[Bug target/114232] New: [14 regression] ICE when building rr-5.7.0 with LTO on x86

["sjames at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114232

            Bug ID: 114232
           Summary: [14 regression] ICE when building rr-5.7.0 with LTO on
                    x86
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sjames at gcc dot gnu.org
  Target Milestone: ---

Created attachment 57608
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57608&action=edit
RecordSession.cc.ii.xz

Hit this when building rr-5.7.0 with LTO on x86.

```
$ cat list.txt

RecordSession.cc.ii
Task.cc.ii
TraceStream.cc.ii

$ g++ -O3 -pipe -march=i686 -mfpmath=sse -msse -msse2 -fno-vect-cost-model
-rdynamic -flto=auto @list.txt
/var/tmp/portage/dev-util/rr-5.7.0/work/rr-5.7.0/src/TraceStream.cc: In member
function ‘close’:
/var/tmp/portage/dev-util/rr-5.7.0/work/rr-5.7.0/src/TraceStream.cc:1467:1:
error: unrecognizable insn:
 1467 | }
      | ^
(insn 160 159 161 26 (parallel [
            (set (reg:V2QI 250 [ vect_patt_207.470_183 ])
                (minus:V2QI (reg:V2QI 251)
                    (reg:V2QI 249 [ vect__4.468_451 ])))
            (clobber (reg:CC 17 flags))
        ])
"/var/tmp/portage/dev-util/rr-5.7.0/work/rr-5.7.0/src/TraceStream.cc":254:16 -1
     (nil))
during RTL pass: vregs
/var/tmp/portage/dev-util/rr-5.7.0/work/rr-5.7.0/src/TraceStream.cc:1467:1:
internal compiler error: in extract_insn, at recog.cc:2812
0x5799263a _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
       
/usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/rtl-error.cc:108
0x579927e8 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
       
/usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/rtl-error.cc:116
0x56eadade extract_insn(rtx_insn*)
        /usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/recog.cc:2812
0x58ac1379 instantiate_virtual_regs_in_insn
       
/usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/function.cc:1611
0x58ac1379 instantiate_virtual_regs
       
/usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/function.cc:1994
0x58ac1379 execute
       
/usr/src/debug/sys-devel/gcc-14.0.9999/gcc-14.0.9999/gcc/function.cc:2041
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://bugs.gentoo.org/> for instructions.
make: *** [/tmp/ccCI1g9e.mk:17: /tmp/ccZVEvZf.ltrans5.ltrans.o] Error 1
lto-wrapper: fatal error: make returned 2 exit status
compilation terminated.
/usr/lib/gcc/i686-pc-linux-gnu/14/../../../../i686-pc-linux-gnu/bin/ld: error:
lto-wrapper failed
collect2: error: ld returned 1 exit status
```

```
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-pc-linux-gnu/14/lto-wrapper
Target: i686-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-14.0.9999/work/gcc-14.0.9999/configure
--host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --prefix=/usr
--bindir=/usr/i686-pc-linux-gnu/gcc-bin/14
--includedir=/usr/lib/gcc/i686-pc-linux-gnu/14/include
--datadir=/usr/share/gcc-data/i686-pc-linux-gnu/14
--mandir=/usr/share/gcc-data/i686-pc-linux-gnu/14/man
--infodir=/usr/share/gcc-data/i686-pc-linux-gnu/14/info
--with-gxx-include-dir=/usr/lib/gcc/i686-pc-linux-gnu/14/include/g++-v14
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/i686-pc-linux-gnu/14/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--disable-libunwind-exceptions --enable-checking=yes,extra,rtl,df
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 14.0.9999 p,
commit c8305c9bdf09abe3e2f89783fe62f2e4049468fa' --with-gcc-major-version-only
--enable-libstdcxx-time --enable-lto --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--disable-multilib --disable-fixed-point --with-arch=i686 --enable-targets=all
--enable-libgomp --disable-libssp --disable-libada --disable-cet
--disable-systemtap --enable-valgrind-annotations --disable-vtable-verify
--disable-libvtv --with-zstd --without-isl --enable-default-pie
--enable-host-pie --disable-host-bind-now --enable-default-ssp
--disable-fixincludes --with-build-config='bootstrap-O3 bootstrap-lto'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.1 20240304 (experimental)
a89c5df317d1de74871e2a05c36aed9cbbb21f42 (Gentoo 14.0.9999 p, commit
c8305c9bdf09abe3e2f89783fe62f2e4049468fa)
```