[Bug target/113133] New: [14 Regression] ICE: SIGSEGV in mark_label_nuses(rtx_def*) (emit-rtl.cc:3896) with -O -fno-tree-ter -mavx512f -march=barcelona

["zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113133

            Bug ID: 113133
           Summary: [14 Regression] ICE: SIGSEGV in
                    mark_label_nuses(rtx_def*) (emit-rtl.cc:3896) with -O
                    -fno-tree-ter -mavx512f -march=barcelona
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 56931
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56931&action=edit
reduced testcase

I am observing these kind of SEGSEGV, -O -fno-tree-ter -mavx512f -march="some
older amd64" seems to be the common set of flags. Up to try_split() seems to be
the common backtrace.

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O -fno-tree-ter -mavx512f -march=barcelona
testcase.c -wrapper valgrind,-q
==3147== Invalid read of size 1
==3147==    at 0x1079841: mark_label_nuses(rtx_def*) (emit-rtl.cc:3896)
==3147==    by 0x10798C4: mark_label_nuses(rtx_def*) (emit-rtl.cc:3904)
==3147==    by 0x10798C4: mark_label_nuses(rtx_def*) (emit-rtl.cc:3904)
==3147==    by 0x10798C4: mark_label_nuses(rtx_def*) (emit-rtl.cc:3904)
==3147==    by 0x108057A: try_split(rtx_def*, rtx_insn*, int)
(emit-rtl.cc:4093)
==3147==    by 0x144AB28: split_insn(rtx_insn*) (recog.cc:3405)
==3147==    by 0x14519C5: split_all_insns() (recog.cc:3509)
==3147==    by 0x1451AE8: (anonymous
namespace)::pass_split_all_insns::execute(function*) (recog.cc:4433)
==3147==    by 0x13C9A6A: execute_one_pass(opt_pass*) (passes.cc:2646)
==3147==    by 0x13CA35F: execute_pass_list_1(opt_pass*) (passes.cc:2755)
==3147==    by 0x13CA371: execute_pass_list_1(opt_pass*) (passes.cc:2756)
==3147==    by 0x13CA371: execute_pass_list_1(opt_pass*) (passes.cc:2756)
==3147==  Address 0x2 is not stack'd, malloc'd or (recently) free'd
==3147== 
during RTL pass: split2
testcase.c: In function 'foo0':
testcase.c:68:1: internal compiler error: Segmentation fault
   68 | }
      | ^
0x150b4af crash_signal
        /repo/gcc-trunk/gcc/toplev.cc:316
0x1079841 mark_label_nuses
        /repo/gcc-trunk/gcc/emit-rtl.cc:3896
0x10798c4 mark_label_nuses
        /repo/gcc-trunk/gcc/emit-rtl.cc:3904
0x10798c4 mark_label_nuses
        /repo/gcc-trunk/gcc/emit-rtl.cc:3904
0x10798c4 mark_label_nuses
        /repo/gcc-trunk/gcc/emit-rtl.cc:3904
0x108057a try_split(rtx_def*, rtx_insn*, int)
        /repo/gcc-trunk/gcc/emit-rtl.cc:4093
0x144ab28 split_insn
        /repo/gcc-trunk/gcc/recog.cc:3405
0x14519c5 split_all_insns()
        /repo/gcc-trunk/gcc/recog.cc:3509
0x1451ae8 execute
        /repo/gcc-trunk/gcc/recog.cc:4433
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r14-6825-20231224193009-ga657c7e3518-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r14-6825-20231224193009-ga657c7e3518-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20231224 (experimental) (GCC)