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Wed, 10 Jun 2026 17:25:24 +0000 (GMT) Received: from [9.47.158.153] (unknown [9.47.158.153]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Wed, 10 Jun 2026 17:25:24 +0000 (GMT) Message-ID: <37806a6a-1dd9-478f-aa93-02d231fc0d40@linux.ibm.com> Date: Wed, 10 Jun 2026 13:25:24 -0400 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] crypto: ecc - Optimize vli additive operations using compiler builtins To: Fabian Blatter , lukas@wunner.de, ignat@linux.win, herbert@gondor.apana.org.au, davem@davemloft.net Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260607112435.42804-1-fabianblatter09@gmail.com> Content-Language: en-US From: Stefan Berger In-Reply-To: <20260607112435.42804-1-fabianblatter09@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=HppG3UTS c=1 sm=1 tr=0 ts=6a299e07 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=EG7EwXfyWvgXmjHjImMA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: 3fZ4yJRtnBf69MoCCNgpnikWI_N1cYUB X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjEwMDE2MSBTYWx0ZWRfX/I7u9/bZD7Vm TGJujjbV8F4phtWuUnwa9EFVP+bKbJ/F8Ukky3EyK44YTK7ssunxhfUd5KiiyIb10rlaY1GidSp PgHEma4r/tBDni1VBAQJk/mZlbnRuuicRGpynagsifA5spCDzuk8er9ENyCwpy7bdVBPx9UQnwa DLD7AVqMpFELsvipjtYUBf/YWFdAMTMskb95xJp5bsSn0eEAT1sjuw0i8i01lxAPvbtV2u5yb9j j/3MsKFw+rBkhV5BNdrXV7jVIu0UHCKJrr8viEEjLL1hxfWpcViaeCBu0y6XBfPqaUVvOAY5E1X tMa8rR/7q/aMkk7oTgMdUbfdnFci6HFybZ0/csmpvRjKCOlUSz0MwP1cl9alGUG/69r2L7Kk03y zxFoJW8aCYpAP4O+Y9oiY9kxdXhrszjzOjedQcgCxHAZ7KkuZlbgtp509qyEBmpb9h01UlK9bEy wBaysFzwXG8frECAn3Q== X-Proofpoint-ORIG-GUID: ZJe6tdlrdt0UWyRE3zNXBBVECiZNQNjB X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-10_03,2026-06-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 phishscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 clxscore=1015 bulkscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606100161 On 6/7/26 7:24 AM, Fabian Blatter wrote: > Replace the software carry flag emulation with compiler builtins. > > Even the newest compilers struggle with taking advantage of the > hardware carry flag. Compiler builtins allow the compiler to > much more easily achieve this while still remaining constant-time. > > This yields an approximately 6-7% performance improvement > on the ecc_gen_privkey, ecc_make_pub_key and crypto_ecdh_shared_secret > functions on x86_64 on all curve sizes. > > Additionally, the code becomes much more readable. > > Signed-off-by: Fabian Blatter Reviewed-by: Stefan Berger