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Index: head/sys/sys/bitset.h
===================================================================
--- head/sys/sys/bitset.h
+++ head/sys/sys/bitset.h
@@ -34,12 +34,19 @@
#ifndef _SYS_BITSET_H_
#define _SYS_BITSET_H_
+/*
+ * Whether expr is both constant and true. Result is itself constant.
+ * Used to enable optimizations for sets with a known small size.
+ */
+#define __constexpr_cond(expr) (__builtin_constant_p((expr)) && (expr))
+
#define __bitset_mask(_s, n) \
- (1L << ((__bitset_words((_s)) == 1) ? \
+ (1L << (__constexpr_cond(__bitset_words((_s)) == 1) ? \
(__size_t)(n) : ((n) % _BITSET_BITS)))
#define __bitset_word(_s, n) \
- ((__bitset_words((_s)) == 1) ? 0 : ((n) / _BITSET_BITS))
+ (__constexpr_cond(__bitset_words((_s)) == 1) ? \
+ 0 : ((n) / _BITSET_BITS))
#define BIT_CLR(_s, n, p) \
((p)->__bits[__bitset_word(_s, n)] &= ~__bitset_mask((_s), (n)))

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