[Bug target/56788] New: _mm_frcz_sd and _mm_frcz_ss ignore their second argument

["glisse at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56788

             Bug #: 56788
           Summary: _mm_frcz_sd and _mm_frcz_ss ignore their second
                    argument
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: glisse@gcc.gnu.org
            Target: x86_64-linux-gnu


#include <x86intrin.h>
__m128d f(__m128d x, __m128d y){
  return _mm_frcz_sd(x,y);
}

is compiled to:

    vfrczsd    %xmm0, %xmm0
    ret

Notice the lack of any reference to xmm1...

In my opinion, __builtin_ia32_vfrczsd should take a single argument, and the
intrinsic should call first this builtin and then __builtin_ia32_movsd.