[Bug middle-end/56490] [4.6/4.7/4.8 Regression] -Wall triggering infinite loop

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56490

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |compile-time-hog,
                   |                            |diagnostic
   Last reconfirmed|                            |2013-03-01
          Component|fortran                     |middle-end
                 CC|                            |davidxl at google dot com
     Ever Confirmed|0                           |1
            Summary|[4.6/4.7 Regression] -Wall  |[4.6/4.7/4.8 Regression]
                   |triggering infinite loop    |-Wall triggering infinite
                   |                            |loop
   Target Milestone|---                         |4.6.4

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2013-03-01 12:09:40 UTC ---
Confirmed.

#0  0x0000000000d43262 in find_pdom (block=0x7ffff6b43340)
    at /space/rguenther/src/svn/trunk/gcc/tree-ssa-uninit.c:170
#1  0x0000000000d4358a in compute_control_dep_chain (bb=0x7ffff6d32ea0, 
    dep_bb=0x7ffff6b4b820, cd_chains=0x1d67f20, num_chains=0x7fffffffd870, 
    cur_cd_chain=0x7fffffffd860)
    at /space/rguenther/src/svn/trunk/gcc/tree-ssa-uninit.c:300
#2  0x0000000000d43574 in compute_control_dep_chain (bb=0x7ffff6b439c0, 
    dep_bb=0x7ffff6b4b820, cd_chains=0x1d67f20, num_chains=0x7fffffffd870, 
    cur_cd_chain=0x7fffffffd860)
    at /space/rguenther/src/svn/trunk/gcc/tree-ssa-uninit.c:293
#3  0x0000000000d43574 in compute_control_dep_chain (bb=0x7ffff6d32c98, 
    dep_bb=0x7ffff6b4b820, cd_chains=0x1d67f20, num_chains=0x7fffffffd870, 
    cur_cd_chain=0x7fffffffd860)
    at /space/rguenther/src/svn/trunk/gcc/tree-ssa-uninit.c:293
#4  0x0000000000d43574 in compute_control_dep_chain (bb=0x7ffff6d32a28, 
    dep_bb=0x7ffff6b4b820, cd_chains=0x1d67f20, num_chains=0x7fffffffd870, 
    cur_cd_chain=0x7fffffffd860)
    at /space/rguenther/src/svn/trunk/gcc/tree-ssa-uninit.c:293
#5  0x0000000000d43574 in compute_control_dep_chain (bb=0x7ffff6d329c0, 
    dep_bb=0x7ffff6b4b820, cd_chains=0x1d67f20, num_chains=0x7fffffffd870, 
    cur_cd_chain=0x7fffffffd860)
    at /space/rguenther/src/svn/trunk/gcc/tree-ssa-uninit.c:293

Uninit diagnostic not being properly limited and appearantly not being
linear in complexity.