错误：'_mm_prefetch'未在此范围内声明

Question

我正在用g ++ 4.7编译redhat Linux中的算法代码，但遇到一些问题。头文件是一个C++文件的用途是波纹管：

但在编译的时候，它会出现一些错误，比如

error: '_mm_prefetch' was not declared in this scope 
error: '_MM_HINT_T0' was not declared in this scope 

我怎么能解决这个问题？非常感谢你！！

#include <cmath> 
#include <memory> 
#include <iostream> 
#include <mmintrin.h> 

#include "space.h" 
#include "knnquery.h" 
#include "rangequery.h" 
#include "ported_boost_progress.h" 
#include "method/small_world_rand.h" 
#include "sort_arr_bi.h" 

#include <vector> 
#include <set> 
#include <map> 
#include <sstream> 
#include <typeinfo> 

//#define START_WITH_E0 
#define START_WITH_E0_AT_QUERY_TIME 

#define USE_BITSET_FOR_INDEXING 1 
//#define USE_ALTERNATIVE_FOR_INDEXING 

namespace similarity { 

using namespace std; 

template <typename dist_t> 
struct IndexThreadParamsSW { 
    const Space<dist_t>&      space_; 
    SmallWorldRand<dist_t>&      index_; 
const ObjectVector& data_; 

在这个C++文件中，有使用该代码的地方：

for (MSWNode* neighbor : (currEv.getMSWNode())->getAllFriends()) { 
     _mm_prefetch(reinterpret_cast<const char*>(const_cast<const Object*>(neighbor->getData())), _MM_HINT_T0); 
     } 
     for (MSWNode* neighbor : (currEv.getMSWNode())->getAllFriends()) { 
     _mm_prefetch(const_cast<const char*>(neighbor->getData()->data()), _MM_HINT_T0); 
} 

Answer 1

您需要包括<xmmintrin.h>除了<mmintrin.h>。