[llvm-bugs] [Bug 28056] New: The _MM_ALIGN16 attribute miscompiles for *unix targets

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28056

            Bug ID: 28056
           Summary: The _MM_ALIGN16 attribute miscompiles for *unix
                    targets
           Product: clang
           Version: trunk
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Headers
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zvi.rackover at intel.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

------test.c------------
#include <xmmintrin.h>
 _MM_ALIGN16 char c;
------------------------

clang -cc1 test.c -ffreestanding -triple x86_64-apple-macosx10.9.0

repro.c:4:1: error: unknown type name '_MM_ALIGN16'
_MM_ALIGN16 char c;
^
repro.c:4:13: error: expected identifier or '('
_MM_ALIGN16 char c;
            ^
2 errors generated.
------------------------

<xmmintrin.h> seems to support _MM_ALIGN16 only on Windows:
#ifdef _MSC_VER
 #define _MM_ALIGN16 __declspec(align(16))
#endif

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