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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/98393] New: new valgrind error for ./gcc.target/m68k/pr52573.c
Date: Sat, 19 Dec 2020 17:31:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98393

            Bug ID: 98393
           Summary: new valgrind error for ./gcc.target/m68k/pr52573.c
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

A valgrind version of gcc trunk dated 20201206, with hash 8c23434fdadcf4ca,
compiles testsuite file ./gcc.target/m68k/pr52573.c fine with compiler flag=
 -O3
on x86_64.

A week later, gcc trunk dated 20201211, with hash 97b56dece7413839, does th=
is:

=3D=3D11710=3D=3D Conditional jump or move depends on uninitialised value(s)
=3D=3D11710=3D=3D    at 0xE9DC54: vect_build_slp_instance(vec_info*, slp_in=
stance_kind,
vec<_stmt_vec_info*, va_heap, vl_p
tr>&, _stmt_vec_info*, unsigned int, unsigned int*, hash_map<vec<gimple*,
va_heap, vl_ptr>, _slp_tree*, simple_has
hmap_traits<bst_traits, _slp_tree*> >*, _stmt_vec_info*) (tree-vect-slp.c:2=
396)

The problem remains a week later in gcc trunk dated 20201218.

I will have a look with git bisect.=