read write benchmark

__attribute__(aligned(16)) char buf[1000];

/* test code(–{“–‚Íasm‚Å) */
template<typename T>
void read(char *buf, int n, int size, int offset)
{
	for (int i = 0; i < n; i++) {
		T tmp = *reinterpret_cast<*T>(&buf[i * size + offset]);
	}
}


read

size = 16

-----------------------------------------------------------------------------
     offset  +0  +1  +2  +3  +4  +5  +6  +7  +8  +9 +10 +11 +12 +13 +14 +15
long double 1.7 1.7 1.7 1.7 1.7 1.7 1.7 5.8 1.7 5.1 5.1 5.1 5.1 5.1 5.1 5.1
     double 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 5.0 5.0 5.0 5.0 5.0 5.0 5.0
      float 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 5.0 5.0 5.0
        int 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 4.4 4.4 4.4
      short 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 5.4
       char 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6
-----------------------------------------------------------------------------


-----------------------------------------------------------------------------
size = 8
     offset  +0  +1  +2  +3  +4  +5  +6  +7
     double 0.5 2.2 2.2 2.2 2.2 2.2 2.2 2.2
      float 0.5 0.5 0.5 0.5 0.5 2.2 2.2 2.2
        int 0.6 0.6 0.6 0.6 0.6 1.9 1.9 1.9
      short 0.9 0.9 0.9 0.9 0.9 0.9 0.9 2.3
       char 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9
-----------------------------------------------------------------------------

-----------------------------------------------------------------------------
size = 4
     offset  +0  +1  +2  +3
       int  0.4 0.5 0.5 0.5
     short  0.4 0.4 0.4 0.8
      char  0.4 0.4 0.4 0.4
-----------------------------------------------------------------------------

write

size = 16

-----------------------------------------------------------------------------
     offset  +0  +1  +2  +3  +4  +5  +6  +7  +8  +9 +10 +11 +12 +13 +14 +15
long double 2.1 2.1 2.1 2.1 2.1 2.1 2.1 9.1 2.1 5.0 5.0 5.0 5.0 5.0 5.0 5.0
     double 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 4.5 4.5 4.5 4.5 4.5 4.5 4.5
      float 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 4.5 4.5 4.5
        int 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 4.7 4.7 4.7
      short 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 4.7
       char 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7
-----------------------------------------------------------------------------

-----------------------------------------------------------------------------
size = 8
     offset  +0  +1  +2  +3  +4  +5  +6  +7
     double 1.6 3.4 3.4 3.4 3.4 3.4 3.4 3.4
      float 1.6 1.6 1.6 1.6 1.6 3.4 3.4 3.4
        int 0.8 0.8 0.8 0.8 0.8 2.9 2.9 2.9
      short 0.8 0.8 0.8 0.8 0.8 0.8 0.8 2.9
       char 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8
-----------------------------------------------------------------------------

-----------------------------------------------------------------------------
size = 4
     offset  +0  +1  +2  +3
     float  1.7 2.7 2.7 2.7
       int  0.8 1.6 1.6 1.6
     short  0.8 0.8 0.8 1.6
      char  0.8 0.8 0.8 0.8
-----------------------------------------------------------------------------

-----------------------------------------------------------------------------
size = 2
     offset  +0  +1
     short  0.7 1.3
      char  0.8 0.8
-----------------------------------------------------------------------------