From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi1-x22b.google.com (mail-oi1-x22b.google.com [IPv6:2607:f8b0:4864:20::22b]) by sourceware.org (Postfix) with ESMTPS id 4CA6D3857BB5 for ; Mon, 19 Sep 2022 19:59:48 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 4CA6D3857BB5 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=linaro.org Received: by mail-oi1-x22b.google.com with SMTP id v130so910050oie.2 for ; Mon, 19 Sep 2022 12:59:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=VPl5idg7nmu4rl+u9SzggIv0yZg5ORisPUXbpJXo8Kk=; b=x6aXh3uiauFp5mAruZbY/W/wDtKXO36Jz1LaWnzOe4Zz/xPs+aetg2MqUHvpKoWtRE qQIiDwa/u7J1iBPfasRTGfNUMBdBwzfY1svQcoLjWk6BHWCkb7jBTQ9r7dvDYxstP/Jq i9mOgHxE2Afs/CggLAh6CH08q9JkBAv0qvQfabzjt+EdHBV4J15zgt5vHisf2c8hHo/Z jJhJENpKAfLKYYxOsPzYGfzJNN6sfO/jOFyd5gERs5Tr36QHekt12eFrpk0D6Yfx3F7o AgwqmkiXrFvj//sQFWXxKLW1Fgxj6+Q2wkgqr+Uy7jTRorzxuQk+cehYHIgEgiqKnNx2 UMrw== 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:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=VPl5idg7nmu4rl+u9SzggIv0yZg5ORisPUXbpJXo8Kk=; b=nWHQh7EoYVXwoPngHpEQpMHTSYMhUot0my+BK5j6J84upbDGZMnDwLXm2UR81au5fD 8pXSMxU50o7salkE2CAIKc0USNwrlO5gS7kpnPAwurBnnRAQ1JcDEUyvV7yR0CPBYKSL P/sQQL3yJYAlW0ls7E1JaV5tVGKEQ3FxHvL5JSnbhsFMf86gGzJf0ztdHzWV2d+AsAUd a2t/+o3O8qOWHqv4QzIuEdO+b1LHkT+RhqS6jdJkRuhUv51EPGfs/SsnV1vKsToI8ApX LfPDOFYBcd95QpN2QaPbq1gHH+S2/206QDaDU6jdYN2RP5JxYMQMYokRVAPgTzlmz1oC Z49g== X-Gm-Message-State: ACrzQf2oSpdRFzt5VPu1pG5aprzP74n8hrhATchzC0NMDrqxFEAUs7Xn jd43tA719lkpebihc6jWmrjJNRSRpLs6PxXt X-Google-Smtp-Source: AMsMyM45FRyz4QpVHBj49cRaxLb+O0HpyjGTnxkshfm2RPtwXcIgLZ2fjBx0Kjpwr66wavTwW0OIGw== X-Received: by 2002:a05:6808:144b:b0:350:a06a:f8b7 with SMTP id x11-20020a056808144b00b00350a06af8b7mr3516441oiv.272.1663617587637; Mon, 19 Sep 2022 12:59:47 -0700 (PDT) Received: from mandiga.. ([2804:1b3:a7c1:c266:b3ad:a56d:1ca:d6ea]) by smtp.gmail.com with ESMTPSA id l7-20020a4ab0c7000000b00475dc6c6f31sm4532291oon.45.2022.09.19.12.59.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Sep 2022 12:59:47 -0700 (PDT) From: Adhemerval Zanella To: libc-alpha@sourceware.org Cc: Richard Henderson Subject: [PATCH v5 14/17] alpha: Add string-fzb.h and string-fzi.h Date: Mon, 19 Sep 2022 16:59:17 -0300 Message-Id: <20220919195920.956393-15-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220919195920.956393-1-adhemerval.zanella@linaro.org> References: <20220919195920.956393-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 List-Id: From: Richard Henderson While alpha has the more important string functions in assembly, there are still a few for find the generic routines are used. Use the CMPBGE insn, via the builtin, for testing of zeros. Use a simplified expansion of __builtin_ctz when the insn isn't available. Checked on alpha-linux-gnu. --- sysdeps/alpha/string-fzb.h | 51 +++++++++++++++++ sysdeps/alpha/string-fzi.h | 113 +++++++++++++++++++++++++++++++++++++ 2 files changed, 164 insertions(+) create mode 100644 sysdeps/alpha/string-fzb.h create mode 100644 sysdeps/alpha/string-fzi.h diff --git a/sysdeps/alpha/string-fzb.h b/sysdeps/alpha/string-fzb.h new file mode 100644 index 0000000000..6b19a2106c --- /dev/null +++ b/sysdeps/alpha/string-fzb.h @@ -0,0 +1,51 @@ +/* Zero byte detection; boolean. Alpha version. + Copyright (C) 2022 