Re: jpeg-turbo 6.2 and ppc G3
On Sat, Jul 02, 2016 at 08:57:56AM +0200, Riccardo Mottola wrote:
> Hi,
>
> any of you still running G3 or anyway a non-altivec computer?
>
> I noticed that using GS applications (compiled from source, not debian
> packages) I am unable to open JPEG files, I get an Illegal instruction.
>
> (gdb) bt
> #0 0x0d243b68 in ?? () from /usr/lib/powerpc-linux-gnu/libjpeg.so.62
> #1 0x0d243b40 in ?? () from /usr/lib/powerpc-linux-gnu/libjpeg.so.62
> #2 0x0d23a3c4 in ?? () from /usr/lib/powerpc-linux-gnu/libjpeg.so.62
> #3 0x0d21c550 in ?? () from /usr/lib/powerpc-linux-gnu/libjpeg.so.62
> #4 0x0d2220a0 in ?? () from /usr/lib/powerpc-linux-gnu/libjpeg.so.62
> #5 0x0d21a6bc in jpeg_read_scanlines () from
> /usr/lib/powerpc-linux-gnu/libjpeg.so.62
> #6 0x0fbbae30 in -[NSBitmapImageRep(JPEGReading)
> _initBitmapFromJPEG:errorMessage:] (self=0x1040fe78, _cmd=<optimized out>,
> imageData=0x1028e678, errorMsg=0x0) at NSBitmapImageRep+JPEG.m:462
> #7 0x0fbb3cfc in +[NSBitmapImageRep imageRepsWithData:] (self=<optimized
> out>, _cmd=<optimized out>, imageData=0x1028e678)
> at NSBitmapImageRep.m:223
>
> The GS code is quite well tested on many platforms and hasn't chaged
> recently, so I want to be reassured that jpegturbo works also on PPC without
> altivec or anyway works.
I would think libjpeg-turbo-progs would have something small in it you
could test with.
> I what test program could I use? I noticed that e.g. Firefox (which works)
> is not linked against it.
You could try forcing altivec off in libjpegturbo by setting the environment:
export JSIMD_FORCENONE=1
If that helps, then something is wrong with the runtime detection code.
It appears it is supposed to detect if the CPU supports altivec at
runtime and only use it if it is there.
Could you ask gdb what the illegal instruction is?
--
Len Sorensen
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