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Date: Mon, 22 Sep 2014 10:42:00 -0000
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Subject: Re: [PATCH 8/14][Testsuite] Add tests of reductions using whole-vector-shifts (ior)
From: Richard Biener <richard.guenther@gmail.com>
To: Alan Lawrence <alan.lawrence@arm.com>
Cc: "gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
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On Thu, Sep 18, 2014 at 2:25 PM, Alan Lawrence <alan.lawrence@arm.com> wrote:
> These are like the previous patch, but using | rather than * - I was unable
> to get the previous test to pass on PowerPC and MIPS.
>
> I note there is no inherent vector operation here - a bitwise OR across a
> word, and a "reduction via shifts" using scalar (not vector) ops would be
> all that's necessary. However, GCC doesn't exploit this possibility at
> present, and I don't have any plans at present to add such myself.
>
> Passing on x86_64-linux-gnu, aarch64-none-elf, aarch64_be-none-elf,
> arm-none-eabi.
> The 'scan-tree-dump' part passes on mips64 and powerpc (although the latter
> is disabled as check_effective_target_whole_vector_shift gives 0, as per
> previous patch)

Ok.

Thanks,
Richard.

> gcc/testsuite/ChangeLog:
>
>         * gcc.dg/vect/vect-reduc-or_1.c: New test.
>         * gcc.dg/vect/vect-reduc-or_2.c: Likewise.