[PATCH] Enabling Software Prefetching by Default at -O3

[Andreas Krebbel]

Hi,

> This patch serves as a proposal to turn on software prefetching by default at -O3.

We probably also should remove these warnings if -fprefetch-loop-arrays hasn't been
specified explicitly:

#ifndef HAVE_prefetch
  if (flag_prefetch_loop_arrays)
    {
      warning (0, "-fprefetch-loop-arrays not supported for this target");
      flag_prefetch_loop_arrays = 0;
    }
#else
  if (flag_prefetch_loop_arrays && !HAVE_prefetch)
    {
      warning (0, "-fprefetch-loop-arrays not supported for this target (try -march
switches)");
      flag_prefetch_loop_arrays = 0;
    }
#endif

Bye,

-Andreas-