Background
==========

- Priority scale: High, Medium and Low

- Complexity scale: C1, C2, C4 and C8.  The complexity scale is exponential,
  with complexity 1 being the lowest complexity.  Complexity is a function
  of both task 'complexity' and task 'scope'.

  The general rule of thumb is that a complexity 1 task should take 1-2 weeks
  for a person very familiar with oFono codebase.  Higher complexity tasks
  require more time and have higher uncertainty.

  Higher complexity tasks should be refined into several lower complexity tasks
  once the task is better understood.

NEON instruction set
====================

- The neon optimization code is split in two parts. Sample reordering and blocks
encoding. There is a neon optimization for encoding SBC. But mSBC is not
supported by this optimizer because the reordering has been specifically for
mSBC.

  Priority: Low
  Complexity: C2

SSE instruction set
===================

- The decoder is optimized to take advantage of advanced processor instruction
sets. Currently implemented are MMX, arm neon, arm v6 and iwmmxt. SSE3 is
is available since almost 10 years now, on a large range of Intel processors.
It should be interesting to implement it and to compare with MMX implementation
on Intel processors.

  Priority: Medium
  Complexity: C4

Decoder improvements
====================

- Currently, only the decoder is optimized to take advantage of advanced
processor instruction sets. In use cases like HFP 1.6, optimizing the encoder
will bring a significant latency, power and performance advantage. For exemple,
the MMX encoder is 3 to 6 time faster than the SIMD encoder.

  Priority: High
  Complexity: C8