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* Iterate on vector rather than DenseMap during AffineMap normalizationNicolas Vasilache2019-03-291-8/+10
| | | | | | | This CL removes a flakyness associated to a spurious iteration on DenseMap iterators when normalizing AffineMap. PiperOrigin-RevId: 228160074
* Fix opt build failureNicolas Vasilache2019-03-291-0/+1
| | | | PiperOrigin-RevId: 227938032
* Complete TODOs / cleanup for loop-fusion utilityUday Bondhugula2019-03-292-39/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - this is CL 1/2 that does a clean up and gets rid of one limitation in an underlying method - as a result, fusion works for more cases. - fix bugs/incomplete impl. in toAffineMapFromEq - fusing across rank changing reshapes for example now just works For eg. given a rank 1 memref to rank 2 memref reshape (64 -> 8 x 8) like this, -loop-fusion -memref-dataflow-opt now completely fuses and inlines/store-forward to get rid of the temporary: INPUT // Rank 1 -> Rank 2 reshape for %i0 = 0 to 64 { %v = load %A[%i0] store %v, %B[%i0 floordiv 8, i0 mod 8] } for %i1 = 0 to 8 for %i2 = 0 to 8 %w = load %B[%i1, i2] "foo"(%w) : (f32) -> () OUTPUT $ mlir-opt -loop-fusion -memref-dataflow-opt fuse_reshape.mlir #map0 = (d0, d1) -> (d0 * 8 + d1) mlfunc @fuse_reshape(%arg0: memref<64xf32>) { for %i0 = 0 to 8 { for %i1 = 0 to 8 { %0 = affine_apply #map0(%i0, %i1) %1 = load %arg0[%0] : memref<64xf32> "foo"(%1) : (f32) -> () } } } AFAIK, there is no polyhedral tool / compiler that can perform such fusion - because it's not really standard loop fusion, but possible through a generalized slicing-based approach such as ours. PiperOrigin-RevId: 227918338
* [MLIR] Introduce normalized single-result unbounded AffineApplyOpNicolas Vasilache2019-03-293-5/+214
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Supervectorization does not plan on handling multi-result AffineMaps and non-canonical chains of > 1 AffineApplyOp. This CL introduces a simpler abstraction and composition of single-result unbounded AffineApplyOp by using the existing unbound AffineMap composition. This CL adds a simple API call and relevant tests: ```c++ OpPointer<AffineApplyOp> makeNormalizedAffineApply( FuncBuilder *b, Location loc, AffineMap map, ArrayRef<Value*> operands); ``` which creates a single-result unbounded AffineApplyOp. The operands of AffineApplyOp are not themselves results of AffineApplyOp by consrtuction. This represent the simplest possible interface to complement the composition of (mathematical) AffineMap, for the cases when we are interested in applying it to Value*. In this CL the composed AffineMap is not compressed (i.e. there exist operands that are not part of the result). A followup commit will compress to normal form. The single-result unbounded AffineApplyOp abstraction will be used in a followup CL to support the MaterializeVectors pass. PiperOrigin-RevId: 227879021
* [MLIR] Drop strict super-vector requirement in MaterializeVectorNicolas Vasilache2019-03-291-13/+5
| | | | | | | | | | | | | The strict requirement (i.e. at least 2 HW vectors in a super-vector) was a premature optimization to avoid interfering with other vector code potentially introduced via other means. This CL avoids this premature optimization and the spurious errors it causes when super-vector size == HW vector size (which is a possible corner case). This may be revisited in the future. PiperOrigin-RevId: 227763966
* [MLIR] Fix uninitialized value found with msanNicolas Vasilache2019-03-291-1/+3
| | | | | | | The omission of an early exit created opportunities for unitialized memory reads. This CL fixes the issue. PiperOrigin-RevId: 227761814
* Eliminate extfunc/cfgfunc/mlfunc as a concept, and just use 'func' instead.Chris Lattner2019-03-291-15/+2
| | | | | | | | | | | | | The entire compiler now looks at structural properties of the function (e.g. does it have one block, does it contain an if/for stmt, etc) so the only thing holding up this difference is round tripping through the parser/printer syntax. Removing this shrinks the compile by ~140LOC. This is step 31/n towards merging instructions and statements. The last step is updating the docs, which I will do as a separate patch in order to split it from this mostly mechanical patch. PiperOrigin-RevId: 227540453
