当在GCC下使用-std = c ++ 11时，声明__v2di在哪里？ [英] Where is __v2di declared when using -std=c++11 under GCC?

问题描述

使用 -std = c ++ 11 时，在GCC 4.9下编译一些代码时遇到问题。 GCC 4.9是在Debian 8.5（稳定版）下提供的，因此它相当受欢迎。

相关代码是：

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

尝试编译它会导致：

 在/usr/lib/gcc/x86_64-linux-gnu/4.9/include/x86intrin.h:43:0中包含的文件中，
来自/usr/include/x86_64-linux-gnu/c++/4.9/bits/opt_random.h:33，
来自/usr/include/c++/4.9/random:50, 
来自/usr/include/c++/4.9/bits/stl_algo.h:66，
来自/usr/include/c++/4.9/algorithm:62, 
 ... 
错误： expected'）'before'__builtin_ia32_pclmulqdq128'
 clmulepi64_si128（__m128i a，__m128i b，const int i）
 ^ 
  

除非我为 __ builtin_ia32_pclmulqdq128 ：

class =lang-none prettyprint-override> $ 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），


看起来GCC对 __ v2di 执行中间转换，但缺少 __ v2di 包括GCC的< x86intrin.h> 超级标题不提供它。

code> __ v2di 通过greping通过源文件它可能在那里，但我没有能够找到它下面的 greps 。

-std = c ++时， __ v2di 11 在GCC下？

---

这里有另一个扭曲...它不需要 -std = ... ，但它失败并且 std = c ++ 11 ：

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

  $ make CXXFLAGS =-DDEBUG -g3 -O0 -std = c ++ 11  - fPIC -march = native -pipevmac.o 
 g ++ -DDEBUG -g3 -O0 -std = c ++ 11 -fPIC -march = native -pipe -c vmac.cpp 
在包含的文件中/usr/lib/gcc/x86_64-linux-gnu/4.9/include/x86intrin.h:43:0，
来自/usr/include/x86_64-linux-gnu/c++/4.9/bits/opt_random.h ：33，
来自/usr/include/c++/4.9/random:50，
来自/usr/include/c++/4.9/bits/stl_algo.h:66，
来自/ 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};在我的v6版本中， 

在我的v6版本中，





在emmintrin.h中定义为：

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

I'm having trouble compiling some code under GCC 4.9 when using -std=c++11. GCC 4.9 is provided under Debian 8.5 (Stable), so its fairly popular.

The relevant code is:

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

Attempting to compile it results in:

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)
 ^

It does not make a lot of sense until I go grepping for __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),  

It appears GCC performs an intermediate cast to __v2di, but __v2di is missing. Including GCC's <x86intrin.h> super header does not provide it.

I can't find __v2di by grepping through the source files. Its probably there, but I have not been able to locate it. See below for the greps.

Where is __v2di declared or defined when -std=c++11 under GCC?

---

Here's another twist... It works without -std=..., but it fails with std=c++11:

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

And:

$ 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 };

解决方案

In my v6 build, __v2di is defined in emmintrin.h as:

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

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