[Bug c/19820] New: How to get results from a V2SF ?

[Bug c/19820] New: How to get results from a V2SF ?

[plm at netspace dot net dot au]

This is probably not really a bug, just a hole in the documentation. While
google can demonstrate how to get values into vectors, and the info pages the
names of the manipulation functions avaliable, there seems to be no
documentation on how to get at the results of the manipulation.

How do you get at the results?

typedef float V2SF __attribute__((vector_size(8)));

int main()
{
  V2SF a = { 2.0, 3.0 };
  V2SF b = { 4.0, 5.0 };
  V2SF c;

  c = __builtin_ia32_pfmul(a,b);  
  
  /* how to get at the values in c? */
    
  return 0;
};

-- 
           Summary: How to get results from a V2SF ?
           Product: gcc
           Version: 3.3.4
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: plm at netspace dot net dot au
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19820

[Bug c/19820] How to get results from a V2SF ?

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-02-08 13:37 -------
Hmm, I thought this was documented but you use an union.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19820

[Bug c/19820] How to get results from a V2SF ?

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |documentation


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19820

[Bug c/19820] How to get results from a V2SF ?

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-06-20 18:42 -------
Confirmed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-06-20 18:42:25
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19820

[Bug c/19820] How to get results from a V2SF ?

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19820

Marc Glisse <glisse at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |4.8.0

--- Comment #7 from Marc Glisse <glisse at gcc dot gnu.org> ---
4.7 branch is closed.

[Bug c/19820] How to get results from a V2SF ?

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19820

Marc Glisse <glisse at gcc dot gnu.org> changed:

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

--- Comment #6 from Marc Glisse <glisse at gcc dot gnu.org> 2013-01-13 10:40:44 UTC ---
Or was I too fast closing it and we need to explain the union / cast to pointer
tricks in the 4.6 and 4.7 documentations for C++ users? In doubt, I am putting
the status back to what it was, sorry.

[Bug c/19820] How to get results from a V2SF ?

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19820

Marc Glisse <glisse at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |glisse at gcc dot gnu.org
         Resolution|                            |FIXED

--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> 2013-01-13 10:35:41 UTC ---
Subscripts are documented for 4.6:
http://gcc.gnu.org/onlinedocs/gcc-4.6.3/gcc/Vector-Extensions.html
and they are available for C++ in 4.8, so closing.

[Bug c/19820] How to get results from a V2SF ?

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19820

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

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

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-11-17 21:54:48 UTC ---
This is now fixed in 4.7.0, you can do [0] for C (not for C++).

[Bug c/19820] How to get results from a V2SF ?

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2008-11-14 23:19 -------
You can do:
float *cf = &c;
return cf[0] + cf[1];

Or after my patch just c[0] + c[1].


-- 

pinskia at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19820