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

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri May 14 17:29:44 PDT 2010


           Summary: Error with handling casting operator to SSE2 SIMD
           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 
       (__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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