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 C76F24681E; Thu, 29 May 2025 11:56:18 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id EE0A7410D2; Thu, 29 May 2025 11:56:13 +0200 (CEST) Received: from out203-205-221-164.mail.qq.com (out203-205-221-164.mail.qq.com [203.205.221.164]) by mails.dpdk.org (Postfix) with UTF8SMTP id 65C6640156 for ; Wed, 28 May 2025 18:59:19 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foxmail.com; s=s201512; t=1748451553; bh=9jPVAJsdveFmvEIskdyTPeqaobb0rO9QjEji692N5jY=; h=From:To:Cc:Subject:Date; b=MueyThXQ2KVucj7MwKfhylj9/8Vbvxa88RzCOjsrQFFDvuz4Z0vFRN0BC3RnNHw+M LDwvIUCZfvZhHIaP7awCGOzpnyBSLWwt9Zt3w7Y01zBBGXEzQJ+nJCsAp+ow5vBsz3 rwwcTB7T+OhdeIq/4MBuwv/i8vj7IdXno9vGws5w= Received: from localhost.localdomain ([116.139.97.45]) by newxmesmtplogicsvrszgpua8-0.qq.com (NewEsmtp) with SMTP id ECB9A859; Thu, 29 May 2025 00:59:11 +0800 X-QQ-mid: xmsmtpt1748451551tm7dqx017 Message-ID: X-QQ-XMAILINFO: MW5hkHoBpWXyIdrtUW7Rs31oh5YTctM/MoGLM0obc8oPROj9rR4gx8bOZDeNoC EE3wXscrLrNWYfqJihRNEzC5Q3pPqufqTmSE81syqYoxZxw/KeMHk9jjxVoYOEOPNb+qYfPNou6u 9+0d5cPP9LK6+Pk1SB7WHodTKMFixZ5xcj7Xs0DQU0PCaZJt9Fn3MJzmzdKpqaPoI5PHblqhpIAG 5RPYVrsIbXxXgHg8KW3JmtZXWUVQpL434zPQwLhLJkNFOd5AQ4lv17cktev6fFKCDILHT2tCvfiJ GY+LPH+uzEPKX4QO+IKKhrYihB8Uxq/oUoh1tGXvb9yNCw+lPWP6yNkdxnjQaRuXq1pDfltVbp7b xtAj8dP+1Aq01r221iWxg7jgPSSgPfuHPovlIqGGgrFgvqe2RssCJBjXjnTjVhL08INDjukzhtxC KpO8blrcr/ttyaGqSduMbo0jFyfk8glsqaVIRTma59DOdYEMwjBYWT6e0xNQUi6WVTSCXFW2/O9U FkKgPZzbCDF0D4jdPYtwuT9cJzpx6wFAqnvD01dTl4TgWkgDRFV2xK8svQBJ/WSgqa1Ctqll7bu5 w4JbDoP2IHMRJp+yBTs928d9oqC9bjr0yd/IL6dV7t/kUaf6nzyosgXFXbCGxOaQzjZAOATkx4Jd KlOWdphc5gs0+pOYK0nx83VST6kQS370rXxpCmW2cxFvNnEHHsstkqxMT5vzBo2KOVpElyaVaA4N NzurTfHs4EfRNMUGk4QlQX336na1XDQ4vBUofolVTY7gjf2Ks9WHb0ySgQpZaGDuZRMhTy0yLxlU cKRW++7AO9d3GX7syupHBq6b1q82M2kBWmBGlvhueVXpSS29Q7787TWVOR4SGNdjwJKDmpsMh1lR 2RItOs5hCP8qy3F6toIuZEwOPmJBtRJMES9wqS1SV2 X-QQ-XMRINFO: NyFYKkN4Ny6FSmKK/uo/jdU= From: uk7b@foxmail.com To: dev@dpdk.org Cc: sunyuechi , Stanislaw Kardach , Bruce Richardson Subject: [PATCH 1/3] config/riscv: detect V extension Date: Thu, 29 May 2025 00:57:09 +0800 X-OQ-MSGID: <20250528165711.216524-1-uk7b@foxmail.com> X-Mailer: git-send-email 2.49.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Thu, 29 May 2025 11:56:11 +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 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