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llvm/lib/Analysis
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Chris Lattner eafc5cb80d add uadd_ov/usub_ov to apint, consolidate constant folding 
logic to use the new APInt methods.  Among other things this
implements rdar://8501501 - llvm.smul.with.overflow.i32 should constant fold

which comes from "clang -ftrapv", originally brought to my attention from PR8221.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116457 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-14 00:05:07 +00:00
..
IPA
Analysis groups need to initialize their default implementations.
2010-10-13 21:49:58 +00:00
AliasAnalysis.cpp
Analysis groups need to initialize their default implementations.
2010-10-13 21:49:58 +00:00
AliasAnalysisCounter.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
AliasAnalysisEvaluator.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
AliasDebugger.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
AliasSetTracker.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
Analysis.cpp
Add initialization routines for Analysis and IPA.
2010-10-07 18:31:00 +00:00
BasicAliasAnalysis.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
CaptureTracking.cpp
simplify
2010-07-28 10:57:28 +00:00
CFGPrinter.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
CMakeLists.txt
Remove PointerTracking from cmakelists …
2010-09-29 19:39:50 +00:00
ConstantFolding.cpp
add uadd_ov/usub_ov to apint, consolidate constant folding
2010-10-14 00:05:07 +00:00
DbgInfoPrinter.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
DebugInfo.cpp
Add support for DW_TAG_unspecified_parameters.
2010-10-06 20:50:40 +00:00
DomPrinter.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +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
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
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
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
IVUsers.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
LazyValueInfo.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +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
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
LiveValues.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
Loads.cpp
…
LoopDependenceAnalysis.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
LoopInfo.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
LoopPass.cpp
zap dead code.
2010-09-04 18:12:00 +00:00
Makefile
…
MemDepPrinter.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
MemoryBuiltins.cpp
…
MemoryDependenceAnalysis.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
ModuleDebugInfoPrinter.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
PHITransAddr.cpp
…
PostDominators.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
ProfileEstimatorPass.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
ProfileInfo.cpp
Analysis groups need to initialize their default implementations.
2010-10-13 21:49:58 +00:00
ProfileInfoLoader.cpp
…
ProfileInfoLoaderPass.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
ProfileVerifierPass.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
README.txt
…
RegionInfo.cpp
Add Region::isTopLevelRegion().
2010-10-13 11:02:44 +00:00
RegionPrinter.cpp
Now with fewer extraneous semicolons!
2010-10-07 22:25:06 +00:00
ScalarEvolution.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
ScalarEvolutionAliasAnalysis.cpp
Begin adding static dependence information to passes, which will allow us to
2010-10-12 19:48:12 +00:00
ScalarEvolutionExpander.cpp
Fix SCEVExpander::visitAddRecExpr so that it remembers the induction variable
2010-07-26 18:28:14 +00:00
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
Support AA chaining.
2010-10-11 23:39:34 +00:00
ValueTracking.cpp
fix PR8063, a crash in globalopt in the malloc analysis code.
2010-09-05 17:20:46 +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))

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