带有故意溢出的python 32位和64位整数数学 [英] python 32-bit and 64-bit integer math with intentional overflow

问题描述

在32位和64位进行整数数学运算的最佳方法是什么，以便像C语言一样发生溢出?

What's the best way to do integer math in 32- and 64-bit, so that overflow happens like it does in C?

例如(65536 * 65536 + 1)*(65536 * 65536 + 1)在64位数学运算中应为0x0000000200000001，而不是其确切值(非溢出)0x10000000200000001.

e.g. (65536*65536+1)*(65536*65536+1) should be 0x0000000200000001 in 64-bit math, and not its exact value (non-overflowing) 0x10000000200000001.

推荐答案

仅&使用适当的32位或64位掩码(0xffffffff或0xffffffffffffffff)的结果.

Just & the result with the appropriate 32- or 64-bit mask (0xffffffff or 0xffffffffffffffff).

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