diff options
| author | Mike Frysinger <vapier@gentoo.org> | 2009-07-20 16:38:30 -0400 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-07-21 22:26:05 -0400 |
| commit | 6ca56dd4d711c731d010c484c20384097615f6cd (patch) | |
| tree | 71ae0f7709dc2841f9ebf10f18e7ee182ee15624 /libc/sysdeps/linux/m68k/bits/byteswap.h | |
| parent | 4a2724d93bcd8626f2cebead9b263b4f9f86541d (diff) | |
byteswap: unify common definitions
The majority of the byteswap functions are the same across all arches, so
setup a common header to provide definitions if they don't exist. This
allows arches to override only the ones they actually want to implement
with inline assembly.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'libc/sysdeps/linux/m68k/bits/byteswap.h')
| -rw-r--r-- | libc/sysdeps/linux/m68k/bits/byteswap.h | 50 |
1 files changed, 10 insertions, 40 deletions
diff --git a/libc/sysdeps/linux/m68k/bits/byteswap.h b/libc/sysdeps/linux/m68k/bits/byteswap.h index f5ec91682..488474212 100644 --- a/libc/sysdeps/linux/m68k/bits/byteswap.h +++ b/libc/sysdeps/linux/m68k/bits/byteswap.h @@ -17,51 +17,21 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ -#if !defined _BYTESWAP_H && !defined _NETINET_IN_H -# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." -#endif - -#ifndef _BITS_BYTESWAP_H -#define _BITS_BYTESWAP_H 1 - -/* Swap bytes in 16 bit value. We don't provide an assembler version - because GCC is smart enough to generate optimal assembler output, and - this allows for better cse. */ -#define __bswap_16(x) \ - ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)) - -/* Swap bytes in 32 bit value. */ -#define __bswap_constant_32(x) \ - ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \ - (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24)) +#ifndef _ASM_BITS_BYTESWAP_H +#define _ASM_BITS_BYTESWAP_H 1 -#if defined __GNUC__ && __GNUC__ >= 2 && !defined __mcoldfire__ -# define __bswap_32(x) \ +#if !defined __mcoldfire__ +# define __bswap_non_constant_32(x) \ __extension__ \ ({ unsigned int __bswap_32_v; \ - if (__builtin_constant_p (x)) \ - __bswap_32_v = __bswap_constant_32 (x); \ - else \ - __asm__ __volatile__ ("ror%.w %#8, %0;" \ - "swap %0;" \ - "ror%.w %#8, %0" \ - : "=d" (__bswap_32_v) \ - : "0" ((unsigned int) (x))); \ + __asm__ __volatile__ ("ror%.w %#8, %0;" \ + "swap %0;" \ + "ror%.w %#8, %0" \ + : "=d" (__bswap_32_v) \ + : "0" ((unsigned int) (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_64(x) \ - __extension__ \ - ({ union { unsigned long long int __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 -#endif /* _BITS_BYTESWAP_H */ +#include <bits/byteswap-common.h> |