[Bug tree-optimization/19038] [4.0 Regression] out of ssa causing loops to have more than one BB

[steven at gcc dot gnu dot org]

------- Additional Comments From steven at gcc dot gnu dot org  2005-01-21 
13:27 -------
Correctemundo Zdenek! 
 
Before dom3: 
  # BLOCK 2 
  # PRED: 1 [100.0%]  (fallthru) 2 [89.0%]  (dfs_back,false,exec) 
  # ivtmp.3_12 = PHI <0(1), ivtmp.3_20(2)>; 
  # __BLNK___2 = PHI <__BLNK___8(1), __BLNK___11(2)>; 
<L8>:; 
  D.498_25 = (<unnamed type>) lsm_tmp.2_14; 
  D.499_26 = ivtmp.3_12 + D.498_25; 
  D.500_27 = D.499_26 + ffffffffffffffff; 
  D.501_28 = &__BLNK__.array1[D.500_27]; 
  ruatmp.9_29 = D.501_28; 
  #   __BLNK___11 = V_MAY_DEF <__BLNK___2>; 
  *ruatmp.9_29 = 1.0e+0; 
  ivtmp.3_20 = ivtmp.3_12 + 1; 
  D.503_30 = D.457_4 - lsm_tmp.2_14; 
  D.504_31 = (<unnamed type>) D.503_30; 
  D.505_32 = D.504_31 + 1; 
  if (ivtmp.3_20 == D.505_32) goto <L12>; else goto <L8>; 
  # SUCC: 3 [11.0%]  (loop_exit,true,exec) 2 [89.0%]  (dfs_back,false,exec) 
 
  # BLOCK 3 
  # PRED: 2 [11.0%]  (loop_exit,true,exec) 
  # ivtmp.3_24 = PHI <ivtmp.3_20(2)>; 
<L12>:; 
  D.496_21 = (<unnamed type>) lsm_tmp.2_14; 
  D.497_22 = ivtmp.3_24 + D.496_21; 
  lsm_tmp.2_23 = (int4) D.497_22; 
  lsm_tmp.2_19 = lsm_tmp.2_23; 
  #   j_7 = V_MUST_DEF <j_6>; 
  j = lsm_tmp.2_19; 
  # SUCC: 4 [100.0%]  (fallthru) 
 
After dom3: 
  # BLOCK 2 
  # PRED: 1 [100.0%]  (fallthru) 2 [89.0%]  (dfs_back,false,exec) 
  # ivtmp.3_12 = PHI <0(1), ivtmp.3_20(2)>; 
  # __BLNK___2 = PHI <__BLNK___8(1), __BLNK___11(2)>; 
<L8>:; 
  D.498_25 = 1; 
  D.499_26 = ivtmp.3_12 + 1; 
  D.500_27 = ivtmp.3_12; 
  D.501_28 = &__BLNK__.array1[ivtmp.3_12]; 
  ruatmp.9_29 = D.501_28; 
  #   __BLNK___11 = V_MAY_DEF <__BLNK___2>; 
  *D.501_28 = 1.0e+0; 
  ivtmp.3_20 = ivtmp.3_12 + 1; 
  D.503_30 = D.457_4 - 1; 
  D.504_31 = (<unnamed type>) D.503_30; 
  D.505_32 = D.504_31 + 1; 
  if (ivtmp.3_20 == D.505_32) goto <L12>; else goto <L8>; 
  # SUCC: 3 [11.0%]  (loop_exit,true,exec) 2 [89.0%]  (dfs_back,false,exec) 
 
  # BLOCK 3 
  # PRED: 2 [11.0%]  (loop_exit,true,exec) 
  # ivtmp.3_24 = PHI <ivtmp.3_20(2)>; 
<L12>:; 
  D.496_21 = 1; 
  D.497_22 = ivtmp.3_12 + 2; 
  lsm_tmp.2_23 = (int4) D.497_22; 
  lsm_tmp.2_19 = lsm_tmp.2_23; 
  #   j_7 = V_MUST_DEF <j_6>; 
  j = lsm_tmp.2_23; 
  # SUCC: 4 [100.0%]  (fallthru) 
 
 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19038