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From: | West, Nathan |
Subject: | Re: [Discuss-gnuradio] What value is in in[noutput_items+1]? |
Date: | Mon, 1 May 2017 14:48:29 -0400 |
I was looking back over the Quadrature Demod code and I happened to
notice something unusual. The call to the Volk multiply conjugate
routine appears to use in[noutput_items+1] on the last calculation.
Here's the call:
volk_32fc_x2_multiply_conjugate_32fc(&tmp[0], &in[1], &in[0], noutput_items);
It obviously works correctly, and the buffer's bigger than
noutput_items so it doesn't seem to cause a memory access issue.
So my question is: when volk uses the memory at in[noutput_items+1]
what value is it using? Is it using a zeroed byte, something from a
history buffer, or whatever happened to be there?
Would anyone have any insight?
Thanks!
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