llvm-6502/lib/Analysis
Dan Gohman 6f205cbceb Fix whitespace style.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107175 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-29 18:12:34 +00:00
..
IPA Create new accessors to get arguments for call/invoke instructions. It breaks 2010-06-07 19:05:06 +00:00
AliasAnalysis.cpp Add an Intraprocedural form of BasicAliasAnalysis, which aims to 2010-06-29 00:50:39 +00:00
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp Generalize AAEval so that it can be used both per-function and 2010-06-28 16:01:37 +00:00
AliasDebugger.cpp Fix AliasDebugger to be aware of operand values too. 2010-05-28 22:31:51 +00:00
AliasSetTracker.cpp
Analysis.cpp
BasicAliasAnalysis.cpp Fix whitespace style. 2010-06-29 18:12:34 +00:00
CaptureTracking.cpp rename use_const_iterator to const_use_iterator for consistency's sake 2010-03-25 23:06:16 +00:00
CFGPrinter.cpp
CMakeLists.txt Move FindAvailableLoadedValue isSafeToLoadUnconditionally out of 2010-05-28 16:19:17 +00:00
ConstantFolding.cpp Eliminate unnecessary uses of getZExtValue(). 2010-06-18 14:22:04 +00:00
DbgInfoPrinter.cpp
DebugInfo.cpp Use named MDNode, llvm.dbg.sp, to collect subprogram info. This will be used to emit local variable's debug info of deleted functions. 2010-06-28 05:53:08 +00:00
DomPrinter.cpp Remove dead code in the dotty dominance tree printer. 2010-04-12 15:02:19 +00:00
InlineCost.cpp Pulled CodeMetrics out of InlineCost.h and made it a bit more general, so it can be reused from PartialSpecializationCost 2010-06-09 15:11:37 +00:00
InstCount.cpp
InstructionSimplify.cpp move some select simplifications out out instcombine into 2010-04-20 05:32:14 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp Remove the Expr member from IVUsers. Instead of remembering the expression, 2010-04-19 21:48:58 +00:00
LazyValueInfo.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp Fix the noalias checking so that it doesn't worry about 2010-06-01 20:51:40 +00:00
LiveValues.cpp rename use_const_iterator to const_use_iterator for consistency's sake 2010-03-25 23:06:16 +00:00
Loads.cpp Move FindAvailableLoadedValue isSafeToLoadUnconditionally out of 2010-05-28 16:19:17 +00:00
LoopDependenceAnalysis.cpp Define placement new wrappers for BumpPtrAllocator and 2010-03-18 18:49:47 +00:00
LoopInfo.cpp Fix a bunch of namespace polution. 2010-04-15 17:08:50 +00:00
LoopPass.cpp Ok, third time's the charm. No changes from last time except the CMake 2010-04-02 23:17:14 +00:00
Makefile
MemoryBuiltins.cpp minor enhancement to llvm::isFreeCall API: return CallInst; no functional change 2010-06-23 21:51:12 +00:00
MemoryDependenceAnalysis.cpp use the new isFreeCall API and ArgOperand accessors 2010-06-23 22:48:06 +00:00
ModuleDebugInfoPrinter.cpp Add a simple module-level debug info printer. It just sets up a 2010-05-07 16:22:32 +00:00
PHITransAddr.cpp
PointerTracking.cpp Rename isLoopGuardedByCond to isLoopEntryGuardedByCond, to emphasise 2010-04-11 19:27:13 +00:00
PostDominators.cpp Remove unneeded debug in PostDominator runOnFunction() 2010-04-12 15:32:55 +00:00
ProfileEstimatorPass.cpp rename pred_const_iterator to const_pred_iterator for consistency's sake 2010-03-25 23:25:28 +00:00
ProfileInfo.cpp Remove a pointless variable. 2010-06-29 11:39:45 +00:00
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp rename pred_const_iterator to const_pred_iterator for consistency's sake 2010-03-25 23:25:28 +00:00
ProfileVerifierPass.cpp rename pred_const_iterator to const_pred_iterator for consistency's sake 2010-03-25 23:25:28 +00:00
README.txt When checking whether the special handling for an addrec increment which 2010-04-26 21:46:36 +00:00
ScalarEvolution.cpp Just as its not safe to blindly transfer the nsw bit from an add 2010-06-29 01:41:41 +00:00
ScalarEvolutionAliasAnalysis.cpp Fix a typo in a comment. 2010-06-18 00:53:08 +00:00
ScalarEvolutionExpander.cpp Use A.append(...) instead of A.insert(A.end(), ...) when A is a 2010-06-21 19:47:52 +00:00
ScalarEvolutionNormalization.cpp Fix normalization and de-normalization of non-affine SCEVs. 2010-06-04 19:16:34 +00:00
SparsePropagation.cpp
Trace.cpp
ValueTracking.cpp use ArgOperand accessors 2010-06-23 23:38:07 +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))

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