|                                      
Assembly output from `hand_coded.c'      |Assembly output from `conv_kernel.cxx'
gcc -O3 v. 4.0.0 Xeon                    |gcc -O3 v. 4.0.0 Xeon                 
_________________________________________|______________________________________
                                         |                                      
 _Z3foov:                                | _Z3foov:
 .LFB2:                                  | .LFB1618:
         pushl   %ebp                    |     pushl   %ebp
 .LCFI0:                                 | .LCFI0:
         movl    %esp, %ebp              |     movl    %esp, %ebp
 .LCFI1:                                 | .LCFI1:
         pushl   %esi                    |     pushl   %esi
 .LCFI2:                                 | .LCFI2:
         pushl   %ebx                    |     pushl   %ebx
 .LCFI3:                                 | .LCFI3:
         movl    data, %ebx              |     movl    external_data, %ebx
         movl    -32(%ebx), %esi         |     movl    32(%ebx), %esi
         movl    32(%ebx), %edx          |     movl    28(%ebx), %ecx
         addl    %esi, %edx              |     movl    -32(%ebx), %edx
         leal    (%edx,%edx,2), %edx     |     movl    -28(%ebx), %eax
         movl    %edx, a                 |     addl    %esi, %edx              
         movl    -28(%ebx), %ecx         |     movl    24(%ebx), %esi
         movl    28(%ebx), %eax          |     addl    %ecx, %eax              
         addl    %ecx, %eax              |     movl    20(%ebx), %ecx
         leal    (%eax,%eax,2), %eax     |     leal    (%edx,%edx,2), %edx     
         leal    (%edx,%eax,4), %eax     |     leal    (%eax,%eax,2), %eax     
         movl    %eax, a                 |     leal    (%edx,%eax,4), %eax     
         movl    -24(%ebx), %esi         |     movl    -24(%ebx), %edx
         movl    24(%ebx), %edx          |     addl    %esi, %edx              
         addl    %esi, %edx              |     movl    16(%ebx), %esi
         leal    (%edx,%edx,8), %edx     |     leal    (%edx,%edx,8), %edx     
         leal    (%eax,%edx,4), %edx     |     leal    (%eax,%edx,4), %edx     
         movl    %edx, a                 |     movl    -20(%ebx), %eax
         movl    -20(%ebx), %ecx         |     addl    %ecx, %eax              
         movl    20(%ebx), %eax          |     leal    (%eax,%eax,4), %ecx     
         addl    %ecx, %eax              |     leal    (%eax,%ecx,2), %ecx     
         leal    (%eax,%eax,4), %ecx     |     leal    (%edx,%ecx,8), %ecx     
         leal    (%eax,%ecx,2), %ecx     |     movl    -16(%ebx), %edx         
         leal    (%edx,%ecx,8), %ecx     |     addl    %esi, %edx              
         movl    %ecx, a                 |     leal    (%edx,%edx,2), %esi     
         movl    -16(%ebx), %esi         |     movl    %esi, %eax              
         movl    16(%ebx), %edx          |     sall    $4, %eax                
         addl    %esi, %edx              |     subl    %esi, %eax              
         leal    (%edx,%edx,2), %esi     |     movl    8(%ebx), %esi           
         movl    %esi, %eax              |     leal    (%edx,%eax,4), %eax     
         sall    $4, %eax                |     movl    12(%ebx), %edx
         subl    %esi, %eax              |     addl    %eax, %ecx              
         leal    (%edx,%eax,4), %eax     |     movl    -12(%ebx), %eax
         addl    %eax, %ecx              |     addl    %edx, %eax
         movl    %ecx, a                 |     movl    4(%ebx), %edx
         movl    -12(%ebx), %edx         |     imull   $318, %eax, %eax        
         movl    12(%ebx), %eax          |     addl    %eax, %ecx              
         addl    %edx, %eax              |     movl    -8(%ebx), %eax
         imull   $318, %eax, %eax        |     addl    %esi, %eax
         addl    %eax, %ecx              |     imull   $474, %eax, %eax
         movl    %ecx, a                 |     addl    %eax, %ecx              
         movl    -8(%ebx), %esi          |     movl    -4(%ebx), %eax
         movl    8(%ebx), %eax           |     addl    %edx, %eax
         addl    %esi, %eax              |     movl    (%ebx), %edx
         imull   $474, %eax, %eax        |     imull   $603, %eax, %eax        
         addl    %eax, %ecx              |     popl    %ebx
         movl    %ecx, a                 |     popl    %esi
         movl    -4(%ebx), %edx          |     addl    %eax, %ecx              
         movl    4(%ebx), %eax           |     leal    (%edx,%edx,8), %eax     
         addl    %edx, %eax              |     leal    (%eax,%eax,8), %eax     
         imull   $603, %eax, %eax        |     leal    (%edx,%eax,2), %eax     
         addl    %eax, %ecx              |     leal    (%edx,%eax,4), %eax     
         movl    %ecx, a                 |     addl    %eax, %ecx              
         movl    (%ebx), %edx            |     movl    %ecx, %eax              
         popl    %ebx                    |     sarl    $31, %eax
         popl    %esi                    |     shrl    $20, %eax
         leal    (%edx,%edx,8), %eax     |     popl    %ebp
         leal    (%eax,%eax,8), %eax     |     addl    %ecx, %eax
         leal    (%edx,%eax,2), %eax     |     sarl    $12, %eax               
         leal    (%edx,%eax,4), %eax     |     movl    %eax, external_num
         movl    $540433339, %edx        |     ret
         addl    %eax, %ecx              | 
         movl    %ecx, %eax              | 
         imull   %edx                    | 
         popl    %ebp                    | 
         sarl    $31, %ecx               | 
         sarl    $9, %edx                | 
         subl    %ecx, %edx              | 
         movl    %edx, a                 | 
         ret                             |