llvm-6502

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

History

Hal Finkel a7a02cb737 Use TopTTI->getGEPCost from within getUserCost The implementation of getUserCost had duplicated (and hard-coded) the default logic in getGEPCost. Instead, it is better to use getGEPCost directly, which limits the default logic to the implementation of one function, and allows targets to override the behavior. No functionality change intended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205346 91177308-0d34-0410-b5e6-96231b3b80d8		2014-04-01 18:50:06 +00:00
..
IPA	Consistent use of the noduplicate attribute.	2014-03-17 16:19:07 +00:00
AliasAnalysis.cpp	IR: add a second ordering operand to cmpxhg for failure	2014-03-11 10:48:52 +00:00
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp
BasicAliasAnalysis.cpp	PR15967 Fix in basicaa for faulty returning no alias.	2014-03-26 21:30:19 +00:00
BlockFrequencyInfo.cpp	blockfreq: Implement Pass::releaseMemory()	2014-03-25 18:01:38 +00:00
BranchProbabilityInfo.cpp
CaptureTracking.cpp
CFG.cpp	Simplify loop that worked around bugs in old GCC/Xcode.	2014-03-25 09:06:18 +00:00
CFGPrinter.cpp
CMakeLists.txt
CodeMetrics.cpp	Consistent use of the noduplicate attribute.	2014-03-17 16:19:07 +00:00
ConstantFolding.cpp	Allow constant folding of ceil function whenever feasible	2014-03-24 04:36:06 +00:00
CostModel.cpp
Delinearization.cpp
DependenceAnalysis.cpp
DominanceFrontier.cpp
DomPrinter.cpp
InstCount.cpp
InstructionSimplify.cpp
Interval.cpp
IntervalPartition.cpp
IVUsers.cpp	PR17473:	2014-03-12 21:31:05 +00:00
LazyCallGraph.cpp	[LCG] Ran clang-format over this too and it pointed out some fixes.	2014-03-10 02:14:14 +00:00
LazyValueInfo.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp
LLVMBuild.txt
Loads.cpp
LoopInfo.cpp	Consistent use of the noduplicate attribute.	2014-03-17 16:19:07 +00:00
LoopPass.cpp
Makefile
MemDepPrinter.cpp
MemoryBuiltins.cpp
MemoryDependenceAnalysis.cpp
ModuleDebugInfoPrinter.cpp	[C++11] Change DebugInfoFinder to use range-based loops	2014-03-18 09:41:07 +00:00
NoAliasAnalysis.cpp
PHITransAddr.cpp
PostDominators.cpp
PtrUseVisitor.cpp
README.txt
RegionInfo.cpp
RegionPass.cpp
RegionPrinter.cpp
ScalarEvolution.cpp	ScalarEvolution: Compute exit counts for loops with a power-of-2 step.	2014-03-25 16:25:12 +00:00
ScalarEvolutionAliasAnalysis.cpp
ScalarEvolutionExpander.cpp
ScalarEvolutionNormalization.cpp	Add stride normalization to SCEV Normalize/Denormalize transformation.	2014-03-18 17:34:03 +00:00
SparsePropagation.cpp
TargetTransformInfo.cpp	Use TopTTI->getGEPCost from within getUserCost	2014-04-01 18:50:06 +00:00
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))

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