mirror of https://github.com/diegocr/libnix.git
49 lines
911 B
C
49 lines
911 B
C
#if 0
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/* $NetBSD: bswap32.c,v 1.3 2003/12/04 13:57:31 keihan Exp $ */
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/*
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* Written by Manuel Bouyer <bouyer@NetBSD.org>.
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* Public domain.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: bswap32.c,v 1.3 2003/12/04 13:57:31 keihan Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#if 0
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#include <machine/bswap.h>
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#undef bswap32
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u_int32_t
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bswap32(x)
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u_int32_t x;
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{
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return ((x << 24) & 0xff000000 ) |
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((x << 8) & 0x00ff0000 ) |
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((x >> 8) & 0x0000ff00 ) |
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((x >> 24) & 0x000000ff );
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}
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#else
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#undef bswap32
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u_int32_t bswap32(u_int32_t var)
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{
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__asm__ __volatile (
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"rorw #8, %0; swap %0; rorw #8, %0" : "=d" (var) : "0" (var));
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return (var);
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}
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#endif
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#else
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asm("\n\
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.text; .even; .globl _bswap32 ; .type _bswap32 ,@function; _bswap32 :\n\
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movl %sp@(4),%d0\n\
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rolw #8,%d0\n\
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swap %d0\n\
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rolw #8,%d0\n\
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rts\n\
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");
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#endif
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