kopia lustrzana https://github.com/espressif/esp-idf
33 wiersze
1.1 KiB
C
33 wiersze
1.1 KiB
C
// Copyright 2016-2019 Espressif Systems (Shanghai) PTE LTD
|
|
//
|
|
// 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.
|
|
#ifndef __ESP_COMPILER_H
|
|
#define __ESP_COMPILER_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)
|
|
#define likely(x) __builtin_expect(!!(x), 1)
|
|
#define unlikely(x) __builtin_expect(!!(x), 0)
|
|
#else
|
|
#define likely(x) (x)
|
|
#define unlikely(x) (x)
|
|
#endif
|
|
|
|
#endif |