[Bug c/43781] New: ice: verify_ssa failed

[Bug c/43781] New: ice: verify_ssa failed

[regehr at cs dot utah dot edu]

[regehr@gamow tmp405]$ current-gcc -c -O2 small.c
small.c: In function 'int32func':
small.c:26:1: error: definition in block 8 follows the use
for SSA_NAME: g_313.0_6 in statement:
# VUSE <.MEM_22>
g_313.8_12 = *g_313.0_6;
small.c:26:1: internal compiler error: verify_ssa failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

[regehr@gamow tmp405]$ cat small.c

typedef int int32_t;
typedef unsigned char uint8_t;

struct S0
{
  uint8_t f3;
};

struct S2
{
  uint8_t f5;
};

struct S0 g_22 = {
  0
};

int32_t g_91;
const struct S2 *g_314;
const struct S2 **g_313 = &g_314;
struct S2 g_320[2] = {
  0
};

void
int32func (uint64p_34)
{
  for (g_22.f3 = 0; g_22.f3 <= 0; g_22.f3)
    {
    lbl_491:{
        if (1)
          {
            int32_t *l_453[2][7][7][1][1];
            int i, j, k, l, m;
            for (m; m; m++)
              l_453[i][j][k][l][m];
          }
        *g_313 = 0;
        if (g_91)
          goto lbl_491;
      }
    }
}

[regehr@gamow tmp405]$ current-gcc -v

Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r158448-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-r158448-install
--program-prefix=r158448- --enable-languages=c,c++
Thread model: posix
gcc version 4.6.0 20100416 (experimental) (GCC)


-- 
           Summary: ice: verify_ssa failed
           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=43781

[Bug c/43781] ice: verify_ssa failed

[hjl dot tools at gmail dot com]

------- Comment #1 from hjl dot tools at gmail dot com  2010-04-18 15:20 -------
It is caused by revision 158380:

http://gcc.gnu.org/ml/gcc-cvs/2010-04/msg00486.html


-- 

hjl dot tools at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2010-04-18 15:20:10
               date|                            |
   Target Milestone|---                         |4.6.0
            Version|unknown                     |4.6.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43781

[Bug c/43781] [4.6 Regression] ice: verify_ssa failed

[rguenth at gcc dot gnu dot org]

-- 

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|2010-04-18 15:20:10         |2010-04-18 17:23:26
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43781

[Bug c/43781] [4.6 Regression] ice: verify_ssa failed

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2010-04-18 20:14 -------
Loop invariant motion breaks this.

 <bb 6>:
-  g_313.0_6 = pretmp.4_9;
-  *g_313.0_6 = 0B;

 <bb 8>:
   # m_21 = PHI <0(11), m_3(D)(2)>
+  g_313.8_12 = *g_313.0_6;
+  g_313.0_6 = pretmp.4_9;
   goto <bb 5>;

we insert stmts not preserving ordering.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43781

[Bug tree-optimization/43781] [4.6 Regression] ice: verify_ssa failed

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2010-06-28 11:53 -------
I can no longer reproduce this.


-- 

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=43781

[Bug tree-optimization/43781] [4.6 Regression] ice: verify_ssa failed

[hjl at gcc dot gnu dot org]

------- Comment #4 from hjl at gcc dot gnu dot org  2010-06-28 17:26 -------
Subject: Bug 43781

Author: hjl
Date: Mon Jun 28 17:25:49 2010
New Revision: 161505

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=161505
Log:
Add a testcase for PR tree-optimization/43781.

2010-06-28  H.J. Lu  <hongjiu.lu@intel.com>

        PR tree-optimization/43781
        * gcc.dg/torture/pr43781.c: New.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr43781.c
Modified:
    trunk/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43781