diff options
Diffstat (limited to 'lib/librte_eal/common/include/rte_common.h')
| -rw-r--r-- | lib/librte_eal/common/include/rte_common.h | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h index f5e2f886..f17926f3 100644 --- a/lib/librte_eal/common/include/rte_common.h +++ b/lib/librte_eal/common/include/rte_common.h @@ -200,16 +200,7 @@ rte_is_aligned(void *ptr, unsigned align) /** * Triggers an error at compilation time if the condition is true. */ -#ifndef __OPTIMIZE__ #define RTE_BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) -#else -extern int RTE_BUILD_BUG_ON_detected_error; -#define RTE_BUILD_BUG_ON(condition) do { \ - ((void)sizeof(char[1 - 2*!!(condition)])); \ - if (condition) \ - RTE_BUILD_BUG_ON_detected_error = 1; \ -} while(0) -#endif /*********** Macros to work with powers of 2 ********/ @@ -326,6 +317,23 @@ rte_bsf32(uint32_t v) return (uint32_t)__builtin_ctz(v); } +/** + * Return the last (most-significant) bit set. + * + * @note The last (most significant) bit is at position 32. + * @note rte_fls_u32(0) = 0, rte_fls_u32(1) = 1, rte_fls_u32(0x80000000) = 32 + * + * @param x + * The input parameter. + * @return + * The last (most-significant) bit set, or 0 if the input is 0. + */ +static inline int +rte_fls_u32(uint32_t x) +{ + return (x == 0) ? 0 : 32 - __builtin_clz(x); +} + #ifndef offsetof /** Return the offset of a field in a structure. */ #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER) |