[Bug middle-end/127761] New: when initialization a large range with a designator, a loop should be created

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127761

            Bug ID: 127761
           Summary: when initialization a large range with a designator, a
                    loop should be created
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: uecker at gcc dot gnu.org
  Target Milestone: ---

In the following example, GCC creates a memset and 5000 mov instructions.


void b(const void*);

void a() 
{
   const int x[10000] = { [0 ... 5000] = 2 };
   b(&x);
}

https://godbolt.org/z/PGT6j8Mc7