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[mlir][Linalg] Add a useLinalgCopy option to Linalg bufferization.
Benchmarks show that memref::CopyOp is curently up to 200x slower than tiled and vectorized versions of linalg::Copy. Add a temporary flag to allow comprehensive bufferize to generate a linalg::GenericOp that implements a copy until this performance bug is resolved. Differential Revision: https://reviews.llvm.org/D117696
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Nicolas Vasilache
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Jan 19, 2022
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