* Simplify FunctionPass to only have a runOnFunction hook, instead of having aChris Lattner2019-03-291-9/+0
| | | | | | | | | | runOnCFG/MLFunction override locations. Passes that care can handle this filtering if they choose. Also, eliminate one needless difference between CFG/ML functions in the parser. This is step 30/n towards merging instructions and statements. PiperOrigin-RevId: 227515912
* Drop unusued HyperRectangularSet.h/.cpp, given the new design being worked on.Uday Bondhugula2019-03-291-199/+0
| | | | | | | | - drop these ununsed/incomplete sketches given the new design @albertcohen is working on, and given that FlatAffineConstraints is now stable and fast enough for all the analyses/transforms that depend on it. PiperOrigin-RevId: 227322739
* Introduce PostDominanceInfo, fix properlyDominates() for InstructionsUday Bondhugula2019-03-293-92/+82
| | | | | | | | | | | | | | | - introduce PostDominanceInfo in the right/complete way and use that for post dominance check in store-load forwarding - replace all uses of Analysis/Utils::dominates/properlyDominates with DominanceInfo::dominates/properlyDominates - drop all redundant copies of dominance methods in Analysis/Utils/ - in pipeline-data-transfer, replace dominates call with a much less expensive check; similarly, substitute dominates() in checkMemRefAccessDependence with a simpler check suitable for that context - fix a bug in properlyDominates - improve doc for 'for' instruction 'body' PiperOrigin-RevId: 227320507
* Fix dominates() for block's.Uday Bondhugula2019-03-291-12/+15
| | | | | | | | | - dominates() for blocks was assuming that there was only a single block at the top level whenever there was a hierarchy of blocks (as in the case of 'for'/'if' instructions). - fix the comments as well PiperOrigin-RevId: 227319738
* Greatly simplify the ConvertToCFG pass, converting it from a module pass to aChris Lattner2019-03-291-0/+4
| | | | | | | | | | | | | | function pass, and eliminating the need to copy over code and do interprocedural updates. While here, also improve it to make fewer empty blocks, and rename it to "LowerIfAndFor" since that is what it does. This is a net reduction of ~170 lines of code. As drive-bys, change the splitBlock method to *not* insert an unconditional branch, since that behavior is annoying for all clients. Also improve the AsmPrinter to not crash when a block is referenced that isn't linked into a function. PiperOrigin-RevId: 227308856
* Make PrintOpStatsPass a module passFeng Liu2019-03-291-10/+5
| | | | | | | PrintOpStatsPass is maintaining state (op stats ) across functions and doing per-module work - it should be a module pass. PiperOrigin-RevId: 227294151
* Introduce memref store to load forwarding - a simple memref dataflow analysisUday Bondhugula2019-03-293-19/+141
| | | | | | | | | | | | | | | | | - the load/store forwarding relies on memref dependence routines as well as SSA/dominance to identify the memref store instance uniquely supplying a value to a memref load, and replaces the result of that load with the value being stored. The memref is also deleted when possible if only stores remain. - add methods for post dominance for MLFunction blocks. - remove duplicated getLoopDepth/getNestingDepth - move getNestingDepth, getMemRefAccess, getNumCommonSurroundingLoops into Analysis/Utils (were earlier static) - add a helper method in FlatAffineConstraints - isRangeOneToOne. PiperOrigin-RevId: 227252907
* Fix b/122139732; update FlatAffineConstraints::isEmpty() to eliminate IDs in aUday Bondhugula2019-03-292-58/+72
| | | | | | | | | | | | | | better order. - update isEmpty() to eliminate IDs in a better order. Speed improvement for complex cases (for eg. high-d reshape's involving mod's/div's). - minor efficiency update to projectOut (was earlier making an extra albeit benign call to gaussianEliminateIds) (NFC). - move getBestIdToEliminate further up in the file (NFC). - add the failing test case. - add debug info to checkMemRefAccessDependence. PiperOrigin-RevId: 227244634
* Extend InstVisitor and Walker to handle arbitrary CFG functions, expand theChris Lattner2019-03-293-26/+10
| | | | | | | | | | | Function::walk functionality into f->walkInsts/Ops which allows visiting all instructions, not just ops. Eliminate Function::getBody() and Function::getReturn() helpers which crash in CFG functions, and were only kept around as a bridge. This is step 25/n towards merging instructions and statements. PiperOrigin-RevId: 227243966
