[Bug tree-optimization/66598] With -O3 gcc incorrectly assumes aligned SSE instructions (e.g. movapd) can be used

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66598

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2015-06-22
          Component|c                           |tree-optimization
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot 
gnu.org
     Ever confirmed|0                           |1

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I believe I fixed this on trunk for PR66510.  Confirmed with GCC 5 though.
GCC 6 now generates

.L2:
        movupd  16(%rax), %xmm0
        addq    $40, %rax
        addq    $32, %rdx
        movupd  -40(%rax), %xmm1
        movaps  %xmm0, -16(%rdx)
        movaps  %xmm1, -32(%rdx)
        cmpq    $P+1240, %rax
        jne     .L2
        movupd  P+1256(%rip), %xmm0
        xorl    %eax, %eax
        movupd  P+1240(%rip), %xmm1
        movaps  %xmm0, Q+1008(%rip)
        movaps  %xmm1, Q+992(%rip)
        ret

might be a bit hard to backport the changes though.

Mine nevertheless.