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[2/5] LoongArch: Add LOONGARCH_HAVE_UAL macro

Message ID 20230415112340.38431-3-xry111@xry111.site
State New
Headers show
Series LoongArch: Multiarch string and memory copy routines for unaligned access | expand

Commit Message

Xi Ruoyao April 15, 2023, 11:23 a.m. UTC 
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
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Patch

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 */