From patchwork Thu Feb 2 18:11:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella X-Patchwork-Id: 649665 Delivered-To: patch@linaro.org Received: by 2002:a17:522:d8c:b0:4be:c3dc:14d8 with SMTP id d12csp396441pva; Thu, 2 Feb 2023 10:16:51 -0800 (PST) X-Google-Smtp-Source: AK7set9GTMO9hGRbhtXhpBiZeCUGMFqz/j+5109CruWnPclE2uoVa540XCoVDG50/KdvQquocpe2 X-Received: by 2002:a17:906:c08f:b0:88c:a2cb:d06d with SMTP id f15-20020a170906c08f00b0088ca2cbd06dmr7479517ejz.31.1675361811232; Thu, 02 Feb 2023 10:16:51 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1675361811; cv=none; d=google.com; s=arc-20160816; b=C+NMJgZQsjtEu99gVyuhqjkyEtTcVPd7bUHaXk940SwOrbCrlwIvoiNMLlqOdUS46n xx1eH8h9/0hzCzjKAUUinn2QbqWNGCanaQUhhNJQAmk7xSQnHbXDE1axVp5NTx8/C66m oqBwTKc0gpLQgwkBcBEO0RRQlOlBPdEA7mEZFYFpuKYFzmIUowYETgRyTHy9S5ZY4m9s RfOx4WFHWspj6Ws+1ra+K5IazooCvwIbntmuNDF5+5J7XaQsScSXC/s5gBr5pvutmliq e3evGbnL8vedmzdH11bcmrnFCmo2pGTj67clRRn20mHWJomkesEa3tYoMVgl78XkENxQ maPg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:reply-to:from:list-subscribe:list-help:list-post :list-archive:list-unsubscribe:list-id:precedence :content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:dmarc-filter:delivered-to:dkim-signature :dkim-filter; bh=idrqENDX2WuyAiQLTdhPSJ6g6u6MMmWmcKCanb7PO1g=; b=UCVE8snq9PLJMLnTwnWEVWk64JwfgJNAdYaA7n9d65yLhuRVCrDKFNklxoemNGcgLt EXE2XyUaitrZxVp7Y7OAANiviCaHG7OVdUTInBgNpxOanfx9T3dsDwE6KsAzlyzHzU9M sLzAMYFdfyUuzjK6gYDDbTpv/5RuUr0Gh3uY7qOaVvnNowgGtOLwwNiat92Gzvc75Bch XLN6mIWqF1c4wwXcSBU25Ftu2Lq35BRFNSjFYmK5phl3yZqjS1u6VU3Ya9VHMranalA4 F2Zoek31kaZxMvqmUQ2+uvuUifCHlRdAFPJsk2eximDZwsTqFG7KNiu2rPenkgxMvY4O wQbQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@sourceware.org header.s=default header.b=bOHrmX3Z; spf=pass (google.com: domain of libc-alpha-bounces+patch=linaro.org@sourceware.org designates 2620:52:3:1:0:246e:9693:128c as permitted sender) smtp.mailfrom="libc-alpha-bounces+patch=linaro.org@sourceware.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=sourceware.org Return-Path: Received: from sourceware.org (server2.sourceware.org. [2620:52:3:1:0:246e:9693:128c]) by mx.google.com with ESMTPS id vz14-20020a17090704ce00b008838fdcfbbesi250671ejb.22.2023.02.02.10.16.50 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Feb 2023 10:16:51 -0800 (PST) Received-SPF: pass (google.com: domain of libc-alpha-bounces+patch=linaro.org@sourceware.org designates 2620:52:3:1:0:246e:9693:128c as permitted sender) client-ip=2620:52:3:1:0:246e:9693:128c; Authentication-Results: mx.google.com; dkim=pass header.i=@sourceware.org header.s=default header.b=bOHrmX3Z; spf=pass (google.com: domain of libc-alpha-bounces+patch=linaro.org@sourceware.org designates 2620:52:3:1:0:246e:9693:128c as permitted sender) smtp.mailfrom="libc-alpha-bounces+patch=linaro.org@sourceware.