------- Comment #11 from spop at gcc dot gnu dot org  2010-05-25 23:33 -------
This is not a IV type problem: the number of iterations may be zero when mid ==
0 or mid == n, so the number of iterations analysis has a condition under which
niter may_be_zero.

I sent out a patch that makes niter return a COND_EXPR
instead of a chrec_dont_know:
http://gcc.gnu.org/ml/gcc-patches/2010-05/msg01927.html

With that patch I now get 
  note: not vectorized: data ref analysis failed D.2726_51 = a[var.9_55];


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43423

Reply via email to