[Bug middle-end/121530] [16 Regression] GNAT build fails on powrpc64le-linux-gnu with RTL assertion failure

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121530

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot gnu.org
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2025-08-13
          Component|ada                         |middle-end
            Summary|[16 Regression] ada build   |[16 Regression] GNAT build
                   |fails on                    |fails on
                   |powrpc64le-linux-gnu (ICE   |powrpc64le-linux-gnu with
                   |in gen_rtx_SUBREG, at       |RTL assertion failure
                   |emit-rtl.cc:1048)           |

--- Comment #1 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
This is an assertion failure in the RTL middle-end:

   gcc_assert (validate_subreg (mode, GET_MODE (reg), reg, offset));