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[FreeBSD/FreeBSD.git] / contrib / compiler-rt / lib / builtins / bswapdi2.c
1 /* ===-- bswapdi2.c - Implement __bswapdi2 ---------------------------------===
2  *
3  *               The LLVM Compiler Infrastructure
4  *
5  * This file is dual licensed under the MIT and the University of Illinois Open
6  * Source Licenses. See LICENSE.TXT for details.
7  *
8  * ===----------------------------------------------------------------------===
9  *
10  * This file implements __bswapdi2 for the compiler_rt library.
11  *
12  * ===----------------------------------------------------------------------===
13  */
14
15 #include "int_lib.h"
16
17 COMPILER_RT_ABI uint64_t __bswapdi2(uint64_t u) {
18   return (
19       (((u)&0xff00000000000000ULL) >> 56) |
20       (((u)&0x00ff000000000000ULL) >> 40) |
21       (((u)&0x0000ff0000000000ULL) >> 24) |
22       (((u)&0x000000ff00000000ULL) >> 8)  |
23       (((u)&0x00000000ff000000ULL) << 8)  |
24       (((u)&0x0000000000ff0000ULL) << 24) |
25       (((u)&0x000000000000ff00ULL) << 40) |
26       (((u)&0x00000000000000ffULL) << 56));
27 }