[Bug tree-optimization/41728] [4.5 Regression] error: SSA name in freelist but still referenced

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2009-10-16 12:09 -------
After DOM2 we have

<bb 2>:
  D.2725_21 = a[0];
  D.2706_26 = D.2725_21;
  D.2708_28 = a[1];
  a_I_lsm0.4_29 = D.2708_28;
  lrc_30 = D.2725_21 != D.2708_28;
...

but

D.2725_21 : --> single use.
D.2706_26 = D.2725_21;

DOM changes

  lrc_30 = [cond_expr] D.2706_26 == D.2708_28 ? 0 : 1;

to

  lrc_30 = D.2725_21 != D.2708_28;

and likely misses an update_stmt() (again).


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41728