BITS_BITLENGTH    691 gc.c           #define BITMAP_INDEX(p)  (NUM_IN_PAGE(p) / BITS_BITLENGTH )
BITS_BITLENGTH    692 gc.c           #define BITMAP_OFFSET(p) (NUM_IN_PAGE(p) & (BITS_BITLENGTH-1))
BITS_BITLENGTH   3423 gc.c           	    p = offset  + i * BITS_BITLENGTH;
BITS_BITLENGTH   5301 gc.c           		p = offset  + j * BITS_BITLENGTH;
BITS_BITLENGTH   5719 gc.c           		    p = offset  + j * BITS_BITLENGTH;