diff options
author | Christian Ehrhardt <christian.ehrhardt@canonical.com> | 2019-02-26 09:17:37 +0100 |
---|---|---|
committer | Christian Ehrhardt <christian.ehrhardt@canonical.com> | 2019-02-26 09:21:27 +0100 |
commit | 597cb1874068054d4c0be41f161a72ef37888930 (patch) | |
tree | 8899c19634bd8e393a8eac05f33925e4d75bd77d /lib/librte_eal/common/include/rte_common.h | |
parent | 6e7cbd63706f3435b9d9a2057a37db1da01db9a7 (diff) |
New upstream version 17.11.5upstream-17.11-stable
Change-Id: I8d2aa1aee2a9a78614dff5a01008f91e88e810c7
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Diffstat (limited to 'lib/librte_eal/common/include/rte_common.h')
-rw-r--r-- | lib/librte_eal/common/include/rte_common.h | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h index f1d24b86..4485d634 100644 --- a/lib/librte_eal/common/include/rte_common.h +++ b/lib/librte_eal/common/include/rte_common.h @@ -241,16 +241,7 @@ 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 ********/ @@ -349,7 +340,7 @@ rte_align64pow2(uint64_t v) static inline uint32_t rte_bsf32(uint32_t v) { - return __builtin_ctz(v); + return (uint32_t)__builtin_ctz(v); } /** @@ -369,6 +360,25 @@ rte_log2_u32(uint32_t v) return rte_bsf32(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) |