[Bug tree-optimization/92980] [miss optimization]redundant load missed by fre.

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92980

--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
test.c.033.fre1
foo (unsigned int * restrict src1, int i, int k, int n)
{
  int sum;
  int j;
  long unsigned int _1;
  long unsigned int _2;
  unsigned int * _3;
  unsigned int _4;
  sizetype _7;
  unsigned int * _8;
  unsigned int _9;
  unsigned int _11;
  long unsigned int _12;
  long unsigned int _13;
  sizetype _14;
  unsigned int * _15;
  unsigned int _16;
  unsigned int _18;
  int _31;

  <bb 2> :
  j_23 = k_21(D) + n_22(D);
  _1 = (long unsigned int) j_23;
  _2 = _1 * 4;
  _3 = src1_24(D) + _2;
  _4 = *_3;
  sum_26 = (int) _4;
  _7 = _2 + 18446744073709551612;
  _8 = src1_24(D) + _7;
  _9 = *_8;
  _11 = _4 + _9;
  sum_27 = (int) _11;
  if (k_21(D) >= i_28(D))
    goto <bb 3>; [INV]
  else
    goto <bb 4>; [INV]

  <bb 3> :
  j_29 = j_23 + 2;
  _12 = (long unsigned int) j_29;
  _13 = _12 * 4;
  _14 = _13 + 18446744073709551604; --- it shoule be simplified to _7
  _15 = src1_24(D) + _14;
  _16 = *_15;
  _18 = _11 + _16;
  sum_30 = (int) _18;

  <bb 4> :
  # j_19 = PHI <j_23(2), j_29(3)>
  # sum_20 = PHI <sum_27(2), sum_30(3)>
  _31 = j_19 + sum_20;
  return _31;
}