diff mbox series

[RFC,13/19] riscv: Add ifunc support for strlen

Message ID	20230207001618.458947-14-christoph.muellner@vrull.eu
State	New
Headers	DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 2CB103858425 From: Christoph Muellner <christoph.muellner@vrull.eu> To: libc-alpha@sourceware.org, Palmer Dabbelt <palmer@dabbelt.com>, Darius Rad <darius@bluespec.com>, Andrew Waterman <andrew@sifive.com>, DJ Delorie <dj@redhat.com>, Vineet Gupta <vineetg@rivosinc.com>, Kito Cheng <kito.cheng@sifive.com>, Jeff Law <jeffreyalaw@gmail.com>, Philipp Tomsich <philipp.tomsich@vrull.eu>, Heiko Stuebner <heiko.stuebner@vrull.eu> Cc: =?utf-8?q?Christoph_M=C3=BCllner?= <christoph.muellner@vrull.eu> Subject: [RFC PATCH 13/19] riscv: Add ifunc support for strlen Date: Tue, 7 Feb 2023 01:16:12 +0100 Message-Id: <20230207001618.458947-14-christoph.muellner@vrull.eu> In-Reply-To: <20230207001618.458947-1-christoph.muellner@vrull.eu> References: <20230207001618.458947-1-christoph.muellner@vrull.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: list Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" <libc-alpha-bounces+patchwork=sourceware.org@sourceware.org>
Series	riscv: ifunc support with optimized mem/str/cpu_relax routines \| [RFC,00/19] riscv: ifunc support with optimized mem/str/cpu_relax routines [RFC,01/19] Inhibit early libcalls before ifunc support is ready [RFC,02/19] riscv: LEAF: Use C_LABEL() to construct the asm name for a C symbol [RFC,03/19] riscv: Add ENTRY_ALIGN() macro [RFC,04/19] riscv: Add hart feature run-time detection framework [RFC,05/19] riscv: Introduction of ISA extensions [RFC,06/19] riscv: Adding ISA string parser for environment variables [RFC,07/19] riscv: hart-features: Add fast_unaligned property [RFC,08/19] riscv: Add (empty) ifunc framework [RFC,09/19] riscv: Add ifunc support for memset [RFC,10/19] riscv: Add accelerated memset routines for RV64 [RFC,11/19] riscv: Add ifunc support for memcpy/memmove [RFC,12/19] riscv: Add accelerated memcpy/memmove routines for RV64 [RFC,13/19] riscv: Add ifunc support for strlen [RFC,14/19] riscv: Add accelerated strlen routine [RFC,15/19] riscv: Add ifunc support for strcmp [RFC,16/19] riscv: Add accelerated strcmp routines [RFC,17/19] riscv: Add ifunc support for strncmp [RFC,18/19] riscv: Add an optimized strncmp routine [RFC,19/19] riscv: Add __riscv_cpu_relax() to allow yielding in busy loops

Checks

Context	Check	Description
dj/TryBot-apply_patch	success	Patch applied to master at the time it was sent

Commit Message

Christoph Müllner Feb. 7, 2023, 12:16 a.m. UTC

  From: Christoph Müllner <christoph.muellner@vrull.eu>

This patch adds ifunc support for calls to strlen to the RISC-V code.
No optimized code is added as part of this patch.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>
---
 sysdeps/riscv/multiarch/Makefile          |  4 ++-
 sysdeps/riscv/multiarch/ifunc-impl-list.c |  4 +++
 sysdeps/riscv/multiarch/strlen.c          | 40 +++++++++++++++++++++++
 sysdeps/riscv/multiarch/strlen_generic.c  | 32 ++++++++++++++++++
 4 files changed, 79 insertions(+), 1 deletion(-)
 create mode 100644 sysdeps/riscv/multiarch/strlen.c
 create mode 100644 sysdeps/riscv/multiarch/strlen_generic.c

diff mbox series

Patch

diff --git a/sysdeps/riscv/multiarch/Makefile b/sysdeps/riscv/multiarch/Makefile
index b08d7d1c8b..8e2b020233 100644
--- a/sysdeps/riscv/multiarch/Makefile
+++ b/sysdeps/riscv/multiarch/Makefile
@@ -6,5 +6,7 @@  sysdep_routines += \
 	\
 	memset_generic \
 	memset_rv64_unaligned \
-	memset_rv64_unaligned_cboz64
+	memset_rv64_unaligned_cboz64 \
+	\
+	strlen_generic
 endif
diff --git a/sysdeps/riscv/multiarch/ifunc-impl-list.c b/sysdeps/riscv/multiarch/ifunc-impl-list.c
index 84b3eb25a4..f848fc8401 100644
--- a/sysdeps/riscv/multiarch/ifunc-impl-list.c
+++ b/sysdeps/riscv/multiarch/ifunc-impl-list.c
@@ -54,5 +54,9 @@  __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 #endif
 	      IFUNC_IMPL_ADD (array, i, memset, 1, __memset_generic))
 
+  IFUNC_IMPL (i, name, strlen,
+	      IFUNC_IMPL_ADD (array, i, strlen, 1, __strlen_generic))
+
+
   return i;
 }
diff --git a/sysdeps/riscv/multiarch/strlen.c b/sysdeps/riscv/multiarch/strlen.c
new file mode 100644
index 0000000000..85f7a91c9f
--- /dev/null
+++ b/sysdeps/riscv/multiarch/strlen.c
@@ -0,0 +1,40 @@ 
+/* Multiple versions of strlen. RISC-V 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* Define multiple versions only for the definition in libc.  */
+
+#if IS_IN (libc)
+/* Redefine strlen so that the compiler won't complain about the type
+   mismatch with the IFUNC selector in strong_alias, below.  */
+# undef strlen
+# define strlen __redirect_strlen
+# include <string.h>
+# include <ldsodefs.h>
+# include <sys/auxv.h>
+# include <init-arch.h>
+
+extern __typeof (__redirect_strlen) __libc_strlen;
+extern __typeof (__redirect_strlen) __strlen_generic attribute_hidden;
+
+libc_ifunc (__libc_strlen, __strlen_generic);
+
+# undef strlen
+strong_alias (__libc_strlen, strlen);
+#else
+# include <string/strlen.c>
+#endif
diff --git a/sysdeps/riscv/multiarch/strlen_generic.c b/sysdeps/riscv/multiarch/strlen_generic.c
new file mode 100644
index 0000000000..10aa05e699
--- /dev/null
+++ b/sysdeps/riscv/multiarch/strlen_generic.c
@@ -0,0 +1,32 @@ 
+/* strlen for RISC-V, default version for internal use.
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <string.h>
+
+#define STRLEN __strlen_generic
+
+#ifdef SHARED
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name) \
+  __hidden_ver1(__strlen_generic, __GI_strlen, __strlen_generic);
+#endif
+
+extern size_t __strlen_generic(const char *str);
+
+#include <string/strlen.c>