How to go from Simulink to embedded fixed-point DSP processor?

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A library of audio algorithms is modeled, tested and verified in Simulink. It needs to go from this existing Simulink models down to a multiple embedded platforms (both floating and fixed-point DSP processors: Qualcomm, Tensilica, ARM, etc).
Several workflows are considered:
1) Simulink diagram -> Matlab code -> generic C floating point -> C embedded platform 1
-> C embedded platform 2
-> C embedded platform 3
2) Simulink diagram -> generic C floating point -> C embedded platform 1
-> C embedded platform 2
-> C embedded platform 3
3) Simulink diagram -> C embedded platform 1
C embedded platform 2
C embedded platform 3
The Simulink models keep changing, so versioning and ease of maintenance should be considered.
Which workflow should be preferred?
Note: Simulink has a C code generation feature. It can generate both generic and embedded C code (with some of the required embedded platforms supported (ARM), and some not (Tensilica)). Not sure about the quality and usability of the C code, so should code generation be used or not is also an important question.

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