[Bug tree-optimization/63278] Fails to compute loop bound from constant string

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63278

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yes, the testcase for "fails to compute loop bound" (and unroll) wasn't
supposed
to use 'constexpr'.  Unrolling should work without that, too ;)