[dpdk-stable] [PATCH v2] build: enable Arm NEON flags when __aarch64__ is defined

[Honnappa Nagarahalli]

-----Original Message-----
From: Yongseok Koh <yskoh at mellanox.com> 
Sent: Sunday, September 2, 2018 2:30 PM
To: Honnappa Nagarahalli <Honnappa.Nagarahalli at arm.com>
Cc: stable at dpdk.org
Subject: Re: [dpdk-stable] [PATCH v2] build: enable Arm NEON flags when __aarch64__ is defined


Hi,



Thanks,
Yongseok

> On Sep 2, 2018, at 11:32 AM, Honnappa Nagarahalli <Honnappa.Nagarahalli at arm.com> wrote:
> 
> GCC version 4.8.5 does not pre-define __ARM_NEON. NEON is not optional 
> for ArmV8. Hence NEON related code can be enabled when __aarch64__ is 
> defined.
> 
> Bugzilla ID: 82
> Cc: stable at dpdk.org
> 
> Reported-by: Raslan Darawsheh <rasland at mellanox.com>
> Reported-by: Thomas F Herbert <therbert at redhat.com>
> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> Reviewed-by: Phil Yang <phil.yang at arm.com>
> Reviewed-by: Gavin Hu <gavin.hu at arm.com>
> Acked-by: Gavin Hu <gavin.hu at arm.com>
> Acked-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
> ---
> V2:
> * Corrected the order of contribution tags
> * Added Jerin's Ack

I didn't check out the details yet but a quick question.
Do you want me to include this patch in 17.11.4?

Yes, please include.

Thanks,
Yongseok

> config/arm/meson.build | 3 ++-
> mk/rte.cpuflags.mk     | 2 +-
> 2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/config/arm/meson.build b/config/arm/meson.build index 
> 40dbc87..94cca49 100644
> --- a/config/arm/meson.build
> +++ b/config/arm/meson.build
> @@ -157,7 +157,8 @@ else
> endif
> message(machine_args)
> 
> -if cc.get_define('__ARM_NEON', args: machine_args) != ''
> +if (cc.get_define('__ARM_NEON', args: machine_args) != '' or
> +    cc.get_define('__aarch64__', args: machine_args) != '')
> 	dpdk_conf.set('RTE_MACHINE_CPUFLAG_NEON', 1)
> 	compile_time_cpuflags += ['RTE_CPUFLAG_NEON'] endif diff --git 
> a/mk/rte.cpuflags.mk b/mk/rte.cpuflags.mk index 6071313..43ed841 
> 100644
> --- a/mk/rte.cpuflags.mk
> +++ b/mk/rte.cpuflags.mk
> @@ -89,7 +89,7 @@ CPUFLAGS += VSX
> endif
> 
> # ARM flags
> -ifneq ($(filter $(AUTO_CPUFLAGS),__ARM_NEON),)
> +ifneq ($(filter __ARM_NEON __aarch64__,$(AUTO_CPUFLAGS)),)
> CPUFLAGS += NEON
> endif
> 
> --
> 2.7.4
>