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References: <bug-36992-682@http.gcc.gnu.org/bugzilla/>
Subject: [Bug target/36992] Very stange code for _mm_move_epi64
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------- Comment #6 from rguenth at gcc dot gnu dot org  2008-08-01 13:21 -------
with -march=core2 it uses

        movd    %xmm0, %rax
        movq    %rax, %xmm0

with -march=opteron (and -march=generic) it uses

        movhps  .LC0(%rip), %xmm0

ISTR there is some penalty for using movq on opteron?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36992