As I understand, stream fusion is still subject of active research. A paper showing generalised stream fusion in Haskell was submitted to this year's ICFP.
There is also no benevolent dictator in charge of Haskell.
indeed. The generalized stream fusion work is about lifting pointwise operations to their SIMD vectorized analogue.
Likewise, stream fusion isn't always a win! Stream fusion and its siblings are great for pointwise operations, but aren't always a good idea for computations with heavy reuse, like nested convolutions or performant matrix multipy
Likewise, stream fusion isn't always a win! Stream fusion and its siblings are great for pointwise operations, but aren't always a good idea for computations with heavy reuse, like nested convolutions or performant matrix multipy