[Bug tree-optimization/103245] New: Failure to detect abs pattern using multiplication with slightly different casts for unsigned case

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103245

            Bug ID: 103245
           Summary: Failure to detect abs pattern using multiplication
                    with slightly different casts for unsigned case
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
            Blocks: 103228
  Target Milestone: ---

While working on PR 103228, I got the testcase for PR 94785 failing.
It fails if I change the casts even:
unsigned int f4 (int v)
{
  unsigned int d_6;
  int b_5;
  int a_4;
  _Bool _1;
  unsigned int v1_2;
  unsigned int _7;
  int _9;

  _1 = v < 0;
  a_4 = (int) _1;
  b_5 = -a_4;
  _9 = b_5 | 1;
  d_6 = (unsigned int) _9;
  v1_2 = (unsigned int) v;
  _7 = v1_2 * d_6;
  return _7;
}
---- CUT ---


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103228
[Bug 103228] [9/10/11/12 Regression] missed optimization with |^ at the gimple
level