XSETFLOAT        2761 src/alloc.c          XSETFLOAT (val, float_free_list);
XSETFLOAT        2778 src/alloc.c          XSETFLOAT (val, &float_block->floats[float_block_index]);
XSETFLOAT        5796 src/alloc.c      XSETFLOAT (new, p);