[FFmpeg-cvslog] r29011 - in trunk/libswscale: swscale.c swscale_internal.h swscale_template.c

[Reimar Döffinger]

On Mon, Mar 23, 2009 at 09:33:40AM +0100, Gwenole Beauchesne wrote:
> On Fri, 20 Mar 2009, Reimar D?ffinger wrote:
> > I have no idea and not much interest and would not exclude a compiler
> > bug, but it might well be a provision intended to allow combining 32 and
> > 64 bit code, preserving the PIC pointer in rbx for use as ebx by any 32
> > bit code.
> 
> This is not possible. On some ancient x86_64 implementation, it was 
> (unofficially) possible to mix both but the engineers later on discouraged 
> this as the actual implementation was to be changed. I am talking of the 
> implementation (processor), the specs clearly forbids this.

Forbid what? Certainly not switching between 64 bit and 32 bit code,
then you couldn't run 32 bit programs at all anymore...