That's the problem. If a set_output_multiple(4) in added to the
constructor in divide_cc_impl.cc, it solves the issue.
Ron
On 10/03/2018 06:42 AM, Ron Economos wrote:
Well, I guess it's not really a bug. Most likely it has to do with the
accuracy difference between the x86 intrinsics and the C library. If
you look at the code in volk_32fc_x2_divide_32fc.h, the remaining
points that are not a multiple of four are calculated with the C
library. If the points from one run that are calculated with the C
library line up with points calculated with intrinsics in the next
run, there can be a mismatch.
Ron
On 10/03/2018 06:27 AM, Ron Economos wrote:
It's a VOLK bug. Go into ~/.volk/volk_profile and change the
volk_32fc_x2_divide_32fc line to generic. That fixes the issue here.
Ron
On 10/03/2018 05:46 AM, Piotr Krysik wrote:
Hi all,
I simplified the flowgraph a bit and prepared a script that runs it
twice and compares the results.
https://imgur.com/a/CSjOeLc
In short something is wrong indeed.
Almost after every run of the script I get results with differences.
I tested it on GNU Radio 3.7.12.0, I'm compiling the most fresh
version
now.
Best Regards,
Piotr Krysik
W dniu 03.10.2018 o 06:55, Reiichiro Nakano pisze:
Here's an updated flowgraph where you don't need a separate file
source. Just run the flowgraph twice for a few seconds each. You'll
likely get different file sizes but `cmp` doesn't care, it'll still
show the first differing byte which should still prove the bug exists.
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