From patchwork Sun Jul 7 14:58:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julian Zhu X-Patchwork-Id: 93466 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 13167384A45D for ; Sun, 7 Jul 2024 14:59:34 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from nisdydeair.tail4cdaa.ts.net (unknown [IPv6:2605:52c0:2:e9a:307b:dbff:fe9d:66cf]) by sourceware.org (Postfix) with ESMTP id E46573858CDA for ; Sun, 7 Jul 2024 14:59:07 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org E46573858CDA Authentication-Results: sourceware.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: sourceware.org; spf=none smtp.mailfrom=nisdydeair.tail4cdaa.ts.net ARC-Filter: OpenARC Filter v1.0.0 sourceware.org E46573858CDA Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2605:52c0:2:e9a:307b:dbff:fe9d:66cf ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1720364349; cv=none; b=N0dQiFhI8Tkcr0VE5peGesMXsRwBysKYqGW0mhTZAe2xZ6zW08bwkfg9en3c6zl7Gh7Y94eiya4t9x9dw/UV/ZcagY2kaCpm3ex4xOLahyJkOydrhIEkjQt7cJ5CBEboY5hcIMAJnOpJ6DB2yB1Q0KWtbstVzNnYDtI85Mo1hm0= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1720364349; c=relaxed/simple; bh=AToXOr/Tm8RMeusu4Sk6OK+7jSFN/LjSIbkeUL6hEp0=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=W7ZXHALLQ8/W1qxXUHC34tHs4tbMoYq+wEFlIkmUFAi1NaB5YKgsIA3N1V5Y3dZcIGzUZj7k1io7RlHo2lku6yhwLDp4QkZVmIKv3hMWc68j0h9DjWuhGGGmIcSG8U0XZqVXpA+uVySTCOUcfW4FXOE7enUTxtCQHs3kdQLotIA= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by nisdydeair.tail4cdaa.ts.net (Postfix, from userid 501) id 6D73E290FE80; Sun, 7 Jul 2024 22:58:34 +0800 (CST) From: Julian Zhu To: libc-alpha@sourceware.org Cc: Julian Zhu Subject: [PATCH v2 3/3] RISC-V: Use builtins for ffs and ffsll while supported extension available Date: Sun, 7 Jul 2024 22:58:31 +0800 Message-ID: <20240707145831.9114-3-jz531210@gmail.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240707145831.9114-1-jz531210@gmail.com> References: <20240707145831.9114-1-jz531210@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-9.8 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, FORGED_GMAIL_RCVD, FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM, GIT_PATCH_0, HEADER_FROM_DIFFERENT_DOMAINS, KAM_DMARC_NONE, KAM_DMARC_STATUS, KAM_LAZY_DOMAIN_SECURITY, KHOP_HELO_FCRDNS, MAY_BE_FORGED, NML_ADSP_CUSTOM_MED, NO_DNS_FOR_FROM, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~patchwork=sourceware.org@sourceware.org Hardware ctz/ctzw instructions are available in the RISC-V Zbb extension, and the similar ctz instruction th.ff1 is available in the RISC-V XTheadBb extension. We can get more simplified code compared to the generic implement of ffs/ffsll. Signed-off-by: Julian Zhu --- sysdeps/riscv/math-use-builtins-ffs.h | 10 ++++++++++ 1 file changed, 10 insertions(+) create mode 100644 sysdeps/riscv/math-use-builtins-ffs.h diff --git a/sysdeps/riscv/math-use-builtins-ffs.h b/sysdeps/riscv/math-use-builtins-ffs.h new file mode 100644 index 0000000000..8104e29f84 --- /dev/null +++ b/sysdeps/riscv/math-use-builtins-ffs.h @@ -0,0 +1,10 @@ +#if defined COMPILER_ZBB_AVAIL && defined __riscv_zbb +# define USE_FFS_BUILTIN 1 +# define USE_FFSLL_BUILTIN 1 +#elif defined COMPILER_XTHEADBB_AVAIL && defined __riscv_xtheadbb +# define USE_FFS_BUILTIN 0 +# define USE_FFSLL_BUILTIN 1 +#else +# define USE_FFS_BUILTIN 0 +# define USE_FFSLL_BUILTIN 0 +#endif