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[Bug web/61054] Clearly note effect of memcpy optimization improvements in 4.9 changes


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61054

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
We already documented it, see "null pointer checks optimized away more
aggressively" at http://gcc.gnu.org/gcc-4.9/porting_to.html


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