Function MinAlign

MathExtras.h:357–364

MinAlign - A and B are either alignments or offsets. Return the minimum alignment that may be assumed after adding the two together.

/// MinAlign - A and B are either alignments or offsets.  Return the minimum
/// alignment that may be assumed after adding the two together.
static inline uint64_t MinAlign(uint64_t A, uint64_t B) {
	// The largest power of 2 that divides both A and B.
	//
	// Replace "-Value" by "1+~Value" in the following commented code to avoid 
	// MSVC warning C4146
	//    return (A | B) & -(A | B);
	return (A | B) & (1 + ~(A | B));
}

/// NextPowerOf2 - Returns the next power of two (in 64-bits)
/// that is strictly greater than A.  Returns zero on overflow.