Re: [ARM] Implement division using vrecpe, vrecps

[Prathamesh Kulkarni <prathamesh dot kulkarni at linaro dot org>]

On Fri, 26 Oct 2018 at 10:34, Prathamesh Kulkarni
<prathamesh.kulkarni@linaro.org> wrote:
>
> Hi,
> This is a rebased version of patch that adds a pattern to neon.md for
> implementing division with multiplication by reciprocal using
> vrecpe/vrecps with -funsafe-math-optimizations excluding -Os.
> The newly added test-cases are not vectorized on armeb target with
> -O2. I posted the analysis for that here:
> https://gcc.gnu.org/ml/gcc-patches/2016-05/msg01765.html
>
> Briefly, the difference between little and big-endian vectorizer is in
> arm_builtin_support_vector_misalignment() which calls
> default_builtin_support_vector_misalignment() for big-endian case, and
> that returns false because
> movmisalign_optab does not exist for V2SF mode. This isn't observed
> with -O3 because loop peeling for alignment gets enabled.
>
> It seems that the test cases in patch appear unsupported on armeb,
> after r221677 thus this patch requires no changes to
> target-supports.exp to adjust for armeb (unlike last time which
> stalled the patch).
>
> Bootstrap+tested on arm-linux-gnueabihf.
> Cross-tested on arm*-*-* variants.
> OK for trunk ?
ping: https://gcc.gnu.org/ml/gcc-patches/2018-10/msg01645.html

Thanks,
Prathamesh
>
> Thanks,
> Prathamesh