* Merge the verifier logic for all functions into a unified framework, thisChris Lattner2019-03-294-243/+222
| | | | | | | | | | requires enhancing DominanceInfo to handle the structure of an ML function, which is required anyway. Along the way, this also fixes a const correctness problem with Instruction::getBlock(). This is step 24/n towards merging instructions and statements. PiperOrigin-RevId: 227228900
* Enhance parsing of CFG and Ext functions to optionally allow named arguments inChris Lattner2019-03-291-0/+5
| | | | | | | | | | | | | | | | | the function signature, giving them common functionality to ml functions. This is a strictly additive patch that adds new capability without changing behavior in a significant way (other than a few diagnostic cleanups). A subsequent patch will change the printer to use this behavior, which will require updating a ton of testcases. :) This exposes the fact that we need to make a grammar change for block arguments, as is tracked by b/122119779 This is step 23/n towards merging instructions and statements, and one of the first steps towards eliminating the "cfg vs ml" distinction at a syntax and semantic level. PiperOrigin-RevId: 227228342
* Tidy up references to "basic blocks" that should refer to blocks now. NFC.Chris Lattner2019-03-291-3/+3
| | | | PiperOrigin-RevId: 227196077
* Standardize naming of statements -> instructions, revisting the code base to beChris Lattner2019-03-2912-378/+381
| | | | | | | | | consistent and moving the using declarations over. Hopefully this is the last truly massive patch in this refactoring. This is step 21/n towards merging instructions and statements, NFC. PiperOrigin-RevId: 227178245
* Extend/complete dependence tester to utilize local var info.Uday Bondhugula2019-03-292-24/+66
| | | | | | | | | | | | | | | - extend/complete dependence tester to utilize local var info while adding access function equality constraints; one more step closer to get slicing based fusion working in the general case of affine_apply's involving mod's/div's. - update test case to reflect more accurate dependence information; remove inaccurate comment on test case mod_deps. - fix a minor "bug" in equality addition in addMemRefAccessConstraints (doesn't affect correctness, but the fixed version is more intuitive). - some more surrounding code clean up - move simplifyAffineExpr out of anonymous AffineExprFlattener class - the latter has state, and the former should reside outside. PiperOrigin-RevId: 227175600
* Rename BasicBlock and StmtBlock to Block, and make a pass cleaning it up. I ↵Chris Lattner2019-03-295-40/+40
| | | | | | | | | | | did not make an effort to rename all of the 'bb' names in the codebase, since they are still correct and any specific missed once can be fixed up on demand. The last major renaming is Statement -> Instruction, which is why Statement and Stmt still appears in various places. This is step 19/n towards merging instructions and statements, NFC. PiperOrigin-RevId: 227163082
* Eliminate the using decls for MLFunction and CFGFunction standardizing onChris Lattner2019-03-299-27/+27
| | | | | | | | Function. This is step 18/n towards merging instructions and statements, NFC. PiperOrigin-RevId: 227139399
* Rename BBArgument -> BlockArgument, Op::getOperation -> Op::getInst(),Chris Lattner2019-03-293-4/+4
| | | | | | | | StmtResult -> InstResult, StmtOperand -> InstOperand, and remove the old names. This is step 17/n towards merging instructions and statements, NFC. PiperOrigin-RevId: 227121537
* Merge Operation into OperationInst and standardize nomenclature aroundChris Lattner2019-03-2911-47/+47
| | | | | | | | OperationInst. This is a big mechanical patch. This is step 16/n towards merging instructions and statements, NFC. PiperOrigin-RevId: 227093712
* Fix affine expr flattener bug introduced by cl/225452174.Uday Bondhugula2019-03-291-11/+6
| | | | | | | - inconsistent local var constraint size when repeatedly using the same flattener for all expressions in a map. PiperOrigin-RevId: 227067836
* Merge CFGFuncBuilder/MLFuncBuilder/FuncBuilder together into a single newChris Lattner2019-03-291-2/+2
| | | | | | | | FuncBuilder class. Also rename SSAValue.cpp to Value.cpp This is step 12/n towards merging instructions and statements, NFC. PiperOrigin-RevId: 227067644
