DEF_LIB_BUILTIN (BUILT_IN_LDEXP, "ldexp", BT_FN_DOUBLE_DOUBLE_INT, ATTR_MATHFN_FPROUNDING_ERRNO)
DEF_C99_C90RES_BUILTIN (BUILT_IN_LDEXPF, "ldexpf", BT_FN_FLOAT_FLOAT_INT, ATTR_MATHFN_FPROUNDING_ERRNO)
DEF_C99_C90RES_BUILTIN (BUILT_IN_LDEXPL, "ldexpl", BT_FN_LONGDOUBLE_LONGDOUBLE_INT, ATTR_MATHFN_FPROUNDING_ERRNO)
+DEF_GCC_BUILTIN (BUILT_IN_LFLOOR, "lfloor", BT_FN_LONG_DOUBLE, ATTR_MATHFN_FPROUNDING)
+DEF_GCC_BUILTIN (BUILT_IN_LFLOORF, "lfloorf", BT_FN_LONG_FLOAT, ATTR_MATHFN_FPROUNDING)
+DEF_GCC_BUILTIN (BUILT_IN_LFLOORL, "lfloorl", BT_FN_LONG_LONGDOUBLE, ATTR_MATHFN_FPROUNDING)
DEF_C99_BUILTIN (BUILT_IN_LGAMMA, "lgamma", BT_FN_DOUBLE_DOUBLE, ATTR_MATHFN_FPROUNDING_ERRNO)
DEF_C99_BUILTIN (BUILT_IN_LGAMMAF, "lgammaf", BT_FN_FLOAT_FLOAT, ATTR_MATHFN_FPROUNDING_ERRNO)
DEF_C99_BUILTIN (BUILT_IN_LGAMMAL, "lgammal", BT_FN_LONGDOUBLE_LONGDOUBLE, ATTR_MATHFN_FPROUNDING_ERRNO)
+DEF_GCC_BUILTIN (BUILT_IN_LLFLOOR, "llfloor", BT_FN_LONGLONG_DOUBLE, ATTR_MATHFN_FPROUNDING)
+DEF_GCC_BUILTIN (BUILT_IN_LLFLOORF, "llfloorf", BT_FN_LONGLONG_FLOAT, ATTR_MATHFN_FPROUNDING)
+DEF_GCC_BUILTIN (BUILT_IN_LLFLOORL, "llfloorl", BT_FN_LONGLONG_LONGDOUBLE, ATTR_MATHFN_FPROUNDING)
DEF_C99_BUILTIN (BUILT_IN_LLRINT, "llrint", BT_FN_LONGLONG_DOUBLE, ATTR_MATHFN_FPROUNDING_ERRNO)
DEF_C99_BUILTIN (BUILT_IN_LLRINTF, "llrintf", BT_FN_LONGLONG_FLOAT, ATTR_MATHFN_FPROUNDING_ERRNO)
DEF_C99_BUILTIN (BUILT_IN_LLRINTL, "llrintl", BT_FN_LONGLONG_LONGDOUBLE, ATTR_MATHFN_FPROUNDING_ERRNO)