[Bug target/127256] libjxl build ICEs in simplify_gen_subreg_concatn, at lower-subreg.cc:744

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127256

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 65524
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65524&action=edit
reduced testcase

reduced testcase