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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/57223] Auto-vectorization fails for nested multiple loops depending on type of array
Date: Thu, 26 Sep 2013 14:53:00 -0000	[thread overview]
Message-ID: <bug-57223-4-J0Sxw2Eiax@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-57223-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57223

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Testcase for the PRE issue:

typedef float test_t;
void foo(test_t * d, int n)
{
  int i, j, k;
  for (k=0; k<n; ++k) {
      for (i=0; i<n; ++i) {
          test_t t;
          j = k;
          t = d[i*n+k] + d[k*n+j];
          d[i*n+j] = (d[i*n+j] < t) ? d[i*n+j] : t;
          for (j=k+1; j<n; ++j) {
              t = d[i*n+k] + d[k*n+j];
              d[i*n+j] = (d[i*n+j] < t) ? d[i*n+j] : t;
          }
      }
  }
}

for which I think we have (simpler) duplicates.  We do not inhibit
PRE from removing partial memory redundancies just because we vectorize.


  parent reply	other threads:[~2013-09-26 14:53 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <bug-57223-4@http.gcc.gnu.org/bugzilla/>
2013-05-09  5:06 ` snagavallis at outlook dot com
2013-05-09  5:11 ` snagavallis at outlook dot com
2013-09-26  8:45 ` y.usishchev at samsung dot com
2013-09-26  9:23 ` rguenth at gcc dot gnu.org
2013-09-26 14:47 ` rguenth at gcc dot gnu.org
2013-09-26 14:53 ` rguenth at gcc dot gnu.org [this message]
2013-09-26 14:57 ` rguenth at gcc dot gnu.org

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