You are _NOT_ an idiot. There were serious bugs in the generic implementation of several of the type conversion kernels.
Best regards, Marcus On Sun, 2019-11-17 at 12:20 -0500, Marcus D Leech wrote: > Thanks Ron. > > I did some more testing, and it appears to indicate that I’m an > idiot. I won’t go into the sordid details. > > > > Sent from my iPhone > > > On Nov 17, 2019, at 6:17 AM, Ron Economos <w...@comcast.net> wrote: > > > > It's pretty easy to test for Volk issues. Just edit the > > ~/.volk/volk_config file and change the volk_32f_s32f_convert_16i > > line to generic for both alignments. > > > > On my older box, volk_config has u_avx for both alignments (and > > that works correctly). > > > > Ron > > > > > On 11/16/19 17:55, Marcus D. Leech wrote: > > > 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. > > > > > > > > >
smime.p7s
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