From patchwork Mon Apr 29 10:02:07 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ruifeng Wang X-Patchwork-Id: 53142 X-Patchwork-Delegate: thomas@monjalon.net Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id DFC331B14D; Mon, 29 Apr 2019 12:02:57 +0200 (CEST) Received: from foss.arm.com (usa-sjc-mx-foss1.foss.arm.com [217.140.101.70]) by dpdk.org (Postfix) with ESMTP id 0F8F71B146 for ; Mon, 29 Apr 2019 12:02:56 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4DB6380D; Mon, 29 Apr 2019 03:02:55 -0700 (PDT) Received: from net-arm-c2400.shanghai.arm.com (net-arm-c2400.shanghai.arm.com [10.169.40.36]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id A79493F5AF; Mon, 29 Apr 2019 03:02:53 -0700 (PDT) From: Ruifeng Wang To: yipeng1.wang@intel.com, sameh.gobriel@intel.com, bruce.richardson@intel.com, pablo.de.lara.guarch@intel.com Cc: dev@dpdk.org, jerinj@marvell.com, Honnappa.Nagarahalli@arm.com, nd@arm.com, Ruifeng Wang Date: Mon, 29 Apr 2019 18:02:07 +0800 Message-Id: <1556532127-46557-1-git-send-email-ruifeng.wang@arm.com> X-Mailer: git-send-email 2.7.4 Subject: [dpdk-dev] [PATCH v1] hash: simplify signature compare neon process X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Replaced multiple neon instructions with single equivalent instruction. This made simpler code and a bit higher performance. Hash bulk lookup had 0.1% ~ 3% performance gain in tests on ARM A72 platforms. Signed-off-by: Ruifeng Wang Reviewed-by: Gavin Hu Acked-by: Yipeng Wang --- lib/librte_hash/rte_cuckoo_hash.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/lib/librte_hash/rte_cuckoo_hash.c b/lib/librte_hash/rte_cuckoo_hash.c index 261267b..f17819e 100644 --- a/lib/librte_hash/rte_cuckoo_hash.c +++ b/lib/librte_hash/rte_cuckoo_hash.c @@ -1656,7 +1656,6 @@ compare_signatures(uint32_t *prim_hash_matches, uint32_t *sec_hash_matches, #elif defined(RTE_MACHINE_CPUFLAG_NEON) case RTE_HASH_COMPARE_NEON: { uint16x8_t vmat, vsig, x; - uint64x2_t x64; int16x8_t shift = {-15, -13, -11, -9, -7, -5, -3, -1}; vsig = vld1q_dup_u16((uint16_t const *)&sig); @@ -1664,16 +1663,13 @@ compare_signatures(uint32_t *prim_hash_matches, uint32_t *sec_hash_matches, vmat = vceqq_u16(vsig, vld1q_u16((uint16_t const *)prim_bkt->sig_current)); x = vshlq_u16(vandq_u16(vmat, vdupq_n_u16(0x8000)), shift); - x64 = vpaddlq_u32(vpaddlq_u16(x)); - *prim_hash_matches = (uint32_t)(vgetq_lane_u64(x64, 0) + - vgetq_lane_u64(x64, 1)); + *prim_hash_matches = (uint32_t)(vaddvq_u16(x)); /* Compare all signatures in the secondary bucket */ vmat = vceqq_u16(vsig, vld1q_u16((uint16_t const *)sec_bkt->sig_current)); x = vshlq_u16(vandq_u16(vmat, vdupq_n_u16(0x8000)), shift); - x64 = vpaddlq_u32(vpaddlq_u16(x)); - *sec_hash_matches = (uint32_t)(vgetq_lane_u64(x64, 0) + - vgetq_lane_u64(x64, 1)); } + *sec_hash_matches = (uint32_t)(vaddvq_u16(x)); + } break; #endif default: