[Bug target/40243] no aligned instruction generated for i386

[abhishek dot shrivastav24 at gmail dot com]

------- Comment #2 from abhishek dot shrivastav24 at gmail dot com  2009-05-25 
14:36 -------
(In reply to comment #1)
> Works for me (your simple program is not a valid program).
> 

The whole program is like this:

/* sample.c */
#include <stdio.h>
#define N 1000
int main()
{
   int a[N], b[N], c[N], i;
       for(i=0;i<N;i++)
           b[i]=c[i]=i;

     for(i=0;i<N;i++)
         a[i]=b[i]+c[i];

       for(i=0;i<N;i++)
        printf("%d", a[i]);
}

compile using gcc version 4.3.*, using
gcc -S -ftree-vectorize -ftree-vectorizer-verbose=10 -msse2 -O2 sample.c

Now, view the assembly file generated and also the verbose, it always prints
when analyzing in function vect_analyze_data_refs_alignment ***can't force
alignment of ref: b[i_43]***, while it does not need alignment, as it is
already aligned.

Simply changed the instruction movdqu to movdqa and no segmentation fault would
occur, as the array references are aligned.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40243