[PyPy-issue] [issue665] Efficient zeroing of heap locations

[David Edelsohn]

David Edelsohn <dje.gcc at gmail.com> added the comment:

For some of the Unladen benchmarks, we found long sequences of XOR/XCHG. 
Someone else mentioned that storing more zeros was safe.  If the address range
is not contiguous, then zeroing blocks of memory is not practical and the new
MOV sequences are a reasonable solution.

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