[Bug tree-optimization/25623] New: DOM messes up "incoming frequencies" for some BBs

[pinskia at gcc dot gnu dot org]

Testcase:
SUBROUTINE S42(a,b,c,N)
 IMPLICIT NONE
 integer :: N
 real*8  :: a(N),b(N),c(N),tmp,tmp2,tmp4
 real*8, parameter :: p=1.0D0/3.0D0
 integer :: i
 c=0.0D0
 DO i=1,N
   tmp=a(i)**p ! could even be done with a cube root
   tmp2=tmp*tmp
   tmp4=tmp2*tmp2
   b(i)=b(i)+tmp4
   c(i)=c(i)+tmp2
 ENDDO
END SUBROUTINE
------------
in .t50.dom2:
<bb 2>:
  D.824_4 = *n_3;
  if (D.824_4 <= 0) goto <L16>; else goto <L1>;

  # S.7_5 = PHI <S.7_32(3), 1(2)>;
<L1>:;
  D.826_31 = S.7_5 + -1;
  (*c_26)[D.826_31] = 0.0;
  S.7_32 = S.7_5 + 1;
  if (D.824_4 < S.7_32) goto L.4; else goto <L1>;

Invalid sum of incoming frequencies 900, should be 0
L.4:;

Invalid sum of incoming frequencies 0, should be 766
  # i_11 = PHI <1(4)>;
<L3>:;

  # i_1 = PHI <1(5), i_30(6)>;
<L11>:;
  D.828_13 = i_1 + -1;
  D.820_15 = (*a_14)[D.828_13];
  tmp_16 = __builtin_pow (D.820_15,
3.33333333333333314829616256247390992939472198486e-1);
  tmp2_17 = __builtin_pow (tmp_16, 2.0e+0);
  tmp4_18 = __builtin_pow (tmp2_17, 2.0e+0);
  D.829_22 = (*b_21)[D.828_13];
  D.830_23 = D.829_22 + tmp4_18;
  (*b_21)[D.828_13] = D.830_23;
  D.831_27 = (*c_26)[D.828_13];
  D.832_28 = D.831_27 + tmp2_17;
  (*c_26)[D.828_13] = D.832_28;
  i_30 = i_1 + 1;
  if (i_1 == D.824_4) goto <L7>; else goto <L11>;

Invalid sum of incoming frequencies 866, should be 1000
<L7>:;
  return;

<L16>:;
  goto <bb 7> (<L7>);

------------------------------------------------------
in .t49.copyrename2:
<bb 2>:
  D.824_4 = *n_3;
  if (D.824_4 <= 0) goto L.4; else goto <L1>;

  # S.7_5 = PHI <S.7_32(3), 1(2)>;
<L1>:;
  D.826_31 = S.7_5 + -1;
  (*c_26)[D.826_31] = 0.0;
  S.7_32 = S.7_5 + 1;
  if (D.824_4 < S.7_32) goto L.4; else goto <L1>;

L.4:;
  if (D.824_4 > 0) goto <L3>; else goto <L7>;

  # i_11 = PHI <1(4)>;
<L3>:;

  # i_1 = PHI <i_11(5), i_30(6)>;
<L11>:;
  D.828_13 = i_1 + -1;
  D.820_15 = (*a_14)[D.828_13];
  tmp_16 = __builtin_pow (D.820_15,
3.33333333333333314829616256247390992939472198486e-1);
  tmp2_17 = __builtin_pow (tmp_16, 2.0e+0);
  tmp4_18 = __builtin_pow (tmp2_17, 2.0e+0);
  D.829_22 = (*b_21)[D.828_13];
  D.830_23 = D.829_22 + tmp4_18;
  (*b_21)[D.828_13] = D.830_23;
  D.831_27 = (*c_26)[D.828_13];
  D.832_28 = D.831_27 + tmp2_17;
  (*c_26)[D.828_13] = D.832_28;
  i_30 = i_1 + 1;
  if (i_1 == D.824_4) goto <L7>; else goto <L11>;

<L7>:;
  return;


-- 
           Summary: DOM messes up "incoming frequencies" for some BBs
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25623