llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-04 22:07:27 +00:00

History

Dan Gohman 32efba698d Change the argument to getIntegerSCEV to be an int64_t, rather than int. This will make it more convenient for LSR, which does a lot of things with int64_t offsets. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95281 91177308-0d34-0410-b5e6-96231b3b80d8		2010-02-04 02:43:51 +00:00
..
IPA	make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.	2010-01-24 20:43:08 +00:00
AliasAnalysis.cpp	Partially address a README by having functionattrs consider calls to	2010-01-06 08:45:52 +00:00
AliasAnalysisCounter.cpp	drop the pass name from the output.	2010-01-22 05:52:51 +00:00
AliasAnalysisEvaluator.cpp	Change dbgs() back to errs() as Chris requested.	2009-12-23 22:49:57 +00:00
AliasDebugger.cpp	adopt getAdjustedAnalysisPointer in a few more passes.	2010-01-20 20:09:02 +00:00
AliasSetTracker.cpp	Change dbgs() back to errs() as Chris requested.	2009-12-23 22:49:57 +00:00
Analysis.cpp	"In order to ease automatic bindings generation, it would be helpful if boolean values were distinguishable from integers. The attached patch introduces "typedef int LLVMBool;", and uses LLVMBool instead of int throughout the C API, wherever a boolean value is called for."	2010-01-09 22:27:07 +00:00
BasicAliasAnalysis.cpp	add some new methods to adjust this pointers. Not used yet.	2010-01-20 19:26:14 +00:00
CaptureTracking.cpp
CFGPrinter.cpp
CMakeLists.txt
ConstantFolding.cpp	Generalize target-independent folding rules for sizeof to handle more	2010-02-01 18:27:38 +00:00
DbgInfoPrinter.cpp	Remove dead debug info intrinsics.	2010-01-05 01:10:40 +00:00
DebugInfo.cpp	Provide interface to identifiy artificial methods.	2010-02-03 19:57:19 +00:00
DomPrinter.cpp	Create Generic DOTGraphTraits Printer/Viewer	2010-01-16 10:56:41 +00:00
InlineCost.cpp	Fix inline cost predictions with SCIENCE.	2010-01-26 23:21:56 +00:00
InstCount.cpp	Change dbgs() back to errs() as Chris requested.	2009-12-23 23:29:28 +00:00
InstructionSimplify.cpp
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	Add "dump" method to IVUsersOneStride.	2010-02-01 22:51:23 +00:00
LazyValueInfo.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
LiveValues.cpp
LoopDependenceAnalysis.cpp
LoopInfo.cpp	Restore dump() methods to Loop and MachineLoop.	2010-01-05 21:08:02 +00:00
LoopPass.cpp	eliminate a bunch more unneeded dynamic_cast's.	2010-01-22 05:37:10 +00:00
Makefile	make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.	2010-01-24 20:43:08 +00:00
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp
PHITransAddr.cpp	Change dbgs() back to errs() as Chris requested.	2009-12-23 23:27:15 +00:00
PointerTracking.cpp
PostDominators.cpp
ProfileEstimatorPass.cpp	adopt getAdjustedAnalysisPointer in a few more passes.	2010-01-20 20:09:02 +00:00
ProfileInfo.cpp	adopt getAdjustedAnalysisPointer in a few more passes.	2010-01-20 20:09:02 +00:00
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp	adopt getAdjustedAnalysisPointer in a few more passes.	2010-01-20 20:09:02 +00:00
ProfileVerifierPass.cpp
README.txt
ScalarEvolution.cpp	Change the argument to getIntegerSCEV to be an int64_t, rather	2010-02-04 02:43:51 +00:00
ScalarEvolutionAliasAnalysis.cpp	adopt getAdjustedAnalysisPointer in a few more passes.	2010-01-20 20:09:02 +00:00
ScalarEvolutionExpander.cpp	Generalize target-independent folding rules for sizeof to handle more	2010-02-01 18:27:38 +00:00
SparsePropagation.cpp
Trace.cpp	Convert debug messages to use dbgs(). Generally this means	2009-12-23 22:35:10 +00:00
ValueTracking.cpp	It looks like the changes to the SRem logic of SimplifyDemandedUseBits	2010-01-29 06:18:37 +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.

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