[Bug 1719710] Re: gcc-7 7.2.0-7ubuntu1 ICE on i386 (llvm-toolchain-3.8)

[LocutusOfBorg]

** Bug watch added: GCC Bugzilla #82330
   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82330

** Also affects: gcc via
   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82330
   Importance: Unknown
       Status: Unknown

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Title:
  gcc-7 7.2.0-7ubuntu1 ICE on i386 (llvm-toolchain-3.8)

Status in gcc:
  Unknown
Status in gcc-7 package in Ubuntu:
  Confirmed

Bug description:
  the previous 7.2.0-6ubuntu1 seems to build it just fine
  https://launchpadlibrarian.net/338774228/buildlog_ubuntu-artful-i386.llvm-toolchain-3.8_1%3A3.8.1-24ubuntu7ppa2_BUILDING.txt.gz

  while 7.2.0-7ubuntu1 ICE now
  /<<PKGBUILDDIR>>/lib/Transforms/InstCombine/InstCombineAddSub.cpp: In function ‘llvm::Value* {anonymous}::FAddCombine::simplify(llvm::Instruction*)’:
  /<<PKGBUILDDIR>>/lib/Transforms/InstCombine/InstCombineAddSub.cpp:518:8: internal compiler error: in equal_mem_array_ref_p, at tree-ssa-scopedtables.c:429
   Value *FAddCombine::simplify(Instruction *I) {
          ^~~~~~~~~~~
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.

  see:
  https://launchpadlibrarian.net/338562399/buildlog_ubuntu-artful-i386.llvm-toolchain-3.8_1%3A3.8.1-24ubuntu7_BUILDING.txt.gz

  Changelog:
  +  * Update to SVN 20170923 (r253114) from the gcc-7-branch.
  +    - Fix PR libstdc++/79162, PR libstdc++/79162, PR libstdc++/82262,
  +      PR libstdc++/82254, PR target/81996 (PPC), PR target/71951 (AArch64),
  +      PR sanitizer/81929.
  +  * Fix PR go/82284, taken from the trunk. Closes: #876353.

  
  full upstream Changelog:
  ++2017-09-21  Jonathan Wakely  <jwakely at redhat.com>
  ++
  ++      * testsuite/25_algorithms/clamp/1.cc: Fix order of arguments and
  ++      expected results when using predicate defining reverse order.
  ++      * testsuite/25_algorithms/clamp/constexpr.cc: Likewise.
  ++
  ++2017-09-20  Jonathan Wakely  <jwakely at redhat.com>
  ++
  ++      Backport from mainline
  ++      2017-06-14  Jonathan Wakely  <jwakely at redhat.com>
  ++
  ++      * doc/xml/manual/test.xml: Correct instructions on running tests.
  ++      * testsuite/27_io/basic_ios/copyfmt/char/1.cc: Adjust to pass when
  ++      -D_GLIBCXX_USE_CXX11_ABI=0 added to RUNTESTFLAGS.
  ++      * testsuite/27_io/basic_ios/exceptions/char/1.cc: Likewise.
  ++      * testsuite/27_io/basic_istream/extractors_arithmetic/char/
  ++      exceptions_failbit.cc: Likewise.
  ++      * testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/
  ++      exceptions_failbit.cc: Likewise.
  ++      * testsuite/27_io/basic_istream/extractors_other/char/
  ++      exceptions_null.cc: Likewise.
  ++      * testsuite/27_io/basic_istream/extractors_other/wchar_t/
  ++      exceptions_null.cc: Likewise.
  ++      * testsuite/27_io/basic_istream/sentry/char/12297.cc: Likewise.
  ++      * testsuite/27_io/basic_istream/sentry/wchar_t/12297.cc: Likewise.
  ++      * testsuite/27_io/basic_ostream/inserters_other/char/
  ++      exceptions_null.cc: Likewise.
  ++      * testsuite/27_io/basic_ostream/inserters_other/wchar_t/
  ++      exceptions_null.cc: Likewise.
  ++      * testsuite/27_io/ios_base/storage/2.cc: Likewise.
  ++
  ++      PR libstdc++/79162
  ++      * include/bits/basic_string.h [!_GLIBCXX_USE_CXX11_ABI]
  ++      (basic_string::_If_sv): Remove from the overload set when the
  ++      argument is derived from basic_string.
  ++
  ++      PR libstdc++/79162
  ++      * include/bits/basic_string.h (basic_string::_If_sv): Remove from the
  ++      overload set when the argument is derived from basic_string.
  ++      * testsuite/21_strings/basic_string/cons/char/moveable2_c++17.cc: New
  ++      test.
  ++      * testsuite/21_strings/basic_string/cons/wchar_t/moveable2_c++17.cc:
  ++      New test.
  ++
  ++      * testsuite/24_iterators/range_access_cpp17.cc: Fix order of dg-do
  ++      and dg-options directives. Fix invalid test.
  ++
  ++      Backport from mainline
  ++      2017-09-20  Jonathan Wakely  <jwakely at redhat.com>
  ++
  ++      PR libstdc++/82262
  ++      * include/std/optional (__optional_hash_call_base): Add template
  ++      parameter for remove_const_t<_Tp> and use it consistently.
  ++      * testsuite/20_util/optional/hash.cc: Test optional<const T>.
  ++
  ++      Backport from mainline
  ++      2017-09-19  Jonathan Wakely  <jwakely at redhat.com>
  ++
  ++      PR libstdc++/82254
  ++      * include/std/type_traits (__is_invocable): Add partial specialization
  ++      for INVOKE<void> case and remove is_void<R> check from partial
  ++      specialization for INVOKE<R> case.
  ++      (__is_nt_invocable_impl): New helper for is_nothrow_invocable_r.
  ++      (is_nothrow_invocable_r): Use __is_nt_invocable_impl.
  ++      * testsuite/20_util/is_nothrow_invocable/value.cc: Add tests for
  ++      conversions that can throw or fail to convert. Use static assert
  ++      strings to explain negative results.
  ++      * testsuite/20_util/is_nothrow_invocable/value_ext.cc: Use
  ++      is_nothrow_constructible in is_nt_invocable_conv.

  
  not sure what can cause such ICE; and I don't know how to debug it further

  Matthias do you have a clue?

  G.

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