Boszormenyi Zoltan <> 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

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