在GCC下使用-std = C++ 11時，__v2di聲明在哪裏？

Question

我在使用-std=c++11時無法編譯GCC 4.9下的一些代碼。 GCC 4.9在Debian 8.5（Stable）下提供，所以它相當受歡迎。

相關的代碼是：

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

試圖編譯它導致：

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) 
^ 

它沒有很大的意義，直到我去grepping爲__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), 

看來GCC執行一箇中間轉換爲__v2di，但是缺少。包括GCC的<x86intrin.h>超級標頭不提供它。

我找不到__v2di通過grepping通過源文件。它可能在那裏，但我一直無法找到它。請參閱下面的greps。

在GCC下的-std=c++11中，__v2di在哪裏申明或定義？

---

這裏的另一種扭曲......它的工作原理沒有-std=...，但它失敗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構建，__v2di在emmintrin.h定義爲：

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