This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug tree-optimization/71031] [6/7 Regression] ICE in extract_range_from_binary_expr_1, at tree-vrp.c:2535 w/ -Os
- From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 18 May 2016 17:20:03 +0000
- Subject: [Bug tree-optimization/71031] [6/7 Regression] ICE in extract_range_from_binary_expr_1, at tree-vrp.c:2535 w/ -Os
- Auto-submitted: auto-generated
- References: <bug-71031-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71031
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
To expand a bit on Comment 4: we have [1, od_5] + UINT_MAX on type unsigned and
are in extract_range_from_binary_expr_1. We combine the lower bounds, which is
1 + UINT_MAX = 0(OVF). We then combine the upper bounds, because the max_op0
is not a constant, the result of that is UINT_MAX. So WMIN is 0(OVF) and WMAX
is UINT_MAX. These are equal to TYPE_MIN and TYPE_MAX, respectively. What to
do with that, drop to VR_VARYING if we have min overflow or max underflow?
Richi/Jakub, any ideas? I'm kinda stuck here :(.