[Bug rtl-optimization/57320] New: Shrink-wrapping breaks graph dumping

[Bug rtl-optimization/57320] New: Shrink-wrapping breaks graph dumping

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57320

            Bug ID: 57320
           Summary: Shrink-wrapping breaks graph dumping
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: steven at gcc dot gnu.org

Compiling gcc.target/i386/pad-10.c with:

$ ./xgcc -B. -O2 -fomit-frame-pointer -march=atom pad-10.c \
 -fdump-rtl-pro_and_epilogue-graph

gives:

pad-10.c: In function 'foo2':
pad-10.c:19:1: internal compiler error: in pre_and_rev_post_order_compute, at
cfganal.c:869
 }
 ^
0x61dbaa pre_and_rev_post_order_compute(int*, int*, bool)
        ../../trunk/gcc/cfganal.c:869
0xd28d21 draw_cfg_nodes_no_loops
        ../../trunk/gcc/graph.c:183
0xd28d21 draw_cfg_nodes
        ../../trunk/gcc/graph.c:265
0xd28d21 print_graph_cfg(char const*, function*)
        ../../trunk/gcc/graph.c:306


This happens because shrink-wrapping leaves unreachable blocks
in the CFG.  For a more detailed analysis see:
http://gcc.gnu.org/ml/gcc-patches/2013-05/msg01016.html

[Bug rtl-optimization/57320] Shrink-wrapping leaves unreachable blocks in the CFG

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57320

Steven Bosscher <steven at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-05-17
                 CC|                            |bernds at gcc dot gnu.org
            Summary|Shrink-wrapping breaks      |Shrink-wrapping leaves
                   |graph dumping               |unreachable blocks in the
                   |                            |CFG
     Ever confirmed|0                           |1

--- Comment #1 from Steven Bosscher <steven at gcc dot gnu.org> ---
Adding Bernd to CC as author of the shrink-wrapping code

[Bug rtl-optimization/57320] [4.9 Regression] Shrink-wrapping leaves unreachable blocks in the CFG

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57320

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.9.0

[Bug rtl-optimization/57320] [4.9 Regression] Shrink-wrapping leaves unreachable blocks in the CFG

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57320

--- Comment #3 from Steven Bosscher <steven at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> This has been fixed by r204211 on the trunk, any reason to keep this PR open?

Eh, really? That commit is supposed to change nothing except
the graph dumper.

> Note that Steven's patch has been approved, but never committed:
> http://gcc.gnu.org/ml/gcc-patches/2013-05/msg01020.html

That patch is still necessary. I've simply forgotten about it.

I don't have access to a machine to commit it this or next week.  Much
appreciated if you could take care of it!

[Bug rtl-optimization/57320] [4.9 Regression] Shrink-wrapping leaves unreachable blocks in the CFG

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57320

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Should be fixed by Steven's patch.