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From: "vincenzo.innocente at cern dot ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/55334] mgrid regression (ipa-cp disables vectorization)
Date: Fri, 16 Nov 2012 13:59:00 -0000
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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];
}