[Bug tree-optimization/37368] New: [4.4 Regression] Segfault in remove_unused_locals

[Bug tree-optimization/37368] New: [4.4 Regression] Segfault in remove_unused_locals

[tbm at cyrius dot com]

With current trunk (revision 139978)

(sid)743:tbm@em64t: ..4.3-2008-09-04-r139978/gcc] ./cc1 -quiet -O
~/xserver-xorg-video-mga.i
../../src/mga_dga.c: In function 'MGASetupDGAMode':
../../src/mga_dga.c:92: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.


-- 
           Summary: [4.4 Regression] Segfault in remove_unused_locals
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tbm at cyrius dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37368

[Bug tree-optimization/37368] [4.4 Regression] Segfault in remove_unused_locals

[tbm at cyrius dot com]

------- Comment #1 from tbm at cyrius dot com  2008-09-04 10:04 -------
Program received signal SIGSEGV, Segmentation fault.
remove_unused_locals () at gcc/tree-ssa-live.c:589
589         var_ann (t)->used = false;
(gdb) where
#0  remove_unused_locals () at gcc/tree-ssa-live.c:589
#1  0x00000000006404b5 in execute_function_todo (data=<value optimized out>) at
gcc/passes.c:951
#2  0x000000000064071f in execute_todo (flags=205336536) at gcc/passes.c:1024
#3  0x000000000064090b in execute_one_pass (pass=0x101b200) at
gcc/passes.c:1209
#4  0x0000000000640c35 in execute_pass_list (pass=0x101b200) at
gcc/passes.c:1326
#5  0x00000000007374bc in tree_rest_of_compilation (fndecl=0x7fa70c5d4c00) at
gcc/tree-optimize.c:418
#6  0x00000000008b0640 in cgraph_expand_function (node=0x7fa70c5d4d00) at
gcc/cgraphunit.c:1038
#7  0x00000000008b23b4 in cgraph_optimize () at gcc/cgraphunit.c:1097
#8  0x00000000004169c3 in c_write_global_declarations () at gcc/c-decl.c:8080
#9  0x00000000006e872f in toplev_main (argc=<value optimized out>, argv=<value
optimized out>)
    at gcc/toplev.c:979
#10 0x00007fa70cebf1a6 in __libc_start_main () from /lib/libc.so.6
#11 0x00000000004044d9 in _start ()
(gdb)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37368

[Bug tree-optimization/37368] [4.4 Regression] Segfault in remove_unused_locals

[tbm at cyrius dot com]

------- Comment #4 from tbm at cyrius dot com  2008-09-04 10:25 -------
Drop the "static" from the declaration of FindSmallestPitch() and you get:

(sid)1519:tbm@em64t: ~/delta/bin] /usr/lib/gcc-snapshot/bin/gcc -Wall -O -c
mini.c
mini.c: In function 'FindSmallestPitch':
mini.c:5: internal compiler error: in make_decl_rtl, at varasm.c:1297
Please submit a full bug report,


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37368

[Bug tree-optimization/37368] [4.4 Regression] Segfault in remove_unused_locals

[tbm at cyrius dot com]

------- Comment #2 from tbm at cyrius dot com  2008-09-04 10:24 -------
Created an attachment (id=16220)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16220&action=view)
Preprocessed code


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37368

[Bug tree-optimization/37368] [4.4 Regression] Segfault in remove_unused_locals

[tbm at cyrius dot com]

------- Comment #3 from tbm at cyrius dot com  2008-09-04 10:24 -------
/* Testcase by Martin Michlmayr <tbm@cyrius.com> */

static int
FindSmallestPitch (int i)
{
  int Pitches1[5];
  int *linePitches = ((void *) 0);
  switch (i)
  {
    case 0x0519:
      linePitches = Pitches1;
  }
  return *linePitches;
}
void MGASetupDGAMode (int i)
{
  FindSmallestPitch (i);
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37368

[Bug tree-optimization/37368] [4.4 Regression] Segfault in remove_unused_locals

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2008-09-04 11:57 -------


*** This bug has been marked as a duplicate of 37343 ***


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37368

[Bug tree-optimization/37368] [4.4 Regression] Segfault in remove_unused_locals

[rsandifo at gcc dot gnu dot org]

------- Comment #6 from rsandifo at gcc dot gnu dot org  2008-10-18 09:47 -------
*** Bug 36973 has been marked as a duplicate of this bug. ***


-- 

rsandifo at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |r0bertz at gentoo dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37368