Comment 305 for bug 727064
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0e1f616
(Get the code!)
Perhaps because it is clearly documented?
ISO C99, 7.21.2.1:
"If copying takes place between objects that overlap, the behavior is undefined."
Ditto ISO C90, 7.11.2.1, Unix 98, POSIX 2003, POSIX 2008.
man 3 memcpy also clearly says
"The memory areas should not overlap. Use memmove(3) if the memory areas do overlap."
After all that is the only difference between memcpy and memmove.
glibc certainly doesn't guarantee bug compatibility, backward compatibility is only provided for correctly written programs that don't trigger undefined behavior. I'm not sure why you are rising RHEL here, the upcoming major version of RHEL will certainly provide the upstream memcpy version.