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#define MASK(n) ((1 << (n)) - 1) /* make an n-bit mask */
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#define MASK64(n) ((CONST64U(1) << (n)) - 1) /* make an n-bit mask */
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#define DWORD_ALIGN(x) ((((x) + 3) >> 2) << 2)
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#define QWORD_ALIGN(x) ((((x) + 7) >> 3) << 3)