[PATCH 1/2, x86] Add palignr support for AVX2.

[Evgeny Stupachenko]

Getting back to initial patch, is it ok?
It fixes gcc.target/i386/pr52252-atom.c for AVX2 make check.
X86 bootstrap is also ok.

2014-10-01  Evgeny Stupachenko  <evstupac@gmail.com>

        * config/i386/i386.c (expand_vec_perm_palignr): Extend to use AVX2
        PALINGR instruction.
        * config/i386/i386.c (ix86_expand_vec_perm_const_1): Add palignr try
        for AVX2.

On Wed, Sep 17, 2014 at 9:26 PM, Evgeny Stupachenko <evstupac@gmail.com> wrote:
> The test in pr62128 is exactly TEST 22 from
> gcc.dg/torture/vshuf-v32qi.c. It will check if the pattern is correct
> or not.
> Resubmitting patch looks good as current mail thread is already too complicated.
>
> On Wed, Sep 17, 2014 at 6:49 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
>> On Wed, Sep 17, 2014 at 6:01 AM, Evgeny Stupachenko <evstupac@gmail.com> wrote:
>>> It fix "gcc.target/i386/pr52252-atom.c" in core-avx2 make check and pr62128.
>>>
>>
>> I suggest you resubmit the patch as a bug fix for pr62128 with
>> testcases from  pr62128 as well as gcc.target/i386/pr52252-atom.c.
>>
>>
>> --
>> H.J.
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