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diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
--- 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_ */
diff --git a/sys/sys/param.h b/sys/sys/param.h
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -305,9 +305,9 @@
#endif
#define nitems(x) (sizeof((x)) / sizeof((x)[0]))
#define rounddown(x, y) (((x)/(y))*(y))
-#define rounddown2(x, y) ((x)&(~((y)-1))) /* if y is power of two */
+#define rounddown2(x, y) __align_down(x, y) /* if y is power of two */
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
-#define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
+#define roundup2(x, y) __align_up(x, y) /* if y is powers of two */
#define powerof2(x) ((((x)-1)&(x))==0)
/* Macros for min/max. */

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