[speex-dev] libspeex/SSE Intrinsics with GCC 3.3.x

[Jean-Marc Valin]

Actually, I prefer having the user explicitly specify --enable-sse
because you might want to compile for other machines than what you have.
Also, any idea what happens if the user already has CFLAGS=-O2 defined
(and you add -O3)? Last thing, how do you check whether gcc accepts
-msse?

        Jean-Marc

Le ven 02/04/2004 à 00:40, Aron Rosenberg a écrit :
> Here is code to add to configure.in to do what you want. It preserves 
> CFLAGS and uses that var to hold the sse enable flags. You can subset this 
> under the exisiting AC_ARG for sse or just make it do it all the time. If 
> you notice the i?86, that means any x86 platform target will have it 
> enabled. You can change that i686, but keep in mind that some distros 
> compile/target for i386 on the glibc / gcc compiles and you will sometimes 
> get i386 as the target even though you are on a pentium 3/4 box.
> 
> Aron Rosenberg
> SightSpeed
> 
> +++++ Add to configure.in ++++++++
> 
> echo -n "Checking for Platform ASM Speedups..."
> case "$target" in
>      i?86*)
>          CFLAGS="$CFLAGS -D_USE_SSE -O3 -msse"
>          echo "Found and Activating SSE"
>          ;;
>      powerpc-apple-darwin*)
>          CFLAGS="-faltivec"
>          echo "Found and Activating Altivec"
>          ;;
>      *)
>          echo "None Found"
>          ;;
> esac


-- 
Jean-Marc Valin
http://www.xiph.org/~jm/
LABORIUS
Université de Sherbrooke, Québec, Canada


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