g++.dg/init/copy7.C makes sure that memcpy() is not emitted with src and dst equal.
The fix installed absolutely relies upon a backend implementing the movmem pattern, and essentially that such a pattern will always succeed to emit for arbitrary circumstances. However 1) not all platforms implement the pattern, it is not required, therefore it cannot be relied upon for correct code generation and 2) even those that implement this pattern have certain restrictions which could legitimately be triggered and thus cause the memcpy() with src and dst equal to still be emitted. Sparc is currently failing this testcase for reason #1, but it would be trivial to make minor modifications to the copy7.C test case to get it to fail on a score of several targets as well (even those that provide a movmem pattern). So we should either install a more complete fix or open the bug back up.
