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 B21564687A; Wed, 4 Jun 2025 15:07:56 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id A349F42DD1; Wed, 4 Jun 2025 15:07:56 +0200 (CEST) Received: from out162-62-58-216.mail.qq.com (out162-62-58-216.mail.qq.com [162.62.58.216]) by mails.dpdk.org (Postfix) with UTF8SMTP id 1433442DCB for ; Wed, 4 Jun 2025 15:07:54 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foxmail.com; s=s201512; t=1749042462; bh=9jPVAJsdveFmvEIskdyTPeqaobb0rO9QjEji692N5jY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=NlImq0vjQPc4D/BmeBSFOLF8VrKNWNydCrF7KR/aam5b+ue4zTI0h6xufoVrFa+qH XJQANM2hffu8jGSI/Qc+I4nARZxEz4otMjseyoXmM3NqG1RGGj47mXtBAuF9hCvi9K iYnwy9zPEB+vDOnbGrv2fIYy9A0i1jsMd/N4ANog= Received: from localhost.localdomain ([116.139.97.45]) by newxmesmtplogicsvrszb20-0.qq.com (NewEsmtp) with SMTP id 1E909CDE; Wed, 04 Jun 2025 21:07:41 +0800 X-QQ-mid: xmsmtpt1749042461ty0fkrca1 Message-ID: X-QQ-XMAILINFO: OASTJNHpK0Kvx8VQBS4HeN2F5jZgWiRuBsjQXPOWeAnlsoIBu6vfhFAxXtRqMU WYnoRZWH+hFy2UJLgdZX97mvuvCXT1q/nmcrBzv6V2+8+FYc4Ro7iKU3Ns7dJXP2tmjqvf8W0Bpn 5kBehRQVlmGT4SwVfxi/dCCc5o77J+P2VYLq3reoSSctFqo8HOri22DGMecamCEm9DaGhdaVYEJ1 qUrmsYj51WZO2HZjKKBDP89RDoK2k+kCTnuuzUAyfG51RNe22//Z5ZuakEskYeF0l+3O3YY9kabN gJKgSZ1s2TyUUIIZi71esmf+DOGhP0ZJaTI4rN4qv8W7/VmelN86RqijVN4uNViNrfplPiHizK7A 8y9OqBB8jBqlhR3aTe1LhLCZTBFTTMm1wtAE4SJV+XgPRHWUmLKWf0O8ZtIYQLj8b73jNjPpg14i gEXjwoVmczWWtYjbpZ5DFDmO1Bop+rB5mSc1YXXT+puZl8aYMt5oKrtfr5O1jgsMWtw7STZxj55Z YXx+oU3baxKxHNozE1dPuAhqxsiXHFN0+VkNriWRxqmRESB8lWsF7p293nA1zmFaWNiuutdK1G0Z ZZ4796mvdzVYyaVISbLqNrNxsIVFklLJ54KNzwMIS0MEpm+j+LQc88Ge0wuesBNxhnhg5ikfhoCS jpBx2ahgP4+uh2YFcpN9brCpnIgXt1htNS41a0cZ4gk5o23JQ6V+ldQvUySBCDSVFL/V8MVXGxtB Wqx8p++ZVtzpEG6AtvGNkcx2J08ZyHKmRJt3M5B8R/kn5BaMpJ8Zg4v8kMDPP5uOgA2jvs4pqKlZ 3V7YulTZ6nQFmgkbwEvRzVsSSiH9fA4J547YYuqTVjUK6iSc+DWoZjHcY6xEvnNlI93pvkQnG4ax uu0IZHhOMWrbDLHAKESsWgpHbAi5rGwQjC0lyKAfXY7wJSwPq04fBHhULEnQPhigwbgGmPqklk07 llkKOBT2jxz/orxhCdQSjtixrmdLMA05wia1LvF+q/OGrjNWJY/Q== X-QQ-XMRINFO: MPJ6Tf5t3I/ycC2BItcBVIA= From: uk7b@foxmail.com To: dev@dpdk.org Cc: sunyuechi , Stanislaw Kardach , Bruce Richardson Subject: [PATCH v2 1/3] config/riscv: detect V extension Date: Wed, 4 Jun 2025 21:07:39 +0800 X-OQ-MSGID: <20250604130739.2347575-1-uk7b@foxmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: References: 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 From: sunyuechi This patch is derived from "config/riscv: detect presence of Zbc extension with modifications". The RISC-V C api defines architecture extension test macros These let us detect whether the V extension is supported on the compiler and -march we're building with. The C api also defines V intrinsics we can use rather than inline assembly on newer versions of GCC (14.1.0+) and Clang (18.1.0+). If the V extension and intrinsics are both present and we can detect the V extension at runtime, we define a flag, RTE_RISCV_FEATURE_V. Signed-off-by: sunyuechi --- config/riscv/meson.build | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/config/riscv/meson.build b/config/riscv/meson.build index 7562c6cb99..e3694cf2e6 100644 --- a/config/riscv/meson.build +++ b/config/riscv/meson.build @@ -119,6 +119,31 @@ foreach flag: arch_config['machine_args'] endif endforeach +# check if we can do buildtime detection of extensions supported by the target +riscv_extension_macros = false +if (cc.get_define('__riscv_arch_test', args: machine_args) == '1') + message('Detected architecture extension test macros') + riscv_extension_macros = true +else + warning('RISC-V architecture extension test macros not available. Build-time detection of extensions not possible') +endif + +# detect extensions +# Requires intrinsics available in GCC 14.1.0+ and Clang 18.1.0+ +if (riscv_extension_macros and + (cc.get_define('__riscv_vector', args: machine_args) != '')) + if ((cc.get_id() == 'gcc' and cc.version().version_compare('>=14.1.0')) + or (cc.get_id() == 'clang' and cc.version().version_compare('>=18.1.0'))) + if (cc.compiles('''#include + int main(void) { size_t vl = __riscv_vsetvl_e32m1(1); }''', args: machine_args)) + message('Compiling with the V extension') + machine_args += ['-DRTE_RISCV_FEATURE_V'] + endif + else + warning('Detected V extension but cannot use because intrinsics are not available (present in GCC 14.1.0+ and Clang 18.1.0+)') + endif +endif + # apply flags foreach flag: dpdk_flags if flag.length() > 0 -- 2.49.0