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/* $MidnightBSD$ */ |
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/* $MidnightBSD: src/sys/i386/include/endian.h,v 1.3 2012/03/31 17:05:09 laffer1 Exp $ */ |
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/*- |
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* Copyright (c) 1987, 1991 Regents of the University of California. |
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* All rights reserved. |
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* SUCH DAMAGE. |
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* |
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* @(#)endian.h 7.8 (Berkeley) 4/3/91 |
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* $FreeBSD: src/sys/i386/include/endian.h,v 1.41 2005/03/02 21:33:26 joerg Exp $ |
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* $FreeBSD$ |
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*/ |
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#ifndef _MACHINE_ENDIAN_H_ |
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#if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE_BUILTIN_CONSTANT_P) |
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#define __byte_swap_int_var(x) \ |
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__extension__ ({ register __uint32_t __X = (x); \ |
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__asm ("bswap %0" : "+r" (__X)); \ |
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__X; }) |
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#define __bswap64_const(_x) \ |
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(((_x) >> 56) | \ |
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(((_x) >> 40) & (0xffULL << 8)) | \ |
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(((_x) >> 24) & (0xffULL << 16)) | \ |
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(((_x) >> 8) & (0xffULL << 24)) | \ |
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(((_x) << 8) & (0xffULL << 32)) | \ |
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(((_x) << 24) & (0xffULL << 40)) | \ |
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(((_x) << 40) & (0xffULL << 48)) | \ |
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((_x) << 56)) |
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|
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#ifdef __OPTIMIZE__ |
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#define __bswap32_const(_x) \ |
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(((_x) >> 24) | \ |
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(((_x) & (0xff << 16)) >> 8) | \ |
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(((_x) & (0xff << 8)) << 8) | \ |
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((_x) << 24)) |
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|
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#define __byte_swap_int_const(x) \ |
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((((x) & 0xff000000) >> 24) | \ |
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(((x) & 0x00ff0000) >> 8) | \ |
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(((x) & 0x0000ff00) << 8) | \ |
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(((x) & 0x000000ff) << 24)) |
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#define __byte_swap_int(x) (__builtin_constant_p(x) ? \ |
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__byte_swap_int_const(x) : __byte_swap_int_var(x)) |
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#define __bswap16_const(_x) (__uint16_t)((_x) << 8 | (_x) >> 8) |
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|
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– |
#else /* __OPTIMIZE__ */ |
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– |
|
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#define __byte_swap_int(x) __byte_swap_int_var(x) |
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– |
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#endif /* __OPTIMIZE__ */ |
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– |
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static __inline __uint64_t |
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__bswap64(__uint64_t _x) |
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__bswap64_var(__uint64_t __x) |
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{ |
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|
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return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | |
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((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | |
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((_x << 24) & ((__uint64_t)0xff << 40)) | |
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((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); |
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return __bswap64_const(__x); |
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} |
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+ |
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static __inline __uint32_t |
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__bswap32(__uint32_t _x) |
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__bswap32_var(__uint32_t _x) |
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{ |
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return (__byte_swap_int(_x)); |
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__asm ("bswap %0" : "+r" (_x)); |
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return (_x); |
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} |
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static __inline __uint16_t |
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__bswap16(__uint16_t _x) |
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__bswap16_var(__uint16_t _x) |
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{ |
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return (_x << 8 | _x >> 8); |
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|
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return (__bswap16_const(_x)); |
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} |
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+ |
|
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#define __bswap64(_x) \ |
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(__builtin_constant_p(_x) ? \ |
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__bswap64_const((__uint64_t)(_x)) : __bswap64_var(_x)) |
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|
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#define __bswap32(_x) \ |
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(__builtin_constant_p(_x) ? \ |
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__bswap32_const((__uint32_t)(_x)) : __bswap32_var(_x)) |
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|
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#define __bswap16(_x) \ |
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((__uint16_t)(__builtin_constant_p(_x) ? \ |
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__bswap16_const((__uint16_t)(_x)) : __bswap16_var(_x))) |
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|
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#define __htonl(x) __bswap32(x) |
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#define __htons(x) __bswap16(x) |
