在GCC下使用-std = C++ 11时，__v2di声明在哪里？

Question

我在使用-std=c++11时无法编译GCC 4.9下的一些代码。 GCC 4.9在Debian 8.5（Stable）下提供，所以它相当受欢迎。

相关的代码是：

__inline __m128i 
clmulepi64_si128 (__m128i a, __m128i b, const int i) 
{ 
    asm ("pclmulqdq %2, %1, %0" : "+x"(a) : "xm"(b), "i"(i)); 
    return a; 
} 

试图编译它导致：

In file included from /usr/lib/gcc/x86_64-linux-gnu/4.9/include/x86intrin.h:43:0, 
       from /usr/include/x86_64-linux-gnu/c++/4.9/bits/opt_random.h:33, 
       from /usr/include/c++/4.9/random:50, 
       from /usr/include/c++/4.9/bits/stl_algo.h:66, 
       from /usr/include/c++/4.9/algorithm:62, 
       ... 
error: expected ‘)’ before ‘__builtin_ia32_pclmulqdq128’ 
clmulepi64_si128 (__m128i a, __m128i b, const int i) 
^ 

它没有很大的意义，直到我去grepping为__builtin_ia32_pclmulqdq128：

$ grep -IR '__builtin_ia32_pclmulqdq128' /usr/lib 2>/dev/null | grep -iv clang 
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/wmmintrin.h: return (__m128i) __builtin_ia32_pclmulqdq128 ((__v2di)__X, 
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/wmmintrin.h: ((__m128i) __builtin_ia32_pclmulqdq128 ((__v2di)(__m128i)(X), 

看来GCC执行一个中间转换为__v2di，但是缺少。包括GCC的<x86intrin.h>超级标头不提供它。

我找不到__v2di通过grepping通过源文件。它可能在那里，但我一直无法找到它。请参阅下面的greps。

在GCC下的-std=c++11中，__v2di在哪里申明或定义？

---

这里的另一种扭曲......它的工作原理没有-std=...，但它失败std=c++11：

$ make CXXFLAGS=" -DDEBUG -g3 -O0 -fPIC -march=native" vmac.o 
g++ -DDEBUG -g3 -O0 -fPIC -march=native -c vmac.cpp 
$ 

和：

$ make CXXFLAGS=" -DDEBUG -g3 -O0 -std=c++11 -fPIC -march=native -pipe" vmac.o 
g++ -DDEBUG -g3 -O0 -std=c++11 -fPIC -march=native -pipe -c vmac.cpp 
In file included from /usr/lib/gcc/x86_64-linux-gnu/4.9/include/x86intrin.h:43:0, 
       from /usr/include/x86_64-linux-gnu/c++/4.9/bits/opt_random.h:33, 
       from /usr/include/c++/4.9/random:50, 
       from /usr/include/c++/4.9/bits/stl_algo.h:66, 
       from /usr/include/c++/4.9/algorithm:62, 

---

$ grep -IR '__v2di' /usr/lib 2>/dev/null | grep -iv clang | grep 'define' 
$ 

$ grep -IR '__v2di' /usr/lib 2>/dev/null | grep -iv clang | grep 'struct' 
$ 

$ grep -IR '__v2di' /usr/lib 2>/dev/null | grep -iv clang | grep '}'                    
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/avx2intrin.h: __v2di src = __extension__ (__v2di){ 0, 0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/avx2intrin.h: __v2di mask = __extension__ (__v2di){ ~0, ~0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/avx2intrin.h: __v2di src = __extension__ (__v2di){ 0, 0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/avx2intrin.h: __v2di mask = __extension__ (__v2di){ ~0, ~0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/emmintrin.h: return __extension__ (__m128i)(__v2di){ __q0, __q1 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9.2/include/avx2intrin.h: __v2di src = __extension__ (__v2di){ 0, 0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9.2/include/avx2intrin.h: __v2di mask = __extension__ (__v2di){ ~0, ~0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9.2/include/avx2intrin.h: __v2di src = __extension__ (__v2di){ 0, 0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9.2/include/avx2intrin.h: __v2di mask = __extension__ (__v2di){ ~0, ~0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9.2/include/emmintrin.h: return __extension__ (__m128i)(__v2di){ __q0, __q1 }; 

$ grep -IR '__v2di' /usr/lib 2>/dev/null | grep -iv clang | grep '{' 
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/avx2intrin.h: __v2di src = __extension__ (__v2di){ 0, 0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/avx2intrin.h: __v2di mask = __extension__ (__v2di){ ~0, ~0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/avx2intrin.h: __v2di src = __extension__ (__v2di){ 0, 0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/avx2intrin.h: __v2di mask = __extension__ (__v2di){ ~0, ~0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9/include/emmintrin.h: return __extension__ (__m128i)(__v2di){ __q0, __q1 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9.2/include/avx2intrin.h: __v2di src = __extension__ (__v2di){ 0, 0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9.2/include/avx2intrin.h: __v2di mask = __extension__ (__v2di){ ~0, ~0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9.2/include/avx2intrin.h: __v2di src = __extension__ (__v2di){ 0, 0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9.2/include/avx2intrin.h: __v2di mask = __extension__ (__v2di){ ~0, ~0 }; 
/usr/lib/gcc/x86_64-linux-gnu/4.9.2/include/emmintrin.h: return __extension__ (__m128i)(__v2di){ __q0, __q1 }; 

Answer 1

在我的V6构建，__v2di在emmintrin.h定义为：

typedef long long __v2di __attribute__ ((__vector_size__ (16)));