From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ot1-x334.google.com (mail-ot1-x334.google.com [IPv6:2607:f8b0:4864:20::334]) by sourceware.org (Postfix) with ESMTPS id CDC5E3857BAE for ; Fri, 2 Sep 2022 20:40:09 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org CDC5E3857BAE 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-ot1-x334.google.com with SMTP id y25-20020a056830109900b0063b3c1fe018so2237195oto.2 for ; Fri, 02 Sep 2022 13:40:09 -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=luFQCELdvD7D1mItyEc+nCuoqBp5K4atPNNedDg1ZlY4IpD+UrFTAxUujyMfBcCiyd A3uu7X2MezezsijawFKgpU+jzO3S/nYNJa7Cf9MT2ZRJ7E5BMUXWN3Zawh5F30jkygpZ MrKFFjThslTA3q8Qi52JKi5gr2eT8rjv3JeEC0kwfTbNaeAF1BtAuBpQbiIwMWoPL4M2 0nqVEI80sK+R16BSvP/G5KGXkq6wcZL1ZRmOcYyRbTwczK99ss5uX+hyhd6YTXycXx/3 WKXg2WxW2obMiANSp1cyOdZHXV+0LkfIG/OkJMN1qnzIRrQ1I9M/E/T8p/COJWVa+oL6 2w7g== 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=RuLXYugTC5hlf633OaMTD7tho467bhAmnEEZJuUI0zIS5RLyCmSeoufxMjvXl6P7pl ECB7qHWrG3H52d204juUl0BJCaIPqQ9zwJlpDa8zOh74qHYuabG3k4QJqxfxliz3CLPh YQlN5E5d3dWXvw39fby0Ji1vLJjuL8omiT+eb4LBNbp7oDbOn6TPSl8F/ZUNHqj6nJpS uiteW9cnRnHqkELoVvS4uTculfk7VCpPeJ37+D+1xcS2e6Ahk1E8SkjYl1t2Kv6WuIcf iQxooccsP/JbRkIpmoOt0LitxJusCuiWMIV95zgeRIQK/BwxEiJPyRZbjbqIR8rUE/5R 0Tlg== X-Gm-Message-State: ACgBeo1hkoaNc9ueDcpMPlhvTQFIezw52j4EAQD4WYythBjYj21Mgh1O ib2O+sEQCFBO+ZYh9C1hjGItFafNIGeOAA== X-Google-Smtp-Source: AA6agR5Gd8EeH4KyxwJo3PrNv4ctBYOjuby5bP/Az0DyaFOazMoyydXkV9CP+VBaAfS6Hp1tv3ee+A== X-Received: by 2002:a05:6830:d0f:b0:63b:439d:3631 with SMTP id bu15-20020a0568300d0f00b0063b439d3631mr6338951otb.2.1662151208765; Fri, 02 Sep 2022 13:40:08 -0700 (PDT) Received: from mandiga.. ([2804:1b3:a7c0:dfed:72d1:946c:4eb1:ce5f]) by smtp.gmail.com with ESMTPSA id i27-20020a4a6f5b000000b00425678b9c4bsm1107902oof.0.2022.09.02.13.40.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Sep 2022 13:40:08 -0700 (PDT) From: Adhemerval Zanella To: libc-alpha@sourceware.org Cc: Joseph Myers , caiyinyu , Richard Henderson Subject: [PATCH 14/17] alpha: Add string-fzb.h and string-fzi.h Date: Fri, 2 Sep 2022 17:39:37 -0300 Message-Id: <20220902203940.2385967-15-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220902203940.2385967-1-adhemerval.zanella@linaro.org> References: <20220902203940.2385967-1-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,T_SCC_BODY_TEXT_LINE 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