1 #pragma once
2 
3 #include <features.h>
4 #include <stdint.h>
5 
__bswap_16(uint16_t __x)6 static __inline uint16_t __bswap_16(uint16_t __x) {
7     return __x << 8 | __x >> 8;
8 }
9 
__bswap_32(uint32_t __x)10 static __inline uint32_t __bswap_32(uint32_t __x) {
11     return __x >> 24 | ((__x >> 8) & 0xff00) | ((__x << 8) & 0xff0000) |
12            __x << 24;
13 }
14 
__bswap_64(uint64_t __x)15 static __inline uint64_t __bswap_64(uint64_t __x) {
16     return ((uint64_t)__bswap_32(__x)) << 32 | __bswap_32(__x >> 32);
17 }
18 
19 #define bswap_16(x) __bswap_16(x)
20 #define bswap_32(x) __bswap_32(x)
21 #define bswap_64(x) __bswap_64(x)
22