[Bug c/38428] New: ice for Linux kernel code with -O2

[Bug c/38428] New: ice for Linux kernel code with -O2

[dcb314 at hotmail dot com]

I just tried to compile the Linux kernel version 2.6.27.7
with the GNU C compiler version 4.4 snapshot 20081205.

The compiler said

drivers/scsi/qla2xxx/qla_os.c: In function 'qla2x00_free_device':
drivers/scsi/qla2xxx/qla_os.c:1809: internal compiler error: in
gimple_rhs_has_side_effects, at gimple.c:2343
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Preprocessed source code attached. Flag -O2 required.


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           Summary: ice for Linux kernel code with -O2
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dcb314 at hotmail dot com
  GCC host triplet: suse-linux-x86_64


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38428

[Bug c/38428] ice for Linux kernel code with -O2

[dcb314 at hotmail dot com]

------- Comment #1 from dcb314 at hotmail dot com  2008-12-06 12:28 -------
Created an attachment (id=16840)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16840&action=view)
C source code


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38428

[Bug c/38428] ice for Linux kernel code with -O2

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2008-12-06 12:50 -------
reducing.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38428

[Bug middle-end/38428] [4.4 Regression] ice for Linux kernel code with -O2

[rguenth at gcc dot gnu dot org]

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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c                           |middle-end
           Keywords|                            |ice-on-valid-code
      Known to work|                            |4.3.2
            Summary|ice for Linux kernel code   |[4.4 Regression] ice for
                   |with -O2                    |Linux kernel code with -O2
   Target Milestone|---                         |4.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38428

[Bug middle-end/38428] [4.4 Regression] ice for Linux kernel code with -O2

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2008-12-06 13:05 -------
typedef unsigned int __u32;
typedef __u32 uint32_t;
typedef struct {
    volatile struct {
        uint32_t online : 1;
    } flags;
} scsi_qla_host_t;
int qla2x00_wait_for_hba_online(scsi_qla_host_t *ha) {
    int return_status;
    scsi_qla_host_t *pha = to_qla_parent(ha);
    if (pha->flags.online)   
      return_status = (0x4000 & 0x3fff);
    else   
      return_status = 0x102;
    return (return_status);
}


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-12-06 13:05:03
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38428

[Bug middle-end/38428] [4.4 Regression] ice for Linux kernel code with -O2

[jakub at gcc dot gnu dot org]

------- Comment #4 from jakub at gcc dot gnu dot org  2008-12-06 13:06 -------
Apparently caused by my PR37248 patch.  We have a volatile bitfield, and the
patch (similarly to 4.3) creates a TREE_THIS_VOLATILE TREE_SIDE_EFFECTS
BIT_FIELD_REF, but apparently the trunk is upset about it.

Either we just don't try to optimize volatile bitfields at all (don't create
BIT_FIELD_REFs for them), or some changes are needed to handle volatile
BIT_FIELD_REFs.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38428

[Bug middle-end/38428] [4.4 Regression] ice for Linux kernel code with -O2

[jakub at gcc dot gnu dot org]

------- Comment #5 from jakub at gcc dot gnu dot org  2008-12-06 21:08 -------
Subject: Bug 38428

Author: jakub
Date: Sat Dec  6 21:06:43 2008
New Revision: 142527

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=142527
Log:
        PR middle-end/38428
        * tree-ssa-operands.c (get_expr_operands) <case BIT_FIELD_REF>: Set
        gimple_set_has_volatile_ops if the BIT_FIELD_REF is volatile.

        * gcc.c-torture/compile/pr38428.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/pr38428.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-operands.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38428

[Bug middle-end/38428] [4.4 Regression] ice for Linux kernel code with -O2

[jakub at gcc dot gnu dot org]

------- Comment #6 from jakub at gcc dot gnu dot org  2008-12-06 21:17 -------
Fixed.


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jakub at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38428