[Bug c/29091] New: vector constant not fully outputed

[Bug c/29091] New: vector constant not fully outputed

[pinskia at gcc dot gnu dot org]

Testcase:
#include <stdlib.h>
__attribute__((vector_size(16))) int a = {1, 2};

int main(void)
{
  int *b = (int*)&a;
  if (b[0] != 1)
    abort ();
  if (b[1] != 2)
    abort ();
  if (b[2] != 0)
    abort ();
  if (b[3] != 0)
    abort ();
  return 0;
}

----
The VECTOR_CST has only two elements.


-- 
           Summary: vector constant not fully outputed
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091

[Bug c/29091] vector constant not fully outputed

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2006-09-14 23:07 -------
The C++ front-end produces:
a:
        .long   1
        .long   2
        .zero   8
While the C front-end does not have .zero there.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091

[Bug c/29091] [4.0/4.1/4.2 Regression] vector constant not fully outputed

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |3.3.3 3.4.0 4.0.0 4.1.0
                   |                            |4.2.0
      Known to work|                            |3.2.3
            Summary|vector constant not fully   |[4.0/4.1/4.2 Regression]
                   |outputed                    |vector constant not fully
                   |                            |outputed
   Target Milestone|---                         |4.0.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091

[Bug c/29091] [4.0/4.1/4.2 Regression] vector constant not fully outputed

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2006-09-15 05:35 -------
3.2.3 on x86 with -msse (since we did not have generic vectors until 3.3)
works.
And 3.3.3 fails (even with -msse).
Note a better testcase is something like:
#include <stdlib.h>
__attribute__((vector_size(16))) int a = {1, 2};
int c = 1;
__attribute__((vector_size(16))) int b = {1, 2};

int main(void)
{
  int *b = (int*)&a;
  if (b[0] != 1)
    abort ();
  if (b[1] != 2)
    abort ();
  if (b[2] != 0)
    abort ();
  if (b[3] != 0)
    abort ();
  return 0;
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091

[Bug c/29091] [4.0/4.1/4.2 Regression] vector constant not fully outputed

[steven at gcc dot gnu dot org]

-- 

steven 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         |2006-09-16 10:16:06
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091

[Bug c/29091] [4.0/4.1/4.2 Regression] vector constant not fully outputed

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2006-09-17 01:23 -------
This was caused by:
2003-04-01  Aldy Hernandez  <aldyh@redhat.com>

        * testsuite/gcc.c-torture/execute/simd-3.c: New.

        * expr.c (expand_expr): Handle VECTOR_CST.
        (const_vector_from_tree): New.

        * varasm.c (output_constant): Handle VECTOR_CST.

        * c-typeck.c (digest_init): Build a vector constant from a
        VECTOR_TYPE.


Specificly the digest_init change, though output_constant does not check make
sure we have the right number of elements either.  build_vector does not
either.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |aldyh at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091

[Bug c/29091] [4.0/4.1/4.2 Regression] vector constant not fully outputed

[mmitchel at gcc dot gnu dot org]

-- 

mmitchel at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091

[Bug c/29091] [4.0/4.1/4.2 Regression] vector constant not fully outputed

[jakub at gcc dot gnu dot org]

-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |jakub at gcc dot gnu dot org
                   |dot org                     |
                URL|                            |http://gcc.gnu.org/ml/gcc-
                   |                            |patches/2006-
                   |                            |10/msg00193.html
             Status|NEW                         |ASSIGNED
           Keywords|                            |patch
   Last reconfirmed|2006-09-16 10:16:06         |2006-10-04 16:28:13
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091

[Bug c/29091] [4.0/4.1/4.2 Regression] vector constant not fully outputed

[jakub at gcc dot gnu dot org]

------- Comment #4 from jakub at gcc dot gnu dot org  2006-10-06 07:16 -------
Subject: Bug 29091

Author: jakub
Date: Fri Oct  6 07:15:48 2006
New Revision: 117481

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=117481
Log:
        PR c/29091
        * varasm.c (output_constant): If TREE_VECTOR_CST_ELTS chain is shorter
than
        the number of vector elements fill the rest with zeros.

        * gcc.dg/pr29091.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr29091.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/varasm.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091

[Bug c/29091] [4.0/4.1 Regression] vector constant not fully outputed

[jakub at gcc dot gnu dot org]

------- Comment #5 from jakub at gcc dot gnu dot org  2006-10-06 07:42 -------
Fixed on the trunk so far.


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.0/4.1/4.2 Regression]    |[4.0/4.1 Regression] vector
                   |vector constant not fully   |constant not fully outputed
                   |outputed                    |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091

[Bug c/29091] [4.0/4.1 Regression] vector constant not fully outputed

[jakub at gcc dot gnu dot org]

------- Comment #6 from jakub at gcc dot gnu dot org  2006-10-16 09:58 -------
Subject: Bug 29091

Author: jakub
Date: Mon Oct 16 09:58:48 2006
New Revision: 117779

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=117779
Log:
        PR c/29091
        * varasm.c (output_constant): If TREE_VECTOR_CST_ELTS chain is shorter
than
        the number of vector elements fill the rest with zeros.

        * gcc.dg/pr29091.c: New test.

Added:
    branches/gcc-4_1-branch/gcc/testsuite/gcc.dg/pr29091.c
Modified:
    branches/gcc-4_1-branch/gcc/ChangeLog
    branches/gcc-4_1-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_1-branch/gcc/varasm.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091

[Bug c/29091] [4.0 Regression] vector constant not fully outputed

[gdr at gcc dot gnu dot org]

------- Comment #7 from gdr at gcc dot gnu dot org  2007-02-03 20:16 -------
Fixed in GCC-4.1.2.


-- 

gdr at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|4.0.4                       |4.1.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29091