* Merge SSAValue, CFGValue, and MLValue together into a single Value class, whichChris Lattner2019-03-298-99/+87
| | | | | | | | | is the new base of the SSA value hierarchy. This CL also standardizes all the nomenclature and comments to use 'Value' where appropriate. This also eliminates a large number of cast<MLValue>(x)'s, which is very soothing. This is step 11/n towards merging instructions and statements, NFC. PiperOrigin-RevId: 227064624
* Eliminate the Instruction, BasicBlock, CFGFunction, MLFunction, and ↵Chris Lattner2019-03-294-14/+18
| | | | | | | | | | | | ExtFunction classes, using the Statement/StmtBlock hierarchy and Function instead. This *only* changes the internal data structures, it does not affect the user visible syntax or structure of MLIR code. Function gets new "isCFG()" sorts of predicates as a transitional measure. This patch is gross in a number of ways, largely in an effort to reduce the amount of mechanical churn in one go. It introduces a bunch of using decls to keep the old names alive for now, and a bunch of stuff needs to be renamed. This is step 10/n towards merging instructions and statements, NFC. PiperOrigin-RevId: 227044402
* LoopAnalysis: isContiguousAccess fail gracefullyAlex Zinenko2019-03-291-3/+6
| | | | | | | | | | | | | Existing implementation of isContiguousAccess asserts that one of the function arguments is within certain range, depending on another parameter. However, the value of this argument may come from outside, in particular in the loop vectorization pass it may come from command line arguments. This leads to 'mlir-opt' crashing on an assertion depending on flags. Handle the error gracefully by reporting error returning a negative result instead. This negative result prevents any further transformation by the vectorizer so the IR remains valid. PiperOrigin-RevId: 227029496
* Move print op stats pass to analysis.Jacques Pienaar2019-03-291-0/+126
| | | | | | | | Move PrintOpStatsPass out of tools and to other passes (moved to Analysis as it doesn't modify the program but it is different than the other analysis passes as it is only consumer at present is the user). PiperOrigin-RevId: 227018996
* Rename findFunction from the ML side of the house to be named getFunction(),Chris Lattner2019-03-291-1/+1
| | | | | | | | | | | | making it more similar to the CFG side of things. It is true that in a deeply nested case that this is not a guaranteed O(1) time operation, and that 'get' could lead compiler hackers to think this is cheap, but we need to merge these and we can look into solutions for this in the future if it becomes a problem in practice. This is step 9/n towards merging instructions and statements, NFC. PiperOrigin-RevId: 226983931
* Refactor MLFunction to contain a StmtBlock for its body instead of inheritingChris Lattner2019-03-291-5/+5
| | | | | | | | | | from it. This is necessary progress to squaring away the parent relationship that a StmtBlock has with its enclosing if/for/fn, and makes room for functions to have more than one block in the future. This also removes IfClause and ForStmtBody. This is step 5/n towards merging instructions and statements, NFC. PiperOrigin-RevId: 226936541
* Refactor ForStmt: having it contain a StmtBlock instead of subclassingChris Lattner2019-03-294-11/+12
| | | | | | | | | | | | | | StmtBlock. This is more consistent with IfStmt and also conceptually makes more sense - a forstmt "isn't" its body, it contains its body. This is step 1/N towards merging BasicBlock and StmtBlock. This is required because in the new regime StmtBlock will have a use list (just like BasicBlock does) of operands, and ForStmt already has a use list for its induction variable. This is a mechanical patch, NFC. PiperOrigin-RevId: 226684158
* Computation slice update: adds parameters to insertBackwardComputationSlice ↵MLIR Team2019-03-291-9/+34
| | | | | | | | which specify the source loop nest depth at which to perform iteration space slicing, and the destination loop nest depth at which to insert the compution slice. Updates LoopFusion pass to take these parameters as command line flags for experimentation. PiperOrigin-RevId: 226514297
* Do proper indexing for local variables when building access function ↵MLIR Team2019-03-291-10/+12
