------- Comment #6 from falk at debian dot org 2009-03-17 12:10 ------- (In reply to comment #1) > calling memcpy with exactly overlapping operands is safe (obviously).
It's not safe at all. A memcpy implementation might use a "prefetch with write intent" instruction that allocates a cache line to a memory location without actually fetching it, such as wh64 on Alpha, which is actually being used by glibc. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39480