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id E2EFB385B538 for ; Thu, 2 Feb 2023 18:16:49 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E2EFB385B538 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1675361809; bh=idrqENDX2WuyAiQLTdhPSJ6g6u6MMmWmcKCanb7PO1g=; 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=bOHrmX3Z54Ira993ecvX5LryVUOdiQlKnbDaS5fqIZMltE8xqD8qBKR7FR9ts4MWH al8JUXebj25b6V3m9vAMYSt/fw4YZAoduuKt0FjPzl3gRLdAYfZvEBC/5ITvBvyuSw /L+7ogU/1iOm7RzTbVmONiles17R1YmTouhRb998= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-ot1-x336.google.com (mail-ot1-x336.google.com [IPv6:2607:f8b0:4864:20::336]) by sourceware.org (Postfix) with ESMTPS id D3BAA385828D for ; Thu, 2 Feb 2023 18:12:35 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org D3BAA385828D Received: by mail-ot1-x336.google.com with SMTP id v24-20020a05683011d800b0068bdd29b160so681331otq.13 for ; Thu, 02 Feb 2023 10:12:35 -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=idrqENDX2WuyAiQLTdhPSJ6g6u6MMmWmcKCanb7PO1g=; b=Y16MK9KO2x6lNWVON124px8gYkqNsfBE/6FU0SwpF9QttGoyZE1bbOeiMH1vdCFsJp CdtSid2NCyqkBM/6jza2ZQp1zlrN8A4tS38dHXciHxmIbdTSlbXRwy/WxdLsz3CM4pd4 E8itfk2PtAwXDXtnXrUOBbfK9GGs9Pxz6pghrojBWvgiOCIgSJwRV/7oAqi6+x1tVMtx qCyqvfnH1Fq8Zt2A8YOB/VtrXXv+rc7sa0NKPdWUqZ0SVHtIi2d6AviLV20AQt/6Bpzi S9rDHg9VUV34ka2m7PwJYqerdx8C3i+/l2+DwLAlaVxASFNpHSSvcx8gH1P9ud0pPX7W Alhg== X-Gm-Message-State: AO0yUKUbx+FnjigzslO9Px6W9db0xHZGCMTMNXbvwzlkRpJchKdgj/4q 5FfTBSWUKHxt0WSSSquewXKE8FHpTXJ/gPMXCMM= X-Received: by 2002:a9d:6a05:0:b0:68b:cd66:2c52 with SMTP id g5-20020a9d6a05000000b0068bcd662c52mr3202277otn.5.1675361554777; Thu, 02 Feb 2023 10:12:34 -0800 (PST) Received: from mandiga.. ([2804:1b3:a7c2:1887:da12:b9d3:2162:a28c]) by smtp.gmail.com with ESMTPSA id ci10-20020a05683063ca00b00684a10970adsm126689otb.16.2023.02.02.10.12.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Feb 2023 10:12:34 -0800 (PST) To: libc-alpha@sourceware.org, Richard Henderson , Jeff Law , Xi Ruoyao , Noah Goldstein Subject: [PATCH v12 16/31] hppa: Add string-fza.h, string-fzc.h, and string-fzi.h Date: Thu, 2 Feb 2023 15:11:34 -0300 Message-Id: <20230202181149.2181553-17-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230202181149.2181553-1-adhemerval.zanella@linaro.org> References: <20230202181149.2181553-1-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+patch=linaro.org@sourceware.org Sender: "Libc-alpha" From: Richard Henderson Use UXOR,SBZ to test for a zero byte within a word. While we can get semi-decent code out of asm-goto, we would do slightly better with a compiler builtin. For index_zero et al, sequential testing of bytes is less expensive than any tricks that involve a count-leading-zeros insn that we don't have. Checked on hppa-linux-gnu. Reviewed-by: Adhemerval Zanella --- sysdeps/hppa/string-fzb.h | 63 +++++++++++++++++++ sysdeps/hppa/string-fzc.h | 124 ++++++++++++++++++++++++++++++++++++++ sysdeps/hppa/string-fzi.h | 63 +++++++++++++++++++ 3 files changed, 250 insertions(+) create mode 100644 sysdeps/hppa/string-fzb.h create mode 100644 sysdeps/hppa/string-fzc.h create mode 100644 sysdeps/hppa/string-fzi.h diff --git a/sysdeps/hppa/string-fzb.h b/sysdeps/hppa/string-fzb.h new file mode 100644 index 0000000000..d6b234a271 --- /dev/null +++ b/sysdeps/hppa/string-fzb.h @@ -0,0 +1,63 @@ +/* Zero byte detection, boolean. HPPA 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 _STRING_FZB_H +#define _STRING_FZB_H 1 + +#include +#include + +_Static_assert (sizeof (op_t) == 4, "64-bit not supported"); + +/* Determine if any byte within X is zero. This is a pure boolean test. */ +static __always_inline _Bool +has_zero (op_t x) +{ + /* It's more useful to expose a control transfer to the compiler + than to expose a proper boolean result. */ + asm goto ("uxor,sbz %%r0,%0,%%r0\n\t" + "b,n %l1" : : "r"(x) : : nbz); + return 1; + nbz: + return 0; +} + +/* Likewise, but for byte equality between X1 and X2. */ +static __always_inline _Bool +has_eq (op_t x1, op_t x2) +{ + asm goto ("uxor,sbz %0,%1,%%r0\n\t" + "b,n %l2" : : "r"(x1), "r"(x2) : : nbz); + return 1; + nbz: + return 0; +} + +/* Likewise, but for zeros in X1 and equal bytes between X1 and X2. */ +static __always_inline _Bool +has_zero_eq (op_t x1, op_t x2) +{ + asm goto ("uxor,sbz %%r0,%0,%%r0\n\t" + "uxor,nbz %0,%1,%%r0\n\t" + "b,n %l2" : : "r"(x1), "r"(x2) : : sbz); + return 0; + sbz: + return 1; +} + +#endif /* _STRING_FZB_H */ diff --git a/sysdeps/hppa/string-fzc.h b/sysdeps/hppa/string-fzc.h new file mode 100644 index 0000000000..c4e2e11550 --- /dev/null +++ b/sysdeps/hppa/string-fzc.h @@ -0,0 +1,124 @@ +/* string-fzc.h -- zero byte detection with indexes. HPPA 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 _STRING_FZC_H +#define _STRING_FZC_H 1 + +#include + +_Static_assert (sizeof (op_t) == 4, "64-bit not supported"); + +/* Given a word X that is known to contain a zero byte, return the + index of the first such within the long in memory order. */ +static __always_inline unsigned int +index_first_zero (op_t x) +{ + unsigned int ret; + + /* Since we have no clz insn, direct tests of the bytes is faster + than loading up the constants to do the masking. */ + asm ("extrw,u,<> %1,23,8,%%r0\n\t" + "ldi 2,%0\n\t" + "extrw,u,<> %1,15,8,%%r0\n\t" + "ldi 1,%0\n\t" + "extrw,u,<> %1,7,8,%%r0\n\t" + "ldi 0,%0" + : "=r"(ret) : "r"(x), "0"(3)); + + return ret; +} + +/* Similarly, but perform the search for byte equality between X1 and X2. */ +static __always_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 __always_inline unsigned int +index_first_zero_eq (op_t x1, op_t x2) +{ + unsigned int ret; + + /* Since we have no clz insn, direct tests of the bytes is faster + than