llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-06 23:32:27 +00:00

History

Akira Hatanaka 268c0509a9 Fix a bug in which BranchProbabilityInfo wasn't setting branch weights of basic blocks inside loops correctly.

Previously, BranchProbabilityInfo::calcLoopBranchHeuristics would determine the weights of basic blocks inside loops even when it didn't have enough information to estimate the branch probabilities correctly. This patch fixes the function to exit early if it doesn't see any exit edges or back edges and let the later heuristics determine the weights.

This fixes PR18705 and <rdar://problem/15991090>.

Differential Revision: http://reviews.llvm.org/D3363



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206194 91177308-0d34-0410-b5e6-96231b3b80d8

2014-04-14 16:56:19 +00:00

IPA

Handle vlas during inline cost computation if they'll be turned

2014-04-07 13:36:21 +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

PR15967 Fix in basicaa for faulty returning no alias.

2014-03-26 21:30:19 +00:00

BlockFrequencyInfo.cpp

blockfreq: Rename BlockFrequencyImpl to BlockFrequencyInfoImpl

2014-04-11 23:20:58 +00:00

BranchProbabilityInfo.cpp

Fix a bug in which BranchProbabilityInfo wasn't setting branch weights of basic blocks inside loops correctly.

2014-04-14 16:56:19 +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

Simplify loop that worked around bugs in old GCC/Xcode.

2014-03-25 09:06:18 +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 ceil function whenever feasible

2014-03-24 04:36:06 +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

Delinearize: Extend informationin -analyze output

2014-04-09 07:53:49 +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

divide by the result of the gcd

2014-04-08 21:21:13 +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

Use TopTTI->getGEPCost from within getUserCost

2014-04-01 18:50:06 +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))

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