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git.proxmox.com Git - mirror_edk2.git/blob - StdLib/LibC/Main/bswap64.c
1 /* $NetBSD: bswap64.c,v 1.1 2005/12/20 19:28:51 christos Exp $ */
4 * Written by Manuel Bouyer <bouyer@NetBSD.org>.
8 //#include <sys/cdefs.h>
9 //#if defined(LIBC_SCCS) && !defined(lint)
10 //__RCSID("$NetBSD: bswap64.c,v 1.1 2005/12/20 19:28:51 christos Exp $");
11 //#endif /* LIBC_SCCS and not lint */
13 //#include <sys/types.h>
14 //#include <machine/bswap.h>
23 * Assume we have wide enough registers to do it without touching
26 return ( (x
<< 56) & 0xff00000000000000UL
) |
27 ( (x
<< 40) & 0x00ff000000000000UL
) |
28 ( (x
<< 24) & 0x0000ff0000000000UL
) |
29 ( (x
<< 8) & 0x000000ff00000000UL
) |
30 ( (x
>> 8) & 0x00000000ff000000UL
) |
31 ( (x
>> 24) & 0x0000000000ff0000UL
) |
32 ( (x
>> 40) & 0x000000000000ff00UL
) |
33 ( (x
>> 56) & 0x00000000000000ffUL
);
36 * Split the operation in two 32bit steps.
40 th
= bswap32((u_int32_t
)(x
& 0x00000000ffffffffULL
));
41 tl
= bswap32((u_int32_t
)((x
>> 32) & 0x00000000ffffffffULL
));
42 return ((u_int64_t
)th
<< 32) | tl
;