From patchwork Tue Feb 3 15:05:28 2026 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zihong Yao X-Patchwork-Id: 129489 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from vm01.sourceware.org (localhost [127.0.0.1]) by sourceware.org (Postfix) with ESMTP id 231D54B9DB4A for ; Tue, 3 Feb 2026 15:16:29 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 231D54B9DB4A X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) by sourceware.org (Postfix) with ESMTPS id AEC744BA2E14 for ; Tue, 3 Feb 2026 15:14:57 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org AEC744BA2E14 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=isrc.iscas.ac.cn Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=isrc.iscas.ac.cn ARC-Filter: OpenARC Filter v1.0.0 sourceware.org AEC744BA2E14 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=159.226.251.21 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1770131698; cv=none; b=YmUhbJB5hUw6wyRMDT7krXZu1N5ayhNcfdgA5eseTwbOcv5fHcIy/9wTtfDcHUtWXvTkxIO6bU5QkJrz1yNL7AJ6QLCHCcwhQN9XkZPXhVewgOmItCmhQjpzzj1mmbzQFqA66uIKYbb2zOYNS9Il7J6GjwruLDUsxmjtJQyliQ4= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1770131698; c=relaxed/simple; bh=X6yR0EPtKUzYuZvJ38X0ot2jEgbPlOj50s7sJuNbwZY=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=vacF0ZR831bA/4bzL81gSI41AX3OomatTyQKxK+evBXyDfkATZyJsT4bNvvF5M+XoXYKe4vnDM4EHn6tVIhlpI0kCmD/VDNQsLa178HmfjHk5sCNuYz8oDuzlbbvMVzYQi5vVDuTu5cvli40iGUoWfgt6gFarMMsl9WLasxCLe4= ARC-Authentication-Results: i=1; server2.sourceware.org DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org AEC744BA2E14 Received: from Mobilestation.localdomain (unknown [183.6.59.140]) by APP-01 (Coremail) with SMTP id qwCowADHbmriEIJpZ2EVBw--.24930S6; Tue, 03 Feb 2026 23:14:49 +0800 (CST) From: Yao Zihong To: libc-alpha@sourceware.org Cc: adhemerval.zanella@linaro.org, andrew@sifive.com, schwab@linux-m68k.org, bergner@tenstorrent.com, jlaw@ventanamicro.com, zhangyin2018@iscas.ac.cn, enh@google.com, zihongyao@outlook.com, Yao Zihong , Hau Hsu , Yun Hsiang Subject: [PATCH v5 04/18] riscv: Add RVV memcmpeq for multiarch and non-multiarch Date: Tue, 3 Feb 2026 23:05:28 +0800 Message-ID: <20260203151406.27450-5-zihong.plct@isrc.iscas.ac.cn> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260203151406.27450-1-zihong.plct@isrc.iscas.ac.cn> References: <20260203151406.27450-1-zihong.plct@isrc.iscas.ac.cn> MIME-Version: 1.0 X-CM-TRANSID: qwCowADHbmriEIJpZ2EVBw--.24930S6 X-Coremail-Antispam: 1UD129KBjvJXoW3JF17Jr15KF4DZFWDGw4xXrb_yoWfKw4UpF Z5uF15CF1kJrWfGrWSk3Wjg3W5AF95Gr15tr1Y9w4UJ3yUJrs3XFsFy3Z5GFyDJrWFkFWr uFn8WFyjka1xAaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUmI14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI kIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2 z4x0Y4vE2Ix0cI8IcVAFwI0_Jr0_JF4l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Cr0_Gr 1UM28EF7xvwVC2z280aVAFwI0_Jr0_Gr1l84ACjcxK6I8E87Iv6xkF7I0E14v26r4j6r4U JwAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7 IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U M4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628vn2 kIc2xKxwCY1x0262kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkE bVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67 AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI 42IY6xIIjxv20xvEc7CjxVAFwI0_Cr0_Gr1UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCw