[2/5] LoongArch: Add LOONGARCH_HAVE_UAL macro
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Commit Message
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
new file mode 100644
@@ -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 */
new file mode 100644
@@ -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 */