llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-05 13:09:10 +00:00

History

Nuno Lopes d845c34170 simplify code from previous commits (Thanks Duncan) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158999 91177308-0d34-0410-b5e6-96231b3b80d8		2012-06-22 15:50:53 +00:00
..
IPA	refactor the MemoryBuiltin analysis:	2012-06-21 15:45:28 +00:00
AliasAnalysis.cpp
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp
BasicAliasAnalysis.cpp	refactor the MemoryBuiltin analysis:	2012-06-21 15:45:28 +00:00
BlockFrequencyInfo.cpp
BranchProbabilityInfo.cpp
CaptureTracking.cpp
CFGPrinter.cpp
CMakeLists.txt
CodeMetrics.cpp
ConstantFolding.cpp
DbgInfoPrinter.cpp
DebugInfo.cpp	Actually support DW_TAG_rvalue_reference_type that we were trying	2012-05-19 01:36:37 +00:00
DIBuilder.cpp	Add support for enum forward declarations.	2012-06-01 00:22:32 +00:00
DominanceFrontier.cpp
DomPrinter.cpp
InlineCost.cpp	Fix typos found by http://github.com/lyda/misspell-check	2012-06-02 10:20:22 +00:00
InstCount.cpp
InstructionSimplify.cpp	Remove extraneous ';'.	2012-05-17 20:27:58 +00:00
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp
LazyValueInfo.cpp	allow LazyValueInfo::getEdgeValue() to reason about multiple edges from the same switch instruction by doing union of ranges (which may still be conservative, but it's more aggressive than before)	2012-05-18 21:02:10 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp
LLVMBuild.txt
Loads.cpp
LoopDependenceAnalysis.cpp
LoopInfo.cpp	A new algorithm for computing LoopInfo. Temporarily disabled.	2012-06-20 05:23:33 +00:00
LoopPass.cpp
Makefile
MemDepPrinter.cpp	Mark some static arrays as const.	2012-05-24 06:35:32 +00:00
MemoryBuiltins.cpp	simplify code from previous commits (Thanks Duncan)	2012-06-22 15:50:53 +00:00
MemoryDependenceAnalysis.cpp	refactor the MemoryBuiltin analysis:	2012-06-21 15:45:28 +00:00
ModuleDebugInfoPrinter.cpp
NoAliasAnalysis.cpp
PathNumbering.cpp
PathProfileInfo.cpp
PathProfileVerifier.cpp
PHITransAddr.cpp
PostDominators.cpp
ProfileEstimatorPass.cpp
ProfileInfo.cpp
ProfileInfoLoader.cpp	Round 2 of dead private variable removal.	2012-06-06 19:47:08 +00:00
ProfileInfoLoaderPass.cpp	Round 2 of dead private variable removal.	2012-06-06 19:47:08 +00:00
ProfileVerifierPass.cpp
README.txt
RegionInfo.cpp
RegionPass.cpp
RegionPrinter.cpp
ScalarEvolution.cpp	Fix typos found by http://github.com/lyda/misspell-check	2012-06-02 10:20:22 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp	LSR fix: add a missing phi check during IV hoisting.	2012-05-22 17:39:59 +00:00
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))

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