[Bug tree-optimization/55334] mgrid regression (ipa-cp disables vectorization)

[vincenzo.innocente at cern dot ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55334



--- Comment #12 from vincenzo Innocente <vincenzo.innocente at cern dot ch> 
2012-11-16 13:58:33 UTC ---

so a "better" c case is 

float * mem;

void sumN(int n) {

  float * a=mem;

  /*const*/ float * b=mem+n;

  /*const*/ float * c=mem+2*n;

  for (int i=0;i!=n;++i)

    a[i]=b[i]+c[i];

}