http://stackoverflow.com/questions/8637142/what-does-this-bit-manipulating-function-do
unsigned long ccNextPOT(unsigned long x){ x = x - 1; x = x | (x >> 1); x = x | (x >> 2); x = x | (x >> 4); x = x | (x >> 8); x = x | (x >>16); return x + 1;} | | | asked Dec 26 '11 at 15:45 | |
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| | The OR and SHIFT statements fills with ones all bits of x to the right of most significant bit (up to 32 bits). Together with the pre-decrement and post-increment statements, this computes (as the function name suggets) the next power-of-two number, equal or greater than the given number (if x is greater than 0 and less than 2^32) | | answered Dec 26 '11 at 16:54 | |
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| | This function rounds x up to the next highest power of 2. It's exactly the code in unsigned int v; // compute the next highest power of 2 of 32-bit vv--;v |= v >> 1;v |= v >> 2;v |= v >> 4;v |= v >> 8;v |= v >> 16;v++; | | | answered Jul 31 '13 at 13:45 | |
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