[speex-dev] Speex 1.1.4 is out

[Aron Rosenberg]

A few things -

1. I think that run-time processor detection should not be included in Speex.

2. There a few ways of doing per-file compiling flags.
         a. Make a new static library that is just the files that have the 
SSE / Altivec code in them. You can then use target_CFLAGS in the 
Makefile.am script to set what you need

         b. Do tricks with file extensions. CFLAGS applies to files that 
have a .c ending. CXXFLAGS applies to files that have .cpp . If you place 
all the SSE intrinics into .cpp files, then you can add in 
libspeex\Makefile.am  a line like:  libspeex_la_CXXFLAGS = -march=pentium3. 
Even better, you can use the configure.in magic from our patch. You define 
the CXXFLAGS to add based upon the target architecture. (Note, you will 
need to add AC_PROG_CXX into configure.in). That way you add both #ifdef 
inside those files and you have runtime selection of the function to use.

ex (configure.in):
echo -n "Checking for Platform ASM Speedups..."
case "$target" in
     i?86*)
         CFLAGS="$CFLAGS -D_USE_SSE"
         CXXFLAGS="$CXXFLAGS -march=pentium3 -D_USE_SSE"
         echo "Found x86 - Adding SSE."
         ;;
     powerpc-apple-darwin*)
         CFLAGS="-D_USE_ALTIVEC"
         CXXFLAGS="$CXXFLAGS -faltivec -O3 -fPIC -D_USE_ALTIVEC"
         echo "Found Altivec"
         ;;
     *)
         echo "None Found"
         ;;
esac

<p>Since speex only uses .c files, 2b is a viable option.

Aron Rosenberg
SightSpeed

At 12:28 PM 1/21/2004, you wrote:
> >          Is it a problem if all the files are compiled with 
> -march=pentium3
> > ? The patch that we sent in already detects in the configure.in script
> > which system you are on and sets a define correctly, i.e. _USE_SSE.
>
>Well, if what you want is auto-detection, turning on -march=pentium3
>means that the code will crash on anything lower than a pentium3. Not
>really useful. Of course, you can make it auto-detect at compile-time,
>but that means you can't use the same binary on SSE and non-SSE
>machines.
>
>         Jean-Marc
>
>--
>Jean-Marc Valin, M.Sc.A., ing. jr.
>LABORIUS (http://www.gel.usherb.ca/laborius)
>Université de Sherbrooke, Québec, Canada

<p>--- >8 ----
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