From: Pavan Nikhilesh Bhagavatula <pbhagavatula@marvell.com>
To: Yoan Picchi <yoan.picchi@arm.com>,
Yipeng Wang <yipeng1.wang@intel.com>,
Sameh Gobriel <sameh.gobriel@intel.com>,
Bruce Richardson <bruce.richardson@intel.com>,
Vladimir Medvedkin <vladimir.medvedkin@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>, "nd@arm.com" <nd@arm.com>,
Ruifeng Wang <ruifeng.wang@arm.com>,
Nathan Brown <nathan.brown@arm.com>,
Jerin Jacob <jerinj@marvell.com>
Subject: RE: [EXTERNAL] [PATCH v7 2/4] hash: optimize compare signature for NEON
Date: Wed, 20 Mar 2024 07:37:47 +0000 [thread overview]
Message-ID: <PH0PR18MB408670D0ECB88BEFE5A750EADE332@PH0PR18MB4086.namprd18.prod.outlook.com> (raw)
In-Reply-To: <20240312154215.802374-3-yoan.picchi@arm.com>
> Upon a successful comparison, NEON sets all the bits in the lane to 1
> We can skip shifting by simply masking with specific masks.
>
> Signed-off-by: Yoan Picchi <yoan.picchi@arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> Reviewed-by: Nathan Brown <nathan.brown@arm.com>
> ---
> lib/hash/arch/arm/compare_signatures.h | 24 +++++++++++-------------
> 1 file changed, 11 insertions(+), 13 deletions(-)
>
> diff --git a/lib/hash/arch/arm/compare_signatures.h
> b/lib/hash/arch/arm/compare_signatures.h
> index 1af6ba8190..b5a457f936 100644
> --- a/lib/hash/arch/arm/compare_signatures.h
> +++ b/lib/hash/arch/arm/compare_signatures.h
> @@ -30,23 +30,21 @@ compare_signatures_dense(uint16_t
> *hitmask_buffer,
> switch (sig_cmp_fn) {
> #if RTE_HASH_BUCKET_ENTRIES <= 8
> case RTE_HASH_COMPARE_NEON: {
> - uint16x8_t vmat, vsig, x;
> - int16x8_t shift = {0, 1, 2, 3, 4, 5, 6, 7};
> - uint16_t low, high;
> + uint16x8_t vmat, hit1, hit2;
> + const uint16x8_t mask = {0x1, 0x2, 0x4, 0x8, 0x10, 0x20,
> 0x40, 0x80};
> + const uint16x8_t vsig = vld1q_dup_u16((uint16_t const
> *)&sig);
>
> - vsig = vld1q_dup_u16((uint16_t const *)&sig);
> /* Compare all signatures in the primary bucket */
> - vmat = vceqq_u16(vsig,
> - vld1q_u16((uint16_t const *)prim_bucket_sigs));
> - x = vshlq_u16(vandq_u16(vmat, vdupq_n_u16(0x0001)),
> shift);
> - low = (uint16_t)(vaddvq_u16(x));
> + vmat = vceqq_u16(vsig, vld1q_u16(prim_bucket_sigs));
> + hit1 = vandq_u16(vmat, mask);
> +
> /* Compare all signatures in the secondary bucket */
> - vmat = vceqq_u16(vsig,
> - vld1q_u16((uint16_t const *)sec_bucket_sigs));
> - x = vshlq_u16(vandq_u16(vmat, vdupq_n_u16(0x0001)),
> shift);
> - high = (uint16_t)(vaddvq_u16(x));
> - *hitmask_buffer = low | high << RTE_HASH_BUCKET_ENTRIES;
> + vmat = vceqq_u16(vsig, vld1q_u16(sec_bucket_sigs));
> + hit2 = vandq_u16(vmat, mask);
>
> + hit2 = vshlq_n_u16(hit2, RTE_HASH_BUCKET_ENTRIES);
> + hit2 = vorrq_u16(hit1, hit2);
> + *hitmask_buffer = vaddvq_u16(hit2);
Since vaddv is expensive could you convert it to vshrn?
