[Bug target/95912] New: internal compiler error: in execute, at adjust-alignment.c:74 with 'ICE on '-m32 -mpreferred-stack-boundary=2''

[slyfox at inbox dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95912

            Bug ID: 95912
           Summary: internal compiler error: in execute, at
                    adjust-alignment.c:74 with 'ICE on '-m32
                    -mpreferred-stack-boundary=2''
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: slyfox at inbox dot ru
  Target Milestone: ---

Originally ICE happened when I attempted to compile valgrind-3.16.1.

Minimal reproducer is very simple:

$ cat bug.c
a() { long long b; }

$ LANG=C gcc-11.0.0 a.c -c -m32 -mpreferred-stack-boundary=2
bug.c:1:1: warning: return type defaults to 'int' [-Wimplicit-int]
    1 | a() { long long b; }
      | ^
during GIMPLE pass: adjust_alignment
bug.c: In function 'a':
bug.c:1:1: internal compiler error: in execute, at adjust-alignment.c:74
0x7f9fcda79d49 __libc_start_main
        ../csu/libc-start.c:308
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.

GCC was configured as:

$ /home/slyfox/dev/git/gcc-native-quick/gcc/xgcc
-B/home/slyfox/dev/git/gcc-native-quick/gcc -v
Reading specs from /home/slyfox/dev/git/gcc-native-quick/gcc/specs
COLLECT_GCC=/home/slyfox/dev/git/gcc-native-quick/gcc/xgcc
COLLECT_LTO_WRAPPER=/home/slyfox/dev/git/gcc-native-quick/gcc/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--enable-languages=c,c++ --disable-bootstrap --with-multilib-list=m64
--prefix=/home/slyfox/dev/git/gcc-native-quick/../gcc-native-quick-installed
--disable-nls --without-isl --disable-libsanitizer --disable-libvtv
--disable-libgomp --disable-libstdcxx-pch --disable-libunwind-exceptions
CFLAGS='-O1 ' CXXFLAGS='-O1 ' --with-sysroot=/usr/x86_64-HEAD-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.0.0 20200626 (experimental) (GCC)