I mean loop interchange. Generally, MipsPro will do loop interchange and
tiling with this code.
On Tue, 12 Sep 2000, Peng Tu wrote:
> For this C program, I don't see why it is beneficial to interchange
> the loop because the inner loop is already stride-1 (C is row-major).
> It does need an unroll-and-jam transformation to capture the reuse
> of the outer loop though. Maybe the LNO machine model is not up-to-date
> with the IA64.
> A useful flag to try for C program is -OPT:alias=restrict if the array is
> an input parameter.
> On Tuesday, September 12, 2000 11:07 AM, Ziang Hu
> [SMTP:hu@xxxxxxxxxxxxxxxxxxx] wrote:
> > Hi,
> > I tried to test the effect of LNO with Pro64. The code is as follows:
> > ...
> > for (i=0; i<1000; i++)
> > for (j=0; j<1000; j++)
> > a[i][j] = a[i][j] + a[i-1][j];
> > ...
> > With -O3, no loop interchange happened.
> > How about LNO with C programs ?
> > Thanks
> > Ziang