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      1 // RUN: %clang_cc1 -fsyntax-only -ffreestanding %s -verify
      2 // RUN: %clang_cc1 -fsyntax-only -ffreestanding -x c++ %s -verify
      3 // expected-no-diagnostics
      4 
      5 #if defined(i386) || defined(__x86_64__)
      6 #include <pmmintrin.h>
      7 
      8 int __attribute__((__target__(("sse3")))) foo(int a) {
      9   _mm_mwait(0, 0);
     10   return 4;
     11 }
     12 #endif
     13