llvm-mirror

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History

Chris Lattner 4874f5bce5 teach libanalysis to simplify vector loads with bitcast sources. This implements something out of Target/README.txt producing: _foo: ## @foo movl 4(%esp), %eax movapd LCPI1_0, %xmm0 movapd %xmm0, (%eax) ret $4 instead of: _foo: ## @foo movl 4(%esp), %eax movapd _b, %xmm0 mulpd LCPI1_0, %xmm0 addpd _a, %xmm0 movapd %xmm0, (%eax) ret $4 llvm-svn: 84942		2009-10-23 06:57:37 +00:00
..
IPA	Remove MallocInst from LLVM Instructions.	2009-10-17 01:18:07 +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	inline isGEP away.	2009-10-17 23:48:54 +00:00
CaptureTracking.cpp	Push LLVMContexts through the IntegerType APIs.	2009-08-13 21:58:54 +00:00
CFGPrinter.cpp	make DOTGraphTraits public, patch by Tobias Grosser!	2009-10-18 04:09:11 +00:00
CMakeLists.txt	add function passes for printing various dominator datastructures	2009-10-18 04:10:40 +00:00
ConstantFolding.cpp	teach libanalysis to simplify vector loads with bitcast sources. This	2009-10-23 06:57:37 +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
DomPrinter.cpp	fix the other issue with ID's, hopefully really fixing the linux build.	2009-10-18 04:58:34 +00:00
InlineCost.cpp	Remove MallocInst from LLVM Instructions.	2009-10-17 01:18:07 +00:00
InstCount.cpp	Remove MallocInst from LLVM Instructions.	2009-10-17 01:18:07 +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	Fix another place that calls Loop::contains a lot to construct a sorted	2009-10-20 20:41:13 +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	Invert isSafeToGetMallocArraySize check because we return NULL when we don't know the size.	2009-10-16 18:08:17 +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	Remove MallocInst from LLVM Instructions.	2009-10-17 01:18:07 +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.

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