From: Xi Ruoyao <xry111@xry111.site>
To: libc-alpha@sourceware.org
Cc: caiyinyu <caiyinyu@loongson.cn>, Wang Xuerui <i@xen0n.name>,
Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>,
Xi Ruoyao <xry111@xry111.site>
Subject: [PATCH 2/5] LoongArch: Add LOONGARCH_HAVE_UAL macro
Date: Sat, 15 Apr 2023 19:23:37 +0800 [thread overview]
Message-ID: <20230415112340.38431-3-xry111@xry111.site> (raw)
In-Reply-To: <20230415112340.38431-1-xry111@xry111.site>
On Linux, we can determine if the CPU supports unaligned access via
HWCAP. Otherwise, we conservatively assume the CPU does not support
unaligned access.
Maybe we should add a built-in macro for GCC to tell if
-m[no-]strict-align is used, but it won't happen for GCC 12 and 13.
---
sysdeps/loongarch/loongarch-features.h | 26 ++++++++++++++++
.../sysv/linux/loongarch/loongarch-features.h | 30 +++++++++++++++++++
2 files changed, 56 insertions(+)
create mode 100644 sysdeps/loongarch/loongarch-features.h
create mode 100644 sysdeps/unix/sysv/linux/loongarch/loongarch-features.h
diff --git a/sysdeps/loongarch/loongarch-features.h b/sysdeps/loongarch/loongarch-features.h
new file mode 100644
index 0000000000..722b4b61dc
--- /dev/null
+++ b/sysdeps/loongarch/loongarch-features.h
@@ -0,0 +1,26 @@
+/* Macros to test for CPU features on LoongArch.
+ 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
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _LOONGARCH_LOONGARCH_FEATURES_H
+#define _LOONGARCH_LOONGARCH_FEATURES_H 1
+
+#ifndef LOONGARCH_HAVE_UAL
+# define LOONGARCH_HAVE_UAL 0
+#endif
+
+#endif /* loongarch-features.h */
diff --git a/sysdeps/unix/sysv/linux/loongarch/loongarch-features.h b/sysdeps/unix/sysv/linux/loongarch/loongarch-features.h
new file mode 100644
index 0000000000..d4c18d3cfe
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/loongarch/loongarch-features.h
@@ -0,0 +1,30 @@
+/* Macros to test for CPU features on LoongArch. Linux 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
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _LINUX_LOONGARCH_FEATURES_H
+#define _LINUX_LOONGARCH_FEATURES_H 1
+
+#ifndef __ASSEMBLER__
+# include <ldsodefs.h>
+
+# define LOONGARCH_HAVE_UAL (GLRO (dl_hwcap) & HWCAP_LOONGARCH_UAL)
+#endif
+
+#include_next <loongarch-features.h>
+
+#endif /* loongarch-features.h */
--
2.39.2
next prev parent reply other threads:[~2023-04-15 11:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-15 11:23 [PATCH 0/5] LoongArch: Multiarch string and memory copy routines for unaligned access Xi Ruoyao
2023-04-15 11:23 ` [PATCH 1/5] LoongArch: Add bits/hwcap.h for Linux Xi Ruoyao
2023-04-15 11:23 ` Xi Ruoyao [this message]
2023-04-15 11:23 ` [PATCH 3/5] string: stpcpy.c: Only alias __stpcpy to stpcpy if STPCPY undefined Xi Ruoyao
2023-04-15 11:23 ` [PATCH 4/5] LoongArch: Multiarch stpcpy for unaligned access Xi Ruoyao
2023-04-15 11:23 ` [PATCH 5/5] LoongArch: Multiarch memcpy " Xi Ruoyao
2023-04-18 3:01 ` [PATCH 0/5] LoongArch: Multiarch string and memory copy routines " caiyinyu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230415112340.38431-3-xry111@xry111.site \
--to=xry111@xry111.site \
--cc=adhemerval.zanella@linaro.org \
--cc=caiyinyu@loongson.cn \
--cc=i@xen0n.name \
--cc=libc-alpha@sourceware.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).