[Bug c/57584] New: ice: SSA corruption: Unable to coalesce ssa_names

["dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57584

            Bug ID: 57584
           Summary: ice: SSA corruption: Unable to coalesce ssa_names
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com

Created attachment 30289
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30289&action=edit
gzipped C source code

The attached source code causes the following crash
on gcc-4.9 trunk dated 20130605 on an AMD x86_64 box
when compiled with -O3.

Unable to coalesce ssa_names 45 and 3671 which are marked as MUST COALESCE.
sp_45(ab) and  sp_3671(ab)
In file included from vm.c:661:0:
vm-engine.c: In function ‘vm_debug_engine’:
vm-engine.c:39:1: internal compiler error: SSA corruption
0x9ca5bf fail_abnormal_edge_coalesce
    ../../src/trunk/gcc/tree-ssa-coalesce.c:898
0x9ca5bf coalesce_partitions
    ../../src/trunk/gcc/tree-ssa-coalesce.c:1200
0x9ca5bf coalesce_ssa_name()
    ../../src/trunk/gcc/tree-ssa-coalesce.c:1337
0x981cee remove_ssa_form
    ../../src/trunk/gcc/tree-outof-ssa.c:900
0x981cee rewrite_out_of_ssa(ssaexpand*)
    ../../src/trunk/gcc/tree-outof-ssa.c:1133
0x60c694 gimple_expand_cfg
    ../../src/trunk/gcc/cfgexpand.c:4541
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/30604] Unable to coalesce ssa_names <x>  and <y>  which are marked as MUST COALESCE
Date: Tue, 11 Jun 2013 10:09:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id0604

--- Comment #17 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to rguenther@suse.de from comment #16)
> Can you open a new bugreport please?  It's very likely a different
> reason than this one.

After a lot of fiddling about, please see #57584

Redhat package guile went to a lot of work to hide
the compiler command line ;-|