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llvm/lib/Analysis
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Evan Cheng a846a8a1dc When checking aliases between phi sources and V2, we know the sources are not themselves phi nodes. However, V2 may be. Call aliasCheck with V2 first to potentially eliminate a std::swap call. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84226 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-16 00:33:09 +00:00
..
IPA Extend the StartPassTimer and StopPassTimer functions so that the 2009-09-28 00:07:05 +00:00
AliasAnalysis.cpp Global Aliases are not identifiable objects. 2009-08-27 17:52:56 +00:00
AliasAnalysisCounter.cpp Do not try to override non-virtual methods, especially 2009-09-06 20:02:00 +00:00
AliasAnalysisEvaluator.cpp Fix a missing newline, now that Value's operator<< doesn't add one of its own. 2009-08-26 14:34:12 +00:00
AliasDebugger.cpp Refactor my previous change to maintain the distinction between AliasAnalysis and BasicAliasAnalysis. This involves some wider changes because it 2009-02-05 23:36:27 +00:00
AliasSetTracker.cpp eliminate the std::ostream form of WriteAsOperand and update clients. 2009-08-23 05:17:37 +00:00
Analysis.cpp Tidy #includes. 2009-08-11 16:02:12 +00:00
BasicAliasAnalysis.cpp When checking aliases between phi sources and V2, we know the sources are not themselves phi nodes. However, V2 may be. Call aliasCheck with V2 first to potentially eliminate a std::swap call. 2009-10-16 00:33:09 +00:00
CaptureTracking.cpp Push LLVMContexts through the IntegerType APIs. 2009-08-13 21:58:54 +00:00
CFGPrinter.cpp The flag "--dot-cfg-only" is at the moment equivalent to the flag "--dot-cfg". 2009-09-19 11:25:44 +00:00
CMakeLists.txt Update the other CMake file. 2009-10-13 18:50:54 +00:00
ConstantFolding.cpp Extend ConstantFolding to understand signed overflow variants 2009-10-05 22:53:52 +00:00
DbgInfoPrinter.cpp Remove std::string uses from DebugInfo interface. 2009-09-29 18:40:58 +00:00
DebugInfo.cpp "there is not any instruction with attached debug info in this module" does not mean "there is no debug info in this module". :) 2009-10-13 17:35:35 +00:00
InlineCost.cpp Compute a full cost value even when a setjmp call is found. 2009-10-13 20:10:10 +00:00
InstCount.cpp Change Pass::print to take a raw ostream instead of std::ostream, 2009-08-23 06:03:38 +00:00
Interval.cpp Change Pass::print to take a raw ostream instead of std::ostream, 2009-08-23 06:03:38 +00:00
IntervalPartition.cpp Change Pass::print to take a raw ostream instead of std::ostream, 2009-08-23 06:03:38 +00:00
IVUsers.cpp Instead of testing whether an instruction dominates the loop preheader, 2009-09-27 15:30:00 +00:00
LibCallAliasAnalysis.cpp LibCallAliasAnalysis doesn't use TargetData. 2009-07-31 20:56:29 +00:00
LibCallSemantics.cpp Remove Value::getNameLen 2009-07-26 08:34:35 +00:00
LiveValues.cpp Delete an obsolete sentance from a comment. 2009-05-31 16:18:57 +00:00
LoopDependenceAnalysis.cpp remove a few dead insertion methods. 2009-08-24 02:39:26 +00:00
LoopInfo.cpp Move the dominator verification code out of special code embedded within 2009-09-28 00:27:48 +00:00
LoopPass.cpp Fix this debug output to handle the case where the loop has been deleted. 2009-09-28 15:40:01 +00:00
Makefile Removed trailing whitespace from Makefiles. 2009-01-09 16:44:42 +00:00
MallocHelper.cpp Fix bug where array malloc with unexpected computation of the size argument resulted in MallocHelper 2009-10-15 20:14:52 +00:00
MemoryDependenceAnalysis.cpp Memory dependence analysis was incorrectly stopping to scan for stores to a pointer at bitcast uses of a malloc call. 2009-10-13 01:42:53 +00:00
PointerTracking.cpp Fix bug where array malloc with unexpected computation of the size argument resulted in MallocHelper 2009-10-15 20:14:52 +00:00
PostDominators.cpp Change Pass::print to take a raw ostream instead of std::ostream, 2009-08-23 06:03:38 +00:00
ProfileEstimatorPass.cpp Make ProfileEstimator even more robust on general CFGs. 2009-09-11 08:39:33 +00:00
ProfileInfo.cpp Add the first functions for updating ProfileInfo. 2009-09-09 17:52:57 +00:00
ProfileInfoLoader.cpp Reapplied r81355 with the problems fixed. 2009-09-16 11:35:50 +00:00
ProfileInfoLoaderPass.cpp Reapplied r81355 with the problems fixed. 2009-09-16 11:35:50 +00:00
ProfileVerifierPass.cpp Bugfix. Sorry. 2009-09-11 08:43:15 +00:00
README.txt Create a README.txt for lib/Analysis, and add an entry. 2009-09-28 18:38:53 +00:00
ScalarEvolution.cpp Revert r83606 and add comments explaining why it isn't safe. 2009-10-09 16:35:06 +00:00
ScalarEvolutionAliasAnalysis.cpp Add some comments. 2009-08-29 23:36:57 +00:00
ScalarEvolutionExpander.cpp Introduce and use convenience methods for getting pointer types 2009-10-06 15:40:36 +00:00
SparsePropagation.cpp Add a comment explaining why you would ever want to do this. 2009-09-19 19:00:06 +00:00
Trace.cpp eliminate the "Value" printing methods that print to a std::ostream. 2009-08-23 04:37:46 +00:00
ValueTracking.cpp Handle sqrt in CannotBeNegativeZero. absf and absl 2009-09-25 20:54:50 +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.

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