[Bug c/106972] New: internal compiler error: in extract_insn, at recog.c:2770 on ARMeb when building gcc itself

["thomas.petazzoni@free-electrons.com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106972

            Bug ID: 106972
           Summary: internal compiler error: in extract_insn, at
                    recog.c:2770 on ARMeb when building gcc itself
           Product: gcc
           Version: 11.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: thomas.petazzoni@free-electrons.com
  Target Milestone: ---

When building gcc 11.3.0 for armeb, with the following configure command line:


(cd
/home/thomas/autobuild/instance-1/output-1/build/host-gcc-initial-11.3.0/build
&& rm -rf config.cache;
PATH="/home/thomas/autobuild/instance-1/output-1/host/bin:/home/thomas/autobuild/instance-1/output-1/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"
PKG_CONFIG="/home/thomas/autobuild/instance-1/output-1/host/bin/pkg-config"
PKG_CONFIG_SYSROOT_DIR="/" PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1
PKG_CONFIG_ALLOW_SYSTEM_LIBS=1
PKG_CONFIG_LIBDIR="/home/thomas/autobuild/instance-1/output-1/host/lib/pkgconfig:/home/thomas/autobuild/instance-1/output-1/host/share/pkgconfig"
AR="/usr/bin/ar" AS="/usr/bin/as" LD="/usr/bin/ld" NM="/usr/bin/nm"
CC="/usr/bin/gcc" GCC="/usr/bin/gcc" CXX="/usr/bin/g++" CPP="/usr/bin/cpp"
OBJCOPY="/usr/bin/objcopy" RANLIB="/usr/bin/ranlib"
CPPFLAGS="-I/home/thomas/autobuild/instance-1/output-1/host/include"
CFLAGS="-O2 -I/home/thomas/autobuild/instance-1/output-1/host/include"
CXXFLAGS="-O2 -I/home/thomas/autobuild/instance-1/output-1/host/include"
LDFLAGS="-L/home/thomas/autobuild/instance-1/output-1/host/lib
-Wl,-rpath,/home/thomas/autobuild/instance-1/output-1/host/lib"
INTLTOOL_PERL=/usr/bin/perl CFLAGS="-O2
-I/home/thomas/autobuild/instance-1/output-1/host/include"
LDFLAGS="-L/home/thomas/autobuild/instance-1/output-1/host/lib
-Wl,-rpath,/home/thomas/autobuild/instance-1/output-1/host/lib"
MAKEINFO=missing CFLAGS_FOR_TARGET="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64  -Os -g0 -D_FORTIFY_SOURCE=1"
CXXFLAGS_FOR_TARGET="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64  -Os -g0 -D_FORTIFY_SOURCE=1" AR_FOR_TARGET=gcc-ar
NM_FOR_TARGET=gcc-nm RANLIB_FOR_TARGET=gcc-ranlib CONFIG_SITE=/dev/null
./configure --prefix="/home/thomas/autobuild/instance-1/output-1/host"
--sysconfdir="/home/thomas/autobuild/instance-1/output-1/host/etc"
--localstatedir="/home/thomas/autobuild/instance-1/output-1/host/var"
--enable-shared --disable-static --disable-gtk-doc --disable-gtk-doc-html
--disable-doc --disable-docs --disable-documentation --disable-debug
--with-xmlto=no --with-fop=no --disable-nls --disable-dependency-tracking 
--target=armeb-buildroot-linux-gnueabi
--with-sysroot=/home/thomas/autobuild/instance-1/output-1/host/armeb-buildroot-linux-gnueabi/sysroot
--enable-__cxa_atexit --with-gnu-ld --disable-libssp --disable-multilib
--disable-decimal-float --enable-plugins --enable-lto
--with-gmp=/home/thomas/autobuild/instance-1/output-1/host
--with-mpc=/home/thomas/autobuild/instance-1/output-1/host
--with-mpfr=/home/thomas/autobuild/instance-1/output-1/host
--with-pkgversion="Buildroot 2022.08-rc1-468-g0f42b81532"
--with-bugurl="http://bugs.buildroot.net/" --without-zstd --disable-libquadmath
--disable-libquadmath-support --enable-tls --enable-threads --without-isl
--without-cloog --with-float=soft --with-abi="aapcs-linux" --with-cpu=iwmmxt
--with-float=soft --with-mode=arm --enable-languages=c --disable-shared
--without-headers --disable-threads --with-newlib --disable-largefile  )

The build fails with:

../../../libgcc/config/arm/unwind-arm.c:467:1: error: unrecognizable insn:
  467 | }
      | ^
(insn 2 4 3 2 (set (reg/v/f:SI 118 [ p ])
        (reg:SI 0 r0 [ p ])) "../../../libgcc/config/arm/unwind-arm.c":456:1 -1
     (nil))
during RTL pass: vregs
../../../libgcc/config/arm/unwind-arm.c:467:1: internal compiler error: in
extract_insn, at recog.c:2770

(The same error happens in several place)

Full build log at
http://autobuild.buildroot.net/results/8e4c4512902c34d8ec0c6f8dfff92b7a198e4b4a/build-end.log

There are a number of similar reports, but they don't seem to apply:
- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99724 is already fixed in gcc
11.3.0
- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102222 is S390 specific