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GNU built-in functions

These functions provide compatibility with GNU library header files. The functions are described in the GNU documentation. See http://gcc.gnu.org. See also --gnu_version=version.

Nonstandard functions

__builtin_alloca(), __builtin_bcmp(), __builtin_exit(), __builtin_gamma(),
__builtin_gammaf(), __builtin_gammal(), __builtin_index(),
__builtin__memcpy_chk(), __builtin__memmove_chk(), __builtin_mempcpy(),
__builtin__mempcpy_chk(), __builtin__memset_chk(), __builtin_object_size(),
__builtin_rindex(), __builtin__snprintf_chk(), __builtin__sprintf_chk(),
__builtin_stpcpy(), __builtin__stpcpy_chk(), __builtin_strcat_chk(),
__builtin__strcpy_chk(), __builtin_strcasecmp(), __builtin_strncasecmp(),
__builtin__strncat_chk(), __builtin__strncpy_chk(), __builtin__vsnprintf_chk(),
__builtin__vsprintf_chk().

C99 functions

__builtin_exit(), __builtin_acoshf(), __builtin_acoshl(), __builtin_acosh(),
__builtin_asinhf(), __builtin_asinhl(), __builtin_asinh(), __builtin_atanhf(),
__builtin_atanhl(), __builtin_atanh(), __builtin_cabsf(), __builtin_cabsl(),
__builtin_cabs(), __builtin_cacosf(), __builtin_cacoshf(), __builtin_cacoshl(),
__builtin_cacosh(), __builtin_cacosl(), __builtin_cacos(), __builtin_cargf(),
__builtin_cargl(), __builtin_carg(), __builtin_casinf(), __builtin_casinhf(),
__builtin_casinhl(), __builtin_casinh(), __builtin_casinl(), __builtin_casin(),
__builtin_catanf(), __builtin_catanhf(), __builtin_catanhl(),
__builtin_catanh(), __builtin_catanl(), __builtin_catan(), __builtin_cbrtf(),
__builtin_cbrtl(), __builtin_cbrt(), __builtin_ccosf(), __builtin_ccoshf(),
__builtin_ccoshl(), __builtin_ccosh(), __builtin_ccosl(), __builtin_ccos(),
__builtin_cexpf(), __builtin_cexpl(), __builtin_cexp(), __builtin_cimagf(),
__builtin_cimagl(), __builtin_cimag(), __builtin_clogf(), __builtin_clogl(),
__builtin_clog(), __builtin_conjf(), __builtin_conjl(), __builtin_conj(),
__builtin_copysignf(), __builtin_copysignl(), __builtin_copysign(),
__builtin_cpowf(), __builtin_cpowl(), __builtin_cpow(), __builtin_cprojf(),
__builtin_cprojl(), __builtin_cproj(), __builtin_crealf(), __builtin_creall(),
__builtin_creal(), __builtin_csinf(), __builtin_csinhf(), __builtin_csinhl(),
__builtin_csinh(), __builtin_csinl(), __builtin_csin(), __builtin_csqrtf(),
__builtin_csqrtl(), __builtin_csqrt(), __builtin_ctanf(), __builtin_ctanhf(),
__builtin_ctanhl(), __builtin_ctanh(), __builtin_ctanl(), __builtin_ctan(),
__builtin_erfcf(), __builtin_erfcl(), __builtin_erfc(), __builtin_erff(),
__builtin_erfl(), __builtin_erf(), __builtin_exp2f(), __builtin_exp2l(),
__builtin_exp2(), __builtin_expm1f(), __builtin_expm1l(), __builtin_expm1(),
__builtin_fdimf(), __builtin_fdiml(), __builtin_fdim(), __builtin_fmaf(),
__builtin_fmal(), __builtin_fmaxf(), __builtin_fmaxl(), __builtin_fmax(),
__builtin_fma(), __builtin_fminf(), __builtin_fminl(), __builtin_fmin(),
__builtin_hypotf(), __builtin_hypotl(), __builtin_hypot(), __builtin_ilogbf(),
__builtin_ilogbl(), __builtin_ilogb(), __builtin_imaxabs(), __builtin_isblank(),
__builtin_isfinite(), __builtin_isinf(), __builtin_isnan(), __builtin_isnanf(),
__builtin_isnanl(), __builtin_isnormal(), __builtin_iswblank(),
__builtin_lgammaf(), __builtin_lgammal(), __builtin_lgamma(), __builtin_llabs(),
__builtin_llrintf(), __builtin_llrintl(), __builtin_llrint(),
__builtin_llroundf(), __builtin_llroundl(), __builtin_llround(),
__builtin_log1pf(), __builtin_log1pl(), __builtin_log1p(), __builtin_log2f(),
__builtin_log2l(), __builtin_log2(), __builtin_logbf(), __builtin_logbl(),
__builtin_logb(), __builtin_lrintf(), __builtin_lrintl(), __builtin_lrint(),
__builtin_lroundf(), __builtin_lroundl(), __builtin_lround(),
__builtin_nearbyintf(), __builtin_nearbyintl(), __builtin_nearbyint(),
__builtin_nextafterf(), __builtin_nextafterl(), __builtin_nextafter(),
__builtin_nexttowardf(), __builtin_nexttowardl(), __builtin_nexttoward(),
__builtin_remainderf(), __builtin_remainderl(), __builtin_remainder(),
__builtin_remquof(), __builtin_remquol(), __builtin_remquo(), __builtin_rintf(),
__builtin_rintl(), __builtin_rint(), __builtin_roundf(), __builtin_roundl(),
__builtin_round(), __builtin_scalblnf(), __builtin_scalblnl(),
__builtin_scalbln(), __builtin_scalbnf(), __builtin_calbnl(),
__builtin_scalbn(), __builtin_signbit(), __builtin_signbitf(),
__builtin_signbitl(), __builtin_snprintf(), __builtin_tgammaf(),
__builtin_tgammal(), __builtin_tgamma(), __builtin_truncf(), __builtin_truncl(),
__builtin_trunc(), __builtin_vfscanf(), __builtin_vscanf(),
__builtin_vsnprintf(), __builtin_vsscanf().

