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tvm
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Iterator quasi-affine mapping patterns. More...
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Classes | |
| class | tvm::arith::IterMapExprNode |
| Base class of all iter map expressions. More... | |
| class | tvm::arith::IterMapExpr |
| Managed reference to IterMapExprNode. More... | |
| class | tvm::arith::IterMarkNode |
| Mark the source as an iterator in [0, extent). More... | |
| class | tvm::arith::IterMark |
| Managed reference to IterMarkExprNode. More... | |
| class | tvm::arith::IterSplitExprNode |
| Split of an iterator. More... | |
| class | tvm::arith::IterSplitExpr |
| Managed reference to IterSplitExprNode. More... | |
| class | tvm::arith::IterSumExprNode |
| Fuse multiple iterators by summing them with scaling. More... | |
| class | tvm::arith::IterSumExpr |
| Managed reference to IterSumExprNode. More... | |
Namespaces | |
| tvm | |
| Performance counters for profiling via the PAPI library. | |
| tvm::arith | |
| namespace of arithmetic analysis. | |
Functions | |
| Array< IterSumExpr > | tvm::arith::DetectIterMap (const Array< PrimExpr > &indices, const Map< Var, Range > &input_iters, const PrimExpr &predicate, bool require_bijective, arith::Analyzer *analyzer) |
| Detect if indices can be written as [y_0 + c_0, y_1 + c_1, ..., y_n + c_n]. More... | |
| Array< PrimExpr > | tvm::arith::IterMapSimplify (const Array< PrimExpr > &indices, const Map< Var, Range > &input_iters, const PrimExpr &input_pred, bool require_bijective) |
| Use IterVarMap detector to rewrite and simplify the indices. More... | |
| Map< Var, PrimExpr > | tvm::arith::InverseAffineIterMap (const Array< IterSumExpr > &iter_map, const Array< PrimExpr > outputs) |
| Apply the inverse of the affine transformation to the outputs. More... | |
| Array< Array< IterMark > > | tvm::arith::SubspaceDivide (const Array< PrimExpr > &bindings, const Map< Var, Range > &input_iters, const Array< Var > &sub_iters, const PrimExpr &predicate, bool require_bijective, arith::Analyzer *analyzer) |
| Detect if bindings can be written as [a_0*e_0 + b_0 + c_0, a_1*e_1 + b_1, ..., a_n*e_n + b_n]. More... | |
Iterator quasi-affine mapping patterns.
This file defines a collection of mapping patterns maps a collection of independent iterators to another collection of independent iterators.
There are two main kinds of mapping patterns:
Fuse: fuse a collection of iterators into a single one
domain(x0) = [0, 4), domain(x1) = [0, 3), domain(x2) = [0, 2) fuse(x0, x1, x2): y = x2 * 12 + x1 * 4 + x0 domain(y) = [0, 24)
Split: split an iterator into multiple ones
domain(x) = [0, 24) split(x, 3, 12): [y0, y1, y2] = [x % 3, (x % 12) / 3, x / 12] domain(y0) = [0, 3), domain(y1) = [0, 4), domain(y2) = [0, 2)
We use the name "(quasi)affine" to be consistent with the terminology used in the polyhedral compilation. Notably, fuse is an affine transformation, while split corresponds to additional floordiv/mod operations that can appear in quasi-affine transformations.
1.8.13