[Bug rtl-optimization/70263] [4.9/5/6 Regression] ICE at -O1 and above in both 32-bit and 64-bit modes on x86_64-linux-gnu (segmentation fault)

["mpolacek at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70263

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |law at gcc dot gnu.org,
                   |                            |mpolacek at gcc dot gnu.org

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r203895:

commit 4bc0f16ebd21b15d624ebbf8efa88c9c2f1df367
Author: law <law@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Mon Oct 21 15:25:09 2013 +0000

           * tree-ssa-threadedge.c (thread_through_normal_block): New argument
VISITED.
            Remove VISISTED as a local variable.  When we have a threadable
jump, verify
            the destination of the jump has not been visised.
            (thread_across_edge): Allocate VISITED bitmap once at function
scope and
            use it throughout.  Make sure to set appropriate bits in VISITED
for E (start
            of jump thread path).

            * tree-ssa-threadupdate.c (mark_threaded_blocks): Reject threading
through
            a joiner if any edge on the path has a recorded jump thread.