/******* Macro to mark functions and fields scheduled for removal *****/
#define __rte_deprecated __attribute__((__deprecated__))
+/**
+ * Mark a function or variable to a weak reference.
+ */
+#define __rte_weak __attribute__((__weak__))
+
/*********** Macros to eliminate unused variable warnings ********/
/**
*/
#define RTE_PTR_DIFF(ptr1, ptr2) ((uintptr_t)(ptr1) - (uintptr_t)(ptr2))
+/**
+ * Workaround to cast a const field of a structure to non-const type.
+ */
+#define RTE_CAST_FIELD(var, field, type) \
+ (*(type *)((uintptr_t)(var) + offsetof(typeof(*(var)), field)))
+
/*********** Macros/static functions for doing alignment ********/
/**
* 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
/**
* Combines 32b inputs most significant set bits into the least
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);
+}
+
+/**
+ * Searches the input parameter for the least significant set bit
+ * (starting from zero). Safe version (checks for input parameter being zero).
+ *
+ * @warning ``pos`` must be a valid pointer. It is not checked!
+ *
+ * @param v
+ * The input parameter.
+ * @param pos
+ * If ``v`` was not 0, this value will contain position of least significant
+ * bit within the input parameter.
+ * @return
+ * Returns 0 if ``v`` was 0, otherwise returns 1.
+ */
+static inline int
+rte_bsf64_safe(uint64_t v, uint32_t *pos)
+{
+ if (v == 0)
+ return 0;
+
+ *pos = __builtin_ctzll(v);
+ return 1;
+}
+
#ifndef offsetof
/** Return the offset of a field in a structure. */
#define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)