[Bug c/30383] New: ice for legal code on x86_64

[Bug c/30383] New: ice for legal code on x86_64

[dcb314 at hotmail dot com]

I just tried to compile package libhugetlbfs-1.0.1-200612221420
with the GNU C compiler version 4.2 snapshot 20061230

The compiler said

/usr/include/bits/string3.h: In function 'jumpfunc':
/usr/include/bits/string3.h:51: internal compiler error: in ix86_expand_movmem,
at config/i386/i386.c:13608
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

Preprocessed source code attached. Flags -march=opteron -O2 required.


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           Summary: ice for legal code on x86_64
           Product: gcc
           Version: 4.3.0
            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: x86_64-suse-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30383

[Bug c/30383] ice for legal code on x86_64

[dcb314 at hotmail dot com]

------- Comment #1 from dcb314 at hotmail dot com  2007-01-05 15:31 -------
Created an attachment (id=12860)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12860&action=view)
C source code


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30383

[Bug target/30383] [4.3 Regression] ice for legal code on x86_64 in ix86_expand_movmem

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hubicka at gcc dot gnu dot
                   |                            |org
           Keywords|                            |ice-on-valid-code
            Summary|ice for legal code on x86_64|[4.3 Regression] ice for
                   |in ix86_expand_movmem       |legal code on x86_64 in
                   |                            |ix86_expand_movmem
   Target Milestone|---                         |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30383

[Bug target/30383] [4.3 Regression] ice for legal code on x86_64 in ix86_expand_movmem

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2007-01-07 00:47 -------
Reduced testcase:
void jumpfunc(int copy, void *p)
{
__builtin_memcpy (p, &&dummy, 128);
 dummy: ;
}

------------
This code is undefined as the address of a label will never be 128bytes, it
will either be 4 or 8 bytes.


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pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   GCC host triplet|x86_64-suse-linux           |
 GCC target triplet|x86_64-linux-gnu            |i?86-*-* x86_64-*-*
   Last reconfirmed|0000-00-00 00:00:00         |2007-01-07 00:47:17
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30383

[Bug target/30383] [4.3 Regression] ice for legal code on x86_64 in ix86_expand_movmem

[hubicka at gcc dot gnu dot org]

------- Comment #3 from hubicka at gcc dot gnu dot org  2007-01-07 03:23 -------
Created an attachment (id=12868)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12868&action=view)
fix in testing

testing a fix.


-- 

hubicka at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |hubicka at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30383

[Bug target/30383] [4.3 Regression] ice for legal code on x86_64 in ix86_expand_movmem

[bonzini at gnu dot org]

------- Comment #4 from bonzini at gnu dot org  2007-01-08 13:32 -------
> This code is undefined as the address of a label will never be 128bytes, it
> will either be 4 or 8 bytes.

No, that would be

void *p = &&dummy;
memcpy (foo, &p, sizeof (p));

Here, it's copying code from the address of the label.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30383

[Bug target/30383] [4.3 Regression] ice for legal code on x86_64 in ix86_expand_movmem

[pinskia at gcc dot gnu dot org]

------- Comment #5 from pinskia at gcc dot gnu dot org  2007-06-18 02:18 -------
This has been working since "4.3.0 20070131" so closing.


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pinskia at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30383