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 A5A8345FCC; Thu, 2 Jan 2025 23:33:06 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id BF9F9402EE; Thu, 2 Jan 2025 23:32:57 +0100 (CET) Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by mails.dpdk.org (Postfix) with ESMTP id A08B4402B4 for ; Thu, 2 Jan 2025 23:32:54 +0100 (CET) Received: by linux.microsoft.com (Postfix, from userid 1213) id BA1462041A8C; Thu, 2 Jan 2025 14:32:53 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com BA1462041A8C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1735857173; bh=gmfn01yYKHMKCxBb9bK1wBcJD7amHnInhfITshKYGjM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gkuZilGNDp/l/JlJO7bukC0qY00YItLu16gko3z3iz3YKz3e0ujGonUWeNhj0Ubi+ gye0Ll4awsAPb1uN295rsTTtTXPvQD+56PlOyZLw/5C9w/aYWPmTUGGk1rkZGWPPYs eHKEAF9hQ4Yb5qzb68O0HVDSc3gu4jhiPJWLL1uY= From: Andre Muezerie To: Tyler Retzlaff Cc: dev@dpdk.org, Andre Muezerie Subject: [PATCH 2/5] lib/eal: add portable version of __builtin_add_overflow Date: Thu, 2 Jan 2025 14:32:45 -0800 Message-Id: <1735857169-19131-3-git-send-email-andremue@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1735857169-19131-1-git-send-email-andremue@linux.microsoft.com> References: <1735857169-19131-1-git-send-email-andremue@linux.microsoft.com> 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 __builtin_add_overflow is gcc specific. There's a need for a portable version that can also be used with other compilers. This patch introduces __rte_add_overflow_u8, __rte_add_overflow_u16 and __rte_add_overflow_u32. Signed-off-by: Andre Muezerie --- lib/eal/include/meson.build | 1 + lib/eal/include/rte_math.h | 42 +++++++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+) create mode 100644 lib/eal/include/rte_math.h diff --git a/lib/eal/include/meson.build b/lib/eal/include/meson.build index d903577caa..041a4105b5 100644 --- a/lib/eal/include/meson.build +++ b/lib/eal/include/meson.build @@ -31,6 +31,7 @@ headers += files( 'rte_lcore_var.h', 'rte_lock_annotations.h', 'rte_malloc.h', + 'rte_math.h', 'rte_mcslock.h', 'rte_memory.h', 'rte_memzone.h', diff --git a/lib/eal/include/rte_math.h b/lib/eal/include/rte_math.h new file mode 100644 index 0000000000..df2f3d4d34 --- /dev/null +++ b/lib/eal/include/rte_math.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: BSD-3-Clause + * Copyright(c) 2025 Microsoft Corporation + */ + +#ifndef _RTE_MATH_H_ +#define _RTE_MATH_H_ + +/** + * @file + * + * Math function definitions for DPDK. + */ + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * Functions that allow performing simple arithmetic operations together with + * checking whether the operations overflowed. + * Example of usage: + * uint8_t overflow; + * uint16_t a, b, result; + * a = 1; + * b = 2; + * overflow = __rte_add_overflow_u16(a, b, &result); + */ +#ifdef RTE_TOOLCHAIN_MSVC +#define __rte_add_overflow_u8(a, b, res) _addcarry_u8(0, a, b, res) +#define __rte_add_overflow_u16(a, b, res) _addcarry_u16(0, a, b, res) +#define __rte_add_overflow_u32(a, b, res) _addcarry_u32(0, a, b, res) +#else +#define __rte_add_overflow_u8(a, b, res) __builtin_add_overflow(a, b, res) +#define __rte_add_overflow_u16(a, b, res) __builtin_add_overflow(a, b, res) +#define __rte_add_overflow_u32(a, b, res) __builtin_add_overflow(a, b, res) +#endif + +#ifdef __cplusplus +} +#endif + +#endif -- 2.47.0.vfs.0.3