esp-idf/components/esp_common/include/esp_compiler.h

55 wiersze
1.8 KiB
C

/*
* SPDX-FileCopyrightText: 2016-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include "sdkconfig.h"
/*
* The likely and unlikely macro pairs:
* These macros are useful to place when application
* knows the majority ocurrence of a decision paths,
* placing one of these macros can hint the compiler
* to reorder instructions producing more optimized
* code.
*/
#if (CONFIG_COMPILER_OPTIMIZATION_PERF)
#ifndef likely
#define likely(x) __builtin_expect(!!(x), 1)
#endif
#ifndef unlikely
#define unlikely(x) __builtin_expect(!!(x), 0)
#endif
#else
#ifndef likely
#define likely(x) (x)
#endif
#ifndef unlikely
#define unlikely(x) (x)
#endif
#endif
/*
* Utility macros used for designated initializers, which work differently
* in C99 and C++ standards mainly for aggregate types.
* The member separator, comma, is already part of the macro, please omit the trailing comma.
* Usage example:
* struct config_t { char* pchr; char arr[SIZE]; } config = {
* ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(pchr)
* ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_STR(arr, "Value")
* };
*/
#if defined(__cplusplus) && __cplusplus >= 202002L
#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_STR(member, value) .member = value,
#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(member) .member = { },
#elif defined(__cplusplus) && __cplusplus < 202002L
#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_STR(member, value) { .member = value },
#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(member) .member = { },
#else
#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_STR(member, value) .member = value,
#define ESP_COMPILER_DESIGNATED_INIT_AGGREGATE_TYPE_EMPTY(member)
#endif