diff options
Diffstat (limited to 'libc/sysdeps')
| -rw-r--r-- | libc/sysdeps/linux/cris/bits/byteswap.h | 74 |
1 files changed, 41 insertions, 33 deletions
diff --git a/libc/sysdeps/linux/cris/bits/byteswap.h b/libc/sysdeps/linux/cris/bits/byteswap.h index e35c4b63f..4027456ac 100644 --- a/libc/sysdeps/linux/cris/bits/byteswap.h +++ b/libc/sysdeps/linux/cris/bits/byteswap.h @@ -1,51 +1,56 @@ #ifndef _BITS_BYTESWAP_H #define _BITS_BYTESWAP_H 1 -#define ___swab16(x) \ +/* CRIS specific byte swap operations: 16, 32 and 64-bit */ + +/* Swap bytes in 16 bit value. */ +#define __bswap_constant_16(x) \ ({ \ unsigned short __x = (x); \ ((unsigned short)( \ - (((unsigned short)(__x) & (unsigned short)0x00ffU) << 8) | \ - (((unsigned short)(__x) & (unsigned short)0xff00U) >> 8) )); \ + (((unsigned short)(__x) & (unsigned short)0x00ffu) << 8) | \ + (((unsigned short)(__x) & (unsigned short)0xff00u) >> 8) )); \ }) -#define ___swab32(x) \ +#if defined __GNUC__ && __GNUC__ >= 2 +# define __bswap_16(x) \ + __extension__ \ + ({ unsigned short __bswap_16_v; \ + if (__builtin_constant_p (x)) \ + __bswap_16_v = __bswap_constant_16 (x); \ + else \ + __asm__ ("swapb %0" : "=r" (__bswap_16_v) : "0" (x)); \ + __bswap_16_v; }) +#else +# define __bswap_16(x) __bswap_constant_16 (x) +#endif + + +/* Swap bytes in 32 bit value. */ +#define __bswap_constant_32(x) \ ({ \ unsigned long __x = (x); \ ((unsigned long)( \ - (((unsigned long)(__x) & (unsigned long)0x000000ffUL) << 24) | \ - (((unsigned long)(__x) & (unsigned long)0x0000ff00UL) << 8) | \ - (((unsigned long)(__x) & (unsigned long)0x00ff0000UL) >> 8) | \ - (((unsigned long)(__x) & (unsigned long)0xff000000UL) >> 24) )); \ + (((unsigned long)(__x) & (unsigned long)0x000000fful) << 24) | \ + (((unsigned long)(__x) & (unsigned long)0x0000ff00ul) << 8) | \ + (((unsigned long)(__x) & (unsigned long)0x00ff0000ul) >> 8) | \ + (((unsigned long)(__x) & (unsigned long)0xff000000ul) >> 24) )); \ }) -/* these are CRIS specific */ - -static inline unsigned short __fswab16(unsigned short x) -{ - __asm__ ("swapb %0" : "=r" (x) : "0" (x)); - - return(x); -} - -static inline unsigned long __fswab32(unsigned long x) -{ - __asm__ ("swapwb %0" : "=r" (x) : "0" (x)); - - return(x); -} - -# define __bswap_16(x) \ -(__builtin_constant_p((unsigned short)(x)) ? \ - ___swab16((x)) : \ - __fswab16((x))) - +#if defined __GNUC__ && __GNUC__ >= 2 # define __bswap_32(x) \ -(__builtin_constant_p((unsigned long)(x)) ? \ - ___swab32((x)) : \ - __fswab32((x))) + __extension__ \ + ({ unsigned long __bswap_32_v; \ + if (__builtin_constant_p (x)) \ + __bswap_32_v = __bswap_constant_32 (x); \ + else \ + __asm__ ("swapwb %0" : "=r" (__bswap_32_v) : "0" (x)); \ + __bswap_32_v; }) +#else +# define __bswap_32(x) __bswap_constant_32 (x) +#endif + -#if defined __GNUC__ && __GNUC__ >= 2 /* Swap bytes in 64 bit value. */ # define __bswap_constant_64(x) \ ((((x) & 0xff00000000000000ull) >> 56) \ @@ -57,6 +62,7 @@ static inline unsigned long __fswab32(unsigned long x) | (((x) & 0x000000000000ff00ull) << 40) \ | (((x) & 0x00000000000000ffull) << 56)) +#if defined __GNUC__ && __GNUC__ >= 2 # define __bswap_64(x) \ (__extension__ \ ({ union { __extension__ unsigned long long int __ll; \ @@ -70,6 +76,8 @@ static inline unsigned long __fswab32(unsigned long x) __r.__l[1] = __bswap_32 (__w.__l[0]); \ } \ __r.__ll; })) +#else +# define __bswap_64(x) __bswap_constant_64 (x) #endif #endif /* _BITS_BYTESWAP_H */ |