Re: [Qemu-devel] [RFC PATCH v1 2/2] target-arm: Use Neon for zero checking

[Peter Maydell]

On 4 April 2016 at 14:39,  <address@hidden> wrote:
> From: Vijay <address@hidden>
>
> Use Neon instructions to perform zero checking of
> buffer. This is helps in reducing downtime during
> live migration.

One other comment I forgot:

> +#define NEON_VECTYPE               uint64x2_t

This is a 128-bit type...

> +static size_t buffer_find_nonzero_offset_neon(const void *buf, size_t len)
> +{
> +    size_t i;
> +    NEON_VECTYPE d0, d1, d2, d3, d4, d5, d6;
> +    NEON_VECTYPE d7, d8, d9, d10, d11, d12, d13, d14;

...so it's a bit confusing to use d0, d1, etc, which implies
a 64-bit value.

thanks
-- PMM