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Date: Sun, 16 Feb 2014 22:05:00 -0000
Message-ID: <CAGWvnynQEkd-eDMtgKU2D52cKFnZBbQO7QYSkdrijzdH3jVkZg@mail.gmail.com>
Subject: Re: [PATCH, rs6000] Provide little-endian support for vmrgew and vmrgow
From: David Edelsohn <dje.gcc@gmail.com>
To: Bill Schmidt <wschmidt@linux.vnet.ibm.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>
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X-SW-Source: 2014-02/txt/msg00977.txt.bz2

On Sun, Feb 16, 2014 at 12:19 PM, Bill Schmidt
<wschmidt@linux.vnet.ibm.com> wrote:
> Hi,
>
> With -mcpu=power8, we see two test cases (gcc.dg/vect/slp-perm-2.c and
> gcc.dg/vect/slp-perm-5.c) regress for powerpc64le-linux.  GCC makes use
> of some new Power8 instructions (vmrgew and vmrgow) which need
> adjustment for little endian targets.  As with merge-high and merge-low,
> we need to reverse the order of the input vectors and reverse the use of
> the "odd" and "even" instructions (since the change in element ordering
> changes which elements are odd and which are even).
>
> Bootstrapped and tested on powerpc64{,le}-unknown-linux-gnu with no
> regressions.  The failing tests now run to completion.  Is this ok for
> trunk?
>
> Thanks,
> Bill
>
>
> 2014-02-16  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
>
>         * config/rs6000/altivec.md (p8_vmrgew): Handle little endian
>         targets.
>         (p8_vmrgow): Likewise.

Okay.

Thanks, David