llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-20 09:30:43 +00:00

History

Chris Lattner cb7f653422 two changes: 1) make AliasSet hold the list of call sites with an assertingvh so we get a violent explosion if the pointer dangles. 2) Fix AliasSetTracker::deleteValue to remove call sites with by-pointer comparisons instead of by-alias queries. Using findAliasSetForCallSite can cause alias sets to get merged when they shouldn't, and can also miss alias sets when the call is readonly. #2 fixes PR6889, which only repros with a .c file :( git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112452 91177308-0d34-0410-b5e6-96231b3b80d8		2010-08-29 18:42:23 +00:00
..
IPA	Now that PassInfo and Pass::ID have been separated, move the rest of the passes over to the new registration API.	2010-08-23 17:52:01 +00:00
AliasAnalysis.cpp
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp	two changes: 1) make AliasSet hold the list of call sites with an	2010-08-29 18:42:23 +00:00
Analysis.cpp
BasicAliasAnalysis.cpp
CaptureTracking.cpp
CFGPrinter.cpp	Now that PassInfo and Pass::ID have been separated, move the rest of the passes over to the new registration API.	2010-08-23 17:52:01 +00:00
CMakeLists.txt
ConstantFolding.cpp
DbgInfoPrinter.cpp
DebugInfo.cpp	Let FE use derived types for DW_TAG_friend.	2010-08-23 23:16:25 +00:00
DomPrinter.cpp
InlineCost.cpp
InstCount.cpp
InstructionSimplify.cpp
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	Make IVUsers iterative instead of recursive.	2010-08-29 16:40:03 +00:00
LazyValueInfo.cpp	Improve the precision of getConstant().	2010-08-27 23:29:38 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp
LiveValues.cpp
Loads.cpp
LoopDependenceAnalysis.cpp
LoopInfo.cpp
LoopPass.cpp
Makefile
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp
ModuleDebugInfoPrinter.cpp
PHITransAddr.cpp
PointerTracking.cpp
PostDominators.cpp
ProfileEstimatorPass.cpp	Now that PassInfo and Pass::ID have been separated, move the rest of the passes over to the new registration API.	2010-08-23 17:52:01 +00:00
ProfileInfo.cpp
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp	Now that PassInfo and Pass::ID have been separated, move the rest of the passes over to the new registration API.	2010-08-23 17:52:01 +00:00
ProfileVerifierPass.cpp
README.txt
RegionInfo.cpp
RegionPrinter.cpp
ScalarEvolution.cpp	Restructure the {A,+,B}<L> * {C,+,D}<L> folding so that it folds	2010-08-29 15:16:58 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp
ScalarEvolutionNormalization.cpp
SparsePropagation.cpp
Trace.cpp
TypeBasedAliasAnalysis.cpp
ValueTracking.cpp

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))

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