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llvm-6502/test/Transforms
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Karthik Bhat 52610d84ad Add a new pass "Loop Interchange" 
This pass interchanges loops to provide a more cache-friendly memory access.

For e.g. given a loop like -
  for(int i=0;i<N;i++)
    for(int j=0;j<N;j++)
      A[j][i] = A[j][i]+B[j][i];

is interchanged to -
  for(int j=0;j<N;j++)
    for(int i=0;i<N;i++)
      A[j][i] = A[j][i]+B[j][i];

This pass is currently disabled by default.

To give a brief introduction it consists of 3 stages-

LoopInterchangeLegality : Checks the legality of loop interchange based on Dependency matrix.
LoopInterchangeProfitability: A very basic heuristic has been added to check for profitibility. This will evolve over time.
LoopInterchangeTransform : Which does the actual transform.

LNT Performance tests shows improvement in Polybench/linear-algebra/kernels/mvt and Polybench/linear-algebra/kernels/gemver becnmarks.

TODO:
1) Add support for reductions and lcssa phi.
2) Improve profitability model.
3) Improve loop selection algorithm to select best loop for interchange. Currently the innermost loop is selected for interchange.
4) Improve compile time regression found in llvm lnt due to this pass.
5) Fix issues in Dependency Analysis module.

A special thanks to Hal for reviewing this code.
Review: http://reviews.llvm.org/D7499




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231458 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-06 10:11:25 +00:00
..
ADCE [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
AddDiscriminators DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
AlignmentFromAssumptions [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
ArgumentPromotion DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
AtomicExpand/ARM
BBVectorize [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
BDCE [BDCE] Don't forget uses of root instructions seen before the instruction itself 2015-02-18 03:12:28 +00:00
BranchFolding
CodeExtractor [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
CodeGenPrepare [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
ConstantHoisting [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
ConstantMerge Make DataLayout Non-Optional in the Module 2015-03-04 18:43:29 +00:00
ConstProp [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
CorrelatedValuePropagation [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
DeadArgElim DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
DeadStoreElimination DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
EarlyCSE [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
FunctionAttrs [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
GCOVProfiling DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
GlobalDCE [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
GlobalOpt Make DataLayout Non-Optional in the Module 2015-03-04 18:43:29 +00:00
GVN [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
IndVarSimplify Make DataLayout Non-Optional in the Module 2015-03-04 18:43:29 +00:00
Inline Make DataLayout Non-Optional in the Module 2015-03-04 18:43:29 +00:00
InstCombine Teach ComputeNumSignBits about signed reminder. 2015-03-06 00:23:58 +00:00
InstMerge [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
InstSimplify [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
Internalize [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
IPConstantProp [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
IRCE [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
JumpThreading [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
LCSSA [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
LICM DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
LoadCombine [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
LoopDeletion [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
LoopIdiom DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
LoopInterchange Add a new pass "Loop Interchange" 2015-03-06 10:11:25 +00:00
LoopReroll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
LoopRotate DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
LoopSimplify Make DataLayout Non-Optional in the Module 2015-03-04 18:43:29 +00:00
LoopStrengthReduce Make DataLayout Non-Optional in the Module 2015-03-04 18:43:29 +00:00
LoopUnroll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
LoopUnswitch [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
LoopVectorize DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
LowerAtomic [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
LowerBitSets LowerBitSets: Use byte arrays instead of bit sets to represent in-memory bit sets. 2015-03-03 00:49:28 +00:00
LowerExpectIntrinsic [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
LowerInvoke
LowerSwitch [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
Mem2Reg DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
MemCpyOpt [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
MergeFunc [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
MetaRenamer [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
ObjCARC [objc-arc] Remove annotations code. 2015-03-06 00:34:29 +00:00
PartiallyInlineLibCalls
PhaseOrdering Make DataLayout Non-Optional in the Module 2015-03-04 18:43:29 +00:00
PlaceSafepoints PlaceSafepoints: use IRBuilder helpers 2015-02-26 00:35:56 +00:00
PruneEH Fix invalid LLVM IR in PruneEH tests 2015-02-11 02:06:47 +00:00
Reassociate [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
Reg2Mem
RewriteStatepointsForGC [RewriteStatepointsForGC] Yet more test cases for relocation 2015-03-05 22:28:06 +00:00
SampleProfile DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
Scalarizer Make DataLayout Non-Optional in the Module 2015-03-04 18:43:29 +00:00
ScalarRepl Make DataLayout Non-Optional in the Module 2015-03-04 18:43:29 +00:00
SCCP [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
SeparateConstOffsetFromGEP/NVPTX [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
SimplifyCFG DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
Sink [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
SLPVectorizer DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
SROA [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
StraightLineStrengthReduce Add straight-line strength reduction to LLVM 2015-02-03 19:37:06 +00:00
StripSymbols DebugInfo: Move new hierarchy into place 2015-03-03 17:24:31 +00:00
StructurizeCFG [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
TailCallElim TRE: Just erase dead BBs and tweak the iteration loop not to increment the deleted BB iterator. 2015-02-28 16:47:27 +00:00
TailDup
Util Correctly combine alias.scope metadata by a union instead of intersecting 2015-02-08 17:07:14 +00:00