https://community.arm.com/arm-community-blogs/b/infrastructure-solutions-blog/posts/porting-x86-vector-bitmask-optimizations-to-arm-neon
https://github.com/DPDK/dpdk/blob/main/examples/l3fwd/l3fwd_neon.h#L226
> }
> break;
> #endif
> --
> 2.25.1
next prev parent reply other threads:[~2024-03-20 7:39 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-20 16:51 [PATCH v2 0/4] hash: add SVE support for bulk key lookup Yoan Picchi
2023-10-20 16:51 ` [PATCH v2 1/4] hash: pack the hitmask for hash in bulk lookup Yoan Picchi
2023-10-20 16:51 ` [PATCH v2 2/4] hash: optimize compare signature for NEON Yoan Picchi
2023-10-20 16:51 ` [PATCH v2 3/4] test/hash: check bulk lookup of keys after collision Yoan Picchi
2023-10-20 16:51 ` [PATCH v2 4/4] hash: add SVE support for bulk key lookup Yoan Picchi
2024-02-27 17:41 ` [PATCH v5 0/4] " Yoan Picchi
2024-02-27 17:42 ` [PATCH v5 1/4] hash: pack the hitmask for hash in bulk lookup Yoan Picchi
2024-02-27 17:42 ` [PATCH v5 2/4] hash: optimize compare signature for NEON Yoan Picchi
2024-02-27 17:42 ` [PATCH v5 3/4] test/hash: check bulk lookup of keys after collision Yoan Picchi
2024-02-27 17:42 ` [PATCH v5 4/4] hash: add SVE support for bulk key lookup Yoan Picchi
2024-02-28 10:56 ` Konstantin Ananyev
2024-02-28 14:48 ` Yoan Picchi
2024-03-04 13:35 ` Konstantin Ananyev
2024-03-05 15:36 ` Yoan Picchi
2024-03-11 23:21 ` [PATCH v6 0/4] " Yoan Picchi
2024-03-11 23:21 ` [PATCH v6 1/4] hash: pack the hitmask for hash in bulk lookup Yoan Picchi
2024-03-11 23:21 ` [PATCH v6 2/4] hash: optimize compare signature for NEON Yoan Picchi
2024-03-11 23:21 ` [PATCH v6 3/4] test/hash: check bulk lookup of keys after collision Yoan Picchi
2024-03-11 23:21 ` [PATCH v6 4/4] hash: add SVE support for bulk key lookup Yoan Picchi
2024-03-12 3:57 ` fengchengwen
2024-03-12 15:08 ` Yoan Picchi
2024-03-12 15:42 ` [PATCH v7 0/4] " Yoan Picchi
2024-03-12 15:42 ` [PATCH v7 1/4] hash: pack the hitmask for hash in bulk lookup Yoan Picchi
2024-03-19 10:41 ` Konstantin Ananyev
2024-03-19 13:09 ` Yoan Picchi
2024-03-19 13:25 ` Konstantin Ananyev
2024-03-19 16:09 ` Stephen Hemminger
2024-03-12 15:42 ` [PATCH v7 2/4] hash: optimize compare signature for NEON Yoan Picchi
2024-03-20 7:37 ` Pavan Nikhilesh Bhagavatula [this message]
2024-04-11 13:32 ` [EXTERNAL] " Yoan Picchi
2024-03-12 15:42 ` [PATCH v7 3/4] test/hash: check bulk lookup of keys after collision Yoan Picchi
2024-03-12 15:42 ` [PATCH v7 4/4] hash: add SVE support for bulk key lookup Yoan Picchi
2024-04-17 16:08 ` [PATCH v8 0/4] " Yoan Picchi
2024-04-17 16:08 ` [PATCH v8 1/4] hash: pack the hitmask for hash in bulk lookup Yoan Picchi
2024-04-17 18:12 ` Stephen Hemminger
2024-04-17 16:08 ` [PATCH v8 2/4] hash: optimize compare signature for NEON Yoan Picchi
2024-04-17 16:08 ` [PATCH v8 3/4] test/hash: check bulk lookup of keys after collision Yoan Picchi
2024-04-17 16:08 ` [PATCH v8 4/4] hash: add SVE support for bulk key lookup Yoan Picchi
2024-04-30 16:27 ` [PATCH v9 0/4] " Yoan Picchi
2024-04-30 16:27 ` [PATCH v9 1/4] hash: pack the hitmask for hash in bulk lookup Yoan Picchi
2024-04-30 16:27 ` [PATCH v9 2/4] hash: optimize compare signature for NEON Yoan Picchi
2024-04-30 16:27 ` [PATCH v9 3/4] test/hash: check bulk lookup of keys after collision Yoan Picchi
2024-04-30 16:27 ` [PATCH v9 4/4] hash: add SVE support for bulk key lookup Yoan Picchi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=PH0PR18MB408670D0ECB88BEFE5A750EADE332@PH0PR18MB4086.namprd18.prod.outlook.com \
--to=pbhagavatula@marvell.com \
--cc=bruce.richardson@intel.com \
--cc=dev@dpdk.org \
--cc=jerinj@marvell.com \
--cc=nathan.brown@arm.com \
--cc=nd@arm.com \
--cc=ruifeng.wang@arm.com \
--cc=sameh.gobriel@intel.com \
--cc=vladimir.medvedkin@intel.com \
--cc=yipeng1.wang@intel.com \
--cc=yoan.picchi@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).