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 CE38343E94; Wed, 17 Apr 2024 18:08:35 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 94D5440EA5; Wed, 17 Apr 2024 18:08:31 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mails.dpdk.org (Postfix) with ESMTP id 478E74003C for ; Wed, 17 Apr 2024 18:08:29 +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 8F7651477; Wed, 17 Apr 2024 09:08:56 -0700 (PDT) Received: from octeon10-1.usa.Arm.com (unknown [10.118.91.161]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7D91E3F7F4; Wed, 17 Apr 2024 09:08:28 -0700 (PDT) From: Yoan Picchi To: Yipeng Wang , Sameh Gobriel , Bruce Richardson , Vladimir Medvedkin Cc: dev@dpdk.org, nd@arm.com, Yoan Picchi , Ruifeng Wang , Nathan Brown Subject: [PATCH v8 2/4] hash: optimize compare signature for NEON Date: Wed, 17 Apr 2024 16:08:05 +0000 Message-Id: <20240417160807.1249480-3-yoan.picchi@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240417160807.1249480-1-yoan.picchi@arm.com> References: <20231020165159.1649282-1-yoan.picchi@arm.com> <20240417160807.1249480-1-yoan.picchi@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Ruifeng Wang Reviewed-by: Nathan Brown --- 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 63eb341d0e..2601ed68b3 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); } break; #endif -- 2.25.1