From 7d328b544621d4b1bec936dec612947ad8bfb65a Mon Sep 17 00:00:00 2001 From: Zbigniew Jędrzejewski-Szmek Date: Sun, 1 Feb 2015 15:26:46 -0500 Subject: shared/capability: go frugal on space for caps --- src/shared/util.h | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'src/shared/util.h') diff --git a/src/shared/util.h b/src/shared/util.h index 5312422134..410ce65f14 100644 --- a/src/shared/util.h +++ b/src/shared/util.h @@ -860,7 +860,7 @@ static inline unsigned u32ctz(uint32_t n) { #endif } -static inline int log2i(int x) { +static inline unsigned log2i(int x) { assert(x > 0); return __SIZEOF_INT__ * 8 - __builtin_clz(x) - 1; @@ -872,6 +872,16 @@ static inline unsigned log2u(unsigned x) { return sizeof(unsigned) * 8 - __builtin_clz(x) - 1; } +static inline unsigned log2u64(uint64_t x) { + assert(x > 0); + +#if __SIZEOF_LONG_LONG__ == 8 + return 64 - __builtin_clzll(x) - 1; +#else +#error "Wut?" +#endif +} + static inline unsigned log2u_round_up(unsigned x) { assert(x > 0); -- cgit v1.2.3-54-g00ecf