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History

Benjamin Kramer 58b98297ac Round 2 of dead private variable removal. LLVM is now -Wunused-private-field clean except for - lib/MC/MCDisassembler/Disassembler.h. Not sure why it keeps all those unaccessible fields. - gtest. llvm-svn: 158096		2012-06-06 19:47:08 +00:00
..
IPA	Handle intrinsics in GlobalsModRef. Fixes pr12351.	2012-03-28 21:31:24 +00:00
AliasAnalysis.cpp	Move the capture analysis from MemoryDependencyAnalysis to a more general place	2012-05-14 20:35:04 +00:00
AliasAnalysisCounter.cpp	Persuade GCC that there is nothing worth warning about here (there isn't).	2012-02-05 14:20:11 +00:00
AliasAnalysisEvaluator.cpp	Remove unnecessary default cases in switches that cover all enum values.	2012-01-10 16:47:17 +00:00
AliasDebugger.cpp
AliasSetTracker.cpp	Have AliasSet::aliasesUnknownInst use pointer TBAA info when available	2012-02-10 15:52:39 +00:00
Analysis.cpp
BasicAliasAnalysis.cpp	Duncan pointed out that if the alignment isn't explicitly specified, it defaults to the ABI alignment. Given that, make this code a bit more aggressive in such cases.	2012-02-27 23:16:46 +00:00
BlockFrequencyInfo.cpp
BranchProbabilityInfo.cpp
CaptureTracking.cpp	Fix intendation.	2012-05-10 23:38:07 +00:00
CFGPrinter.cpp
CMakeLists.txt	Pull the implementation of the code metrics out of the inline cost	2012-03-16 05:51:52 +00:00
CodeMetrics.cpp	A pile of long over-due refactorings here. There are some very, very	2012-05-04 00:58:03 +00:00
ConstantFolding.cpp	Reapply r155682, making constant folding more consistent, with a fix to work	2012-04-27 17:50:22 +00:00
DbgInfoPrinter.cpp
DebugInfo.cpp	Actually support DW_TAG_rvalue_reference_type that we were trying	2012-05-19 01:36:37 +00:00
DIBuilder.cpp	Add support for enum forward declarations.	2012-06-01 00:22:32 +00:00
DominanceFrontier.cpp
DomPrinter.cpp	remove the blank line from previous ci.	2012-02-04 03:18:47 +00:00
InlineCost.cpp	Fix typos found by http://github.com/lyda/misspell-check	2012-06-02 10:20:22 +00:00
InstCount.cpp
InstructionSimplify.cpp	Remove extraneous ';'.	2012-05-17 20:27:58 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	Cleanup IVUsers::addUsersIfInteresting.	2012-03-22 17:47:33 +00:00
LazyValueInfo.cpp	allow LazyValueInfo::getEdgeValue() to reason about multiple edges from the same switch instruction by doing union of ranges (which may still be conservative, but it's more aggressive than before)	2012-05-18 21:02:10 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp	Always compute all the bits in ComputeMaskedBits.	2012-04-04 12:51:34 +00:00
LLVMBuild.txt
Loads.cpp	enhance jump threading to preserve TBAA information when PRE'ing loads,	2012-03-13 18:07:41 +00:00
LoopDependenceAnalysis.cpp	More dead code removal (using -Wunreachable-code)	2012-01-20 21:51:11 +00:00
LoopInfo.cpp	Fix 12513: Loop unrolling breaks with indirect branches.	2012-04-10 05:14:42 +00:00
LoopPass.cpp	Take out the debug info probe stuff. It's making some changes to	2012-03-23 03:54:05 +00:00
Makefile
MemDepPrinter.cpp	Mark some static arrays as const.	2012-05-24 06:35:32 +00:00
MemoryBuiltins.cpp	remove calls to calloc if the allocated memory is not used (it was already being done for malloc)	2012-05-03 22:08:19 +00:00
MemoryDependenceAnalysis.cpp	Fix typos found by http://github.com/lyda/misspell-check	2012-06-02 10:20:22 +00:00
ModuleDebugInfoPrinter.cpp
NoAliasAnalysis.cpp
PathNumbering.cpp	[unwind removal] We no longer have 'unwind' instructions being generated, so	2012-02-06 21:16:41 +00:00
PathProfileInfo.cpp
PathProfileVerifier.cpp
PHITransAddr.cpp	Uniformize the InstructionSimplify interface by ensuring that all routines	2012-03-13 11:42:19 +00:00
PostDominators.cpp
ProfileEstimatorPass.cpp
ProfileInfo.cpp
ProfileInfoLoader.cpp	Round 2 of dead private variable removal.	2012-06-06 19:47:08 +00:00
ProfileInfoLoaderPass.cpp	Round 2 of dead private variable removal.	2012-06-06 19:47:08 +00:00
ProfileVerifierPass.cpp
README.txt
RegionInfo.cpp	Rename the Region::block_iterator to Region::block_node_iterator, and	2012-05-04 20:55:23 +00:00
RegionPass.cpp	Rename the Region::block_iterator to Region::block_node_iterator, and	2012-05-04 20:55:23 +00:00
RegionPrinter.cpp	Rename the Region::block_iterator to Region::block_node_iterator, and	2012-05-04 20:55:23 +00:00
ScalarEvolution.cpp	Fix typos found by http://github.com/lyda/misspell-check	2012-06-02 10:20:22 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	LSR fix: add a missing phi check during IV hoisting.	2012-05-22 17:39:59 +00:00
ScalarEvolutionNormalization.cpp	More dead code removal (using -Wunreachable-code)	2012-01-20 21:51:11 +00:00
SparsePropagation.cpp	Taken into account Duncan's comments for r149481 dated by 2nd Feb 2012:	2012-03-08 07:06:20 +00:00
Trace.cpp
TypeBasedAliasAnalysis.cpp
ValueTracking.cpp	Teach DeadStoreElimination to eliminate exit-block stores with phi addresses.	2012-05-10 18:57:38 +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))

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