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

[Jean-Marc Valin]

patrick andrieux a écrit :
> 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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