[Bug middle-end/115495] [15 Regression] ICE in smallest_mode_for_size, at stor-layout.cc:356 during combine on RISC-V rv64gcv_zvl256b at -O3 since r15-1042-g68b0742a49d

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115495

Robin Dapp <rdapp at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|rtl-optimization            |middle-end

--- Comment #6 from Robin Dapp <rdapp at gcc dot gnu.org> ---
Finally looking into this one.  The fix is pretty simple and it's similar to
other occurrences of smallest_int_mode_for_size.
smallest_int_mode_for_size expects to find at least one mode equal to or larger
than the provided size but in some cases this fails - in particular when we
have full-vector-size structures like here.

Testing a patch.