[Bug other/70118] New: UBSan claims misaligned access in SSE instrinsics

[linux at carewolf dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70118

            Bug ID: 70118
           Summary: UBSan claims misaligned access in SSE instrinsics
           Product: gcc
           Version: 5.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: linux at carewolf dot com
  Target Milestone: ---

The intrinsics _mm_loadl_epi64 and _mm_storel_epi64 triggers UBSan warnings on
unaligned access because the instrinsics definitions in emmintrin.h are using
__m64 and __v2di pointers, and both those types have been declared with default
alignment. The intrinsics definitions should probably either be replaced with a
__builtin_ia32_movq, or the __m64 and __v2di types be defined with
__attribute__ ((aligned(1))).