Re: [nt2-dev] nt2::exp with boost::simd::pack<float>

[Joel FALCOU]

hi

p_t res2 = nt2::exp(res);

is all you need to write.

Regards


On 30/11/2015 03:45, Shengxi Duan wrote:
> Hi,
> I am new to NT2, Can you help me with this compiler error
>
> Thanks,
> Steve
>
>
> #include <boost/simd/sdk/simd/pack.hpp>
> #include <boost/simd/sdk/simd/io.hpp>
> #include <boost/simd/include/functions/splat.hpp>
> #include <boost/simd/include/functions/plus.hpp>
> #include <boost/simd/include/functions/multiplies.hpp>
> #include <nt2/include/functions/exp.hpp>
>
>
>
> int main()
> {
> using namespace nt2;
> using namespace boost::simd;
>
> typedef boost::simd::pack<float> p_t;
>
> p_t res;
> p_t u(10);
> p_t r = boost::simd::splat<p_t>(11);
>
> res = (u + r) * 2.f;
> p_t res2 = nt2::exp<p_t>(res); // <---- this line with compiler error
>
> }
>
>
> boost/simd/sdk/simd/pack/expression.hpp:54:7: required from ‘typename
> boost::disable_if<boost::is_base_of<boost::simd::expression<Expression,
> ResultType>, Xpr>, boost::simd::expression<Expression,
> ResultType>&>::type boost::simd::expression<Expression,
> ResultType>::operator=(const Xpr&) [with Xpr =
> boost::simd::expression<boost::proto::exprns_::expr<nt2::tag::exp_,
> boost::proto::argsns_::list1<boost::simd::expression<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal,
> boost::proto::argsns_::term<const boost::simd::native<float,
> boost::simd::tag::sse_, void>&>, 0l>, const boost::simd::native<float,
> boost::simd::tag::sse_, void>&> >, 1l>, boost::simd::native<float,
> boost::simd::tag::sse_, void> >; Expr =
> boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal,
> boost::proto::argsns_::term<boost::simd::native<float,
> boost::simd::tag::sse_, void> >, 0l>; ResultType =
> boost::simd::native<float, boost::simd::tag::sse_, void>; typename
> boost::disable_if<boost::is_base_of<boost::simd::expression<Expression,
> ResultType>, Xpr>, boost::simd::expression<Expression,
> ResultType>&>::type =
> boost::simd::expression<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal,
> boost::proto::argsns_::term<boost::simd::native<float,
> boost::simd::tag::sse_, void> >, 0l>, boost::simd::native<float,
> boost::simd::tag::sse_, void> >&]’
> /ctc/sw/v6/Vendor/boost_simd/linux64/3.1.0/include/boost/simd/sdk/simd/pack/pack.hpp:176:35:
> required from ‘boost::simd::pack<Type, Cardinal>::pack(const T&,
> typename T::proto_is_expr_*) [with T =
> boost::simd::expression<boost::proto::exprns_::expr<nt2::tag::exp_,
> boost::proto::argsns_::list1<boost::simd::expression<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal,
> boost::proto::argsns_::term<const boost::simd::native<float,
> boost::simd::tag::sse_, void>&>, 0l>, const boost::simd::native<float,
> boost::simd::tag::sse_, void>&> >, 1l>, boost::simd::native<float,
> boost::simd::tag::sse_, void> >; Type = float; long unsigned int
> Cardinal = 4ul; typename T::proto_is_expr_ = void]’
>
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[Joel FALCOU]

That's a g++ bug.

You can fix it by adding

-DBOOST_SIMD_NO_STRICT_ALAISING -fno-strict-aliasing

to your command line.

On 30/11/2015 12:32, Shengxi Duan wrote:
> Joel,
> Thanks for your reply. I tried that

>
> p_t res2 = nt2::exp(res);
>

> and still got error:

>
> /boost/simd/sdk/simd/pack/pack.hpp:176:35: required from
> ‘boost::simd::pack<Type, Cardinal>::pack(const T&, typename
> T::proto_is_expr_*) [with T =
> boost::simd::expression<boost::proto::exprns_::expr<nt2::tag::exp_,
> boost::proto::argsns_::list1<boost::simd::expression<boost::proto::exprns_::basic_expr<boost::proto::tagns_::tag::terminal,
> boost::proto::argsns_::term<const boost::simd::native<float,
> boost::simd::tag::sse_, void>&>, 0l>, const boost::simd::native<float,
> boost::simd::tag::sse_, void>&> >, 1l>, boost::simd::native<float,
> boost::simd::tag::sse_, void> >; Type = float; long unsigned int
> Cardinal = 4ul; typename T::proto_is_expr_ = void]’

> nt2_2.cpp:26:26: required from here
> /ctc/sw/v6/14.12/include/boost/type_traits/detail/cv_traits_impl.hpp:105:1:
> internal compiler error: in finish_member_declaration, at
> cp/semantics.c:2687
> {

> > an email to nt2-dev+u...@googlegroups.com <javascript:>
> > <mailto:nt2-dev+u...@googlegroups.com <javascript:>>.

> > For more options, visit https://groups.google.com/d/optout

> <https://groups.google.com/d/optout>.

[Joel FALCOU]

On 01/12/2015 21:00, Shengxi Duan wrote:
> Joel,

> Thanks again for your response.
> I tried your suggestion with g++4.8.3, still getting error (see below).
>
> However if I add a line that uses scalar version of nt2::exp before the
> line that uses simd version of nt2, then the program compiled ok with
> g++4.8.3.
>

This is indeed strange and incorrect. Let me dig into this a bit deeper.

[Joel FALCOU]

Can you however send me the total log of error not just thix excerpt
and your full command line used to compile

[Joel FALCOU]

On 02/12/2015 15:36, Shengxi Duan wrote:
>
> Joel,
>
> The command:
>
>
> g++ -DBOOST_SIMD_NO_STRICT_ALAISING -fno-strict-aliasing -std=c++11
> nt2_3.cpp -O3 -o nt2 -I$BOOST_SIMD_ROOT/3.1.0/include/ -I
> $BOOSTROOT/5.7/boost/include -I $NT2/3.1.0/include

must be -DBOOST_SIMD_NO_STRICT_ALIASING not
-DBOOST_SIMD_NO_STRICT_ALAISING

or is it a typo in the email ?

[Joel FALCOU]

Sorry for that then ;)

On 02/12/2015 16:54, Shengxi Duan wrote:
> Joel,
> Yes, that worked. I copied the flag from your original post, which had
> the typo in it.
> Thanks a lot for your help.
>
> Steve