FLOAT_BLOCK      2577 src/alloc.c      GETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))
FLOAT_BLOCK      2580 src/alloc.c      SETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))
FLOAT_BLOCK      2583 src/alloc.c      UNSETMARKBIT (FLOAT_BLOCK (fptr), FLOAT_INDEX ((fptr)))