llvm-6502/lib/Analysis
2010-09-29 23:07:21 +00:00
..
IPA Remove the experimental AliasAnalysis::getDependency interface, which 2010-09-14 21:25:10 +00:00
AliasAnalysis.cpp Remove the experimental AliasAnalysis::getDependency interface, which 2010-09-14 21:25:10 +00:00
AliasAnalysisCounter.cpp Remove the experimental AliasAnalysis::getDependency interface, which 2010-09-14 21:25:10 +00:00
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp Remove the experimental AliasAnalysis::getDependency interface, which 2010-09-14 21:25:10 +00:00
AliasSetTracker.cpp Don't print two "0x" prefixes. Use a raw_ostream overload instead of llvm::format. 2010-08-30 14:46:53 +00:00
Analysis.cpp
BasicAliasAnalysis.cpp PR7959: Handle negative scales in GEPs correctly in BasicAA for non-64-bit 2010-09-15 20:08:03 +00:00
CaptureTracking.cpp
CFGPrinter.cpp zap dead code. 2010-09-04 18:12:00 +00:00
CMakeLists.txt Remove PointerTracking from cmakelists … 2010-09-29 19:39:50 +00:00
ConstantFolding.cpp Don't try to constant fold libm functions with non-finite arguments. 2010-09-27 21:29:20 +00:00
DbgInfoPrinter.cpp
DebugInfo.cpp Let FE mark a variable as artificial variable. 2010-09-29 23:07:21 +00:00
DomPrinter.cpp
InlineCost.cpp What the loop unroller cares about, rather than just not unrolling loops with calls, is 2010-09-09 20:32:23 +00:00
InstCount.cpp
InstructionSimplify.cpp Revert r114097, adding back in the assertion against replacing an Instruction by itself. Now that CorrelatedValuePropagation is 2010-09-16 20:51:41 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp stop forcing a noop AssemblyAnnotationWriter to silence #uses 2010-09-02 23:03:10 +00:00
LazyValueInfo.cpp It is possible, under specific circumstances involving ptrtoint ConstantExpr's, for LVI to end up trying to merge 2010-09-16 18:28:33 +00:00
LibCallAliasAnalysis.cpp Remove the experimental AliasAnalysis::getDependency interface, which 2010-09-14 21:25:10 +00:00
LibCallSemantics.cpp
Lint.cpp zap dead code. 2010-09-04 18:12:00 +00:00
LiveValues.cpp
Loads.cpp
LoopDependenceAnalysis.cpp
LoopInfo.cpp pull a simple method out of LICM into a new 2010-09-06 01:05:37 +00:00
LoopPass.cpp zap dead code. 2010-09-04 18:12:00 +00:00
Makefile
MemDepPrinter.cpp Add an #include of raw_ostream.h. Previously, this only compiled 2010-09-17 00:33:43 +00:00
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp Teach memdep about TBAA tags. 2010-09-22 21:41:02 +00:00
ModuleDebugInfoPrinter.cpp
PHITransAddr.cpp
PostDominators.cpp
ProfileEstimatorPass.cpp
ProfileInfo.cpp
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp
ProfileVerifierPass.cpp
README.txt
RegionInfo.cpp
RegionPrinter.cpp
ScalarEvolution.cpp Reapply r112432, now that the real problem is addressed. 2010-08-31 22:53:17 +00:00
ScalarEvolutionAliasAnalysis.cpp Remove the experimental AliasAnalysis::getDependency interface, which 2010-09-14 21:25:10 +00:00
ScalarEvolutionExpander.cpp
ScalarEvolutionNormalization.cpp Disable the asserts that check that normalization is perfectly 2010-09-03 22:12:56 +00:00
SparsePropagation.cpp
Trace.cpp
TypeBasedAliasAnalysis.cpp Convert TBAA to use the new TBAATag field of AliasAnalysis::Location. 2010-09-14 23:28:12 +00:00
ValueTracking.cpp fix PR8063, a crash in globalopt in the malloc analysis code. 2010-09-05 17:20:46 +00:00

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))

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