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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/64909] [4.8/5 regression] Missed vectorization
Date: Mon, 09 Feb 2015 14:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64909

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
E.g.
unsigned short a[32];
unsigned int b[32];

void
foo ()
{
  b[0] = a[0];
  b[1] = a[1];
  b[2] = a[2];
  b[3] = a[3];
}

will do, or b[0] = a[0] + 5; b[1] = a[1] + 5; b[2] = a[2] + 5; b[3] = a[3] + 5;
and similar.