[Bug middle-end/68785] [6 Regression] valgrind reports issues with folding on x86_64

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68785

David Binderman <dcb314 at hotmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |dcb314 at hotmail dot com

--- Comment #14 from David Binderman <dcb314 at hotmail dot com> ---
Interestingly, I ran the code in comment 8 through a valgrind version
of recent gcc trunk, with the compiler flag -O2, and got this:

./gcc.dg/pr68785.c
==49861== Invalid read of size 1
==49861==    at 0xD9CDDD: count_nonzero_bytes(tree_node*, unsigned long,
unsigned long, unsigned int*, bool*, bool*, bool*, vr_values const*,
ssa_name_limit_t&) (tree-ssa-strlen.c:4891)
==49861==    by 0xD9CF17: count_nonzero_bytes(tree_node*, unsigned long,
unsigned long, unsigned int*, bool*, bool*, bool*, vr_values const*,
ssa_name_limit_t&) (tree-ssa-strlen.c:4801)
==49861==    by 0xDA19EE: count_nonzero_bytes (tree-ssa-strlen.c:4920)
==49861==    by 0xDA19EE: handle_integral_assign(gimple_stmt_iterator*, bool*,
vr_values const*) (tree-ssa-strlen.c:5547)