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From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug libc/12872] New: Wrong alignment of La_x86_64_vector
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http://sourceware.org/bugzilla/show_bug.cgi?id=12872

           Summary: Wrong alignment of La_x86_64_vector
           Product: glibc
           Version: 2.14
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: hjl.tools@gmail.com


sysdeps/x86_64/bits/link.h has

/* Registers for entry into PLT on x86-64.  */
# if __GNUC_PREREQ (4,0)
typedef float La_x86_64_xmm __attribute__ ((__vector_size__ (16)));
typedef float La_x86_64_ymm __attribute__ ((__vector_size__ (32)));
# else
typedef float La_x86_64_xmm __attribute__ ((__mode__ (__V4SF__)));
# endif

typedef union
{
# if __GNUC_PREREQ (4,0)
  La_x86_64_ymm ymm[2];
# endif
  La_x86_64_xmm xmm[4];
} La_x86_64_vector __attribute__ ((aligned(16)));


It makes La_x86_64_vector aligned at 16byte. Any access
to ymm field may cause unaligned access.

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