[XviD-devel] Altivec Port Broken on OS X 10.4?

[Christoph Nägeli]

Hi all,

I recently upgraded to 10.4 and I think the Altivec Port is broken on  
Mac OS X 10.4 with gcc-4.0.
In addition to the fact, that gcc-4.0 does no more recognize -freduce- 
all-givs...
And one more: There are plenty of compiler warnings compiling the  
library.

switching to gcc-3.3, everything works as expected (though I'm no  
expert in compilers and I'm not
sure if it is a good idea to link to xvidcore compiled with gcc-3.3  
in an app build with gcc-4.0)

Can someone confirm?

For example:

===  test transfer ===
PLAINC - 8to16     10.177 usec       crc32=0x11281bf1 | ERROR
PLAINC - 16to8     -18.917 usec       crc32=0xee7ccbb4
PLAINC - 8to8      -6.091 usec       crc32=0xd37b3295
PLAINC - 16to8add  6.124 usec       crc32=0xdd817bf4
PLAINC - 8to16sub  8.655 usec       crc32(1)=0xbb460614 crc32(2) 
=0xd86c5d23 | ERROR1
PLAINC - 8to16sub2 19.119 usec       crc32=0xf67b1b57 | ERROR
---
ALTIVEC - 8to16     8.994 usec       crc32=0x7c911837 | ERROR
ALTIVEC - 16to8     -5.531 usec       crc32=0x7fcee9f9 | ERROR
ALTIVEC - 8to8      11.026 usec       crc32=0xb006f4d8 | ERROR
ALTIVEC - 16to8add  15.829 usec       crc32=0x24e0cfc9 | ERROR
ALTIVEC - 8to16sub  21.129 usec       crc32(1)=0xdc75ff6a crc32(2) 
=0xd86c5d23 | ERROR1

The error in the c-routine is caused through endianess.

--
Christoph