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https://issues.apache.org/jira/browse/STDCXX-722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Sebor updated STDCXX-722:
--------------------------------

    Attachment: stdcxx-722.log

Attached ChangeLog.

> [gcc] use math __builtins
> -------------------------
>
>                 Key: STDCXX-722
>                 URL: https://issues.apache.org/jira/browse/STDCXX-722
>             Project: C++ Standard Library
>          Issue Type: Sub-task
>          Components: 26. Numerics
>    Affects Versions: 4.2.0
>         Environment: gcc 4
>            Reporter: Martin Sebor
>            Assignee: Martin Sebor
>            Priority: Minor
>             Fix For: 4.2.1
>
>         Attachments: stdcxx-722.diff, stdcxx-722.log
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> For better efficiency and to reduce namespace pollution we can replace all 
> the math functions used in 
> [<complex>|http://svn.apache.org/repos/asf/stdcxx/trunk/include/complex] with 
> gcc's built-in  equivalents.
> Quoting from section [5.46 Other built-in functions provided by 
> GCC|http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Other-Builtins.html#Other-Builtins]
>  of the gcc online manual:
> {quote}
> The ISO C99 functions {{_Exit}}, {{acoshf}}, {{acoshl}}, {{acosh}}, 
> {{asinhf}}, {{asinhl}}, {{asinh}}, {{atanhf}}, {{atanhl}}, {{atanh}}, 
> {{cabsf}}, {{cabsl}}, {{cabs}}, {{cacosf}}, {{cacoshf}}, {{cacoshl}}, 
> {{cacosh}}, {{cacosl}}, {{cacos}}, {{cargf}}, {{cargl}}, {{carg}}, 
> {{casinf}}, {{casinhf}}, {{casinhl}}, {{casinh}}, {{casinl}}, {{casin}}, 
> {{catanf}}, {{catanhf}}, {{catanhl}}, {{catanh}}, {{catanl}}, {{catan}}, 
> {{cbrtf}}, {{cbrtl}}, {{cbrt}}, {{ccosf}}, {{ccoshf}}, {{ccoshl}}, {{ccosh}}, 
> {{ccosl}}, {{ccos}}, {{cexpf}}, {{cexpl}}, {{cexp}}, {{cimagf}}, {{cimagl}}, 
> {{cimag}}, {{clogf}}, {{clogl}}, {{clog}}, {{conjf}}, {{conjl}}, {{conj}}, 
> {{copysignf}}, {{copysignl}}, {{copysign}}, {{cpowf}}, {{cpowl}}, {{cpow}}, 
> {{cprojf}}, {{cprojl}}, {{cproj}}, {{crealf}}, {{creall}}, {{creal}}, 
> {{csinf}}, {{csinhf}}, {{csinhl}}, {{csinh}}, {{csinl}}, {{csin}}, 
> {{csqrtf}}, {{csqrtl}}, {{csqrt}}, {{ctanf}}, {{ctanhf}}, {{ctanhl}}, 
> {{ctanh}}, {{ctanl}}, {{ctan}}, {{erfcf}}, {{erfcl}}, {{erfc}}, {{erff}}, 
> {{erfl}}, {{erf}}, {{exp2f}}, {{exp2l}}, {{exp2}}, {{expm1f}}, {{expm1l}}, 
> {{expm1}}, {{fdimf}}, {{fdiml}}, {{fdim}}, {{fmaf}}, {{fmal}}, {{fmaxf}}, 
> {{fmaxl}}, {{fmax}}, {{fma}}, {{fminf}}, {{fminl}}, {{fmin}}, {{hypotf}}, 
> {{hypotl}}, {{hypot}}, {{ilogbf}}, {{ilogbl}}, {{ilogb}}, {{imaxabs}}, 
> {{isblank}}, {{iswblank}}, {{lgammaf}}, {{lgammal}}, {{lgamma}}, {{llabs}}, 
> {{llrintf}}, {{llrintl}}, {{llrint}}, {{llroundf}}, {{llroundl}}, 
> {{llround}}, {{log1pf}}, {{log1pl}}, {{log1p}}, {{log2f}}, {{log2l}}, 
> {{log2}}, {{logbf}}, {{logbl}}, {{logb}}, {{lrintf}}, {{lrintl}}, {{lrint}}, 
> {{lroundf}}, {{lroundl}}, {{lround}}, {{nearbyintf}}, {{nearbyintl}}, 
> {{nearbyint}}, {{nextafterf}}, {{nextafterl}}, {{nextafter}}, 
> {{nexttowardf}}, {{nexttowardl}}, {{nexttoward}}, {{remainderf}}, 
> {{remainderl}}, {{remainder}}, {{remquof}}, {{remquol}}, {{remquo}}, 
> {{rintf}}, {{rintl}}, {{rint}}, {{roundf}}, {{roundl}}, {{round}}, 
> {{scalblnf}}, {{scalblnl}}, {{scalbln}}, {{scalbnf}}, {{scalbnl}}, 
> {{scalbn}}, {{snprintf}}, {{tgammaf}}, {{tgammal}}, {{tgamma}}, {{truncf}}, 
> {{truncl}}, {{trunc}}, {{vfscanf}}, {{vscanf}}, {{vsnprintf}} and {{vsscanf}} 
> are handled as built-in functions except in strict ISO C90 mode ({{-ansi}} or 
> {{-std=c89}}).
> There are also built-in versions of the ISO C99 functions {{acosf}}, 
> {{acosl}}, {{asinf}}, {{asinl}}, {{atan2f}}, {{atan2l}}, {{atanf}}, 
> {{atanl}}, {{ceilf}}, {{ceill}}, {{cosf}}, {{coshf}}, {{coshl}}, {{cosl}}, 
> {{expf}}, {{expl}}, {{fabsf}}, {{fabsl}}, {{floorf}}, {{floorl}}, {{fmodf}}, 
> {{fmodl}}, {{frexpf}}, {{frexpl}}, {{ldexpf}}, {{ldexpl}}, {{log10f}}, 
> {{log10l}}, {{logf}}, {{logl}}, {{modfl}}, {{modf}}, {{powf}}, {{powl}}, 
> {{sinf}}, {{sinhf}}, {{sinhl}}, {{sinl}}, {{sqrtf}}, {{sqrtl}}, {{tanf}}, 
> {{tanhf}}, {{tanhl}} and {{tanl}} that are recognized in any mode since ISO 
> C90 reserves these names for the purpose to which ISO C99 puts them. All 
> these functions have corresponding versions prefixed with {{__builtin_}}.
> {quote}

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