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Definition of "memory alignment" |
matching data to the physical characteristics of the computer memory. Computer memory is generally addressed in bytes, while memories handle data in units of 4, 8, or 16 bytes. If the “memory width” is 64 bits, then reading or writing an 8 byte (64 bit) quantity is more efficient if data words are aligned to the 64 bit words of the physical memory. Data that is not aligned may require more memory accesses and more-or-less complex masking and shifting, all of which slow the operations. Some computers insist that operands be properly aligned, often raising an exception or interrupt on unaligned addresses. Others allow unaligned data, but at the cost of lower performance. |
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