http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50693
Ira Rosen <irar at il dot ibm.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |irar at il dot ibm.com --- Comment #11 from Ira Rosen <irar at il dot ibm.com> 2011-10-11 07:15:15 UTC --- The vectorizer doesn't handle control flow in loop, and for the second loop we have: <bb 3>: goto <bb 7> (copy_block); loop_back: if (n_3(D) > i_10) goto <bb 6>; else goto <bb 5>; <bb 5>: pretmp.20_6 = v_20->chars; goto <bb 8> (end); <bb 6>: pretmp.20_2 = v_20->chars; # i_29 = PHI <i_10(6), 0(3)> # prephitmp.21_1 = PHI <pretmp.20_2(6), D.4528_22(3)> copy_block: D.4443_8 = prephitmp.21_1 + i_29; *D.4443_8 = c_9(D); i_10 = i_29 + 1; goto <bb 4> (loop_back);