On Tue, Aug 21, 2001 at 08:12:28PM +1000, Chanop Silpa-Anan wrote: > After trying to get some dv software running, I have noticed that a few > packages have mmx code in it, e.g. quicktime4linux, libdv, libjpeg-mmx. > I wonder if there is any policy/guide line for this? if I would like to > package mmx optimized binary. > > i386/i486 wouldn't run these codes unless people install mmx emulation. > Some packages can be conditionally compiled with / without mmx without > much of a headache, some cannot.
No. At least for libdv, this is not correct. libdv checks at runtime if MMX support is available and switches to the appropriate subroutines. There's a compile-time switch to choose between plain C code and some x86 assembler optimisations, but that's separate from the MMX issue. When packaging a binary that's linked with libdv, you don't have to take care about MMX stuff (unless other parts of the program come with their own MMX code, of course). Regards, Daniel.