loading up the constants to do the masking. */ + asm ("extrw,u,= %1,23,8,%%r0\n\t" + "extrw,u,<> %2,23,8,%%r0\n\t" + "ldi 2,%0\n\t" + "extrw,u,= %1,15,8,%%r0\n\t" + "extrw,u,<> %2,15,8,%%r0\n\t" + "ldi 1,%0\n\t" + "extrw,u,= %1,7,8,%%r0\n\t" + "extrw,u,<> %2,7,8,%%r0\n\t" + "ldi 0,%0" + : "=r"(ret) : "r"(x1), "r"(x1 ^ x2), "0"(3)); + + return ret; +} + +/* Similarly, but perform the search for zero within X1 or + inequality between X1 and X2. */ +static __always_inline unsigned int +index_first_zero_ne (op_t x1, op_t x2) +{ + unsigned int ret; + + /* Since we have no clz insn, direct tests of the bytes is faster + than loading up the constants to do the masking. */ + asm ("extrw,u,<> %2,23,8,%%r0\n\t" + "extrw,u,<> %1,23,8,%%r0\n\t" + "ldi 2,%0\n\t" + "extrw,u,<> %2,15,8,%%r0\n\t" + "extrw,u,<> %1,15,8,%%r0\n\t" + "ldi 1,%0\n\t" + "extrw,u,<> %2,7,8,%%r0\n\t" + "extrw,u,<> %1,7,8,%%r0\n\t" + "ldi 0,%0" + : "=r"(ret) : "r"(x1), "r"(x1 ^ x2), "0"(3)); + + return ret; +} + +/* Similarly, but search for the last zero within X. */ +static __always_inline unsigned int +index_last_zero (op_t x) +{ + unsigned int ret; + + /* Since we have no ctz insn, direct tests of the bytes is faster + than loading up the constants to do the masking. */ + asm ("extrw,u,<> %1,15,8,%%r0\n\t" + "ldi 1,%0\n\t" + "extrw,u,<> %1,23,8,%%r0\n\t" + "ldi 2,%0\n\t" + "extrw,u,<> %1,31,8,%%r0\n\t" + "ldi 3,%0" + : "=r"(ret) : "r"(x), "0"(0)); + + return ret; +} + +static __always_inline unsigned int +index_last_eq (op_t x1, op_t x2) +{ + return index_last_zero (x1 ^ x2); +} + +#endif /* _STRING_FZC_H */ diff --git a/sysdeps/hppa/string-fzi.h b/sysdeps/hppa/string-fzi.h new file mode 100644 index 0000000000..08cdace416 --- /dev/null +++ b/sysdeps/hppa/string-fzi.h @@ -0,0 +1,63 @@ +/* string-fzi.h -- zero byte indexes. HPPA 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 _STRING_FZI_H +#define _STRING_FZI_H 1 + +#include +#include + +_Static_assert (sizeof (op_t) == 4, "64-bit not supported"); + +static __always_inline unsigned int +index_first (find_t c) +{ + unsigned int ret; + + /* Since we have no clz insn, direct tests of the bytes is faster + than loading up the constants to do the masking. */ + asm ("extrw,u,= %1,23,8,%%r0\n\t" + "ldi 2,%0\n\t" + "extrw,u,= %1,15,8,%%r0\n\t" + "ldi 1,%0\n\t" + "extrw,u,= %1,7,8,%%r0\n\t" + "ldi 0,%0" + : "=r"(ret) : "r"(c), "0"(3)); + + return ret; +} + +static __always_inline unsigned int +index_last (find_t c) +{ + unsigned int ret; + + /* Since we have no ctz insn, direct tests of the bytes is faster + than loading up the constants to do the masking. */ + asm ("extrw,u,= %1,15,8,%%r0\n\t" + "ldi 1,%0\n\t" + "extrw,u,= %1,23,8,%%r0\n\t" + "ldi 2,%0\n\t" + "extrw,u,= %1,31,8,%%r0\n\t" + "ldi 3,%0" + : "=r"(ret) : "r"(c), "0"(0)); + + return ret; +} + +#endif /* _STRING_FZI_H */