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-rw-r--r--sys/sys/cdefs.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
index 75bedd4b8128..72ef942084f2 100644
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@@ -884,4 +884,23 @@
#define __guarded_by(x) __lock_annotate(guarded_by(x))
#define __pt_guarded_by(x) __lock_annotate(pt_guarded_by(x))
+/* Alignment builtins for better type checking and improved code generation. */
+/* Provide fallback versions for other compilers (GCC/Clang < 10): */
+#if !__has_builtin(__builtin_is_aligned)
+#define __builtin_is_aligned(x, align) \
+ (((__uintptr_t)x & ((align) - 1)) == 0)
+#endif
+#if !__has_builtin(__builtin_align_up)
+#define __builtin_align_up(x, align) \
+ ((__typeof__(x))(((__uintptr_t)(x)+((align)-1))&(~((align)-1))))
+#endif
+#if !__has_builtin(__builtin_align_down)
+#define __builtin_align_down(x, align) \
+ ((__typeof__(x))((x)&(~((align)-1))))
+#endif
+
+#define __align_up(x, y) __builtin_align_up(x, y)
+#define __align_down(x, y) __builtin_align_down(x, y)
+#define __is_aligned(x, y) __builtin_is_aligned(x, y)
+
#endif /* !_SYS_CDEFS_H_ */