On Tue, 4 Sep 2001, Daniel Kobras wrote:
[assembly dumps]
> Comments?
Indeed, that's in the core (unpatched) glibc-2.2.4 sources:
glibc-2.2.4/sysdeps/i386/i586/memcpy.S
[...]
movl %eax, %ecx
subl $32, %ecx
js L(2)
/* Read ahead to make sure we write in the cache since the stupid
i586 designers haven't implemented read-on-write-miss. */
movl (%edi), %eax
L(3): movl 28(%edi), %edx
/* Now correct the loop counter. Please note that in the
following
code the flags are not changed anymore. */
subl $32, %ecx
[...]
Wow, the most outstanding thing is that this piece of code haven't changed
since: "Revision 1.1, Tue Nov 11 23:38:36 1997 UTC (3 years, 9 months ago)
by drepper"
For reference:
<http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/sysdeps/i386/i586/memcpy.S?cvsroot=glibc>
Thanks,
Gwenole
