我想知道使用SIMD指令是否可以加快我的一些代码。我加载了RcppNT2包，他们建议使用“precompileRcppNT2（）”函数来加速编译过程。在这样做时，我得到以下错误，并想知道是否有一些我错过的尝试使用该包：
R version 3.3.2 (2016-10-31) -- "Sincere Pumpkin Patch"
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The following object is masked from package:base:
setwd
libraries: c:/R/r_libs-3.3.2 C:/R/R-3.3.2/library
library & Java environment set from C:\Users\jh52822\Documents\.RProfile
> library(devtools)
> library(Rcpp)
> library(RcppNT2)
> sessionInfo()
R version 3.3.2 (2016-10-31)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] RcppNT2_0.1.0 Rcpp_0.12.7 devtools_1.12.0
loaded via a namespace (and not attached):
[1] withr_1.0.2 memoise_1.0.0 digest_0.6.10
> precompileRcppNT2()
Pre-compiling 'RcppNT2.h'...
In file included from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/include/functions/j0.hpp:5:0,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions.hpp:5,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/bessel.hpp:5,
from c:/R/r_libs-3.3.2/RcppNT2/include/RcppNT2.h:15:
c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions/scalar/j0.hpp: In member function 'nt2::ext::impl_j0_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<Origin> >), boost::dispatch::tag::cpu_>::result_type nt2::ext::impl_j0_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<Origin> >), boost::dispatch::tag::cpu_>::operator()(const A0&) const':
c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions/scalar/j0.hpp:60:14: error: '::_j0' has not been declared
return ::_j0(a0);
^
In file included from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/include/functions/j1.hpp:5:0,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions.hpp:6,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/bessel.hpp:5,
from c:/R/r_libs-3.3.2/RcppNT2/include/RcppNT2.h:15:
c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions/scalar/j1.hpp: In member function 'nt2::ext::impl_j1_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<Origin> >), boost::dispatch::tag::cpu_>::result_type nt2::ext::impl_j1_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<Origin> >), boost::dispatch::tag::cpu_>::operator()(const A0&) const':
c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions/scalar/j1.hpp:74:14: error: '::_j1' has not been declared
return ::_j1(a0);
^
In file included from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/include/functions/jni.hpp:5:0,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions.hpp:7,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/bessel.hpp:5,
from c:/R/r_libs-3.3.2/RcppNT2/include/RcppNT2.h:15:
c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions/scalar/jni.hpp: In member function 'nt2::ext::impl_jni_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::integer_<T> >, boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<A1> >), boost::dispatch::tag::cpu_>::result_type nt2::ext::impl_jni_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::integer_<T> >, boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<A1> >), boost::dispatch::tag::cpu_>::operator()(const A0&, const A1&) const':
c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions/scalar/jni.hpp:63:14: error: '::_jn' has not been declared
return ::_jn(a0, a1);
^
In file included from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/include/functions/y0.hpp:5:0,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions.hpp:8,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/bessel.hpp:5,
from c:/R/r_libs-3.3.2/RcppNT2/include/RcppNT2.h:15:
c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions/scalar/y0.hpp: In member function 'nt2::ext::impl_y0_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<Origin> >), boost::dispatch::tag::cpu_>::result_type nt2::ext::impl_y0_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<Origin> >), boost::dispatch::tag::cpu_>::operator()(const A0&) const':
c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions/scalar/y0.hpp:69:14: error: '::_y0' has not been declared
return ::_y0(a0);
^
In file included from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/include/functions/yni.hpp:5:0,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions.hpp:10,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/bessel.hpp:5,
from c:/R/r_libs-3.3.2/RcppNT2/include/RcppNT2.h:15:
c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions/scalar/yni.hpp: In member function 'nt2::ext::impl_yni_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::integer_<T> >, boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<A1> >), boost::dispatch::tag::cpu_>::result_type nt2::ext::impl_yni_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::integer_<T> >, boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<A1> >), boost::dispatch::tag::cpu_>::operator()(const A0&, const A1&) const':
c:/R/r_libs-3.3.2/RcppNT2/include/nt2/bessel/functions/scalar/yni.hpp:69:14: error: '::_yn' has not been declared
return ::_yn(a0, a1);
^
In file included from c:/R/r_libs-3.3.2/RcppNT2/include/boost/simd/ieee/include/functions/scalar/nextafter.hpp:5:0,
from c:/R/r_libs-3.3.2/RcppNT2/include/boost/simd/include/functions/scalar/nextafter.hpp:4,
from c:/R/r_libs-3.3.2/RcppNT2/include/boost/simd/ieee/functions/scalar/next.hpp:15,
from c:/R/r_libs-3.3.2/RcppNT2/include/boost/simd/ieee/include/functions/next.hpp:5,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/ieee/functions/next.hpp:12,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/ieee/include/functions/next.hpp:4,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/ieee/functions.hpp:27,
from c:/R/r_libs-3.3.2/RcppNT2/include/nt2/ieee/ieee.hpp:5,
from c:/R/r_libs-3.3.2/RcppNT2/include/RcppNT2.h:26:
c:/R/r_libs-3.3.2/RcppNT2/include/boost/simd/ieee/functions/scalar/nextafter.hpp: In member function 'boost::simd::ext::impl_nextafter_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<Origin> >, boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<Origin> >), boost::dispatch::tag::cpu_>::result_type boost::simd::ext::impl_nextafter_<void(boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<Origin> >, boost::dispatch::meta::scalar_<boost::dispatch::meta::double_<Origin> >), boost::dispatch::tag::cpu_>::operator()(const A0&, const A0&) const':
c:/R/r_libs-3.3.2/RcppNT2/include/boost/simd/ieee/functions/scalar/nextafter.hpp:73:14: error: '::_nextafter' has not been declared
return ::_nextafter(a0, a1);
^
Error: Failed to compile 'RcppNT2.h'
In addition: Warning message:
running command 'c:/Rtools/mingw_64/bin/g++ -x c++-header c:/R/r_libs-3.3.2/RcppNT2/include/RcppNT2.h -Ic:/R/r_libs-3.3.2/RcppNT2/include -I c:/R/r_libs-3.3.2/BH/include -IC:/R/R-3.3.2/include -std=c++11 -O2 -Wall -mtune=core2' had status 1
任何帮助或建议都将不胜感激。
答案 0 :(得分：3)
看起来你的MinGW版本不支持原始bessel和nextafter函数，或者RCpp使用的NT2版本没有打包应该处理的数学配置头。
不确定RCpp是如何预编译的，但是应该这样做，以便在MinGW BOOST_SIMD_HAS_YN是defiend并且BOOST_SIMD_HAS__YN未定义。