llvm-6502/lib/Analysis
Dan Gohman 65924111bf Add a new experimental generalized dependence query interface to
AliasAnalysis, and some code for implementing the new query on top of
existing implementations by making standard alias and getModRefInfo
queries.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113329 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-08 01:32:20 +00:00
..
IPA dead method. 2010-09-04 18:19:16 +00:00
AliasAnalysis.cpp Add a new experimental generalized dependence query interface to 2010-09-08 01:32:20 +00:00
AliasAnalysisCounter.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +00:00
AliasAnalysisEvaluator.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +00:00
AliasDebugger.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +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 Add a new experimental generalized dependence query interface to 2010-09-08 01:32:20 +00:00
CaptureTracking.cpp
CFGPrinter.cpp zap dead code. 2010-09-04 18:12:00 +00:00
CMakeLists.txt
ConstantFolding.cpp
DbgInfoPrinter.cpp Convert DbgInfoPrinter to use errs() instead of outs(). 2010-08-20 18:03:05 +00:00
DebugInfo.cpp Let FE use derived types for DW_TAG_friend. 2010-08-23 23:16:25 +00:00
DomPrinter.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +00:00
InlineCost.cpp
InstCount.cpp Revert r111082. No warnings for this common pattern. 2010-08-15 10:27:23 +00:00
InstructionSimplify.cpp
Interval.cpp
IntervalPartition.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +00:00
IVUsers.cpp stop forcing a noop AssemblyAnnotationWriter to silence #uses 2010-09-02 23:03:10 +00:00
LazyValueInfo.cpp Clean up some of the PassRegistry implementation, and pImpl-ize it to reduce #include clutter 2010-09-07 19:16:25 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp zap dead code. 2010-09-04 18:12:00 +00:00
LiveValues.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +00:00
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
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp cleanup some of the lifetime/invariant marker stuff, add a big fixme. 2010-09-06 03:58:04 +00:00
ModuleDebugInfoPrinter.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +00:00
PHITransAddr.cpp
PointerTracking.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +00:00
PostDominators.cpp
ProfileEstimatorPass.cpp Now that PassInfo and Pass::ID have been separated, move the rest of the passes over to the new registration API. 2010-08-23 17:52:01 +00:00
ProfileInfo.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +00:00
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp Now that PassInfo and Pass::ID have been separated, move the rest of the passes over to the new registration API. 2010-08-23 17:52:01 +00:00
ProfileVerifierPass.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +00:00
README.txt
RegionInfo.cpp RegionInfo: Do not assert if a BB is not part of the dominance tree. 2010-08-10 09:54:35 +00:00
RegionPrinter.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +00:00
ScalarEvolution.cpp Reapply r112432, now that the real problem is addressed. 2010-08-31 22:53:17 +00:00
ScalarEvolutionAliasAnalysis.cpp Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +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 Reapply r110396, with fixes to appease the Linux buildbot gods. 2010-08-06 18:33:48 +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))

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