From: "Wilco Dijkstra" <wdijkstr@arm.com>
To: <gcc-patches@gcc.gnu.org>
Subject: RE: [PATCH][AArch64] Fix Cortex-A53 shift costs
Date: Mon, 27 Apr 2015 14:05:00 -0000 [thread overview]
Message-ID: <000601d080f3$27168560$75439020$@com> (raw)
In-Reply-To:
ping
> -----Original Message-----
> From: Wilco Dijkstra [mailto:wdijkstr@arm.com]
> Sent: 05 March 2015 14:49
> To: gcc-patches@gcc.gnu.org
> Subject: [PATCH][AArch64] Fix Cortex-A53 shift costs
>
> This patch fixes the shift costs for Cortex-A53 so they are more accurate - immediate shifts
> use SBFM/UBFM which takes 2 cycles, register controlled shifts take 1 cycle. Bootstrap and
> regression OK.
>
> ChangeLog:
> 2015-03-05 Wilco Dijkstra <wdijkstr@arm.com>
>
> * gcc/config/arm/aarch-cost-tables.h (cortexa53_extra_costs):
> Make Cortex-A53 shift costs more accurate.
>
> ---
> gcc/config/arm/aarch-cost-tables.h | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/gcc/config/arm/aarch-cost-tables.h b/gcc/config/arm/aarch-cost-tables.h
> index 05e96a9..6bb8ede 100644
> --- a/gcc/config/arm/aarch-cost-tables.h
> +++ b/gcc/config/arm/aarch-cost-tables.h
> @@ -130,12 +130,12 @@ const struct cpu_cost_table cortexa53_extra_costs =
> 0, /* arith. */
> 0, /* logical. */
> COSTS_N_INSNS (1), /* shift. */
> - COSTS_N_INSNS (2), /* shift_reg. */
> + 0, /* shift_reg. */
> COSTS_N_INSNS (1), /* arith_shift. */
> - COSTS_N_INSNS (2), /* arith_shift_reg. */
> + COSTS_N_INSNS (1), /* arith_shift_reg. */
> COSTS_N_INSNS (1), /* log_shift. */
> - COSTS_N_INSNS (2), /* log_shift_reg. */
> - 0, /* extend. */
> + COSTS_N_INSNS (1), /* log_shift_reg. */
> + COSTS_N_INSNS (1), /* extend. */
> COSTS_N_INSNS (1), /* extend_arith. */
> COSTS_N_INSNS (1), /* bfi. */
> COSTS_N_INSNS (1), /* bfx. */
> --
> 1.9.1
next reply other threads:[~2015-04-27 14:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-27 14:05 Wilco Dijkstra [this message]
-- strict thread matches above, loose matches on Subject: below --
2015-03-05 14:49 Wilco Dijkstra
[not found] ` <CAFqB+Pzsi73v5nVJgwuTFwp4rKGw0=Vj7YDW34KeV-G3V8ayOQ@mail.gmail.com>
2015-05-01 13:07 ` Wilco Dijkstra
2015-05-01 13:09 ` Kyrill Tkachov
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