[LLVMbugs] [Bug 7145] New: Error with handling casting operator to SSE2 SIMD types

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7145

           Summary: Error with handling casting operator to SSE2 SIMD
                    types
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: joel.falcou at lri.fr
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


Here is a sample file that compiles correctly on g++ and MSVC:

#include <cstdio>
#include <xmmintrin.h>

template <class V > 
struct foo 
{
  V m;
  operator V() const { return m; }
}; 

int main()
{
  foo <__m128> x =  {{1, 2, 3, 4}};
  __m128 y = _mm_shuffle_ps(x, x, 0);
}


Latets clang (fresh from the SVN) on Linux x86 give the following error:

src/pipo.cpp:16:14: error: first two arguments to 
__builtin_shufflevector must be vectors
 __m128 y = _mm_shuffle_ps(x, x, 0);
            ^~~~~~~~~~~~~~~~~~~~~~~
In file included from src/pipo.cpp:2:
/usr/local/lib/clang/2.0/include/xmmintrin.h:726:10: note: instantiated 
from:
       (__builtin_shufflevector(a, b, (mask) & 0x3, ((mask) & 0xc) >> 2, \
        ^
1 error generated.

This error doesn't appear if we use _mm_add_ps or other intrinsics. Same 
behavior for __m128i and __m128d

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