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http://www.catonmat.net/blog/low-level-bit-hacks-you-absolutely-must-know/
Bit Hack #6. Turn off the rightmost 1-bit.
y = x & (x-1)
Bit Hack #7. Isolate the rightmost 1-bit.
y = x & (-x)
Bit Hack #8. Right propagate the rightmost 1-bit.
y = x | (x-1)
Bit Hack #9. Isolate the rightmost 0-bit.
y = ~x & (x+1)
Bit Hack #10. Turn on the rightmost 0-bit.
y = x | (x+1)
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原文地址：http://www.cnblogs.com/huashiyiqike/p/4337284.html