CI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnI WIevJa73UjIFyTuYvjfUOyIUUUUUU X-Originating-IP: [183.6.59.140] X-CM-SenderInfo: p2lk00vjoszunw6l223fol2u1dvotugofq/ X-Spam-Status: No, score=-11.3 required=5.0 tests=BAYES_00, GIT_PATCH_0, KAM_DMARC_STATUS, KAM_SHORT, RCVD_IN_DNSWL_BLOCKED, RCVD_IN_VALIDITY_RPBL_BLOCKED, RCVD_IN_VALIDITY_SAFE_BLOCKED, SPF_HELO_PASS, SPF_PASS, TXREP, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on 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 Co-authored-by: Hau Hsu Co-authored-by: Yun Hsiang Signed-off-by: Yao Zihong --- sysdeps/riscv/multiarch/memcmpeq-generic.c | 30 +++++++++ sysdeps/riscv/multiarch/memcmpeq-vector.S | 30 +++++++++ sysdeps/riscv/riscv-ifunc.h | 4 ++ sysdeps/riscv/rvv/memcmpeq.S | 67 +++++++++++++++++++ .../unix/sysv/linux/riscv/multiarch/Makefile | 3 + .../linux/riscv/multiarch/ifunc-impl-list.c | 5 ++ .../sysv/linux/riscv/multiarch/memcmpeq.c | 50 ++++++++++++++ 7 files changed, 189 insertions(+) create mode 100644 sysdeps/riscv/multiarch/memcmpeq-generic.c create mode 100644 sysdeps/riscv/multiarch/memcmpeq-vector.S create mode 100644 sysdeps/riscv/rvv/memcmpeq.S create mode 100644 sysdeps/unix/sysv/linux/riscv/multiarch/memcmpeq.c diff --git a/sysdeps/riscv/multiarch/memcmpeq-generic.c b/sysdeps/riscv/multiarch/memcmpeq-generic.c new file mode 100644 index 0000000000..11ed748d5e --- /dev/null +++ b/sysdeps/riscv/multiarch/memcmpeq-generic.c @@ -0,0 +1,30 @@ +/* Re-include the default memcmpeq implementation. + Copyright (C) 2026 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 + . */ + +#include + +#if IS_IN(libc) +# define MEMCMP ____memcmpeq_generic +# undef libc_hidden_def +# define libc_hidden_def(x) +# undef weak_alias +# define weak_alias(x, x2) +# undef strong_alias +# define strong_alias(x, x2) +# include +#endif diff --git a/sysdeps/riscv/multiarch/memcmpeq-vector.S b/sysdeps/riscv/multiarch/memcmpeq-vector.S new file mode 100644 index 0000000000..8619c9c968 --- /dev/null +++ b/sysdeps/riscv/multiarch/memcmpeq-vector.S @@ -0,0 +1,30 @@ +/* Re-include the RISC-V RVV based memcmpeq implementation. + Copyright (C) 2026 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 + . */ + +#if IS_IN(libc) +# define MEMCMPEQ ____memcmpeq_vector +# undef libc_hidden_builtin_def +# define libc_hidden_builtin_def(name) +# undef libc_hidden_def +# define libc_hidden_def(name) +# undef weak_alias +# define weak_alias(name, alias) +# undef strong_alias +# define strong_alias(name, alias) +# include +#endif diff --git a/sysdeps/riscv/riscv-ifunc.h b/sysdeps/riscv/riscv-ifunc.h index 7782738576..59419f504d 100644 --- a/sysdeps/riscv/riscv-ifunc.h +++ b/sysdeps/riscv/riscv-ifunc.h @@ -25,3 +25,7 @@ #define riscv_libc_ifunc(name, expr) \ __ifunc_args (name, name, expr(hwcap, hwprobe), INIT_ARCH, \ uint64_t hwcap, __riscv_hwprobe_t hwprobe) + +#define riscv_libc_ifunc_redirected(redirected_name, name, expr) \ + __ifunc_args (redirected_name, name, expr(hwcap, hwprobe), INIT_ARCH, \ + uint64_t hwcap, __riscv_hwprobe_t hwprobe) diff --git a/sysdeps/riscv/rvv/memcmpeq.S b/sysdeps/riscv/rvv/memcmpeq.S new file mode 100644 index 0000000000..622c60a8d4 --- /dev/null +++ b/sysdeps/riscv/rvv/memcmpeq.S @@ -0,0 +1,67 @@ +/* RISC-V RVV based memcmpeq. + Copyright (C) 2026 