[AArch64] Initial -mcpu=ares tuning

Hi all,

This patch adds a tuning struct for the Arm Ares CPU and uses it for -m{cpu,tune}=ares.
The tunings are an initial attempt and may be improved upon in the future, but they serve
as a decent starting point for GCC 9.

With this I see a 1.3% improvement on SPEC2006 int and 0.3% on SPEC2006 fp with -mcpu=ares.
On SPEC2017 I see a 0.6% improvement in intrate and changes in the noise for fprate.

Bootstrapped and tested on aarch64-none-linux-gnu.

Ok for trunk?
Thanks,
Kyrill

2019-01-15  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * config/aarch64/aarch64.c (ares_tunings): Define.
     * config/aarch64/aarch64-cores.def (ares): Use the above.

On 15/01/2019 15:28, Kyrill Tkachov wrote:
> Hi all,
> 
> This patch adds a tuning struct for the Arm Ares CPU and uses it for
> -m{cpu,tune}=ares.
> The tunings are an initial attempt and may be improved upon in the
> future, but they serve
> as a decent starting point for GCC 9.
> 
> With this I see a 1.3% improvement on SPEC2006 int and 0.3% on SPEC2006
> fp with -mcpu=ares.
> On SPEC2017 I see a 0.6% improvement in intrate and changes in the noise
> for fprate.
> 
> Bootstrapped and tested on aarch64-none-linux-gnu.
> 
> Ok for trunk?

OK.

R.

> Thanks,
> Kyrill
> 
> 2019-01-15  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
> 
>     * config/aarch64/aarch64.c (ares_tunings): Define.
>     * config/aarch64/aarch64-cores.def (ares): Use the above.
> 
> ares-tuning.patch
> 
> diff --git a/gcc/config/aarch64/aarch64-cores.def b/gcc/config/aarch64/aarch64-cores.def
> index 70b076694d9901ccf15bfd26c950b6466d3d1cc2..7c4bd52049e5ae33241acce37414da91abaa989c 100644
> --- a/gcc/config/aarch64/aarch64-cores.def
> +++ b/gcc/config/aarch64/aarch64-cores.def
> @@ -100,7 +100,7 @@ AARCH64_CORE("thunderx2t99",  thunderx2t99,  thunderx2t99, 8_1A,  AARCH64_FL_FOR
>  AARCH64_CORE("cortex-a55",  cortexa55, cortexa53, 8_2A,  AARCH64_FL_FOR_ARCH8_2 | AARCH64_FL_F16 | AARCH64_FL_RCPC | AARCH64_FL_DOTPROD, cortexa53, 0x41, 0xd05, -1)
>  AARCH64_CORE("cortex-a75",  cortexa75, cortexa57, 8_2A,  AARCH64_FL_FOR_ARCH8_2 | AARCH64_FL_F16 | AARCH64_FL_RCPC | AARCH64_FL_DOTPROD, cortexa73, 0x41, 0xd0a, -1)
>  AARCH64_CORE("cortex-a76",  cortexa76, cortexa57, 8_2A,  AARCH64_FL_FOR_ARCH8_2 | AARCH64_FL_F16 | AARCH64_FL_RCPC | AARCH64_FL_DOTPROD, cortexa72, 0x41, 0xd0b, -1)
> -AARCH64_CORE("ares",  ares, cortexa57, 8_2A,  AARCH64_FL_FOR_ARCH8_2 | AARCH64_FL_F16 | AARCH64_FL_RCPC | AARCH64_FL_DOTPROD | AARCH64_FL_PROFILE, cortexa72, 0x41, 0xd0c, -1)
> +AARCH64_CORE("ares",  ares, cortexa57, 8_2A,  AARCH64_FL_FOR_ARCH8_2 | AARCH64_FL_F16 | AARCH64_FL_RCPC | AARCH64_FL_DOTPROD | AARCH64_FL_PROFILE, ares, 0x41, 0xd0c, -1)
>  
>  /* HiSilicon ('H') cores. */
>  AARCH64_CORE("tsv110",  tsv110, cortexa57, 8_2A,  AARCH64_FL_FOR_ARCH8_2 | AARCH64_FL_CRYPTO | AARCH64_FL_F16 | AARCH64_FL_AES | AARCH64_FL_SHA2, tsv110,   0x48, 0xd01, -1)
> diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
> index 2fd6bb9821a256eaa2acaee305926b4efebf9c8c..b1e5eacb69728741517e313b110ebbc203d415a4 100644
> --- a/gcc/config/aarch64/aarch64.c
> +++ b/gcc/config/aarch64/aarch64.c
> @@ -1083,6 +1083,32 @@ static const struct tune_params thunderx2t99_tunings =
>    &thunderx2t99_prefetch_tune
>  };
>  
> +static const struct tune_params ares_tunings =
> +{
> +  &cortexa57_extra_costs,
> +  &generic_addrcost_table,
> +  &generic_regmove_cost,
> +  &cortexa57_vector_cost,
> +  &generic_branch_cost,
> +  &generic_approx_modes,
> +  SVE_NOT_IMPLEMENTED, /* sve_width  */
> +  4, /* memmov_cost  */
> +  3, /* issue_rate  */
> +  AARCH64_FUSE_AES_AESMC, /* fusible_ops  */
> +  "32:16",	/* function_align.  */
> +  "32:16",	/* jump_align.  */
> +  "32:16",	/* loop_align.  */
> +  2,	/* int_reassoc_width.  */
> +  4,	/* fp_reassoc_width.  */
> +  2,	/* vec_reassoc_width.  */
> +  2,	/* min_div_recip_mul_sf.  */
> +  2,	/* min_div_recip_mul_df.  */
> +  0,	/* max_case_values.  */
> +  tune_params::AUTOPREFETCHER_WEAK,	/* autoprefetcher_model.  */
> +  (AARCH64_EXTRA_TUNE_NONE),	/* tune_flags.  */
> +  &generic_prefetch_tune
> +};
> +
>  /* Support for fine-grained override of the tuning structures.  */
>  struct aarch64_tuning_override_function
>  {
>