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 _STRING_FZB_H +#define _STRING_FZB_H 1 + +#include + +/* Note that since CMPBGE creates a bit mask rather than a byte mask, + we cannot simply provide a target-specific string-fza.h. */ + +/* Determine if any byte within X is zero. This is a pure boolean test. */ + +static inline _Bool +has_zero (op_t x) +{ + return __builtin_alpha_cmpbge (0, x) != 0; +} + +/* Likewise, but for byte equality between X1 and X2. */ + +static inline _Bool +has_eq (op_t x1, op_t x2) +{ + return has_zero (x1 ^ x2); +} + +/* Likewise, but for zeros in X1 and equal bytes between X1 and X2. */ + +static inline _Bool +has_zero_eq (op_t x1, op_t x2) +{ + return has_zero (x1) | has_eq (x1, x2); +} + +#endif /* _STRING_FZB_H */ diff --git a/sysdeps/alpha/string-fzi.h b/sysdeps/alpha/string-fzi.h new file mode 100644 index 0000000000..c1a4683590 --- /dev/null +++ b/sysdeps/alpha/string-fzi.h @@ -0,0 +1,113 @@ +/* string-fzi.h -- zero byte detection; indices. Alpha version. + Copyright (C) 2022 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 _STRING_FZI_H +#define _STRING_FZI_H + +#include +#include + +/* Note that since CMPBGE creates a bit mask rather than a byte mask, + we cannot simply provide a target-specific string-fza.h. */ + +/* A subroutine for the index_zero functions. Given a bitmask C, + return the index of the first bit set in memory order. */ + +static inline unsigned int +index_first_ (unsigned long int c) +{ +#ifdef __alpha_cix__ + return __builtin_ctzl (c); +#else + c = c & -c; + return (c & 0xf0 ? 4 : 0) + (c & 0xcc ? 2 : 0) + (c & 0xaa ? 1 : 0); +#endif +} + +/* Similarly, but return the (memory order) index of the last bit + that is non-zero. Note that only the least 8 bits may be nonzero. */ + +static inline unsigned int +index_last_ (unsigned long int x) +{ +#ifdef __alpha_cix__ + return __builtin_clzl (x) ^ 63; +#else + unsigned r = 0; + if (x & 0xf0) + r += 4; + if (x & (0xc << r)) + r += 2; + if (x & (0x2 << r)) + r += 1; + return r; +#endif +} + +/* Given a word X that is known to contain a zero byte, return the + index of the first such within the word in memory order. */ + +static inline unsigned int +index_first_zero (op_t x) +{ + return index_first_ (__builtin_alpha_cmpbge (0, x)); +} + +/* Similarly, but perform the test for byte equality between X1 and X2. */ + +static inline unsigned int +index_first_eq (op_t x1, op_t x2) +{ + return index_first_zero (x1 ^ x2); +} + +/* Similarly, but perform the search for zero within X1 or + equality between X1 and X2. */ + +static inline unsigned int +index_first_zero_eq (op_t x1, op_t x2) +{ + return index_first_ (__builtin_alpha_cmpbge (0, x1) + | __builtin_alpha_cmpbge (0, x1 ^ x2)); +} + +/* Similarly, but perform the search for zero within X1 or + inequality between X1 and X2. */ + +static inline unsigned int +index_first_zero_ne (op_t x1, op_t x2) +{ + return index_first_ (__builtin_alpha_cmpbge (0, x1) + | (__builtin_alpha_cmpbge (0, x1 ^ x2) ^ 0xFF)); +} + +/* Similarly, but search for the last zero within X. */ + +static inline unsigned int +index_last_zero (op_t x) +{ + return index_last_ (__builtin_alpha_cmpbge (0, x)); +} + +static inline unsigned int +index_last_eq (op_t x1, op_t x2) +{ + return index_last_zero (x1 ^ x2); +} + +#endif /* _STRING_FZI_H */ -- 2.34.1