[Bug c++/54079] New: __builtin_ia32_palignr128 can't be called

[Bug c++/54079] New: __builtin_ia32_palignr128 can't be called

[jens.maurer at gmx dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54079

             Bug #: 54079
           Summary: __builtin_ia32_palignr128 can't be called
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jens.maurer@gmx.net


#pragma GCC target ("ssse3")

int main()
{
   long long x __attribute__((vector_size(16)));
   x = __builtin_ia32_palignr128(x, x, 4);
}


yields:


$ g++ x.cc 
x.cc: In function ‘int main()’:
x.cc:7:42: error: the last argument must be an 8-bit immediate


How much more "immediate" can you get when you pass an integer literal?

[Bug c++/54079] __builtin_ia32_palignr128 can't be called

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54079

--- Comment #1 from Uros Bizjak <ubizjak at gmail dot com> 2012-07-24 10:45:32 UTC ---
Probably there is a compelling reason you don't use tmmintrin.h.

Anyway, the error is a bit unfortunate, you have to pass 8*N to the builtin.

[Bug target/54079] __builtin_ia32_palignr128 can't be called

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54079

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |uros at gcc dot gnu.org
          Component|c++                         |target

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-10-10 19:46:36 UTC ---
Uros, what's the status of this issue? For sure isn't C++ front-end specific,
but I don't understand if "somebody" should tweak the error message or
something.

[Bug target/54079] __builtin_ia32_palignr128 can't be called

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54079

Uros Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |WONTFIX

--- Comment #3 from Uros Bizjak <ubizjak at gmail dot com> 2012-10-11 06:37:17 UTC ---
(In reply to comment #2)
> Uros, what's the status of this issue? For sure isn't C++ front-end specific,
> but I don't understand if "somebody" should tweak the error message or
> something.

Builtins are internal implementation details, users should use various .h
files.

So, wontfix.