51 lines
2 KiB
C
51 lines
2 KiB
C
// Copyright 2016-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#else
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#define likely(x) (x)
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#define unlikely(x) (x)
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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 |