[Bug c/47139] New: ice in process_use, at tree-vect-stmts.c:290

[Bug c/47139] New: ice in process_use, at tree-vect-stmts.c:290

[regehr at cs dot utah.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47139

           Summary: ice in process_use, at tree-vect-stmts.c:290
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: regehr@cs.utah.edu
                CC: chenyang@cs.utah.edu


[regehr@gamow tmp433]$ current-gcc -O3 small.c -c

small.c: In function 'func_1':
small.c:19:1: internal compiler error: in process_use, at tree-vect-stmts.c:290
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

[regehr@gamow tmp433]$ current-gcc -v

Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r168380-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-r168380-install
--program-prefix=r168380- --enable-languages=c,c++
Thread model: posix
gcc version 4.6.0 20101231 (experimental) (GCC) 

[regehr@gamow tmp433]$ cat small.c

typedef signed char int8_t;
typedef int int32_t;
typedef unsigned char uint8_t;
typedef unsigned short int uint16_t;
typedef unsigned int uint32_t;
static uint8_t
safe_add_func_uint32_t_u_u (uint32_t ui1, uint8_t ui2)
{
  return ui1 + ui2;
}

int32_t g_10;
int32_t *g_23 = &g_10;
int32_t **const volatile g = &g_23;
int32_t g_42;
int32_t *func_68 (uint16_t p_69, int8_t p_70);

uint8_t
func_1 (void)
{
  *g = func_68 (0x837BL, 0);
  return 0;
}

int32_t *
func_68 (uint16_t p_69, int8_t p_70)
{
  int32_t l_113;
  for (p_70 = 1; p_70; p_70 = safe_add_func_uint32_t_u_u (p_70, 1))
    {
      int32_t *l_118 = &g_42;
      *l_118 = l_113;
      l_113 |= p_70;
    }
  return 0;
}

int
main (int argc, char *argv[])
{
  func_1 ();
  return 0;
}

[Bug c/47139] ice in process_use, at tree-vect-stmts.c:290

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47139

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.01.01 11:36:12
                 CC|                            |jakub at gcc dot gnu.org
     Ever Confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-01-01 11:36:12 UTC ---
Simplified testcase:
int d;

void
foo ()
{
  int a = 0;
  unsigned char b;
  for (b = 1; b; b++)
    {
      d = a;
      a |= b;
    }
}

[Bug tree-optimization/47139] [4.6 Regression] ice in process_use, at tree-vect-stmts.c:290

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47139

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.5.2
   Target Milestone|---                         |4.6.0
            Summary|ice in process_use, at      |[4.6 Regression] ice in
                   |tree-vect-stmts.c:290       |process_use, at
                   |                            |tree-vect-stmts.c:290
      Known to fail|                            |4.6.0

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-01-01 12:28:45 UTC ---
Introduced by http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=158018

[Bug tree-optimization/47139] [4.6 Regression] ice in process_use, at tree-vect-stmts.c:290

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47139

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1

[Bug tree-optimization/47139] [4.6 Regression] ice in process_use, at tree-vect-stmts.c:290

[irar at il dot ibm.com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47139

Ira Rosen <irar at il dot ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |irar at il dot ibm.com
         AssignedTo|unassigned at gcc dot       |irar at il dot ibm.com
                   |gnu.org                     |

--- Comment #3 from Ira Rosen <irar at il dot ibm.com> 2011-01-04 11:58:35 UTC ---
This shouldn't be recognized as reduction, because the value of the one before
last iteration is used outside the loop. I'll add this check to reduction
detection.

Ira

[Bug tree-optimization/47139] [4.6 Regression] ice in process_use, at tree-vect-stmts.c:290

[irar at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47139

--- Comment #4 from irar at gcc dot gnu.org 2011-01-06 07:34:28 UTC ---
Author: irar
Date: Thu Jan  6 07:34:24 2011
New Revision: 168535

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=168535
Log:

        PR tree-optimization/47139
        * tree-vect-loop.c (vect_is_simple_reduction_1): Check that 
        only the last reduction value is used outside the loop. Update
        documentation.


Added:
    trunk/gcc/testsuite/gcc.dg/vect/pr47139.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-loop.c

[Bug tree-optimization/47139] [4.6 Regression] ice in process_use, at tree-vect-stmts.c:290

[irar at il dot ibm.com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47139

Ira Rosen <irar at il dot ibm.com> changed:

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

--- Comment #5 from Ira Rosen <irar at il dot ibm.com> 2011-01-06 07:35:45 UTC ---
Fixed.