MAPSHIFT - Illumos

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#define TESTBIT(map, i) (((map)[(i) >> MAPSHIFT] & (1 << (i) % NBBW)))

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#define SETBIT(map, i) (((map)[(i) >> MAPSHIFT] |= (1 << (i) % NBBW)))

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#define CLEARBIT(map, i) (((map)[(i) >> MAPSHIFT] &= ~(1 << (i) % NBBW)))

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for (sp = &sip->si_swapslots[sip->si_hint >> MAPSHIFT],

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for (sp = &sip->si_swapslots[sip->si_hint >> MAPSHIFT],

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ep = &sip->si_swapslots[sip->si_hint >> MAPSHIFT];