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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/include/builtins.h $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* COPYRIGHT International Business Machines Corp. 2011,2014 */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
#include <stdint.h>
#ifndef _BUILTINS_H
#define _BUILTINS_H
#include <util/pp/for_each.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 that a function is never inlined.
*/
#define NEVER_INLINE __attribute__((noinline))
/**
* 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))
/**
* Use of this macro will hide compile errors when a variable is not used,
* usually because it is used in debug / assert statements only.
*/
#define SUPPRESS_UNUSED_VARIABLE(...) \
PREPROCESSOR_FOR_EACH((void),##__VA_ARGS__)
/**
* 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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