInfo.cpp	Set DW_AT_artificial only if argument is marked as artificial.	2010-02-06 01:02:37 +00:00
DomPrinter.cpp
InlineCost.cpp	Update CodeMetrics to count 'big' function calls explicitly.	2010-02-05 23:21:18 +00:00
InstCount.cpp
InstructionSimplify.cpp
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	Reapply the new LoopStrengthReduction code, with compile time and	2010-02-12 10:34:29 +00:00
LazyValueInfo.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
LiveValues.cpp	Fix "the the" and similar typos.	2010-02-10 16:03:48 +00:00
LoopDependenceAnalysis.cpp
LoopInfo.cpp
LoopPass.cpp
Makefile	make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.	2010-01-24 20:43:08 +00:00
MemoryBuiltins.cpp	Fix "the the" and similar typos.	2010-02-10 16:03:48 +00:00
MemoryDependenceAnalysis.cpp
PHITransAddr.cpp
PointerTracking.cpp
PostDominators.cpp
ProfileEstimatorPass.cpp
ProfileInfo.cpp
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp
ProfileVerifierPass.cpp
README.txt
ScalarEvolution.cpp	Override dominates and properlyDominates for SCEVAddRecExpr, as a	2010-02-13 00:19:39 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	Fix a case of mismatched types in an Add that turned up in 447.dealII.	2010-02-12 20:39:25 +00:00
SparsePropagation.cpp
Trace.cpp
ValueTracking.cpp	It looks like the changes to the SRem logic of SimplifyDemandedUseBits	2010-01-29 06:18:37 +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.

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