On Tue, Jul 05, 2016 at 07:46:10PM +0200, Riccardo Mottola wrote:
> Hi Lennart,
>
> Lennart Sorensen wrote:
> >On Sat, Jul 02, 2016 at 08:57:56AM +0200, Riccardo Mottola wrote:
> >>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
>
> that works! Once set, the application loads several JPG files without
> issues.
So it turns out libjpeg-turbo has NO runtime detection on powerpc and
just assumes altivec is valid.
This untested patch might work:
--- simd/jsimd_powerpc.c.orig 2016-07-05 14:57:48.305763762 -0400
+++ simd/jsimd_powerpc.c 2016-07-05 14:58:04.453763762 -0400
@@ -32,7 +32,10 @@
if (simd_support != ~0U)
return;
- simd_support = JSIMD_ALTIVEC;
+ if (__builtin_cpu_supports("altivec"))
+ simd_support = JSIMD_ALTIVEC;
+ else
+ simd_support = 0;
/* Force different settings through environment variables */
env = getenv("JSIMD_FORCENONE");
--
Len Sorensen
