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

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

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

Drea Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=92714,
                   |                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=59863,
                   |                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=70189,
                   |                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=105343
           Keywords|                            |compile-time-hog,
                   |                            |missed-optimization
           Severity|normal                      |enhancement

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.  

The front-end produces (for [0 ... 55] = ):
    const int x[10000] = {2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2};


Note maybe RANGE_EXPR should be used here instead which would help.

But then the gimplifier decides to expand out that constructor.