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 + . */ + +#include +#include + +#ifndef MEMCMPEQ +# define MEMCMPEQ ____memcmpeq +#endif + +#define result a0 + +#define src1 a0 +#define src2 a1 +#define num a2 + +#define ivl a3 +#define temp a4 + +#define ELEM_LMUL_SETTING m1 +#define vdata1 v0 +#define vdata2 v8 +#define vmask v16 + +ENTRY (MEMCMPEQ) +.option push +.option arch, +v +L(loop): + vsetvli ivl, num, e8, ELEM_LMUL_SETTING, ta, ma + + vle8.v vdata1, (src1) + vle8.v vdata2, (src2) + + vmsne.vv vmask, vdata1, vdata2 + sub num, num, ivl + vfirst.m temp, vmask + + /* Skip the loop if we find the different value between src1 and src2. */ + bgez temp, L(found) + + add src1, src1, ivl + add src2, src2, ivl + + bnez num, L(loop) + + li result, 0 + ret +L(found): + mv result, ivl + ret +.option pop +END (MEMCMPEQ) diff --git a/sysdeps/unix/sysv/linux/riscv/multiarch/Makefile b/sysdeps/unix/sysv/linux/riscv/multiarch/Makefile index 0edc677874..7cfb4f04dc 100644 --- a/sysdeps/unix/sysv/linux/riscv/multiarch/Makefile +++ b/sysdeps/unix/sysv/linux/riscv/multiarch/Makefile @@ -9,6 +9,9 @@ sysdep_routines += \ memcmp \ memcmp-generic \ memcmp-vector \ + memcmpeq \ + memcmpeq-generic \ + memcmpeq-vector \ memcpy \ memcpy-generic \ memcpy_noalignment \ diff --git a/sysdeps/unix/sysv/linux/riscv/multiarch/ifunc-impl-list.c b/sysdeps/unix/sysv/linux/riscv/multiarch/ifunc-impl-list.c index fe45e043e0..6285a3cf0f 100644 --- a/sysdeps/unix/sysv/linux/riscv/multiarch/ifunc-impl-list.c +++ b/sysdeps/unix/sysv/linux/riscv/multiarch/ifunc-impl-list.c @@ -68,5 +68,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, __memcmp_vector) IFUNC_IMPL_ADD (array, i, memcmp, 1, __memcmp_generic)) + IFUNC_IMPL (i, name, __memcmpeq, + IFUNC_IMPL_ADD (array, i, __memcmpeq, rvv_enabled, + ____memcmpeq_vector) + IFUNC_IMPL_ADD (array, i, __memcmpeq, 1, ____memcmpeq_generic)) + return 0; } diff --git a/sysdeps/unix/sysv/linux/riscv/multiarch/memcmpeq.c b/sysdeps/unix/sysv/linux/riscv/multiarch/memcmpeq.c new file mode 100644 index 0000000000..e2dee7e459 --- /dev/null +++ b/sysdeps/unix/sysv/linux/riscv/multiarch/memcmpeq.c @@ -0,0 +1,50 @@ +/* Multiple versions of __memcmpeq. + All versions must be listed in ifunc-impl-list.c. + Copyright (C) 2026 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 + . */ + +#if IS_IN (libc) +/* Redefine __memcmpeq so that the compiler won't complain about the type + mismatch with the IFUNC selector in strong_alias, below. */ +# define __memcmpeq __redirect___memcmpeq +# include +# include +# undef __memcmpeq +# include +# include +# include + +extern __typeof (__redirect___memcmpeq) ____memcmpeq_generic attribute_hidden; +extern __typeof (__redirect___memcmpeq) ____memcmpeq_vector attribute_hidden; + +static inline __typeof (__redirect___memcmpeq) * +select___memcmpeq_ifunc (uint64_t dl_hwcap, __riscv_hwprobe_t hwprobe_func) +{ + unsigned long long v; + + if (__riscv_hwprobe_one (hwprobe_func, RISCV_HWPROBE_KEY_IMA_EXT_0, &v) == 0 + && (v & RISCV_HWPROBE_IMA_V) == RISCV_HWPROBE_IMA_V) + return ____memcmpeq_vector; + return ____memcmpeq_generic; +} + +riscv_libc_ifunc_redirected (__redirect___memcmpeq, __memcmpeq, select___memcmpeq_ifunc); +# ifdef SHARED +__hidden_ver1 (__memcmpeq, __GI___memcmpeq, __redirect___memcmpeq) + __attribute__ ((visibility ("hidden"))) __attribute_copy__ (__memcmpeq); +# endif +#endif