Comment 43 for bug 727064
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0e1f616
(Get the code!)
FYI, this bug has bitten me in a different way: memcpy() copying backwards defeats the MADV_SEQUENTIAL flag to madvise(). A trivial file copier implementation (mmap source, mmap destination, set MADV_SEQUENTIAL, memcpy from source to destination) would perform much worse on machines that support SSSE3 than on machines that don't because of this bug.
(Before anyone tells me that I should copy files using read() and write(), my actual usage pattern was more complex, but the details are irrelevant.)