[Bug tree-optimization/36034] [4.3/4.4 Regression] wrong code vectorizing unrolled loop

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2008-04-24 11:27 -------
<bb 2>:
  vect_px.14_32 = (vector double *) &x;
  vect_px.9_31 = vect_px.14_32;
  vect_ptmp.24_42 = (vector double *) &tmp;
  vect_ptmp.19_43 = vect_ptmp.24_42;

<bb 3>:
  # SMT.20_50 = PHI <SMT.20_58(4), SMT.20_51(D)(2)>
  # ivtmp.26_48 = PHI <ivtmp.26_49(4), 0(2)>
  # ivtmp.25_44 = PHI <ivtmp.25_45(4), vect_ptmp.19_43(2)>
  # ivtmp.15_35 = PHI <ivtmp.15_36(4), vect_px.9_31(2)>
  # tmp_34 = PHI <tmp_57(4), tmp_23(D)(2)>
  # VUSE <x_24(D), SMT.10_52(D)>
  vect_var_.16_37 = *ivtmp.15_35;
  ivtmp.15_38 = ivtmp.15_35 + 16;
  # VUSE <x_24(D), SMT.10_52(D)>
  vect_var_.17_39 = *ivtmp.15_38;
  ivtmp.15_40 = ivtmp.15_38 + 16;
  # VUSE <x_24(D), SMT.10_52(D)>
  vect_var_.18_41 = *ivtmp.15_40;
  # tmp_53 = VDEF <tmp_34>
  # SMT.20_54 = VDEF <SMT.20_50>
  *ivtmp.25_44 = vect_var_.16_37;
  ivtmp.25_46 = ivtmp.25_44 + 16;
  # tmp_55 = VDEF <tmp_53>
  # SMT.20_56 = VDEF <SMT.20_54>
  *ivtmp.25_46 = vect_var_.17_39;
  ivtmp.25_47 = ivtmp.25_46 + 16;
  # tmp_57 = VDEF <tmp_55>
  # SMT.20_58 = VDEF <SMT.20_56>
  *ivtmp.25_47 = vect_var_.18_41;
  ivtmp.15_36 = ivtmp.15_40 + 16;
  ivtmp.25_45 = ivtmp.25_47 + 16;
  ivtmp.26_49 = ivtmp.26_48 + 1;
  if (ivtmp.26_49 < 5)
    goto <bb 4>;
  else
    goto <bb 5>;

<bb 4>:
  goto <bb 3>;

the final increment for ivtmp.15_36 is wrong -- it should be 48.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36034