| | | | | | equality constraints (working on test cases). PiperOrigin-RevId: 226399089
* Pass loop depth 1 to memref dependence check when constructing dependence ↵MLIR Team2019-03-291-1/+1
| | | | | | | | constraints used to calculate computation slice for loop fusion. This done so that the dominance check between ancestors of op statements from src/dst memref accesses will be run. PiperOrigin-RevId: 226350443
* Address some issues from memref dependence check bug (b/121216762), adds ↵MLIR Team2019-03-291-15/+34
| | | | | | tests cases. PiperOrigin-RevId: 226277453
* Simplify memref-dependence-check's meta data structures / drop duplication andUday Bondhugula2019-03-293-149/+111
| | | | | | | | | | | | | | | | reuse existing ones. - drop IterationDomainContext, redundant since FlatAffineConstraints has MLValue information associated with its dimensions. - refactor to use existing support - leads to a reduction in LOC - as a result of these changes, non-constant loop bounds get naturally supported for dep analysis. - update test cases to include a couple with non-constant loop bounds - rename addBoundsFromForStmt -> addForStmtDomain - complete TODO for getLoopIVs (handle 'if' statements) PiperOrigin-RevId: 226082008
* Update / complete a TODO for addBoundsForForStmtUday Bondhugula2019-03-292-11/+28
| | | | | | | | | | - when adding constraints from a 'for' stmt into FlatAffineConstraints, correctly add bound operands of the 'for' stmt as a dimensional identifier or a symbolic identifier depending on whether the bound operand is a valid MLFunction symbol - update test case to exercise this. PiperOrigin-RevId: 225988511
* Refactor/update memref-dep-check's addMemRefAccessConstraints andUday Bondhugula2019-03-292-71/+82
| | | | | | | | | | | addDomainConstraints; add support for mod/div for dependence testing. - add support for mod/div expressions in dependence analysis - refactor addMemRefAccessConstraints to use getFlattenedAffineExprs (instead of getFlattenedAffineExpr); update addDomainConstraints. - rename AffineExprFlattener::cst -> localVarCst PiperOrigin-RevId: 225933306
* Refactor / eliminate duplicate code inUday Bondhugula2019-03-291-19/+5
| | | | | | memref-dep-check / getIterationDomainContext PiperOrigin-RevId: 225857762
* Type system: replace Type::getBitWidth with getIntOrFloatBitWidthAlex Zinenko2019-03-291-2/+14
| | | | | | | | | | | | | | | | | | | | | | | As MLIR moves towards dialect-specific types, a generic Type::getBitWidth does not make sense for all of them. Even with the current type system, the bit width is not defined (and causes the method in question to abort) for all TensorFlow types. This commit restricts the bit width definition to primitive standard types that have a number of bits appearing verbatim in their type, i.e., integers and floats. As a side effect, it delegates the decision on the bit width of the `index` to the backends. Existing backends currently hardcode it to 64 bits. The Type::getBitWidth method is replaced by Type::getIntOrFloatBitWidth that only applies to integers and floats. The call sites are updated to use the new method, where applicable, or rewritten so as not rely on it. Incidentally, this fixes a utility method that did not account for memrefs being allowed to have vectors as element types in the size computation. As an observation, several places in the code use Type in places where a more specific type could be used instead. Some of those are fixed by this commit. PiperOrigin-RevId: 225844792
* Loop Fusion pass update: introduce utilities to perform generalized loop ↵MLIR Team2019-03-294-12/+193
| | | | | | | | | | | | fusion based on slicing; encompasses standard loop fusion. *) Adds simple greedy fusion algorithm to drive experimentation. This algorithm greedily fuses loop nests with single-writer/single-reader memref dependences to improve locality. *) Adds support for fusing slices of a loop nest computation: fusing one loop nest into another by adjusting the source loop nest's iteration bounds (after it is fused into the destination loop nest). This is accomplished by solving for the source loop nest's IVs in terms of the destination loop nests IVs and symbols using the dependece polyhedron, then creating AffineMaps of these functions for the loop bounds of the fused source loop. *) Adds utility function 'insertMemRefComputationSlice' which computes and inserts computation slice from loop nest surrounding a source memref access into the loop nest surrounding the destingation memref access. *) Adds FlatAffineConstraints::toAffineMap function which returns and AffineMap which represents an equality contraint where one dimension identifier is represented as a function of all others in the equality constraint. *) Adds multiple fusion unit tests. PiperOrigin-RevId: 225842944
