[Bug lto/65950] Loop is not vectorized with lto.

[gcp at sjeng dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65950

Gian-Carlo Pascutto <gcp at sjeng dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |gcp at sjeng dot org

--- Comment #6 from Gian-Carlo Pascutto <gcp at sjeng dot org> ---
I'm seeing similar behavior in gcc-4.9.2 (debian stable) and gcc-5.3.1 (Ubuntu
16.04 prelease).

Adding -flto causes certain loops not to get vectorized, adding -fno-lto to
affected files fixes it.

Unfortunately producing a reduced testcase is not so easy, but program source
is available to gcc devs on request.