the wrap_around_unsafe flag is supposed to be used to guard that.
Also, it is supposed to be turn off for O3, as I recall
sun
On Wed, Sep 22, 2010 at 4:57 AM, Dror Maydan <may...@tensilica.com> wrote:
> We ran into the following bug.
>
> int a[1024];
> void r(unsigned int n)
> {
> unsigned int i,j;
> for (i=0; i<n; i++) {
> for (j=0; j<n; j++) {
> a[i]++;
> }
> }
> }
>
>
> At -O3, LNO outer unrolls the outer loop by setting the bound to
> "i<n-u+1", creating an infinite loop whenever "n" is less than the
> unroll factor. My memory is faded, but I thought it wasn't supposed to
> do that for unsigned loops. From a quick scan of the code, I didn't
> find anything that checks. Anyone have experience with this or a better
> recollection than I do?
>
> Dror
>
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