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Fix out of memory bound issue of Memory.copy() #58
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The original implementation assumes the memory size >= max(src, dest) + ROUND_UP(len, 32), which is not always true (and result in unexpected revert). The new implement will use reverse copy so that no out-of-copy memory will be touched (and also simplified the mask so that out-of-copy memory is unchanged).
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The original implementation assumes the memory size >= max(src, dest) + ROUND_UP(len, 32), which is not always true (and result in unexpected revert).
The new implement will use reverse copy so that no out-of-copy memory will be touched (and also simplified the mask so that out-of-copy memory is unchanged).