From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 992B3431E0; Mon, 23 Oct 2023 10:55:15 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 1C70340DF6; Mon, 23 Oct 2023 10:55:06 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mails.dpdk.org (Postfix) with ESMTP id B4158402A2 for ; Fri, 20 Oct 2023 18:53:02 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1BB29153B; Fri, 20 Oct 2023 09:53:43 -0700 (PDT) Received: from ampere-altra-2-2.usa.Arm.com (unknown [10.118.91.160]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 246233F5A1; Fri, 20 Oct 2023 09:53:02 -0700 (PDT) From: Yoan Picchi To: Yipeng Wang , Sameh Gobriel , Bruce Richardson , Vladimir Medvedkin Cc: dev@dpdk.org, Yoan Picchi Subject: [PATCH v2 2/4] hash: optimize compare signature for NEON Date: Fri, 20 Oct 2023 16:51:57 +0000 Message-Id: <20231020165159.1649282-3-yoan.picchi@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231020165159.1649282-1-yoan.picchi@arm.com> References: <20231020165159.1649282-1-yoan.picchi@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Mon, 23 Oct 2023 10:55:02 +0200 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org 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 --- lib/hash/rte_cuckoo_hash.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-) diff --git a/lib/hash/rte_cuckoo_hash.c b/lib/hash/rte_cuckoo_hash.c index 2aa96eb862..a4b907c45c 100644 --- a/lib/hash/rte_cuckoo_hash.c +++ b/lib/hash/rte_cuckoo_hash.c @@ -1864,19 +1864,17 @@ compare_signatures_dense(uint32_t *prim_hash_matches, uint32_t *sec_hash_matches /* For match mask every bits indicates the match */ switch (sig_cmp_fn) { case RTE_HASH_COMPARE_NEON: { - uint16x8_t vmat, vsig, x; - int16x8_t shift = {0, 1, 2, 3, 4, 5, 6, 7}; + uint16x8_t vmat, x; + 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_bkt->sig_current)); - x = vshlq_u16(vandq_u16(vmat, vdupq_n_u16(0x0001)), shift); + vmat = vceqq_u16(vsig, vld1q_u16((uint16_t const *)prim_bkt->sig_current)); + x = vandq_u16(vmat, mask); *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(0x0001)), shift); + vmat = vceqq_u16(vsig, vld1q_u16((uint16_t const *)sec_bkt->sig_current)); + x = vandq_u16(vmat, mask); *sec_hash_matches = (uint32_t)(vaddvq_u16(x)); } break; -- 2.25.1