Inconsistencies in branch hop, file HighPerfCodeGen.md #4

Hello,

The first tiled MLIR example of the matrix multiplication (in section Tiling in MLIR)
seems inconsistent:

• the affine map names are not those used in the code
• the affine map parameters are not consistent with the tiling described above,
  or with the matrix sizes (2088x2048). I believe they should read:
  #map7 = (d0) -> (d064)
  #map8 = (d0) -> (2088,d064+64)

Comparing code and GFLOPS along the transformations of the tutorial has a
minor flaw - at first matrix A has size 2088x2048, but then it seems to change to
2048x2048 (in section Explicit Copying and Packing).

In any case, a hugely useful tutorial to me and my students - this is why I am
sending this erratum, so that it may help others.

If I had a wishlist of things that I missed:

• a good reference for unroll-and-jam
• a good reference on vectorization
• a TODO list explaining what has to be programmed into the hop
  branch of your fork of mlir to perform the tutorial.

Best regards,
Dumitru