[Bug target/68482] No vectorization for x86-64

[lvqcl.mail at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68482

--- Comment #2 from lvqcl.mail at gmail dot com ---
(In reply to Marc Glisse from comment #1)
> The extra cast so 32-bit unsigned and 64-bit pointers can interact confuses
> the compiler. Trunk (gcc-6) seems to work fine though, can you confirm?

I never compiled GCC myself (and I use Windows), so I found and downloaded 
"gcc version 6.0.0 20151121 (experimental)" from
https://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Personal%20Builds/dongsheng-daily/

The loop is vectorized:
.L4:
        movdqu  (%rbx), %xmm0
        addl    $1, %r9d
        addq    $16, %rbx
        cmpl    %r9d, %edx
        paddd   %xmm0, %xmm1
        ja      .L4