Re: [PATCH v2 03/12] target/ppc: Move V(ADD|SUB)CUW to decodetree and use gvec

[Richard Henderson <richard.henderson@linaro.org>]

On 10/10/22 12:13, Lucas Mateus Castro(alqotel) wrote:
> From: "Lucas Mateus Castro (alqotel)"<lucas.araujo@eldorado.org.br>
> 
> This patch moves VADDCUW and VSUBCUW to decodtree with gvec using an
> implementation based on the helper, with the main difference being
> changing the -1 (aka all bits set to 1) result returned by cmp when
> true to +1. It also implemented a .fni4 version of those instructions
> and dropped the helper.
> 
> vaddcuw:
> rept    loop    master             patch
> 8       12500   0,01008200         0,00612400 (-39.3%)
> 25      4000    0,01091500         0,00471600 (-56.8%)
> 100     1000    0,01332500         0,00593700 (-55.4%)
> 500     200     0,01998500         0,01275700 (-36.2%)
> 2500    40      0,04704300         0,04364300 (-7.2%)
> 8000    12      0,10748200         0,11241000 (+4.6%)
> 
> vsubcuw:
> rept    loop    master             patch
> 8       12500   0,01226200         0,00571600 (-53.4%)
> 25      4000    0,01493500         0,00462100 (-69.1%)
> 100     1000    0,01522700         0,00455100 (-70.1%)
> 500     200     0,02384600         0,01133500 (-52.5%)
> 2500    40      0,04935200         0,03178100 (-35.6%)
> 8000    12      0,09039900         0,09440600 (+4.4%)
> 
> Overall there was a gain in performance, but the TCGop code was still
> slightly bigger in the new version (it went from 4 to 5).
> 
> Signed-off-by: Lucas Mateus Castro (alqotel)<lucas.araujo@eldorado.org.br>
> ---
>   target/ppc/helper.h                 |  2 -
>   target/ppc/insn32.decode            |  2 +
>   target/ppc/int_helper.c             | 18 ---------
>   target/ppc/translate/vmx-impl.c.inc | 61 +++++++++++++++++++++++++++--
>   target/ppc/translate/vmx-ops.c.inc  |  3 +-
>   5 files changed, 60 insertions(+), 26 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~