[Bug c++/15795] No way to teach operator new anything about alignment requirements

["jason at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From jason at gcc dot gnu dot org  2004-06-08 18:04 -------
Here is a more elegant workaround:

#include <xmmintrin.h>                                                         
                                                
#include <stdio.h>                                                             
                                                
#include <stdlib.h>                                                            
                                                
#include <new>                                                                 
                                                
                                                                               
                                                
class Vector4                                                                  
                                                
{                                                                              
                                                
public:                                                                        
                                                
  Vector4() { vec = _mm_setzero_ps(); }                                        
                                                
                                                                               
                                                
  void *operator new (size_t);                                                 
                                                
  void *operator new[] (size_t size) { return operator new (size); }           
                                                
                                                                               
                                                
  __m128 vec;                                                                  
                                                
};                                                                             
                                                
                                                                               
                                                
void *Vector4::operator new (size_t size)                                      
                                                
{                                                                              
                                                
  void *p;                                                                     
                                                
  int r = posix_memalign (&p, __alignof (Vector4), size);                      
                                                
  if (r)                                                                       
                                                
    throw std::bad_alloc ();                                                   
                                                
  return p;                                                                    
                                                
}                                                                              
                                                
                                                                               
                                                
int main(int argc, char **argv)                                                
                                                
{                                                                              
                                                
  Vector4 *foo = new Vector4[200*200];                                         
                                                
  delete foo;                                                                  
                                                
}                                                                              
                                                

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15795