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Compiler-specific Features
__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().
4.10.3 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().
4.10.4 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().
4.10.5 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(),
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