Boszormenyi Zoltan <zb(at)cybertec(dot)at> writes:
> Then, why isn't memcpy() skipped if the source and dest are the same?
> It would be a micro-optimization but a valid one.
No, it'd be more like a micro-pessimization, because the test would be
wasted effort in the vast majority of calls. The *only* reason to do
this would be to shut up valgrind, and that seems annoying.
I wonder if anyone's tried filing a bug against valgrind to say that it
shouldn't complain about this case.
regards, tom lane