float-to-short conversion

Sat, 16 Nov 2019 17:57:38 -0800

Is it possible that at some point the GR3.7 float-to-short convert (which uses Volk, it seems) got busted?
I'm seeing values that look like they have been inappropriately byte-swapped. 


The attached flow-graph produces an output file with the correct value 
of "7" interpreted as a Short, but when the same is run on
  a different (still X86) machine (The Atom X5 z8350), as on the Atomic 
PI SBC, the values are byte-swapped.



I've been pulling my hair out for *weeks* on this, and only this evening 
came to realize that somewhere, those "shorts" are getting
  byte-swapped, and it looks like *one* of the Volk kernels may be to 
blame.



I would fully-expect there to be "surprises" when exchanging data twixt 
ARM SBCs and any randomly-chosen X86, because some (not ALL)

  ARMs use a different byte-ordering, but this is between X86 systems.


And on my lappy, which is a core i7 m640, the attached flow-graph 
produces the correct results in the output file.



My lappy is running GR 3.7.13.4 while the packaged GR for Ubuntu 18.04 
(on the Atomic PI) is  3.7.11-10.







Attachment:
float_test.grc

Description: application/gnuradio-grc






















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