[Bug c/44977] New: ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728

[Bug c/44977] New: ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728

[regehr at cs dot utah dot edu]

[regehr@bethe tmp603]$ current-gcc -O2 small.c -c
small.c: In function 'int329':
small.c:31:38: warning: assignment makes integer from pointer without a cast
[enabled by default]
small.c:24:5: internal compiler error: in propagate_rhs_into_lhs, at
tree-ssa-dom.c:2728
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

[regehr@bethe tmp603]$ cat small.c

static unsigned short
foo (unsigned short ui1, unsigned short ui2)
{
  return ui1 - ui2;
}

static unsigned short
bar (unsigned ui1, unsigned short ui2)
{
  return ui1 + ui2;
}

struct S1
{
  const short f3;
};
int g_31;
short g_67;
struct S1 g_68[2][5][9][1][1] = {
};

int func_90 (int);

int int329 (int * const *const int32p_81, short ** p_82)
{
  short l_169[8];
  for (g_31 = 0; g_31 <= 0; g_31 = foo (g_31, 1))
    {
      short l_85;
    lbl_89:g_67 ^= l_85;
      for (l_85 = 0; l_85 >= 0; l_85 = bar)
        if (g_31)
          goto lbl_89;
      func_90 (1), g_68[0][2][2][0][0].f3, 0;
    }
  return l_169[6];
}

[regehr@bethe tmp603]$ current-gcc -v

Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r162241-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto
--prefix=/home/regehr/z/compiler-install/gcc-r162241-install
--program-prefix=r162241- --enable-languages=c,c++
Thread model: posix
gcc version 4.6.0 20100716 (experimental) (GCC)


-- 
           Summary: ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: regehr at cs dot utah dot edu
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44977

[Bug c/44977] [4.4/4.5/4.6 Regression] ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728

[hjl dot tools at gmail dot com]

-- 

hjl dot tools at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2010-07-18 14:42:54
               date|                            |
            Summary|ice in                      |[4.4/4.5/4.6 Regression] ice
                   |propagate_rhs_into_lhs, at  |in propagate_rhs_into_lhs,
                   |tree-ssa-dom.c:2728         |at tree-ssa-dom.c:2728
            Version|unknown                     |4.4.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44977

[Bug c/44977] [4.4/4.5/4.6 Regression] ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728

[hjl dot tools at gmail dot com]

------- Comment #1 from hjl dot tools at gmail dot com  2010-07-18 18:01 -------
It is caused by revision 139286:

http://gcc.gnu.org/ml/gcc-cvs/2008-08/msg00848.html


-- 

hjl dot tools at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44977

[Bug tree-optimization/44977] [4.4/4.5/4.6 Regression] ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2010-07-18 18:42 -------
Mine.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2010-07-18 14:42:54         |2010-07-18 18:42:24
               date|                            |
   Target Milestone|---                         |4.4.6


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44977

[Bug tree-optimization/44977] [4.4/4.5/4.6 Regression] ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2010-07-20 11:20 -------
#1  0x0000000000aeab84 in propagate_rhs_into_lhs (stmt=0x7ffff5b4d370, 
    lhs=0x7ffff5afc738, rhs=0x7ffff5afc738, interesting_names=0x17b93c8)
    at /space/rguenther/src/svn/trunk/gcc/tree-ssa-dom.c:2728
2728          gcc_assert (!all || has_zero_uses (lhs));
(gdb) p all
$1 = 1 '\001'
(gdb) p lhs
(gdb) call debug_immediate_uses_for (lhs)
g_67.1_6 : --> single use.
g_67.1_6 = g_67.1_6;


We have

<bb 9>:
  # l_85_37 = PHI <0(9), 0(4)>
  # prephitmp.12_36 = PHI <g_67.1_6(9), g_67.1_7(4)>
  g_67.1_6 = prephitmp.12_36 ^ l_85_37;
  goto <bb 9>;

and eliminate_degenerate_phis replaces it with the above through the
intermediate

<bb 9>:
  # prephitmp.12_36 = PHI <g_67.1_6(9)>
  g_67.1_6 = prephitmp.12_36;
  goto <bb 9>;

I have a patch.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44977

[Bug tree-optimization/44977] [4.4 Regression] ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2010-07-20 12:45 -------
Fixed on trunk and the 4.5 branch sofar.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |4.4.4 4.5.0
      Known to work|                            |4.5.1 4.6.0
            Summary|[4.4/4.5/4.6 Regression] ice|[4.4 Regression] ice in
                   |in propagate_rhs_into_lhs,  |propagate_rhs_into_lhs, at
                   |at tree-ssa-dom.c:2728      |tree-ssa-dom.c:2728
   Target Milestone|4.4.6                       |4.4.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44977

[Bug tree-optimization/44977] [4.4/4.5/4.6 Regression] ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2010-07-20 12:41 -------
Subject: Bug 44977

Author: rguenth
Date: Tue Jul 20 12:41:20 2010
New Revision: 162334

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162334
Log:
2010-07-20  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/44977
        * tree-ssa-dom.c (propagate_rhs_into_lhs): Do not create invalid
        SSA form.

        * gcc.dg/torture/pr44977.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr44977.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-dom.c


------- Comment #5 from rguenth at gcc dot gnu dot org  2010-07-20 12:44 -------
Subject: Bug 44977

Author: rguenth
Date: Tue Jul 20 12:44:16 2010
New Revision: 162335

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162335
Log:
2010-07-20  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/44977
        * tree-ssa-dom.c (propagate_rhs_into_lhs): Do not create invalid
        SSA form.

        * gcc.dg/torture/pr44977.c: New testcase.

Added:
    branches/gcc-4_5-branch/gcc/testsuite/gcc.dg/torture/pr44977.c
Modified:
    branches/gcc-4_5-branch/gcc/ChangeLog
    branches/gcc-4_5-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_5-branch/gcc/tree-ssa-dom.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44977

[Bug tree-optimization/44977] [4.4 Regression] ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728

[rguenth at gcc dot gnu dot org]

------- Comment #7 from rguenth at gcc dot gnu dot org  2010-07-27 13:05 -------
Fixed.


-- 

rguenth at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44977

[Bug tree-optimization/44977] [4.4 Regression] ice in propagate_rhs_into_lhs, at tree-ssa-dom.c:2728

[rguenth at gcc dot gnu dot org]

------- Comment #8 from rguenth at gcc dot gnu dot org  2010-07-27 13:05 -------
Subject: Bug 44977

Author: rguenth
Date: Tue Jul 27 13:05:17 2010
New Revision: 162565

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162565
Log:
2010-07-27  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/44977
        * tree-ssa-dom.c (propagate_rhs_into_lhs): Do not create invalid
        SSA form.

        * gcc.dg/torture/pr44977.c: New testcase.

Added:
    branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/torture/pr44977.c
Modified:
    branches/gcc-4_4-branch/gcc/ChangeLog
    branches/gcc-4_4-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_4-branch/gcc/tree-ssa-dom.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44977