[Ffmpeg-devel] Problem building ffmpeg on G3 PPC without altivec unit (original) (raw)

Aurelien Jacobs aurel
Mon Feb 27 01:34:59 CET 2006

On Sun, 26 Feb 2006 22:41:34 +0100 Diego Biurrun wrote:

On Sun, Feb 26, 2006 at 10:12:48PM +0000, Benjamin Larsson wrote: > Diego Biurrun wrote: > > >On Sun, Feb 26, 2006 at 08:17:56PM +0000, Benjamin Larsson wrote: > > > >>http://equinox.campus.luth.se/~banan/2006/02/25/build-gcc-3.4.log > >> > >> [...] > >> > > > >But configure says > > > > AltiVec enabled yes > > > >are you passing --enable-altivec or is autodetection failing? > > > Only, ./configure --enable-gpl.

Just read through configure, look at lines 866-888 and try to find out why it enables AltiVec. Maybe add

I don't think that autodetection fails. It only check if cpu is a powerpc, and if gcc is able to build altivec code. Both should be true even when running on a G3. So I guess that the altivec code as always been built on G3, and the current problem is not specific to G3 build.

What fails right now is compiling the following line : vector unsigned int v16ui = vec_sl(vec_splat_u16(1),vec_splat_u16(4)); I guess that only some gcc version are able to build this ? (That's really a wild guess, I know nothing about altivec) I tested here with gcc 3.3.5 and I can see the same problem.

With the attached patch, altivec support is disabled when gcc is not able to build this specific initialization (but I guess this could disable altivec on G4 with certain gcc versions).

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