* Remove duplicate code / reuse right utilities from memref-dep-check / loop-tileUday Bondhugula2019-03-293-13/+12
| | | | | | | | | - use addBoundsForForStmt - getLoopIVs can return a vector of ForStmt * instead of const ForStmt *; the returned things aren't owned / part of the stmt on which it's being called. - other minor API cleanup PiperOrigin-RevId: 225774301
* 'memref-bound-check': extend to store op's as wellUday Bondhugula2019-03-292-44/+64
| | | | | | | | - extend memref-bound-check to store op's - make the bound check an analysis util and move to lib/Analysis/Utils.cpp (so that one doesn't need to always create a pass to use it) PiperOrigin-RevId: 225564830
* Extract vector_transfer_* Ops into a SuperVectorDialect.Alex Zinenko2019-03-292-1/+2
| | | | | | | | | | | From the beginning, vector_transfer_read and vector_transfer_write opreations were intended as a mid-level vectorization abstraction. In particular, they are lowered to the StandardOps dialect before further processing. As such, it does not make sense to keep them at the same level as StandardOps. Introduce the new SuperVectorOps dialect and move vector_transfer_* operations there. This will be used as a testbed for the generic lowering/legalization pass. PiperOrigin-RevId: 225554492
* Expression flattening improvement - reuse local expressions.Uday Bondhugula2019-03-292-143/+254
| | | | | | | | | | | | | | | - if a local id was already for a specific mod/div expression, just reuse it if the expression repeats (instead of adding a new one). - drastically reduces the number of local variables added during flattening for real use cases - since the same div's and mod expressions often repeat. - add getFlattenedAffineExprs for AffineMap, IntegerSet based on the above As a natural result of the above: - FlatAffineConstraints(IntegerSet) ctor now deals with integer sets that have mod and div constraints as well, and these get simplified as well from -simplify-affine-structures PiperOrigin-RevId: 225452174
* FlatAffineConstraints - complete TODOs: add method to remove duplicate /Uday Bondhugula2019-03-291-8/+107
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | trivially redundant constraints. Update projectOut to eliminate identifiers in a more efficient order. Fix b/120801118. - add method to remove duplicate / trivially redundant constraints from FlatAffineConstraints (use a hashing-based approach with DenseSet) - update projectOut to eliminate identifiers in a more efficient order (A sequence of affine_apply's like this (from a real use case) finally exposed the lack of the above trivial/low hanging simplifications). for %ii = 0 to 64 { for %jj = 0 to 9 { %a0 = affine_apply (d0, d1) -> (d0 * (9 * 1024) + d1 * 128) (%ii, %jj) %a1 = affine_apply (d0) -> (d0 floordiv (2 * 3 * 3 * 128 * 128), (d0 mod 294912) floordiv (3 * 3 * 128 * 128), (((d0 mod 294912) mod 147456) floordiv 1152) floordiv 8, (((d0 mod 294912) mod 147456) mod 1152) floordiv 384, ((((d0 mod 294912) mod 147456) mod 1152) mod 384) floordiv 128, (((((d0 mod 294912) mod 147456) mod 1152) mod 384) mod 128) floordiv 128) (%a0) %v0 = load %in[%a1tensorflow/mlir#0, %a1tensorflow/mlir#1, %a1tensorflow/mlir#3, %a1tensorflow/mlir#4, %a1tensorflow/mlir#2, %a1tensorflow/mlir#5] : memref<2x2x3x3x16x1xi32> } } - update FlatAffineConstraints::print to print number of constraints. PiperOrigin-RevId: 225397480
* Remove dead code from FlatAffineConstraintsUday Bondhugula2019-03-291-76/+0
| | | | | | | | | | | - getDimensionBounds() was added initially for quick experimentation - no longer used (getConstantBoundOnDimSize is the more powerful/complete replacement). - FlatAffineConstraints::getConstantLower/UpperBound are incomplete, functionality/naming-wise misleading, and not used currently. Removing these; complete/fixed version will be added in an upcoming CL. PiperOrigin-RevId: 225075061
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