[Bug tree-optimization/101541] New: Missing ABSU detection at gimple

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101541

            Bug ID: 101541
           Summary: Missing ABSU detection at gimple
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

While looking at PR 44608 and finding it was already fixed, I noticed instead
we should produce ABSU at the gimple level but don't currently.

Take:
unsigned abssat2 (int x)
{
    unsigned int y = x;

    if (x < 0)
        y = -y;

  return y;
}