[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 7:00 PM
To: Honnappa Nagarahalli <Honnappa.Nagarahalli at arm.com>
Cc: stable at dpdk.org; nd <nd at arm.com>
Subject: Re: [dpdk-stable] [PATCH v2] build: enable Arm NEON flags when __aarch64__ is defined

> On Sep 2, 2018, at 12:59 PM, Honnappa Nagarahalli <Honnappa.Nagarahalli at arm.com> wrote:
> 
> -----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
> 
>> 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.

I didn't realized that this is fixing the meson build.
17.11 doesn't have that.

Thanks,
Yongseok

It has a fix for the make build as well. Does it mean, it needs to be a different patch?

>> 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
>> 
>