Re: [dpdk-dev] [PATCH] build: enable Arm NEON flags when __aarch64__ is defined

[Gavin Hu <Gavin.Hu@arm.com>]

> -----Original Message-----
> From: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> Sent: Wednesday, August 22, 2018 11:01 PM
> To: bruce.richardson@intel.com
> Cc: dev@dpdk.org; Gavin Hu <Gavin.Hu@arm.com>; rasland@mellanox.com;
> therbert@redhat.com; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>
> Subject: [PATCH] build: enable Arm NEON flags when __aarch64__ is defined
> 
> 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
> 
> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> Reviewed-by: Phil Yang <phil.yang@arm.com>
> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
> Reported-by: Raslan Darawsheh <rasland@mellanox.com>
> Reported-by: Thomas F Herbert <therbert@redhat.com>
Acked-by: Gavin Hu <gavin.hu@arm.com>
> ---
>  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
> 40dbc87f7..94cca490e 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 60713137d..43ed84155
> 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
> 
> --
> 2.17.1