[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.