[Bug tree-optimization/93079] New: ICE in mark_operand_necessary

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93079

            Bug ID: 93079
           Summary: ICE in mark_operand_necessary
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hubicka at gcc dot gnu.org
  Target Milestone: ---

Created attachment 47553
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47553&action=edit
unreduced testcase

$ ./xgcc -B ./ -O2 ~/aa.ii 
In file included from ../../include/llvm/Option/ArgList.h:12,
                 from ../../tools/clang/include/clang/Driver/Types.h:14,
                 from ../../tools/clang/include/clang/Driver/Action.h:13,
                 from
/aux/hubicka/llvm/tools/clang/lib/Driver/ToolChains/Cuda.h:13,
                 from
/aux/hubicka/llvm/tools/clang/lib/Driver/ToolChains/Gnu.h:12,
                 from
/aux/hubicka/llvm/tools/clang/lib/Driver/ToolChains/Gnu.cpp:9:
../../include/llvm/ADT/ArrayRef.h: In instantiation of
‘llvm::ArrayRef<T>::ArrayRef(const std::initializer_list<_Tp>&) [with T =
clang::driver::Multilib]’:
/aux/hubicka/llvm/tools/clang/lib/Driver/ToolChains/Gnu.cpp:1258:64:   required
from here
../../include/llvm/ADT/ArrayRef.h:101:37: warning: initializing
‘llvm::ArrayRef<clang::driver::Multilib>::Data’ from
‘std::initializer_list<clang::driver::Multilib>::begin’ does not extend the
lifetime of the underlying array [-Winit-list-lifetime]
during GIMPLE pass: cddce
/aux/hubicka/llvm/tools/clang/lib/Driver/ToolChains/Gnu.cpp: In member function
‘void
clang::driver::toolchains::Generic_GCC::GCCInstallationDetector::ScanLibDirForGCCTriple(const
llvm::Triple&, const llvm::opt::ArgList&, const string&, llvm::StringRef,
bool)’:
/aux/hubicka/llvm/tools/clang/lib/Driver/ToolChains/Gnu.cpp:2734:1: internal
compiler error: Segmentation fault
 2734 | }
      | ^
0x12c9ff8 crash_signal
        ../../gcc/toplev.c:328
0x7ffff756505f ???
       
/build/glibc-77giwP/glibc-2.24/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0x143fab6 mark_operand_necessary
        ../../gcc/tree-ssa-dce.c:188
0x1440f93 propagate_necessity
        ../../gcc/tree-ssa-dce.c:843
0x14430c9 perform_tree_ssa_dce
        ../../gcc/tree-ssa-dce.c:1663
0x144320a tree_ssa_cd_dce
        ../../gcc/tree-ssa-dce.c:1707
0x1443374 execute
        ../../gcc/tree-ssa-dce.c:1772
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