[Bug tree-optimization/35085] [4.3 Regression] gcc.dg/vect/vect-iv-9.c fails

[ubizjak at gmail dot com]

------- Comment #20 from ubizjak at gmail dot com  2008-02-07 09:01 -------
>From the logs:

tree-reassoc in failed case transforms:

  D.2020_7 = a[i_17];
  D.2021_8 = D.2020_7 + i_17;
  s_9 = D.2021_8 + s_18;

to:

  D.2020_7 = a[i_17];
  D.2021_8 = s_18 + i_17;
  s_9 = D.2021_8 + D.2020_7;


In my case, it transforms:

  D.2002_7 = a[i_18];
  D.2003_8 = D.2002_7 + i_18;
  s_9 = D.2003_8 + s_17;

to

  D.2002_7 = a[i_18];
  D.2003_8 = i_18 + D.2002_7;
  s_9 = D.2003_8 + s_17;
  i_10 = i_18 + 1;

What happens if you add -fno-tree-reassoc to your compile flags? In my case it
still vectorizes both loops.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35085