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#include <stdint.h>
#ifndef _BUILTINS_H
#define _BUILTINS_H
#ifdef __cplusplus
extern "C"
{
#endif
/**
* This file should be the home of any use of gcc compiler builtins
*/
/**
* Use of this macro will ensure that the functions object code never gets generated without being inlined
*/
#define ALWAYS_INLINE __attribute__((always_inline))
/**
* Use of this macro will ensure a data structure is aligned on a cacheline boundary
*/
#define ALIGN_CACHELINE __attribute__((aligned (128)))
/**
* Function declaration macro that tells the compiler to use printf format checking semantics
*
* TODO Could make this a function macro and pass in the 3 args rather than hard coding
*/
#define FORMAT_PRINTF __attribute__((format(printf, 1, 2)))
/**
* Function delaration macro that tells the compiler that this function never returns.
*/
#define NO_RETURN __attribute__((noreturn))
/**
* Function / variable declaration macro that tells the compiler what section this symbol should go into.
*/
#define SYMB_SECTION(x) __attribute__((section(#x)))
/**
* Use of this macro will ensure a data structure is not padded
*/
#define PACKED __attribute__((packed))
/**
* Compiler hint for branch conditions. "condition is likely to be true"
*/
#define likely(expr) __builtin_expect((expr),1)
/**
* Compiler hint for branch conditions. "condition is likely to be false"
*/
#define unlikely(expr) __builtin_expect((expr),0)
/**
* Get the value of the link register
*
* @return the value of the link register
*/
ALWAYS_INLINE
static inline void *linkRegister()
{
return __builtin_return_address(0);
}
/**
* Get the value of the stack-frame pointer
*
* @return The value of the frame pointer.
*/
ALWAYS_INLINE
static inline void *framePointer()
{
return __builtin_frame_address(0);
}
/**
* Counts leading zeros of a uint64_t value
*
* @param value to check
*
* @return the number of leading zeros
*/
ALWAYS_INLINE
static inline uint64_t cntlzd(uint64_t value)
{
return __builtin_clzl(value);
}
/**
* Counts trailing zeros of a uint64_t value
*
* @param value to check
*
* @return the number of trailing zeros
*/
ALWAYS_INLINE
static inline uint64_t cnttzd(uint64_t value)
{
return __builtin_ctzl(value);
}
#ifdef __cplusplus
};
#endif
#endif
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