[cfe-dev] [Clang++] Error with handling casting operator to SIMD types

[joel falcou]

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

-- 
___________________________________________
Joel Falcou - Assistant Professor
PARALL Team - LRI - Universite Paris Sud XI
Tel : (+33)1 69 15 66 35