C99 functions in the C90 reserved namespace

__builtin_acosf(), __builtin_acosl(), __builtin_asinf(), __builtin_asinl(),
__builtin_atan2f(), __builtin_atan2l(), __builtin_atanf(), __builtin_atanl(),
__builtin_ceilf(), __builtin_ceill(), __builtin_cosf(), __builtin_coshf(),
__builtin_coshl(), __builtin_cosl(), __builtin_expf(), __builtin_expl(),
__builtin_fabsf(), __builtin_fabsl(), __builtin_floorf(), __builtin_floorl(),
__builtin_fmodf(), __builtin_fmodl(), __builtin_frexpf(), __builtin_frexpl(),
__builtin_ldexpf(), __builtin_ldexpl(), __builtin_log10f(), __builtin_log10l(),
__builtin_logf(), __builtin_logl(), __builtin_modfl(), __builtin_modf(),
__builtin_powf(), __builtin_powl(), __builtin_sinf(), __builtin_sinhf(),
__builtin_sinhl(), __builtin_sinl(), __builtin_sqrtf(), sqrtl, __builtin_tanf(),
__builtin_tanhf(), __builtin_tanhl(), __builtin_tanl().

C94 functions

__builtin_swalnum(), __builtin_iswalpha(), __builtin_iswcntrl(),
__builtin_iswdigit(), __builtin_iswgraph(), __builtin_iswlower(),
__builtin_iswprint(), __builtin_iswpunct(), __builtin_iswspace(),
__builtin_iswupper(), __builtin_iswxdigit(), __builtin_towlower(),
__builtin_towupper().

C90 functions

__builtin_abort(), __builtin_abs(), __builtin_acos(), __builtin_asin(),
__builtin_atan2(), __builtin_atan(), __builtin_calloc(), __builtin_ceil(),
__builtin_cosh(), __builtin_cos(), __builtin_exit(), __builtin_exp(),
__builtin_fabs(), __builtin_floor(), __builtin_fmod(), __builtin_fprintf(),
__builtin_fputc(), __builtin_fputs(), __builtin_frexp(), __builtin_fscanf(),
__builtin_isalnum(), __builtin_isalpha(), __builtin_iscntrl(),
__builtin_isdigit(), __builtin_isgraph(), __builtin_islower(),
__builtin_isprint(), __builtin_ispunct(), __builtin_isspace(),
__builtin_isupper(), __builtin_isxdigit(), __builtin_tolower(),
__builtin_toupper(), __builtin_labs(), __builtin_ldexp(), __builtin_log10(),
__builtin_log(), __builtin_malloc(), __builtin_memchr(), __builtin_memcmp(),
__builtin_memcpy(), __builtin_memset(), __builtin_modf(), __builtin_pow(),
__builtin_printf(), __builtin_putchar(), __builtin_puts(), __builtin_scanf(),
__builtin_sinh(), __builtin_sin(), __builtin_snprintf(), __builtin_sprintf(),
__builtin_sqrt(), __builtin_sscanf(), __builtin_strcat(), __builtin_strchr(),
__builtin_strcmp(), __builtin_strcpy(), __builtin_strcspn(), 
__builtin_strlen(), __builtin_strncat(), __builtin_strncmp(),
__builtin_strncpy(), __builtin_strpbrk(), __builtin_strrchr(),
__builtin_strspn(), __builtin_strstr(), __builtin_tanh(), __builtin_tan(),
__builtin_va_copy(), __builtin_va_end(), __builtin_va_start(), 
__builtin_vfprintf(), __builtin_vprintf(), __builtin_vsprintf().

The __builtin_va_list type is also supported. It is equivalent to the va_list type declared in stdarg.h.

C99 floating-point functions

__builtin_huge_val(), __builtin_huge_valf(), __builtin_huge_vall(),
__builtin_inf(), __builtin_nan(), __builtin_nanf(), __builtin_nanl(),
__builtin_nans(), __builtin_nansf(), __builtin_nansl().

GNU atomic memory access functions

__sync_fetch_and_add(), __sync_fetch_and_sub(), __sync_fetch_and_or(),
__sync_fetch_and_and(), __sync_fetch_and_xor(), __sync_fetch_and_nand(),
__sync_add_and_fetch(), __sync_sub_and_fetch(), __sync_or_and_fetch(),
__sync_and_and_fetch(), __sync_xor_and_fetch(), __sync_nand_and_fetch(),
__sync_bool_compare_and_swap(), __sync_val_compare_and_swap(),
__sync_lock_test_and_set(), __sync_lock_release(), __sync_synchronize().

Other built-in functions

__builtin_clz(), __builtin_constant_p(), __builtin_ctz(), __builtin_ctzl(),
__builtin_ctzll(), __builtin_expect(), __builtin_ffs(), __builtin_ffsl(),
__builtin_ffsll(), __builtin_frame_address(), __builtin_prefetch(),
__builtin_return_address(), __builtin_popcount(), __builtin_signbit().
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