From af7fcbb9f619b3759618cc1d76972aa921939e9e Mon Sep 17 00:00:00 2001
From: ngie <ngie@FreeBSD.org>
Date: Sat, 4 Feb 2017 16:09:07 +0000
Subject: MFC r311972:

Add __BIT and __BITS macros from NetBSD to help support new testcases
---
 lib/libnetbsd/sys/cdefs.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/libnetbsd/sys/cdefs.h b/lib/libnetbsd/sys/cdefs.h
index 051959f..06e46fd 100644
--- a/lib/libnetbsd/sys/cdefs.h
+++ b/lib/libnetbsd/sys/cdefs.h
@@ -69,4 +69,13 @@
  */
 #define	__arraycount(__x)	(sizeof(__x) / sizeof(__x[0]))
 
+/* __BIT(n): nth bit, where __BIT(0) == 0x1. */
+#define	__BIT(__n)	\
+    (((uintmax_t)(__n) >= NBBY * sizeof(uintmax_t)) ? 0 : \
+    ((uintmax_t)1 << (uintmax_t)((__n) & (NBBY * sizeof(uintmax_t) - 1))))
+
+/* __BITS(m, n): bits m through n, m < n. */
+#define	__BITS(__m, __n)	\
+	((__BIT(MAX((__m), (__n)) + 1) - 1) ^ (__BIT(MIN((__m), (__n))) - 1))
+
 #endif /* _LIBNETBSD_SYS_CDEFS_H_ */
-- 
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