On 2/24/20 11:34 PM, Robert Hoo wrote:
> Considering the length's dependency on sse2/sse4/avx2/avx512 and the
> algorithms, as well as future's possible changes, additions, I'd rather
> roll back to your original suggestion, use a companion variable with
> each accel_fn(). How do you like it?
How
On Mon, 2020-02-24 at 08:13 -0800, Richard Henderson wrote:
> On 2/23/20 11:07 PM, Robert Hoo wrote:
> > Inspired by your suggestion, I'm thinking go further: use immediate
> > rather than a global variable, so that saves 1 memory(/cache)
> > access.
> >
> > #ifdef CONFIG_AVX512F_OPT
> > #defi
On 2/23/20 11:07 PM, Robert Hoo wrote:
> Inspired by your suggestion, I'm thinking go further: use immediate
> rather than a global variable, so that saves 1 memory(/cache) access.
>
> #ifdef CONFIG_AVX512F_OPT
> #define OPTIMIZE_LEN256
> #else
> #define OPTIMIZE_LEN64
> #endif
With t
Thanks Richard:-)
Sorry for late reply.
On Thu, 2020-02-13 at 10:20 -0800, Richard Henderson wrote:
> On 2/12/20 11:52 PM, Robert Hoo wrote:
> > And initialize buffer_is_zero() with it, when Intel AVX512F is
> > available on host.
> >
> > This function utilizes Intel AVX512 fundamental instruction
On 2/12/20 11:52 PM, Robert Hoo wrote:
> And initialize buffer_is_zero() with it, when Intel AVX512F is
> available on host.
>
> This function utilizes Intel AVX512 fundamental instructions which
> perform over previous AVX2 instructions.
Is it not still true that any AVX512 insn will cause the e
On Thu, 2020-02-13 at 11:30 +0100, Paolo Bonzini wrote:
> On 13/02/20 08:52, Robert Hoo wrote:
> > +
> > +}
> > +#pragma GCC pop_options
> > +#endif
> > +
> > +
> > /* Note that for test_buffer_is_zero_next_accel, the most
> > preferred
> > * ISA must have the least significant bit.
> > */
> >
On 13/02/20 08:52, Robert Hoo wrote:
> +
> +}
> +#pragma GCC pop_options
> +#endif
> +
> +
> /* Note that for test_buffer_is_zero_next_accel, the most preferred
> * ISA must have the least significant bit.
> */
> -#define CACHE_AVX21
> -#define CACHE_SSE42
> -#define CACHE_SSE24
>
And initialize buffer_is_zero() with it, when Intel AVX512F is
available on host.
This function utilizes Intel AVX512 fundamental instructions which
perform over previous AVX2 instructions.
Signed-off-by: Robert Hoo
---
include/qemu/cpuid.h | 3 +++
util/bufferiszero.c | 56 ++
