[Bug target/105383] New: [11/12 Regression] ICE: in change_insns, at rtl-ssa/changes.cc:674 with -Os -fno-tree-dominator-opts -fno-tree-vrp -msseregparm -m32

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105383

            Bug ID: 105383
           Summary: [11/12 Regression] ICE: in change_insns, at
                    rtl-ssa/changes.cc:674 with -Os
                    -fno-tree-dominator-opts -fno-tree-vrp -msseregparm
                    -m32
           Product: gcc
           Version: 12.0
            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 52873
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52873&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -Os -fno-tree-dominator-opts -fno-tree-vrp
-msseregparm -m32 testcase.c 
during RTL pass: fwprop1
testcase.c: In function 'foo':
testcase.c:12:1: internal compiler error: in change_insns, at
rtl-ssa/changes.cc:674
   11 | }
      | ^
0xce7bdd
rtl_ssa::function_info::change_insns(array_slice<rtl_ssa::insn_change*>)
        /repo/gcc-trunk/gcc/rtl-ssa/changes.cc:674
0x2458417 rtl_ssa::function_info::change_insn(rtl_ssa::insn_change&)
        /repo/gcc-trunk/gcc/rtl-ssa/changes.cc:717
0x2306d68 try_fwprop_subst_pattern
        /repo/gcc-trunk/gcc/fwprop.cc:553
0x2306d68 try_fwprop_subst
        /repo/gcc-trunk/gcc/fwprop.cc:627
0x230748c forward_propagate_and_simplify
        /repo/gcc-trunk/gcc/fwprop.cc:823
0x230748c forward_propagate_into
        /repo/gcc-trunk/gcc/fwprop.cc:886
0x230773b forward_propagate_into
        /repo/gcc-trunk/gcc/fwprop.cc:835
0x230773b fwprop_insn
        /repo/gcc-trunk/gcc/fwprop.cc:943
0x2307819 fwprop
        /repo/gcc-trunk/gcc/fwprop.cc:995
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-r12-8242-20220425114659-gf0e170f72f8-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.1/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-r12-8242-20220425114659-gf0e170f72f8-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.1 20220425 (experimental) (GCC)