Some more experimentation, this time using 2019 Lux IR as a base (https://github.com/mratsim/laser/blob/master/laser/lux_compiler/core/lux_types.nim, https://github.com/mratsim/laser/blob/master/laser/lux_compiler/core/README.md, https://github.com/mratsim/laser/blob/master/laser/lux_compiler/core/challenges.md, https://github.com/mratsim/laser/blob/master/laser/lux_compiler/core/low_level_design_considerations.md )
proc mm(m1, m2: LuxTensor): LuxTensor {.luxtile.} =
var i = domain(64)
var j = domain(64)