[Bug ada/109881] New: GNAT BUG DETECTED during RTL pass, raised TYPES.UNRECOVERABLE_ERROR

["gnugcc at marino dot st" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109881

            Bug ID: 109881
           Summary: GNAT BUG DETECTED during RTL pass, raised
                    TYPES.UNRECOVERABLE_ERROR
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ada
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gnugcc at marino dot st
                CC: dkm at gcc dot gnu.org
  Target Milestone: ---

Created attachment 55096
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55096&action=edit
The three ada source files requested in the GNAT BUG message

During development, I hit this error on GCC 11.2.0 and also got a very similar
one on Community 2020 (Windows).  It just happened so if a future change
resolves it, I'll reattach those source files.  


during RTL pass: expand
+===========================GNAT BUG DETECTED==============================+
| 11.2.0 (x86_64-raven-dragonfly6.2) GCC error:                            |
| in operand_subword_force, at emit-rtl.c:1806                             |
| Error detected around
/home/marino/rvn-format/src/zstandard/zstandard-streaming_decompression.adb:249:8|
| Please submit a bug report; see https://gcc.gnu.org/bugs/ .              |
| Use a subject line meaningful to you and us to track the bug.            |
| Include the entire contents of this bug box in the report.               |
| Include the exact command that you entered.                              |
| Also include sources listed below.                                       |
+==========================================================================+

Please include these source files with error report
Note that list may not be accurate in some cases,
so please double check that the problem can still
be reproduced with the set of files listed.
Consider also -gnatd.n switch (see debug.adb).

/home/marino/rvn-format/src/zstandard/zstandard-streaming_decompression.adb
zstandard/zstandard-streaming_decompression.ads
zstandard/zstandard.ads

raised TYPES.UNRECOVERABLE_ERROR : comperr.adb:407

commands that built it:
gcc -c unix/stat_opsc.c -o stat_opsc.o

PROG=/raven/share/raven/toolchain/ravensys-gcc/bin/gnatmake
${PROG} unrvn.adb -Izstandard -Iblake3 -Iunix -lzstd -largs -L/raven/lib
-lzstd_pic -lblake3_pic stat_opsc.o