[Bug rtl-optimization/111822] New: [12/13/14 Regression] during RTL pass: lr_shrinkage ICE: in operator[], at vec.h:910 with -O2 -m32 -flive-range-shrinkage -fno-dce -fnon-call-exceptions

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111822

            Bug ID: 111822
           Summary: [12/13/14 Regression] during RTL pass: lr_shrinkage
                    ICE: in operator[], at vec.h:910 with -O2 -m32
                    -flive-range-shrinkage -fno-dce -fnon-call-exceptions
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          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 56115
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56115&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 -m32 -flive-range-shrinkage -fno-dce
-fnon-call-exceptions testcase.C 
during RTL pass: lr_shrinkage
testcase.C: In member function 'void SQVM::CallNative()':
testcase.C:41:1: internal compiler error: in operator[], at vec.h:910
   41 | }
      | ^
0x7f615a vec<edge_def*, va_gc, vl_embed>::operator[](unsigned int)
        /repo/gcc-trunk/gcc/vec.h:910
0x7f63db vec<basic_block_def*, va_gc, vl_embed>::operator[](unsigned int)
        /repo/gcc-trunk/gcc/vec.h:936
0x7f63db pre_and_rev_post_order_compute_fn(function*, int*, int*, bool)
        /repo/gcc-trunk/gcc/cfganal.cc:1066
0x123b947 pre_and_rev_post_order_compute(int*, int*, bool)
        /repo/gcc-trunk/gcc/cfganal.cc:1079
0x1203292 init_alias_analysis()
        /repo/gcc-trunk/gcc/alias.cc:3429
0x285e960 sched_init()
        /repo/gcc-trunk/gcc/haifa-sched.cc:7331
0x286030d haifa_sched_init()
        /repo/gcc-trunk/gcc/haifa-sched.cc:7368
0x174ff5c schedule_insns()
        /repo/gcc-trunk/gcc/sched-rgn.cc:3524
0x175063b schedule_insns()
        /repo/gcc-trunk/gcc/sched-rgn.cc:3518
0x175063b rest_of_handle_live_range_shrinkage
        /repo/gcc-trunk/gcc/sched-rgn.cc:3720
0x175063b execute
        /repo/gcc-trunk/gcc/sched-rgn.cc:3807
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-r14-4642-20231015125226-g77faa3e198a-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-r14-4642-20231015125226-g77faa3e198a-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20231015 (experimental) (GCC)