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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/64909] [4.8/5 regression] Missed vectorization
Date: Mon, 02 Feb 2015 23:43:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64909

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2015-02-02
     Ever confirmed|0                           |1

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Today's mainline generates:

    movzwl    a+16(%rip), %eax
    pxor    %xmm1, %xmm1
    movdqa    a(%rip), %xmm0
    movdqa    %xmm0, %xmm2
    movl    %eax, b+32(%rip)
    movzwl    a+18(%rip), %eax
    punpcklwd    %xmm1, %xmm2
    punpckhwd    %xmm1, %xmm0
    movl    %eax, b+36(%rip)
    movzwl    a+20(%rip), %eax
    movaps    %xmm2, b(%rip)
    movaps    %xmm0, b+16(%rip)
    movl    %eax, b+40(%rip)
    movzwl    a+22(%rip), %eax
    movl    %eax, b+44(%rip)
    ret

at -O3.