llvm-mirror/lib/Analysis
2011-07-15 08:37:34 +00:00
..
IPA stop using WriteTypeSymbolic. 2011-07-09 18:02:13 +00:00
AliasAnalysis.cpp When analyzing functions known to only access argument pointees, 2011-04-27 18:39:03 +00:00
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp PR9604; try to deal with RAUW updates correctly in the AST. I'm not convinced 2011-04-09 06:55:46 +00:00
Analysis.cpp Introduce BlockFrequency analysis for BasicBlocks. 2011-06-23 21:45:20 +00:00
BasicAliasAnalysis.cpp Initialize BasicAA's AliasCache to set it to use fewer buckets by 2011-06-10 22:30:30 +00:00
BlockFrequency.cpp Missing files for the BlockFrequency analysis added. 2011-06-23 21:56:59 +00:00
BranchProbabilityInfo.cpp Calculate backedge probability correctly. 2011-06-23 23:52:11 +00:00
CaptureTracking.cpp Don't include Operator.h from InstrTypes.h. 2011-04-11 09:35:34 +00:00
CFGPrinter.cpp
CMakeLists.txt Introduce BlockFrequency analysis for BasicBlocks. 2011-06-23 21:45:20 +00:00
ConstantFolding.cpp Convert InsertValueInst and ExtractValueInst APIs to use ArrayRef. 2011-07-13 10:26:04 +00:00
DbgInfoPrinter.cpp
DebugInfo.cpp Simplify code. No functionality change. 2011-06-18 14:42:42 +00:00
DIBuilder.cpp Convert CallInst and InvokeInst APIs to use ArrayRef. 2011-07-15 08:37:34 +00:00
DominanceFrontier.cpp
DomPrinter.cpp
InlineCost.cpp Change condition for determining whether a function is small for inlining metrics so that very long functions 2011-05-24 20:22:24 +00:00
InstCount.cpp
InstructionSimplify.cpp Improve constant folding of undef for cmp and select operators. 2011-07-01 01:03:43 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp Teach IVUsers to stop at non-affine expressions unless they are both 2011-07-01 22:05:19 +00:00
LazyValueInfo.cpp llvm.memcpy.* has two distinct associated address spaces; the source address space, and the destination address space. Fix up the interface on MemIntrinsic and MemTransferInst to make this clear, and fix InstructionDereferencesPointer in LazyValueInfo.cpp to use the interface properly. 2011-05-31 20:40:16 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp Convert InsertValueInst and ExtractValueInst APIs to use ArrayRef. 2011-07-13 10:26:04 +00:00
Loads.cpp Test commit. 2011-06-03 17:15:37 +00:00
LoopDependenceAnalysis.cpp
LoopInfo.cpp
LoopPass.cpp Introduce DebugInfoProbe. This is used to monitor how llvm optimizer is treating debugging information. 2011-03-10 00:21:25 +00:00
Makefile
MemDepPrinter.cpp Add "unknown" results for memdep, which mean "I don't know whether a dependence for the given instruction exists in the given block". This cleans up all the existing hacks in memdep which represent this concept by returning clobber with various unrelated instructions. 2011-06-15 00:47:34 +00:00
MemoryBuiltins.cpp simplify some code. 2011-06-18 21:46:23 +00:00
MemoryDependenceAnalysis.cpp Add a limit to the number of instructions memdep will scan in a single block. This prevents (at least in some cases) O(N^2) runtime in passes like DSE. 2011-06-15 23:59:25 +00:00
ModuleDebugInfoPrinter.cpp
NoAliasAnalysis.cpp
PathNumbering.cpp Remove unused STL header includes. 2011-04-23 19:53:52 +00:00
PathProfileInfo.cpp
PathProfileVerifier.cpp Fix a ton of comment typos found by codespell. Patch by 2011-04-15 05:18:47 +00:00
PHITransAddr.cpp Don't include Operator.h from InstrTypes.h. 2011-04-11 09:35:34 +00:00
PostDominators.cpp remove postdom frontiers, because it is dead. Forward dom frontiers are 2011-04-05 21:57:17 +00:00
ProfileEstimatorPass.cpp Fix a ton of comment typos found by codespell. Patch by 2011-04-15 05:18:47 +00:00
ProfileInfo.cpp Fix a ton of comment typos found by codespell. Patch by 2011-04-15 05:18:47 +00:00
ProfileInfoLoader.cpp Remove unused STL header includes. 2011-04-23 19:53:52 +00:00
ProfileInfoLoaderPass.cpp
ProfileVerifierPass.cpp
README.txt
RegionInfo.cpp Region: Allow user control the printing style of the print function. 2011-04-04 07:19:18 +00:00
RegionPass.cpp Minor change: Fix the typo in RegionPass.h and RegionPass.cpp. 2011-05-05 13:59:38 +00:00
RegionPrinter.cpp RegionPrinter: Ignore back edges when layouting the graph 2011-02-27 04:11:07 +00:00
ScalarEvolution.cpp SCEV: missing null check fix for r132360, dragonegg crash. 2011-06-01 19:14:56 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp Preserve debug loc. 2011-07-05 21:48:22 +00:00
ScalarEvolutionNormalization.cpp Added SCEV::NoWrapFlags to manage unsigned, signed, and self wrap 2011-03-14 16:50:06 +00:00
SparsePropagation.cpp
Trace.cpp
TypeBasedAliasAnalysis.cpp Fix a ton of comment typos found by codespell. Patch by 2011-04-15 05:18:47 +00:00
ValueTracking.cpp Convert InsertValueInst and ExtractValueInst APIs to use ArrayRef. 2011-07-13 10:26:04 +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))

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