llvm/Analysis at 96c049d56dd54cd669f787435abddaf6d8e6717b - llvm

RPCS3/llvm

mirror of https://github.com/RPCS3/llvm.git synced 2024-12-29 07:53:33 +00:00

History

Juergen Ributzka d3cf783ed1 [Constant Hoisting] Make the constant materialization cost operand dependent Extend the target hook to take also the operand index into account when calculating the cost of the constant materialization. Related to <rdar://problem/16381500> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204435 91177308-0d34-0410-b5e6-96231b3b80d8		2014-03-21 06:04:45 +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	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
AliasAnalysisEvaluator.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
AliasDebugger.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
AliasSetTracker.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
Analysis.cpp	[cleanup] Re-sort all the includes with utils/sort_includes.py.	2014-03-04 10:07:28 +00:00
BasicAliasAnalysis.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
BlockFrequencyInfo.cpp	[Modules] Move CFG.h to the IR library as it defines graph traits over	2014-03-04 11:45:46 +00:00
BranchProbabilityInfo.cpp	[Modules] Move CFG.h to the IR library as it defines graph traits over	2014-03-04 11:45:46 +00:00
CaptureTracking.cpp	[C++11] Add range based accessors for the Use-Def chain of a Value.	2014-03-09 03:16:01 +00:00
CFG.cpp	Make succ_iterator a real random access iterator and clean up a couple of users.	2014-02-10 14:17:42 +00:00
CFGPrinter.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
CMakeLists.txt	[PM] Add a new "lazy" call graph analysis pass for the new pass manager.	2014-02-06 04:37:03 +00:00
CodeMetrics.cpp	Consistent use of the noduplicate attribute.	2014-03-17 16:19:07 +00:00
ConstantFolding.cpp	Allow constant folding of round function whenever feasible	2014-03-07 04:36:21 +00:00
CostModel.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
Delinearization.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
DependenceAnalysis.cpp	[Modules] Move InstIterator out of the Support library, where it had no	2014-03-04 10:30:26 +00:00
DominanceFrontier.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
DomPrinter.cpp	[PM] Split DominatorTree into a concrete analysis result object which	2014-01-13 13:07:17 +00:00
InstCount.cpp	[Layering] Move InstVisitor.h into the IR library as it is pretty	2014-03-06 03:23:41 +00:00
InstructionSimplify.cpp	[C++11] Add range based accessors for the Use-Def chain of a Value.	2014-03-09 03:16:01 +00:00
Interval.cpp	[Modules] Move CFG.h to the IR library as it defines graph traits over	2014-03-04 11:45:46 +00:00
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	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
Lint.cpp	Teach lint about address spaces	2014-03-06 17:33:55 +00:00
LLVMBuild.txt
Loads.cpp
LoopInfo.cpp	Consistent use of the noduplicate attribute.	2014-03-17 16:19:07 +00:00
LoopPass.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
Makefile
MemDepPrinter.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
MemoryBuiltins.cpp	[C++11] Add range based accessors for the Use-Def chain of a Value.	2014-03-09 03:16:01 +00:00
MemoryDependenceAnalysis.cpp	Replace OwningPtr<T> with std::unique_ptr<T>.	2014-03-06 05:51:42 +00:00
ModuleDebugInfoPrinter.cpp	[C++11] Change DebugInfoFinder to use range-based loops	2014-03-18 09:41:07 +00:00
NoAliasAnalysis.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
PHITransAddr.cpp	[C++11] Add range based accessors for the Use-Def chain of a Value.	2014-03-09 03:16:01 +00:00
PostDominators.cpp	[Modules] Move CFG.h to the IR library as it defines graph traits over	2014-03-04 11:45:46 +00:00
PtrUseVisitor.cpp	[C++11] Add range based accessors for the Use-Def chain of a Value.	2014-03-09 03:16:01 +00:00
README.txt
RegionInfo.cpp	[C++11] Add a basic block range view for RegionInfo	2014-03-03 13:00:39 +00:00
RegionPass.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
RegionPrinter.cpp	[C++11] Add a basic block range view for RegionInfo	2014-03-03 13:00:39 +00:00
ScalarEvolution.cpp	Remove some dead assignements found by scan-build	2014-03-15 22:13:15 +00:00
ScalarEvolutionAliasAnalysis.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
ScalarEvolutionExpander.cpp	[C++11] Add range based accessors for the Use-Def chain of a Value.	2014-03-09 03:16:01 +00:00
ScalarEvolutionNormalization.cpp	Add stride normalization to SCEV Normalize/Denormalize transformation.	2014-03-18 17:34:03 +00:00
SparsePropagation.cpp	[C++11] Add range based accessors for the Use-Def chain of a Value.	2014-03-09 03:16:01 +00:00
TargetTransformInfo.cpp	[Constant Hoisting] Make the constant materialization cost operand dependent	2014-03-21 06:04:45 +00:00
Trace.cpp	Put the functionality for printing a value to a raw_ostream as an	2014-01-09 02:29:41 +00:00
TypeBasedAliasAnalysis.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 07:30:04 +00:00
ValueTracking.cpp	[C++11] Add range based accessors for the Use-Def chain of a Value.	2014-03-09 03:16:01 +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.

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

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))

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