xref: /freebsd/contrib/llvm-project/compiler-rt/lib/builtins/bswapdi2.c (revision 0b57cec536236d46e3dba9bd041533462f33dbb7)
1*0b57cec5SDimitry Andric //===-- bswapdi2.c - Implement __bswapdi2 ---------------------------------===//
2*0b57cec5SDimitry Andric //
3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information.
5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*0b57cec5SDimitry Andric //
7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===//
8*0b57cec5SDimitry Andric //
9*0b57cec5SDimitry Andric // This file implements __bswapdi2 for the compiler_rt library.
10*0b57cec5SDimitry Andric //
11*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===//
12*0b57cec5SDimitry Andric 
13*0b57cec5SDimitry Andric #include "int_lib.h"
14*0b57cec5SDimitry Andric 
__bswapdi2(uint64_t u)15*0b57cec5SDimitry Andric COMPILER_RT_ABI uint64_t __bswapdi2(uint64_t u) {
16*0b57cec5SDimitry Andric   return (
17*0b57cec5SDimitry Andric       (((u)&0xff00000000000000ULL) >> 56) |
18*0b57cec5SDimitry Andric       (((u)&0x00ff000000000000ULL) >> 40) |
19*0b57cec5SDimitry Andric       (((u)&0x0000ff0000000000ULL) >> 24) |
20*0b57cec5SDimitry Andric       (((u)&0x000000ff00000000ULL) >> 8)  |
21*0b57cec5SDimitry Andric       (((u)&0x00000000ff000000ULL) << 8)  |
22*0b57cec5SDimitry Andric       (((u)&0x0000000000ff0000ULL) << 24) |
23*0b57cec5SDimitry Andric       (((u)&0x000000000000ff00ULL) << 40) |
24*0b57cec5SDimitry Andric       (((u)&0x00000000000000ffULL) << 56));
25*0b57cec5SDimitry Andric }
26