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