Hi Sumek,
Codec2 for embedded platforms is definitely in need of size
optimization by *removing unused code for your chosen modes,* and
speed optimization by *optimizing the floating-point calculation.*
I think you might be wasting your time by pursuing structure and
malloc() optimizations, though. Consider what happens when you
remove malloc and place a variable on the stack. Instead of
indexing through the heap pointer, you are indexing through the
stack pointer. You don't see the stack pointer in the C code, but
it's there. The instructions will probably be very similar,
especially on ARM, you can check this using the -S flag of the
compiler. When optimizing, /always/ use -S to look at the
instructions generated by the compiler, this will show when an
optimization is /really/ an optimization.
Similarly, removing a struct and using a local variable would
still index through the stack pointer.
The second problem with removing malloc() and structs is that it
makes it less likely that your work could be returned to David's
codec2 sources.
Thanks
Bruce
On Mon, Jun 11, 2018 at 1:00 AM, sumek.wi via Freetel-codec2
<freetel-codec2@lists.sourceforge.net
<mailto:freetel-codec2@lists.sourceforge.net>> wrote:
Hi,
The reduced I said is program size. Also, I removed malloc
and struct to make the program
as simple as possible for embedded systems, and it also
reduce the execute time by not
indexing pointer.
I used gcc on CodeLite, I don't know why it doesn't remove
unreferenced much. Probably
it is in debug mode.
Sumek.
------------------------------------------------------------------------
*From:* Danilo Beuche <danilo.beu...@gmx.net
<mailto:danilo.beu...@gmx.net>>
*Sent:* Monday, June 11, 2018 12:06:54 PM
*To:* freetel-codec2@lists.sourceforge.net
<mailto:freetel-codec2@lists.sourceforge.net>
*Subject:* Re: [Freetel-codec2] noob in voice coding asking
for help about Codec2 decoder.
Hi,
btw, using the gcc's -flto during compiling and linking does
a great job of removing unused data and functions. Basically
the gcc breaks up every file into individual linkable
elements (each global variable and functions becomes an
independent linkage element) and anything not referenced
anywhere simply disappears from the final binary. Of course
there is a lot more going on with -flto (LTO stands for link
time optimization) but one of the side effects of using LTO
is this removal of unreferenced elements from binary code.
Other compilers have similar "tricks".
Regards,
Danilo
On 11.06.2018 03:19, Bruce Perens wrote:
Hi Sumek,
I am curious about your memory saving strategy.
Specifically, why using the stack vs. malloc() would result
in a significant memory savings, and how removing structs
would result in a significant memory savings.
Perhaps you mean you are removing /unused /ones?
Or is there something about the Windows compiler I don't
understand?
Thanks
Bruce
On Sun, Jun 10, 2018 at 1:40 PM, David Rowe
<da...@rowetel.com <mailto:da...@rowetel.com>> wrote:
Hi Sumek,
Oh I have one question, do you know if we can reduce
the size of codebook especially lsp_cbjvm
Many of those tables aren't used, so just link in the
ones you need to support the Codec 2 modes you would
like to use.
Cheers,
David
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