LDBL_MANT_BIT      32 gnulib-tests/float+.h # define LDBL_MANT_BIT LDBL_MANT_DIG
LDBL_MANT_BIT      36 gnulib-tests/float+.h # define LDBL_MANT_BIT (LDBL_MANT_DIG * 2)
LDBL_MANT_BIT      40 gnulib-tests/float+.h # define LDBL_MANT_BIT (LDBL_MANT_DIG * 4)