Speex dev - Nov 2006 - Re: 5. Re: how to build libspeex_armce.lib ? (patrick andrieux)

Hi Dave,

I tried defining ARM5E_ASM  and  ARM4_AS, and you are right, it doesn't
compile,
But I can't say if the problem come from the Microsoft compiler, because if
it doesn't know
ARM assembly optimizations, who can know ?
We may need to include/install something else to use ARM5E_ASM or ARM4_ASM,
or maybe this part of speex's code is not finished.

I tried to compare both libspeex_armce.lib and hand-built FIXED_POINT build
as well.
I encoded 30sec and it tooks around 6sec with libspeex_armce.lib (1.1.16)
and around 4sec with 1.2beta1.


rgds,
Patrick


>Thanks Patrick. I have done this too. However, it was my impression that
>the libspeex_armce.lib was cross-compiled in GCC. Building in VS2005
>doesn't allow you to take advantage of the ARM assembly optimizations,
>since the Microsoft compiler doesn't know how to do that (try defining
>ARM5E_ASM or ARM4_ASM and you will see what I mean). At least back in
> the 1.1.16 days this seemed to make a big difference for me: the time
>taken during a decent sized encode() call was much greater with a
>hand-built FIXED_POINT build than it was with libspeex_armce.lib, but
>perhaps I was doing something else wrong. I haven't had a chance to see
>if that's still the case with 1.2beta1.
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patrick andrieux a ?crit :
> Hi Dave,
> 
> I tried defining ARM5E_ASM  and  ARM4_AS, and you are right, it
> doesn't compile, But I can't say if the problem come from the
> Microsoft compiler, because if it doesn't know ARM assembly
> optimizations, who can know ? We may need to include/install
> something else to use ARM5E_ASM or ARM4_ASM, or maybe this part of
> speex's code is not finished.
The assembly optimisations use the gcc inline assembly syntax, so they
won't compile with MS compilers.
> I tried to compare both libspeex_armce.lib and hand-built FIXED_POINT
> build as well. I encoded 30sec and it tooks around 6sec with
> libspeex_armce.lib (1.1.16) and around 4sec with 1.2beta1.
Not surprised. 1.2beta1 is much better than the old 1.1.6 (not 1.1.16).

	Jean-Marc
> 
> rgds, Patrick
> 
> 
> 
>> Thanks Patrick. I have done this too. However, it was my impression
>> that the libspeex_armce.lib was cross-compiled in GCC. Building in
>> VS2005 doesn't allow you to take advantage of the ARM assembly
>> optimizations, since the Microsoft compiler doesn't know how to do
>> that (try defining ARM5E_ASM or ARM4_ASM and you will see what I
>> mean). At least back in the 1.1.16 days this seemed to make a big
>> difference for me: the time taken during a decent sized encode()
>> call was much greater with a hand-built FIXED_POINT build than it
>> was with libspeex_armce.lib, but perhaps I was doing something else
>> wrong. I haven't had a chance to see if that's still the case
with
>> 1.2beta1.
> 
> 
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> 
> 
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