From patchwork Tue Jan 10 21:01:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella X-Patchwork-Id: 62917 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 87D0F3860742 for ; Tue, 10 Jan 2023 21:04:29 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 87D0F3860742 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1673384669; bh=NB6MyQN54L0ZfjYrf0IIqicl8+o3iDBFOSABu07doRU=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=SYCwl/0DsuFfFr1xNY8yVc5fCqbphzlHttnZ/oz3tUFDkdHQBLpxYCoKBEiEK2+xX vMHVWgCD/7eGoFssjGJsdk+cOBzPZKtBqwe/7fj+s65PrCKWOlGaKTgc4Mw4Ih4ge8 JRB3+0wvWy4uuJaOGqmEGevv/AH87Vv5tLajx/tU= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-oo1-xc35.google.com (mail-oo1-xc35.google.com [IPv6:2607:f8b0:4864:20::c35]) by sourceware.org (Postfix) with ESMTPS id 5446C38493F8 for ; Tue, 10 Jan 2023 21:01:50 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 5446C38493F8 Received: by mail-oo1-xc35.google.com with SMTP id x15-20020a4ab90f000000b004e64a0a967fso3549180ooo.2 for ; Tue, 10 Jan 2023 13:01:50 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=NB6MyQN54L0ZfjYrf0IIqicl8+o3iDBFOSABu07doRU=; b=grXwKKjNNGx65ZDq3NMDcjXCSsSPDf85RwWD7T8scMMvhY67QzLgYKZh343DKEG3/M KI7WkebmnAD6lczp1qCEPQyAjo1xO401pnx+GtzSdwT3q4/DQHNr1ZGEFrNz68Mp3SVP GOyUVN/yxFC0lmifNybRmrUqD5TDsm0Z25aO39qmRLEC/tyCng0VXBf2Wk9z3X35zKjM YWpiTFQwB3TF8aZSJ3Gwn9jHJDWVKTkE76TVxkSBZ+AKE73zG/dccVGA3NbmGyzR7c77 6LJCDWolgOah7EG7zldazp79TIUDI9+fpXJ4+jxlHbpravZ79PJcE0EKzZiJGMf+ZFjQ fBzw== X-Gm-Message-State: AFqh2kqagAKPjeFM8buDMVZQCPqrW26Fer5GCTZOj9uD7Rr9psomWdKl N4XFIPn6WN+V49vGmZxeMJDiLxdLUOYGEcQCNGw= X-Google-Smtp-Source: AMrXdXtIuvQzIdqjMLdSBNqL8YlxWeU4eFQkne8XX2rPei8uBCgEPlgid3L/I3SklM12Qf+KKZM7eA== X-Received: by 2002:a05:6820:138a:b0:4a3:aa96:23c7 with SMTP id i10-20020a056820138a00b004a3aa9623c7mr35730049oow.6.1673384509325; Tue, 10 Jan 2023 13:01:49 -0800 (PST) Received: from mandiga.. ([2804:1b3:a7c0:a93a:e8a0:dd55:3328:997]) by smtp.gmail.com with ESMTPSA id r5-20020a4a83c5000000b0049ee88e86f9sm6202193oog.10.2023.01.10.13.01.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Jan 2023 13:01:48 -0800 (PST) To: libc-alpha@sourceware.org, Noah Goldstein , Richard Henderson Subject: [PATCH v6 16/17] powerpc: Add string-fza.h Date: Tue, 10 Jan 2023 18:01:05 -0300 Message-Id: <20230110210106.1457686-17-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230110210106.1457686-1-adhemerval.zanella@linaro.org> References: <20230110210106.1457686-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.8 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, 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: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" From: Richard Henderson While ppc has the more important string functions in assembly, there are still a few generic routines used. Use the Power 6 CMPB insn for testing of zeros. Checked on powerpc64le-linux-gnu. --- sysdeps/powerpc/string-fza.h | 70 ++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 sysdeps/powerpc/string-fza.h diff --git a/sysdeps/powerpc/string-fza.h b/sysdeps/powerpc/string-fza.h new file mode 100644 index 0000000000..5496c9db4b --- /dev/null +++ b/sysdeps/powerpc/string-fza.h @@ -0,0 +1,70 @@ +/* Zero byte detection; basics. PowerPC version. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _POWERPC_STRING_FZA_H +#define _POWERPC_STRING_FZA_H 1 + +/* PowerISA 2.05 (POWER6) provides cmpb instruction. */ +#ifdef _ARCH_PWR6 +# include + +/* This function returns 0xff for each byte that is + equal between X1 and X2. */ + +static __always_inline op_t +find_eq_all (op_t x1, op_t x2) +{ + op_t ret; + asm ("cmpb %0,%1,%2" : "=r"(ret) : "r"(x1), "r"(x2)); + return ret; +} + +/* This function returns 0xff for each byte that is zero in X. */ + +static __always_inline op_t +find_zero_all (op_t x) +{ + return find_eq_all (x, 0); +} + +/* Identify zero bytes in X1 or equality between X1 and X2. */ + +static __always_inline op_t +find_zero_eq_all (op_t x1, op_t x2) +{ + return find_zero_all (x1) | find_eq_all (x1, x2); +} + +/* Identify zero bytes in X1 or inequality between X1 and X2. */ + +static __always_inline op_t +find_zero_ne_all (op_t x1, op_t x2) +{ + return find_zero_all (x1) | ~find_eq_all (x1, x2); +} + +/* Define the "inexact" versions in terms of the exact versions. */ +# define find_zero_low find_zero_all +# define find_eq_low find_eq_all +# define find_zero_eq_low find_zero_eq_all +# define find_zero_ne_low find_zero_ne_all +#else +# include +#endif /* _ARCH_PWR6 */ + +#endif /* _POWERPC_STRING_FZA_H */