llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-10-05 07:56:14 +00:00

History

Victor Hernandez 136526ce2d Invert isSafeToGetMallocArraySize check because we return NULL when we don't know the size. Thanks to Duncan Sands for noticing this bug. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84261 91177308-0d34-0410-b5e6-96231b3b80d8		2009-10-16 18:08:17 +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
AliasSetTracker.cpp
Analysis.cpp
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
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
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	Instead of testing whether an instruction dominates the loop preheader,	2009-09-27 15:30:00 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
LiveValues.cpp
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
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
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
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.

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