[Bug ipa/93823] New: [10 Regression] ICE: in find_more_scalar_values_for_callers_subset, at ipa-cp.c:4709 due to -fipa-cp

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93823

            Bug ID: 93823
           Summary: [10 Regression] ICE: in
                    find_more_scalar_values_for_callers_subset, at
                    ipa-cp.c:4709 due to -fipa-cp
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu

Created attachment 47876
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47876&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O3 testcase.c -Wno-psabi
during IPA pass: cp
testcase.c:21:1: internal compiler error: in
find_more_scalar_values_for_callers_subset, at ipa-cp.c:4709
   21 | }
      | ^
0x998120 find_more_scalar_values_for_callers_subset
        /repo/gcc-trunk/gcc/ipa-cp.c:4709
0x1a0fc87 decide_about_value<tree_node*>
        /repo/gcc-trunk/gcc/ipa-cp.c:5490
0x1a1159c decide_whether_version_node
        /repo/gcc-trunk/gcc/ipa-cp.c:5537
0x1a1159c ipcp_decision_stage
        /repo/gcc-trunk/gcc/ipa-cp.c:5718
0x1a1159c ipcp_driver
        /repo/gcc-trunk/gcc/ipa-cp.c:5901
0x1a1159c execute
        /repo/gcc-trunk/gcc/ipa-cp.c:5992
Please submit a full bug report,
with preprocessed source if appropriate.
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-20200219091344-g8d1a1cb1b81-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/10.0.1/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
--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-20200219091344-g8d1a1cb1b81-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.0.1 20200219 (experimental) (GCC)