paddb vs paddw

Ankit Jain ankitjain1580@yahoo.com
Thu Dec 23 11:00:00 GMT 2004


      1 #include<stdio.h>
      2 #include<inttypes.h>
      3 int main()
      4 {
      5         uint8_t
a[8]={1,2,3,4,5,6,7,8},b[8]={1,2,3,4,5,6,7,8},i;
      6         asm("movq (%1), %%mm0 \n"
      7             "paddb (%0), %%mm0 \n"
      8             "movq  %%mm0, (%0) \n"
      9                 :
     10                 :"r"(b),"r"(a)
     11                 :"%mm0"
     12         );
     13         for(i=0;i<8;i++)
     14         printf("%d ",b[i]);
     15         return 0;
     16 }
     17
Both the programs give the same output

WHY IS IT SO? i am using paddb and paddw. it dosent
make any diff?

  1 #include<stdio.h>
      2 #include<inttypes.h>
      3 int main()
      4 {
      5         uint8_t
a[8]={1,2,3,4,5,6,7,8},b[8]={1,2,3,4,5,6,7,8},i;
      6         asm("movq (%1), %%mm0 \n"
      7             "paddd (%0), %%mm0 \n"
      8             "movq  %%mm0, (%0) \n"
      9                 :
     10                 :"r"(b),"r"(a)
     11                 :"%mm0"
     12         );
     13         for(i=0;i<8;i++)
     14         printf("%d ",b[i]);
     15         return 0;
     16 }
     17
~

ankit jain

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