[Bug c/35540] New: Segmentation fault with __builtin_parity() and -O1

[Bug c/35540] New: Segmentation fault with __builtin_parity() and -O1

[r dot schuerer at gmx dot at]

Consider the following C-Program main.c:

/*********************************************/
int f (unsigned* a, int b)
{
   return b ? 1 : __builtin_parity(*a);
}
int main()
{
   unsigned a = 0;
   return f(&a, 0);
}
/*********************************************/

Using GCC 4.3.0:

$ /usr/local/gcc-4.3.0/bin/gcc-4.3.0 -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.3.0/configure --prefix=/usr/local/gcc-4.3.0
--program-suffix=-4.3.0 --with-mpfr=/usr/local/ --with-tune=pentium4
--with-arch=pentium4 --enable-languages=c,c++,fortran,java,objc
Thread model: posix
gcc version 4.3.0 (GCC)

When compliled with -O0, the program runs successfully:

$ /usr/local/gcc-4.3.0/bin/gcc-4.3.0 -O0 main.c
$ ./a.out

When complied with -O1, the program segfaults.

$ /usr/local/gcc-4.3.0/bin/gcc-4.3.0 -O1 main.c
$ ./a.out
Segmentation fault

The program runs successfully when compiled with -O2 or -O3.
The program runs successfully with GCC 4.2.3 in all optimization levels.


-- 
           Summary: Segmentation fault with __builtin_parity() and -O1
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: r dot schuerer at gmx dot at
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35540

[Bug c/35540] Segmentation fault with __builtin_parity() and -O1

[r dot schuerer at gmx dot at]

------- Comment #1 from r dot schuerer at gmx dot at  2008-03-11 15:13 -------
Created an attachment (id=15297)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15297&action=view)
The C source file triggering the bug


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35540

[Bug c/35540] Segmentation fault with __builtin_parity() and -O1

[r dot schuerer at gmx dot at]

------- Comment #2 from r dot schuerer at gmx dot at  2008-03-11 15:23 -------
The assembler code for f() (as listed by "objdump -d a.out") is as follows:

0804838c <f>:
 804838c:       55                      push   %ebp
 804838d:       89 e5                   mov    %esp,%ebp
 804838f:       b8 01 00 00 00          mov    $0x1,%eax
 8048394:       83 7d 0c 00             cmpl   $0x0,0xc(%ebp)
 8048398:       75 12                   jne    80483ac <f+0x20>
 804839a:       8b 45 08                mov    0x8(%ebp),%eax
 804839d:       0f b7 40 02             movzwl 0x2(%eax),%eax
 80483a1:       66 33 00                xor    (%eax),%ax
 80483a4:       30 e0                   xor    %ah,%al
 80483a6:       0f 9b c0                setnp  %al
 80483a9:       0f b6 c0                movzbl %al,%eax
 80483ac:       5d                      pop    %ebp
 80483ad:       c3                      ret

GDB says that:
Program received signal SIGSEGV, Segmentation fault.
0x080483a1 in f ()


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35540

[Bug target/35540] [4.3/4.4 Regression]: Segmentation fault with __builtin_parity() and -O1

[hjl dot tools at gmail dot com]

-- 

hjl dot tools at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hjl dot tools at gmail dot
                   |                            |com
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
      Known to fail|4.3.0                       |4.3.0 4.4.0
   Last reconfirmed|0000-00-00 00:00:00         |2008-03-11 15:35:58
               date|                            |
            Summary|Segmentation fault with     |[4.3/4.4 Regression]:
                   |__builtin_parity() and -O1  |Segmentation fault with
                   |                            |__builtin_parity() and -O1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35540

[Bug target/35540] [4.3/4.4 Regression]: Segmentation fault with __builtin_parity() and -O1

[ubizjak at gmail dot com]

------- Comment #3 from ubizjak at gmail dot com  2008-03-11 15:43 -------
Mine.


-- 

ubizjak at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |ubizjak at gmail dot com
                   |dot org                     |
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2008-03-11 15:35:58         |2008-03-11 15:43:20
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35540

[Bug target/35540] [4.3/4.4 Regression]: Segmentation fault with __builtin_parity() and -O1

[hjl dot tools at gmail dot com]

------- Comment #4 from hjl dot tools at gmail dot com  2008-03-11 15:53 -------
It was introduced between revisions 121818 and 122326.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35540

[Bug target/35540] [4.3/4.4 Regression]: Segmentation fault with __builtin_parity() and -O1

[uros at gcc dot gnu dot org]

------- Comment #5 from uros at gcc dot gnu dot org  2008-03-11 19:19 -------
Subject: Bug 35540

Author: uros
Date: Tue Mar 11 19:18:48 2008
New Revision: 133118

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=133118
Log:
        PR target/35540
        * config/i386/i386.md (paritysi2, paritydi2): Use register_operand
        constraint for operand 1.
        (paritysi2_cmp): Use register_operand constraint for operand 2.
        Use earlyclobber modifier for operand 1.  Remove support for
        memory operands.
        (paritydi2_cmp): Use register_operand constraint for operand 3.
        Use earlyclobber modifier for operand 1.  Remove support for
        memory operands.

testsuite/ChangeLog:

        PR target/35540
        * gcc.target/i386/pr35540.c: New test.


Added:
    trunk/gcc/testsuite/gcc.target/i386/pr35540.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.md
    trunk/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35540

[Bug target/35540] [4.3/4.4 Regression]: Segmentation fault with __builtin_parity() and -O1

[uros at gcc dot gnu dot org]

------- Comment #6 from uros at gcc dot gnu dot org  2008-03-12 06:37 -------
Subject: Bug 35540

Author: uros
Date: Wed Mar 12 06:37:10 2008
New Revision: 133135

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=133135
Log:
        PR target/35540
        * config/i386/i386.md (paritysi2, paritydi2): Use register_operand
        constraint for operand 1.
        (paritysi2_cmp): Use register_operand constraint for operand 2.
        Use earlyclobber modifier for operand 1.  Remove support for
        memory operands.
        (paritydi2_cmp): Use register_operand constraint for operand 3.
        Use earlyclobber modifier for operand 1.  Remove support for
        memory operands.

testsuite/ChangeLog:

        PR target/35540
        * gcc.target/i386/pr35540.c: New test.


Added:
    branches/gcc-4_3-branch/gcc/testsuite/gcc.target/i386/pr35540.c
      - copied unchanged from r133118,
trunk/gcc/testsuite/gcc.target/i386/pr35540.c
Modified:
    branches/gcc-4_3-branch/gcc/ChangeLog
    branches/gcc-4_3-branch/gcc/config/i386/i386.md
    branches/gcc-4_3-branch/gcc/testsuite/ChangeLog


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35540

[Bug target/35540] [4.3/4.4 Regression]: Segmentation fault with __builtin_parity() and -O1

[ubizjak at gmail dot com]

------- Comment #7 from ubizjak at gmail dot com  2008-03-12 06:42 -------
Fixed.


-- 

ubizjak at gmail dot com changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35540

[Bug target/35540] [4.3/4.4 Regression]: Segmentation fault with __builtin_parity() and -O1

[ubizjak at gmail dot com]

-- 

ubizjak at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.3.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35540