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The Intel Advanced Matrix Extensions (AMX) provides a tile matrix multiply unit (TMUL), a tile control register (TILECFG), and eight tile registers TMM0 through TMM7 (TILEDATA). This new MLIR dialect provides a bridge between MLIR concepts like vectors and memrefs and the lower level LLVM IR details of AMX. Reviewed By: nicolasvasilache Differential Revision: https://reviews.llvm.org/D98470