CLEAR_DOUBLE     2078 gc/include/private/gcconfig.h # ifndef CLEAR_DOUBLE
CLEAR_DOUBLE      110 gc/new_hblk.c  	CLEAR_DOUBLE(p+2);
CLEAR_DOUBLE      344 gc/reclaim.c   			CLEAR_DOUBLE(p);
CLEAR_DOUBLE      424 gc/reclaim.c   	    CLEAR_DOUBLE(p + start_displ + 2); \