diff options
Diffstat (limited to 'libc/sysdeps/linux/v850/bits/byteswap.h')
| -rw-r--r-- | libc/sysdeps/linux/v850/bits/byteswap.h | 50 |
1 files changed, 27 insertions, 23 deletions
diff --git a/libc/sysdeps/linux/v850/bits/byteswap.h b/libc/sysdeps/linux/v850/bits/byteswap.h index b5b07209f..44fbee488 100644 --- a/libc/sysdeps/linux/v850/bits/byteswap.h +++ b/libc/sysdeps/linux/v850/bits/byteswap.h @@ -16,44 +16,48 @@ #endif /* Swap bytes in 16 bit value. */ +#define __bswap_constant_16(x) \ + ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)) + #ifdef __GNUC__ # define __bswap_16(x) \ (__extension__ \ - ({ unsigned short int __bsh_val = (x); \ - __asm__ ("bsh %1, %0" : "=r" (__bsh_val) : "r" (__bsh_val)); \ - __bsh_val; })) + ({ unsigned long int __bswap_16_v; \ + if (__builtin_constant_p (x)) \ + __bswap_16_v = __bswap_constant_16 (x); \ + else \ + __asm__ ("bsh %1, %0" : "=r" (__bswap_16_v) : "r" (x)); \ + __bswap_16_v; })) #else -static __inline unsigned short int -__bswap_16 (unsigned short int __bsx) -{ - return ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8)); -} +# define __bswap_16(x) __bswap_constant_16 (x) #endif /* Swap bytes in 32 bit value. */ +#define __bswap_constant_32(x) \ + ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \ + (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24)) + #ifdef __GNUC__ # define __bswap_32(x) \ (__extension__ \ - ({ unsigned short int __bsw_val = (x); \ - __asm__ ("bsw %1, %0" : "=r" (__bsw_val) : "r" (__bsw_val)); \ - __bsw_val; })) + ({ unsigned long int __bswap_32_v; \ + if (__builtin_constant_p (x)) \ + __bswap_32_v = __bswap_constant_32 (x); \ + else \ + __asm__ ("bsw %1, %0" : "=r" (__bswap_32_v) : "r" (x)); \ + __bswap_32_v; })) #else -static __inline unsigned int -__bswap_32 (unsigned int __bsx) -{ - return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) | - (((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24)); -} +# define __bswap_32(x) __bswap_constant_32 (x) #endif #if defined __GNUC__ && __GNUC__ >= 2 /* Swap bytes in 64 bit value. */ -# define __bswap_64(x) \ +# define __bswap_64(x) \ (__extension__ \ ({ union { unsigned long long int __ll; \ - unsigned long int __l[2]; } __v, __r; \ - __v.__ll = (x); \ - __r.__l[0] = __bswap_32 (__v.__l[1]); \ - __r.__l[1] = __bswap_32 (__v.__l[0]); \ - __r.__ll; })) + unsigned long int __l[2]; } __bswap_64_v, __bswap_64_r; \ + __bswap_64_v.__ll = (x); \ + __bswap_64_r.__l[0] = __bswap_32 (__bswap_64_v.__l[1]); \ + __bswap_64_r.__l[1] = __bswap_32 (__bswap_64_v.__l[0]); \ + __bswap_64_r.__ll; })) #endif |