[Bug tree-optimization/83142] New: Missed tail-call opportunity

rguenth at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Fri Nov 24 12:47:00 GMT 2017


            Bug ID: 83142
           Summary: Missed tail-call opportunity
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

The following is not tail-called even though memmove returns dest (and the
compiler knows that):

struct A { int i; int j; int k; };
void *bar (struct A *dest, struct A *src)
  __builtin_memmove (dest, src, sizeof (struct A));
  return dest;

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