[Bug other/57202] New: Please make the intrinsics headers like immintrin.h be usable without compiler flags

[Bug other/57202] New: Please make the intrinsics headers like immintrin.h be usable without compiler flags

[thiago at kde dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57202

             Bug #: 57202
           Summary: Please make the intrinsics headers like immintrin.h be
                    usable without compiler flags
    Classification: Unclassified
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: other
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: thiago@kde.org


Please make all headers for intrinsics be includable without special compiler
flags.

In other words, I want the following to work:

$ gcc -fsyntax-only -include smmintrin.h -xc /dev/null
In file included from <command-line>:0:0:
/usr/lib/gcc/x86_64-redhat-linux/4.7.2/include/smmintrin.h:31:3: error: #error
"SSE4.1 instruction set not enabled"

Note it works with ICC:
$ icc -fsyntax-only -include smmintrin.h -xc /dev/null && echo works
works


Not only that, please make all the intrinsics functions be defined and ready to
be used.

This is necessary so that the following source file could compile even if
-msse4.1 is not passed on the command-line (adapted from
http://gcc.gnu.org/gcc-4.8/changes.html):

#include <smmintrin.h>

 __attribute__ ((target ("default")))
int foo(void)
{
  return 1;
}

__attribute__ ((target ("sse4.2")))
int foo(void)
{
  __m128i v;
  _mm_blendv_epi8(v, v, v);
  return 2;
}

There are several reasons for that, number one among them that it makes the GCC
4.8 feature above actually useful for non-trivial code. Also, passing extra
options on the command-line are simply not an option for C++ code (where the
feature above is useful) if that code is moderately complex and uses inline
functions, and those options cannot be used if LTO is to be used (bug 54231).

[Bug target/57202] Please make the intrinsics headers like immintrin.h be usable without compiler flags

[thiago at kde dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57202

Thiago Macieira <thiago at kde dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|x86_64-*-* i?86-*-*         |x86_64-*-* i?86-*-* arm-*-*

--- Comment #1 from Thiago Macieira <thiago at kde dot org> 2013-05-08 07:03:26 UTC ---
This also applies to arm_neon.h.

[Bug target/57202] Please make the intrinsics headers like immintrin.h be usable without compiler flags

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57202

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|x86_64-*-* i?86-*-* arm-*-* |x86_64-*-* i?86-*-*

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> 2013-05-08 07:35:52 UTC ---
(In reply to comment #1)
> This also applies to arm_neon.h.

Please file a bug separate for arm.

[Bug target/57202] Please make the intrinsics headers like immintrin.h be usable without compiler flags

[thiago at kde dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57202

--- Comment #5 from Thiago Macieira <thiago at kde dot org> ---
(In reply to Marc Glisse from comment #4)
> Can this be closed?

Oh, yeah, this is working fine in GCC 4.9.

[Bug target/57202] Please make the intrinsics headers like immintrin.h be usable without compiler flags

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57202

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
      Known to work|                            |4.9.0
         Resolution|---                         |FIXED
   Target Milestone|---                         |4.9.0

--- Comment #6 from Marc Glisse <glisse at gcc dot gnu.org> ---
Thanks.